KR102033768B1 - Air conditioning system for commercial vehicle and control method thereof - Google Patents

Abstract

The present invention relates to a cooling and cooling system for a commercial vehicle that applies a mechanical compressor and an electric compressor to a commercial vehicle for cooling and heating according to a driving state of the vehicle, and a control method thereof. The compressor is driven in conjunction with an engine to compress, condense, expand, and evaporate a refrigerant. A cooling unit configured to cool the inside of a cab of a commercial vehicle, an electric compressor disposed in parallel with a mechanical compressor provided in the cooling unit, the mechanical compressor based on a driving state of a vehicle, a battery state, and an engine load factor. And a control unit for controlling the driving of the electric compressor, an auxiliary heater for heating the bed, and an auxiliary heater control module for driving the auxiliary heater to heat the bed in the cold state of the vehicle and the dead state through communication with the control unit. The engine is driven by a mechanical compressor and an electric compressor. Cool the inside of the cab selectively according to the condition, battery condition, and engine load rate.In conjunction with the auxiliary heater, the auxiliary heater can be heated by operating the auxiliary heater until the heating device rises to the coolant temperature that can be normally heated during cold start. Can be.

Description

Air-conditioning system for commercial vehicles and its control method {AIR CONDITIONING SYSTEM FOR COMMERCIAL VEHICLE AND CONTROL METHOD THEREOF}

The present invention relates to a cooling system for a commercial vehicle and a control method thereof, and more particularly, to a cooling system for a commercial vehicle for heating and cooling an interior of a cap by selectively driving an engine driven compressor and an electric compressor according to whether a commercial vehicle is driven or not, and a control method thereof. It is about.

In general, as the vehicle is parked indoors or outdoors for a long time in a non-driving state, the operation of the air conditioner or the heater and the air circulation system is operated in conjunction with the driving of the main engine of the vehicle.

Here, as the air conditioner is operated by receiving power from the engine through the belt, the air conditioner cannot be driven in the non-moving state of the engine.

In order to solve this problem, in addition to the main engine, a commercial engine for cooling and heating is applied to the commercial vehicle separately.

Accordingly, the air conditioner operates by receiving power from the engine for cooling and heating, and the heater device heats the vehicle indoor air by using heat generated by the engine while the engine for cooling and heating is driven.

As such, due to the noise generated when the air conditioner or the heater is operated in accordance with the engine for cooling and heating, it is difficult for the driver to rest more comfortably and easily inside the vehicle, and the smoke generated during the engine for cooling and heating is generated. There is a problem that occurs due to environmental pollution.

In addition, due to the weight of the engine for heating and cooling, not only the task of installing the engine for heating and cooling on the car is difficult, there is a problem that the fuel economy of the vehicle due to the driving is lowered.

That is, when operating a heating and cooling system while driving the vehicle, the driving force of the belt typically generates about 14 kW of energy loss, thereby lowering the fuel efficiency of the vehicle.

In order to solve such a problem, the present applicant has disclosed and patented a non-copper heating and cooling device technology in Patent Document 1 described below.

In particular, as commercial vehicles and special vehicles frequently drive long distances, city-floor heating and cooling systems are indispensable for the convenience of drivers.

Patent document 1 is provided on the other surface of the thermoelectric element module, the first heat sink provided on one surface of the thermoelectric element module, the blowing fan for discharging the indoor air or external air into the room in heat exchanged state with the first heat sink Including a second heat sink to be provided in the interior unit provided inside the cap of the vehicle and the outside of the cap of the vehicle is a radiator for receiving heat from the second heat sink to exchange heat with the outside air, the outside air is introduced into the heat exchange with the radiator Disclosed is a configuration of a non-smoking heating and cooling device for a vehicle including an outdoor unit configured of a blowing fan to be discharged to the outside.

Republic of Korea Patent Publication No. 10-2011-0002541 (published January 10, 2011) Republic of Korea Patent Publication No. 10-2014-0083354 (published 4 July 2014) Republic of Korea Patent Registration No. 10-1427920 (August 8, 2014 announcement)

However, the air-heated heater applied to the city-based air-conditioning apparatus according to the prior art including Patent Document 1 has a function of heating only the air inside the cap in the stopped state of the engine in winter, so it is unnecessary in the summer, and the cap of the commercial vehicle There was a problem in that a separate heating wire to be installed in the bed to be heated.

In addition, the air-heated heater has a problem in that the room is dried by heating the indoor air inside the cap, causing inconvenience in breathing of the driver in winter, and disturbing the driver's sleep due to noise generated during the heating operation.

In addition, if a heating wire is installed on the bed and heated, the risk of fire due to an overheating or short circuit during heating operation increases, and the battery life is adversely affected by excessive consumption of the vehicle battery, and the driver is exposed to electromagnetic waves. Accordingly, there was a problem that prevents the driver from recovering from fatigue.

In addition, the musi-dong air-conditioning apparatus according to the prior art has a problem that it is impossible to cool for a long time due to the discharge characteristic of the battery is impossible to discharge more than the discharge end voltage, and the life of the battery sharply reduced.

On the other hand, Patent Literature 2 and Patent Literature 3 describe a configuration in which a motor-driven compressor driven by battery power is simultaneously applied together with a mechanical compressor interlocked with an engine.

However, Patent Literature 2 and Patent Literature 3 are applied to an electric vehicle or a hybrid vehicle having an idle stop function, and there is a problem that it is difficult to apply to a general commercial vehicle.

In addition, the musi-dong air-conditioning device according to the prior art may be applied to increase the performance of the electric compressor by applying a DC-DC converter for the purpose of boosting, driving the electric compressor in conjunction with the air conditioning system of the vehicle to perform the mute copper cooling For heating in cold state, additional independent auxiliary heater must be installed and operated.

As described above, the musi-dong air-conditioning device according to the prior art applies a DC-DC converter having a large volume of products and a large internal device, and is susceptible to vibrations by converting from 24V to 110V or 240V using a high current consumption. And, there was a problem that causes a quality problem because of too much heat.

In addition, the musi-dong air-conditioning device according to the prior art has implemented a cooling system applying an electric compressor to reduce the starting or fuel economy, the heating system is not interlocked.

For this reason, the musi-dong air-conditioning device according to the prior art in the musi-dong state, the customer moves directly from the bed provided on the rear of the cap seat to the operation installation installed on the dashboard to operate a separate auxiliary heater, or for heating during the initial cold run There was a hassle to manipulate whether or not the auxiliary heater was running.

Therefore, a mechanical compressor operating in conjunction with an engine and an electric compressor operated by battery power are applied to a commercial vehicle at the same time, and the driving of each compressor is selectively controlled according to the battery state and the engine load ratio when the vehicle is driven. In this situation, it is necessary to develop a technology capable of efficiently heating and cooling by operating an electric compressor.

An object of the present invention is to solve the problems as described above, by applying a mechanical compressor and an electric compressor to the commercial vehicle to provide a cooling and heating system for a commercial vehicle to perform air conditioning according to the running state of the vehicle and a control method thereof will be.

Another object of the present invention is to control the operation of the mechanical compressor and the electric compressor according to the battery condition and the engine load factor when the vehicle is running, and operating the electric compressor in the non-moving state to increase the heating and cooling efficiency and fuel economy system for commercial vehicles And a control method thereof.

Still another object of the present invention is to provide an air conditioning heating system for a commercial vehicle and a control method thereof capable of directly driving an electric compressor with battery power of a vehicle and minimizing vibration and heat generation.

Another object of the present invention is to heat the vehicle interior by driving the auxiliary heater in the engine cold state and the engine start state during the initial start of the engine in winter, and when switched to the hot air heating system for commercial vehicles using the heat of the engine coolant and It is to provide a control method thereof.

Still another object of the present invention is to provide a heating and cooling system for a commercial vehicle and a control method thereof, by which a user can directly operate a cooling and heating device on a bed.

In order to achieve the object as described above, the air conditioning system for a commercial vehicle according to the present invention comprises a refrigeration cycle that is driven in conjunction with the engine to compress, condense, expand and evaporate the refrigerant to cool the inside of the cap of the commercial vehicle, An electric compressor disposed in parallel with a mechanical compressor provided in the air conditioner, a control unit controlling driving of the mechanical compressor and the electric compressor based on a running state of a vehicle, a battery state, and an engine load ratio, an auxiliary heater for heating a bed; And an auxiliary heater control module configured to drive the auxiliary heater to heat the bed in the initial cold state of the vehicle and in the dead state through communication with the control unit, wherein the controller is configured to preset the rotation speed of the engine in a cooling mode setting state. If the rotation speed is exceeded, it is determined that the vehicle is running and enters the driving mode. In this case, the mechanical compressor or the motor-driven compressor is selectively driven to cool the engine, and when the engine speed is less than or equal to the set speed, it is determined that the engine is in the dead state and the engine is driven into the bypass mode to drive the motor-driven compressor to the cooling operation. It is characterized by controlling.

In order to achieve the object as described above, the air conditioning system for a commercial vehicle according to the present invention is driven in conjunction with the engine to form a refrigeration cycle for compressing, condensing, expanding and evaporating the refrigerant to cool the inside of the cap of the commercial vehicle And an electric compressor disposed in parallel with the mechanical compressor provided in the air conditioner, a controller for controlling the driving of the mechanical compressor and the electric compressor based on the running state of the vehicle, the state of the battery and the engine load factor, and an auxiliary heater for heating a bed. And an auxiliary heater control module provided at one side of the bed and driving the auxiliary heater to heat the bed in the initial cold state of the vehicle and in the dead state through bidirectional communication with the control unit. Is connected to enable bidirectional communication, the auxiliary heater control module is couch The heating temperature and cooling temperature of the bed set through the prepared operation unit are transmitted to the control unit, and the control unit transmits the cooling temperature and the bed heating temperature set by the user's operation to the protection heater control module. .

In addition, in order to achieve the object as described above, the control method of the commercial vehicle air conditioning system according to the present invention (a) when the ON operation command of the air conditioning system for commercial vehicles is input through the operation unit, to check whether the cooling mode setting state Step, (b) checking whether the engine speed exceeds the preset rotation speed when the inspection result of step (a) is in the cooling mode setting state, and (c) the inspection speed of the inspection result engine in step (b) When the set rotation speed is exceeded, it is determined that the vehicle is in a driving state, the vehicle enters the driving mode, and the mechanical compressor driven by the engine or the electric compressor driven by battery power is driven based on the driving state of the vehicle and the engine load factor. Selectively driving to cool the cab internal space of the commercial vehicle; and (d) the engine speed is less than or equal to the set rotation speed as a result of the inspection of step (b). If it is determined that the engine is in the dead state, the vehicle enters the dead mode, enters the day mode or the night mode based on the solar load received from the solar sensor of the vehicle, and drives the electric compressor based on the state of the battery. Cooling the inner space of the cap; (e) if the heating mode is set as a result of the inspection in the step (a), checking whether the engine speed exceeds the set rotation speed, and (f) the step (e) If the engine speed exceeds the predetermined rotation speed, the engine determines that the vehicle is in the driving state, and enters the driving mode. The heating operation is performed by driving an auxiliary heater that heats the couch based on the engine load rate and the coolant temperature of the vehicle. And (g) if the engine speed is equal to or less than the set speed as the inspection result of step (e), determine that the engine is in the dead state, and enter the bypass mode. To on the basis of the temperature difference between the indoor temperature set ondogwa amount of driving the auxiliary heater it is characterized in that it comprises the step of heating operation.

As described above, according to the air-conditioning system for a commercial vehicle and a control method thereof according to the present invention, there is provided an electric compressor driven directly by battery power without a mechanical compressor and a DC-DC converter, the engine driving state, the battery state, the engine The effect that the inside of the cap can be cooled by using selectively according to the load ratio is obtained.

According to the present invention, when the cold state and the vehicle indoor temperature during driving are lower than the preset reference temperature, by driving the electric compressor to cool the inside of the cap, the effect can be increased and the fuel economy of the vehicle can be improved. .

In addition, according to the present invention, in connection with the auxiliary heater installed in the bed, by heating the auxiliary heater until the heating device rises to the coolant temperature that can normally be heated during the initial cold start of the engine, the user's satisfaction and convenience is increased The effect that can be obtained is obtained.

In addition, according to the present invention, by receiving the sun load from the solar sensor when cooling in the state of cold state divided into day mode and night mode to increase the use time at a limited charge capacity of the battery through the room temperature maintenance conditions in the night mode, The effect that the power use efficiency can be improved is obtained.

Moreover, according to this invention, the effect that a customer convenience can be increased by enabling a user to operate the drive of an air-conditioning apparatus on a bed in a state of high dynamics is obtained.

1 is a block diagram of a commercial vehicle air conditioning system and a commercial vehicle to which it is applied according to a preferred embodiment of the present invention,
2 to 4 is a flow chart illustrating a step-by-step control method of a heating and cooling system for a commercial vehicle according to an embodiment of the present invention.

Hereinafter, a cooling system and a control method for a commercial vehicle according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is composed of a dual electric compressor and a mechanical compressor, and driven directly by supplying a battery power of about 24V supplied from the vehicle's battery directly without applying a DC-DC converter, and driving two refrigerants compressed in the condenser By selectively transmitting to any one of the compressor to cool the inside of the cap of the commercial vehicle, it can be heated in conjunction with the auxiliary heater.

1 is a block diagram of a commercial vehicle air conditioning system and a commercial vehicle to which it is applied according to a preferred embodiment of the present invention.

The air conditioning system for a commercial vehicle according to the preferred embodiment of the present invention, as shown in FIG. 1, is driven in conjunction with an engine (not shown) to form a refrigeration cycle for compressing, condensing, expanding, and evaporating a refrigerant cap of a commercial vehicle. Based on the air conditioner 20 that cools the inside, the electric compressor 30 disposed in parallel with the mechanical compressor 21 provided in the air conditioner 20 and the running state of the vehicle, the state of the battery 50 and the engine load rate And a controller 40 for controlling the driving of the mechanical compressor 21 and the electric compressor 30.

And the air conditioning system for a commercial vehicle according to a preferred embodiment of the present invention auxiliary heater 60 to heat the bed through the communication with the auxiliary heater 60 and the control unit 40 and the auxiliary heater 60 to heat the bed in the cold state and the dead state during the initial start of the vehicle It further comprises an auxiliary heater control module 61 for driving.

In addition, the commercial vehicle heating and cooling system 10 according to a preferred embodiment of the present invention, the controller 31 for controlling the drive of the electric compressor 30 in accordance with the control signal of the control unit 40, the heating and cooling system 10 for commercial vehicles 10 The control unit 41 may further include an operation unit 41 receiving an operation command and a communication unit 42 communicating with the smart device 70 to control the operation of the control unit.

The air conditioner 20 is driven by receiving the output of the engine through a belt and condensed to condense the refrigerant compressed by the mechanical compressor 21, the mechanical compressor 21, or the electric compressor 30 to compress the refrigerant in a gaseous state. (22), an expansion valve (23) for expanding the condensed liquid refrigerant and an evaporator (24) for evaporating the expanded refrigerant through heat exchange with air.

Here, a first connection member 25 is installed between the evaporator 24, the mechanical compressor 21, and the electric compressor 30 to supply the evaporated refrigerant to the mechanical compressor 21 and the electric compressor 30. A second connecting member 26 is installed between the mechanical compressor 21, the electric compressor 30, and the condenser to supply the refrigerant compressed by the mechanical compressor 21 and the electric compressor 30 to the condenser 30. Can be.

In addition, a check valve 27 may be provided between the electric compressor 30 and the second connection member 26 to prevent the reverse flow by flowing the refrigerant compressed by the electric compressor 30 in only one direction toward the condenser 22. Can be.

The first and second connection members 25 and 26 may be provided as T-type connection joint members, respectively.

Of course, the present invention is not necessarily limited thereto, and may be changed to apply the electronic three-way valve to the first and second connection members to open and close according to the control signal of the controller.

The battery 50 applied to a commercial vehicle receives and charges power generated by a generator (not shown) while driving a vehicle, and discharges a battery power having a voltage level of about 24V.

The battery 50 may be provided with a battery sensor 51 for detecting the voltage level of the battery power source and the charging state of the battery 50.

The battery sensor 50 may be provided as an intelligent battery sensor that measures a voltage, current, and temperature value of a battery power and provides a charging state, a health state, and a functional state of the battery.

The detection signal of the battery detection sensor 51 is transmitted to the controller 31 driving the motor-driven compressor 30, and the controller 40 may receive the detection signal through communication with the controller 31.

The mechanical compressor 21 is driven by receiving the output of the engine through the belt, is connected to the control unit 40 via a general hardwire so as to be communicable, and is driven on / off according to a control signal of the control unit 40. Can be.

The motor-driven compressor 30 is driven by being directly supplied with battery power, and the controller 31 may communicate with the controller 40 through CAN communication of the vehicle.

Thus, the controller 31 controls whether the motor (not shown) and the driving speed of the motor provided in the electric compressor 30 are driven according to the control signal of the controller 40, and controls the driving state and the speed information of the motor. Can be fed back.

As the mechanical compressor 21 and the motorized compressor 30 are selectively driven, the controller 40 may be any one to be driven when the first and second connection members 25 and 26 are provided as electronic three-way valves. The control signal for controlling the operation of the first and second connecting members (25, 26) to supply the refrigerant to the compressor of the compressor, or the compressor compressed in the driven compressor to the condenser 22 may be generated.

And the control unit 40 generates a control signal for controlling the rotational speed of the motor provided in the electric compressor (30).

The control unit 40 may be provided as an integrated controller for integrally controlling the driving of the cooling device 20 and the heating device applied to the vehicle.

The integrated controller automatically adjusts the inflow direction of the blowing direction, the blowing amount, the room temperature and the outside temperature in a vehicle to which a full automatic temperature control (FATC) is applied to maintain a comfortable interior space regardless of the external environment. Can be controlled.

That is, the controller 40 may control the driving of the fan motor (not shown) provided in the condenser 22, and control the air volume by controlling the driving of the blower motor (not shown) provided in the evaporator 24. .

Here, the control unit 40 receives refrigerant pressure information from an automatic pressure transducer provided in the condenser 22 instead of the dual pressure switch, and controls the on / off of the fan motor and the on / off of the blower motor. can do.

The control unit 40 may communicate with a main control unit (not shown) of the vehicle through CAN communication, and receive a detection signal of each detection sensor (not shown) provided in the vehicle.

For example, the vehicle has an ambient temperature sensor that senses the outside air temperature, an intake air temperature sensor that senses the temperature of the intake air drawn into the vehicle, an intake airflow sensor, and a sun sensor. Various sensors may be provided, such as a water temperature sensor for detecting a coolant temperature, a rotation speed sensor for detecting an engine speed, and a throttle sensor for detecting an opening amount of a throttle.

Thus, the control unit 40 selectively drives the mechanical compressor 21 and the electric compressor 30 according to the driving state of the vehicle, the state of the battery 50 and the engine load ratio based on the detection signal transmitted through each detection sensor. The vehicle may be controlled to cool the inside of the vehicle, that is, the inside of the cap.

That is, when the engine speed exceeds the preset set speed, the controller 40 determines that the vehicle is in a running state, enters the travel mode, and selectively drives the mechanical compressor 21 or the electric compressor 30 to Can be controlled to cool.

For example, the controller 40 may enter the driving mode when the rpm of the engine exceeds the '380' set as the set rotation speed in the cooling mode setting state, and enter the bypass mode when the speed is less than '380'. .

When the controller 40 enters the driving mode, the controller 40 controls the driving of the mechanical compressor 21 or the electric compressor 30 according to the difference between the engine load factor, the state of the battery 40, the set temperature, and the current room temperature of the vehicle. Can be controlled to cool.

On the other hand, if the engine speed is less than the set speed, the controller 40 determines that the engine is in the dead state, and enters the dead mode and operates the electric compressor 30 according to the state of charge of the battery 50 and the engine load ratio. It can be controlled to drive and cool.

Here, the control unit 40 may receive a sun load transmitted from the solar sensor of the vehicle and enter the day mode or the night mode based on the received sun load to control the driving of the electric compressor 30. have.

For example, the controller 40 enters the day mode when the received solar load is greater than a set value, for example, '0', enters the night mode when the solar load is '0', and the battery supplied from the battery 50. According to the state, that is, the voltage level of the battery power source and the state of charge (SoC) of the battery 50, the electric compressor 30 may be controlled to be driven and cooled.

The controller 40 communicates with the auxiliary heater control module 61 when the cooling mode is turned off, that is, in the heating mode setting state, and the heating device or the auxiliary heater of the vehicle according to the difference between the coolant temperature and the set temperature and the current room temperature of the vehicle ( 60 can be driven to control heating.

The auxiliary heater control module 61 receives the temperature of the bed according to a user's operation input through an operation unit (not shown), transmits the set temperature to the control unit 40, and receives the auxiliary heater (from the control unit 40). The auxiliary heater 60 may be driven by receiving a control signal for controlling driving of the 60.

To this end, the auxiliary heater control module 61 and the control unit 40 may be connected to the bi-directional communication in a CAN communication method.

The operation unit with the auxiliary heater control module 61 may be provided on the bed so that the user can easily operate.

The operation unit 41 may include a plurality of switches or buttons for turning on or off the air conditioning system 10, setting an indoor temperature inside the cap, and setting a cooling mode or a heating mode.

The operation unit 41 is installed in the center fascia, the instrument panel or the operation unit 41 may be provided with a plurality of warning lights for guiding the operating state of the air conditioning system 10 and the charging of the battery 50.

As described above, according to the present invention, the controller and the auxiliary heater control module are connected to each other to enable bidirectional communication, so that the driving of the auxiliary heater can be controlled using the control unit in the state of non-movement, and the auxiliary heater control module is used as well. The drive of the cooling device can be controlled.

The communication unit 42 may communicate with the smart device 70 in which a dedicated application for operating the air conditioning system 10 for a commercial vehicle is installed.

The smart device 70 is provided as a personal portable terminal having a communication function, such as a smart phone, a tablet PC, a laptop, the dedicated application performs a communication with the communication unit 42 of the vehicle through the authentication process of the driver and the user It is possible to operate the air conditioning system 10 for a commercial vehicle at a place other than the driver's seat, for example, at a bed provided at the rear of the cap seat.

Next, with reference to Figures 2 to 4 will be described in detail a control method of a heating system for a commercial vehicle according to a preferred embodiment of the present invention.

2 to 4 is a flow chart for explaining a step-by-step control method of the heating and cooling system for a commercial vehicle according to an embodiment of the present invention.

FIG. 2 illustrates a process of cooling in a driving mode in a state in which a cooling mode is set, FIG. 3 illustrates a process of cooling in a fireless mode, and FIG. 4 illustrates a process of heating in a state in which a heating mode is set. have.

In operation S10 of FIG. 2, when an on operation signal is input to drive the air conditioning system 10 through the operation unit 41, the controller 40 checks whether the cooling mode is set by a switch or button operation provided in the operation unit. (S12).

If the inspection result of step S12 is the off state of the cooling mode, that is, the heating mode is set, the control unit 40 proceeds to step S70 of FIG.

On the other hand, if the state is set to the cooling mode as a result of the check in step S12, the control unit 40 determines the driving state of the vehicle using the detection signal of the engine speed sensor (S14).

That is, when the detected engine speed exceeds the preset set speed, the controller 40 determines the driving state of the vehicle, enters the driving mode, and proceeds to step S16 below.

The set speed may be set to about 350 to 400rpm.

Of course, the present invention is not necessarily limited thereto, and the set rotation speed may be variously changed to about 0 to 800 rpm.

On the other hand, the controller 40 determines that the engine is in the dead state when the detected engine speed is less than or equal to the set speed, and enters the dead mode and proceeds to step S40 of FIG. 3.

That is, in the present invention, even when the ignition key is turned off, when the on-operation signal is input through the operation unit, the control unit may enter a deadlock mode to drive a cooling and heating system to cool the inside of a cab of a commercial vehicle.

In operation S16, the controller 40 drives the mechanical compressor 21 and exchanges heat with the refrigerant through a refrigeration cycle using the condenser 22, the expansion valve 23, and the evaporator 24 provided in the cooling device 20. The air cooled through the supply is controlled to cool by supplying the inside of the cap of the commercial vehicle.

In the process of cooling in the driving mode as described above, the control unit 40 may control to selectively drive the mechanical compressor 21 and the electric compressor 30 according to the engine load factor and the set temperature and the temperature difference between the room temperature of the current vehicle. Can be.

Here, the engine load factor may be calculated using the maximum amount of air and the amount of air sucked through the throttle.

In detail, in step S18, the controller 40 checks whether the engine load maintains the preset first load rate, for example, 10% or more for a first preset time, for example, 10 seconds.

When the engine load maintains the first load factor or more as a result of the inspection in step S18, the controller 40 has a temperature difference ΔT less than the preset first set temperature, and the state of charge of the battery 45, that is, the charge rate is set in advance. 1 check whether the filling rate is exceeded (S20).

The temperature difference refers to a difference between a set temperature set to cool the inside of the cap at a room temperature within the current cap, and the first set temperature may be set to about 1 ° C., and the first filling rate may be set to about 80%. .

When the temperature difference is less than the first set temperature and the battery charge rate exceeds the first charge rate in step S20, the controller 40 drives the motor-driven compressor 30 and guides the driving state of the motor-driven compressor 30 in step S22. Control to turn on the warning light (S24).

At this time, the refrigerant evaporated in the evaporator 24 is supplied to the motor-driven compressor 30 through the first connection member 25, and the refrigerant compressed in the motor-driven compressor 30 is condensed through the second connection member 26. 22). Here, the flow of the refrigerant is controlled by a check valve provided between the electric compressor 30 and the second connecting member 26.

On the other hand, when the test result of the engine load is less than the first load ratio in step S18 or the test result temperature difference is greater than the first set temperature in step S20, the control unit 40 proceeds to step S16 and controls to repeat the subsequent steps.

In step S26, the controller 40 checks whether the engine load is less than the first load factor for a second preset time, for example, 60 seconds.

When the engine load factor is maintained below the first load factor as a result of the test at step S26, the controller 40 checks whether the temperature difference ΔT exceeds the second preset temperature (S28).

The second set temperature may be set to about 3 ° C higher than the first set temperature.

If the result of the test in step S26 is greater than or equal to the first load factor or the result of the test result difference in step S28 is less than or equal to the second set temperature, the controller 40 controls to repeat steps S22 to S28.

The first and second set temperatures may be set by the user using the smart device 70 through communication with the operation unit provided in the operation unit 41, the auxiliary heater control module 61, or the communication unit 41. have.

On the other hand, if the result of the check in step S28 exceeds the second set temperature, in step S30 the control unit 40 checks whether the off operation command is input to stop the driving of the cooling and heating system 10 through the operation unit 41 and The control is performed to repeat steps S14 to S30 until the off operation command is input.

If the inspection result off operation command of step S30 is input, the control unit 40 stops driving of the air conditioning system 10 for commercial vehicles and ends.

On the other hand, in the mute operation mode, the control unit 40 enters the day mode or the night mode according to the sun load, the state of the battery 50, that is, the voltage level of the battery power discharged from the battery 50 (hereinafter 'battery voltage' Driving of the motor-driven compressor 30 according to the state of charge of the battery 50 and cooling the inside of the cap of the commercial vehicle, or to guide the charging of the battery 50.

In detail, in step S40 of FIG. 3, the control unit 40 receives a detection signal from a solar sensor provided in a vehicle, and the current sun load corresponding to the received detection signal is preset to determine a day mode or a night mode. Check if the setting load is exceeded.

If the current solar load exceeds the set load as a result of the check in step S40, the controller 40 enters the day mode (S42).

For example, the set load may be set to '0'%.

In step S44, the controller 40 checks whether the battery voltage exceeds a first preset voltage, for example, 23.5V, and the state of charge of the battery 50 exceeds a second charge rate, for example, 70%. .

When the battery voltage exceeds the first set voltage and the state of charge of the battery 50 exceeds the second charge rate, the controller 40 drives the motor-driven compressor 30 and the air conditioner 20. In the refrigeration cycle using the condenser 22, the expansion valve 23 and the evaporator 24 is provided to control the cooling by supplying the air cooled through heat exchange with the refrigerant into the cap of the commercial vehicle (S46).

And the control unit 40 controls to turn on the warning light to guide the driving state of the electric compressor (30) (S48).

At this time, the refrigerant evaporated in the evaporator 24 is supplied to the motor-driven compressor 30 through the first connection member 25, and the refrigerant compressed in the motor-driven compressor 30 is condensed through the second connection member 26. 22).

As described above, in the process of performing cooling in the non-active mode, the controller 40 exceeds the preset second set voltage, for example, 22.5 V, to prevent battery damage due to over discharge, and the battery 50 It is checked whether the state of charge exceeds a third charge rate, for example 50%, and the temperature difference is less than the first set temperature (S50).

If the battery voltage exceeds the second set voltage, the state of charge of the battery 50 exceeds the third charge rate, and the temperature difference is less than the first set temperature in step S50, the controller 40 performs steps S46 to S50. Control to repeat.

On the other hand, when the battery voltage is less than the first set voltage or the state of charge of the battery 50 is less than the second charging rate in step S44, and when the battery voltage is less than the second set voltage or the battery 50 is charged as the result of the test in step S50 When the state is equal to or less than the third charge rate or the temperature difference is equal to or greater than the first set temperature, the controller 50 stops driving the electric compressor 30 and controls the warning lamp to light to guide the need for charging of the battery 50. (S52).

On the other hand, if the solar load is less than the set load as a result of the check in step S40, the control unit enters the night mode (S60).

In step S62, the controller 40 checks whether the battery voltage exceeds the first set voltage and the state of charge of the battery 50 exceeds the second charge rate.

As a result of the check in step S62, when the battery voltage exceeds the first set voltage and the state of charge of the battery 50 exceeds the second charge rate, the controller 40 drives the motor-driven compressor 30 and the air conditioner 20. In the refrigeration cycle using the condenser 22, the expansion valve 23 and the evaporator 24 provided in the) is controlled to supply air cooled by heat exchange with the refrigerant into the cap of the commercial vehicle to cool (S64).

At this time, the control unit 40 controls to turn on the warning light to guide the driving state of the electric compressor (30). At this time, the refrigerant evaporated in the evaporator 24 is supplied to the motor-driven compressor 30 through the first connection member 25, and the refrigerant compressed in the motor-driven compressor 30 is condensed through the second connection member 26. 22).

As described above, in the process of performing cooling in the non-active mode, the controller 40 has a battery voltage that exceeds the second set voltage, a state of charge of the battery 50 that exceeds the third charge rate, and a temperature difference is It is checked whether it is less than the first set temperature (S68).

When the battery voltage exceeds the second set voltage, the state of charge of the battery 50 exceeds the third charge rate, and the temperature difference is less than the first set temperature in step S68, the controller 40 performs steps S64 to S68. Control to repeat.

On the other hand, when the battery voltage is less than the first set voltage or the charging state of the battery 50 is equal to or less than the second charge rate, and the inspection result of step S68, the battery voltage is less than or equal to the second set voltage or the battery 50 is charged. If the state is equal to or less than the third charge rate, or the temperature difference is equal to or greater than the first set temperature, the controller 50 proceeds to step S52 to stop the driving of the electric compressor 30 and to warn that the battery 50 needs to be charged. Control to light.

As described above, the controller 40 ends the driving of the motor-driven compressor 30 and then proceeds to step S30 of FIG. 2 to end the driving of the air conditioning system 10 for a commercial vehicle.

On the other hand, if the inspection result of step S12, the cooling mode is turned off, that is, the heating mode is set, the control unit 40 proceeds to step S70 of FIG. 4 and the heating device or auxiliary heater based on the engine speed, cooling water temperature, temperature difference Optionally drive 50 to heat the interior of the cap.

In detail, in step S70 of FIG. 4, the controller 40 determines the driving state of the vehicle using the detection signal of the engine speed sensor.

That is, when the detected engine speed exceeds the set speed, the controller 40 determines the driving state of the vehicle, enters the driving mode, and proceeds to step S72.

On the other hand, the controller 40 determines that the engine is in the dead state when the detected engine speed is less than or equal to the set speed, and enters the dead mode and proceeds to step S80 to be described below.

That is, in the present invention, even when the ignition key is turned off, when the on-operation signal is input through the operation unit, the control unit may enter the bypass mode and drive the air conditioning system to heat the inside of the cap of the commercial vehicle.

In operation S72, the controller 40 determines whether the temperature of the coolant received from the water temperature sensor of the vehicle is lower than a third preset temperature set in advance to determine whether the engine is initially cold, and to drive the auxiliary heater 50 in advance. Check whether the temperature is lower than the fourth set temperature.

The third set temperature may be set to a temperature of the cooling water capable of heating using a heating apparatus. In the present embodiment, the third set temperature may be set to about 30 ° C., and the fourth set temperature may be set to about −15 ° C.

Here, the third and fourth set temperatures may be set by the user using the smart device 70 through communication with the operation unit or the communication unit 41 provided in the auxiliary heater control module 61.

Of course, in the present invention, the driver may set the third and fourth set temperatures using the operation unit provided in the center fascia.

If the result of the test of step S72 is that the coolant temperature is greater than or equal to the third set temperature or the temperature difference is greater than or equal to the fourth set temperature, the controller 40 proceeds to step S78 and controls to stop driving of the auxiliary heater 50.

On the other hand, if the result of the test in step S72 and the cooling water temperature and the temperature difference is less than the third and fourth set temperature, respectively, the control unit 40 generates a control signal to drive the auxiliary heater 50.

Then, the auxiliary heater control module 51 drives the auxiliary heater 51 according to the control signal of the control unit 40, and the auxiliary heater (heating the needle bed to the set temperature input from the user through the operation unit 41) ( The driving of 50 is controlled (S74).

In step S76, the control unit 40 checks whether the coolant temperature is equal to or greater than the third set temperature, and controls to repeatedly perform steps S74 and S76 until the third set temperature or more is reached.

On the other hand, if the result of the test in step S76 is the coolant temperature is greater than or equal to the third set temperature, the control unit 40 stops the driving of the auxiliary heater 50, and controls the heating device to heat the inside of the cap.

As described above, the present invention drives the auxiliary heater during the initial cold of the engine to heat the interior of the cap, thereby heating the interior of the cap until the cooling water temperature rises so that the heating device normally heats the interior of the cap, thereby increasing user satisfaction and convenience. can do.

On the other hand, if it is determined in the neglected state in step S70, the control unit 40 checks whether the temperature difference is less than the fourth set temperature in step S80.

When the temperature difference is greater than or equal to the fourth set temperature as a result of the check in operation S80, the controller 40 generates a control signal to drive the auxiliary heater 50.

Then, the auxiliary heater control module 51 drives the auxiliary heater 500 according to the control signal of the controller 40, and the auxiliary heater 50 to heat the needle bed to the set temperature input from the user through the operation unit 41. (S82).

In step S84, the control unit 40 checks whether the coolant temperature is about -5 ° C or less than the fifth set temperature smaller than the fourth set temperature, and steps S82 and S84 until the temperature falls below the fifth set temperature. Control to repeat.

On the other hand, when the temperature difference is greater than or equal to the fourth set temperature as a result of the inspection in step S80, or when the coolant temperature is greater than or equal to the fifth set temperature as a result of the inspection in step S84, the controller 40 stops driving the auxiliary heater 50.

As described above, the controller 40 ends the driving of the auxiliary heater 50 and then proceeds to step S30 of FIG. 2 and ends the driving of the commercial vehicle heating and cooling system 10.

Through the above process, the present invention provides an electric compressor driven by direct battery power supply without a mechanical compressor and a DC-DC converter, and selectively used according to the engine driving state, the battery state, the engine load rate and the inside of the cap Can be cooled.

In addition, the present invention can increase the convenience and improve the fuel economy of the vehicle by cooling the inside of the cab by driving the electric compressor when the vehicle indoor temperature and the vehicle interior temperature is below the predetermined reference temperature during driving.

In addition, the present invention can increase the user's satisfaction and convenience by driving by heating the auxiliary heater until the heating device rises to the coolant temperature that can be normally heated during cold start of the engine in conjunction with the auxiliary heater installed on the bed. have.

In addition, the present invention receives the sun load from the solar sensor when cooling in the state of cold state divided into day mode and night mode to increase the use time in the limited battery charge capacity through the indoor temperature maintenance conditions in the night mode, power efficiency Can improve.

In addition, the present invention can increase the customer convenience by enabling the user to operate the driving of the air conditioner on the bed in the state of non-moving.

As mentioned above, although the invention made by the present inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

The present invention provides a motor-driven compressor that directly drives the battery power without a mechanical compressor and a DC-DC converter, and selectively uses the engine according to the engine driving state, the battery state, and the engine load rate to cool the inside of the cap, and the auxiliary heater installed on the bed. This technology is applied to the cooling and heating system for a commercial vehicle that heats the interior of the cab during the initial cold start of the engine and in the dead state and its control method technology.

10: cooling system for commercial vehicles
20: air conditioner 21: mechanical compressor
22: condenser 23: expansion valve
24: evaporator 25, 26: first and second connecting members
27: check valve 30: electric compressor
31: controller 32: motor
40: control unit 41: operation unit
42: communication unit 50: battery
51: battery sensor 60: auxiliary heater
61: auxiliary heater control module 70: smart device

Claims (9)

Cooling system that cools the inside of the cab of a commercial vehicle by forming a refrigeration cycle driven in conjunction with the engine to compress, condense, expand and evaporate the refrigerant,
An electric compressor disposed in parallel with the mechanical compressor provided in the air conditioning apparatus;
A control unit for controlling the driving of the mechanical compressor and the electric compressor based on the running state of the vehicle, the state of the battery, and the engine load ratio;
Auxiliary heater to heat the couch,
An auxiliary heater control module for driving the auxiliary heater to heat the bed in the initial cold state of the vehicle and the dead state through communication with the control unit;
Controller for controlling the drive of the electric compressor and
It includes an operation unit for receiving an operation command from the user,
When the engine speed exceeds the preset speed in the cooling mode setting state, the control unit determines that the vehicle is in a driving state, enters the driving mode, selectively drives the mechanical compressor or the electric compressor, and cools and operates.
When the rotation speed of the engine is equal to or less than the set rotation speed, it is determined that the engine is in a dead state and enters into the dead mode, and the electric compressor is driven to cool and operate.
Communicates with the main control of the vehicle and each sensor through CAN communication.
When the engine load in the driving mode during the cooling operation exceeds the first load ratio during the first preset time and the temperature difference between the room temperature and the preset temperature of the current vehicle is less than or equal to the preset first preset temperature, the motor-driven compressor is cooled by cooling. Control the
If the engine load is less than the first load rate during the second set time set longer than the first set time and the temperature difference exceeds the second set temperature set greater than the first set temperature, and controls to drive the mechanical compressor again,
The electric compressor is a heating and cooling system for a commercial vehicle, characterized in that driven by receiving battery power directly from the battery. Cooling system that cools the inside of the cab of a commercial vehicle by forming a refrigeration cycle driven in conjunction with the engine to compress, condense, expand and evaporate the refrigerant,
An electric compressor disposed in parallel with the mechanical compressor provided in the air conditioning apparatus;
A control unit for controlling the driving of the mechanical compressor and the electric compressor based on the running state of the vehicle, the state of the battery, and the engine load ratio;
Auxiliary heater to heat the couch,
An auxiliary heater control module provided at one side of the bed and driving the auxiliary heater to heat the bed in the initial cold state of the vehicle and in the dead state through bidirectional communication with the control unit;
Controller for controlling the drive of the electric compressor and
It includes an operation unit for receiving an operation command from the user,
The auxiliary heater control module and the control unit is connected to enable bidirectional communication,
The auxiliary heater control module transmits the heating temperature and cooling temperature of the bed set through the operation unit provided on the bed to the controller,
The control unit transmits the cooling temperature and the heating temperature of the needle bed set by the user's operation to the auxiliary heater control module,
Communicates with the main control of the vehicle and each sensor through CAN communication.
When the engine load in the driving mode during the cooling operation exceeds the first load ratio during the first preset time and the temperature difference between the room temperature of the current vehicle and the preset temperature is less than or equal to the preset first preset temperature, the motor-driven compressor is cooled by cooling. Control the
If the engine load is less than the first load rate during the second set time set longer than the first set time and the temperature difference exceeds the second set temperature set greater than the first set temperature, and controls to drive the mechanical compressor again,
The electric compressor is a heating and cooling system for a commercial vehicle, characterized in that driven by receiving battery power directly from the battery. delete The method according to claim 1 or 2,
Between the evaporator of the cooling device and the mechanical compressor and the electric compressor is provided a first connecting member for connecting the evaporated refrigerant to the mechanical compressor and the electric compressor,
Between the mechanical compressor and the electric compressor and the condenser of the cooling device is provided a second connecting member for connecting the refrigerant compressed by the mechanical compressor and the electric compressor to the condenser,
Between the electric compressor and the second connection member is provided with a check valve for controlling the flow of refrigerant by flowing the compressed refrigerant in only one direction through the condenser,
The control unit determines the day mode or the night mode using the sun load received from the solar sensor of the vehicle in the cold operation mode during cooling operation,
In the day mode, when the battery voltage exceeds the first preset voltage and the state of charge of the battery exceeds the second preset charging rate, the electric compressor is driven to cool the battery, and the battery voltage is higher than the first preset voltage. When the voltage is lower than the second set voltage which is set lower than or when the state of charge of the battery is lower than or equal to the third set which is lower than the second charge rate, or when the temperature difference is equal to or greater than the first set temperature, the driving of the electric compressor is stopped and the To control the lighting of the warning light to guide charging,
In the night mode, when the battery voltage exceeds the first set voltage and the state of charge of the battery exceeds the second charge rate, the motor-driven compressor is controlled to cool and the battery voltage is lower than or equal to the second set voltage. When the state of charge of the battery is less than the third charge rate, or the current room temperature is above the first set temperature, characterized in that the control of the warning light to turn on to stop the driving of the electric compressor and guide the charging of the battery Heating and cooling system for commercial vehicles. The method according to claim 1 or 2,
Further comprising a communication unit for communicating with a smart device installed of a dedicated application for operating the air conditioning system for commercial vehicles,
The control unit determines that the driving state when the rotation speed of the engine during the heating operation is more than the predetermined set speed,
If the engine load exceeds the preset first load rate during the first preset time in the driving state, the auxiliary heater is driven and heated, and if the coolant temperature received from the water temperature sensor of the vehicle is greater than or equal to the third preset temperature, Control to stop driving of the auxiliary heater,
When the temperature difference between the set temperature and the current indoor temperature of the vehicle is less than the fourth preset temperature in the non-moving state, the auxiliary heater is controlled to be heated to be heated, and the temperature difference is greater than or equal to the fifth preset temperature set smaller than the fourth preset temperature. If it is controlled to stop the driving of the auxiliary heater,
Cooling and heating system for a commercial vehicle, characterized in that for controlling the heating or cooling operation according to the temperature set through the communication unit. (a) checking whether the cooling mode is set when the on operation command of the air conditioning system for a commercial vehicle is input through the operation unit;
(b) checking whether the engine speed exceeds the preset engine speed when the air conditioner mode is set as a result of the test of step (a);
(c) If the engine speed exceeds the set speed as the inspection result of step (b), it is determined that the vehicle is in a driving state and enters the driving mode, and the engine is linked to the engine based on the driving state of the vehicle and the engine load ratio. Selectively driving a driven mechanical compressor or an electric compressor driven by battery power to cool a space inside a cab of a commercial vehicle,
(d) If the engine speed is equal to or less than the set speed as the inspection result of step (b), it is determined that the engine is in the dead state and enters the dead mode, and the daytime is based on the sun load received from the solar sensor of the vehicle. Entering a mode or a night mode to drive the electric compressor based on a state of a battery to cool a space inside a cab of a commercial vehicle,
(e) checking whether the engine speed exceeds the set engine speed when the heating mode is set as a result of the test of step (a);
(f) If the engine speed exceeds the set speed as a result of the inspection in the step (e), it is determined that the vehicle is in a driving state and enters the driving mode, and the bed is heated based on the engine load rate and the coolant temperature of the vehicle. Driving heating by driving an auxiliary heater; and
(g) If the engine speed is equal to or less than the set speed as the inspection result of the step (e), the engine is determined to be in the dead state and enters the bypass mode, and the auxiliary is based on the temperature difference between the indoor temperature of the vehicle and the set temperature. And a heating operation by driving a heater. The method of claim 6, wherein step (c)
(c1) driving the mechanical compressor to cool the air in the driving mode;
(c2) if the engine load exceeds the first load rate for the first preset time and the temperature difference is less than or equal to the preset first preset temperature, driving the electric compressor to control cooling;
(c3) if the engine load is less than the first load rate during the second set time longer than the first set time and the temperature difference exceeds the second set temperature set greater than the first set temperature, the mechanical compressor is driven again. Control method of a heating and cooling system for a commercial vehicle comprising the step of cooling. The method of claim 6, wherein step (d)
(d1) determining the day mode or the night mode using the sun load received from the solar sensor of the vehicle in the non-move mode;
(d2) if it is determined that the day mode is selected, when the battery voltage exceeds the first preset voltage and the state of charge of the battery exceeds the second preset charging rate, controlling the cooling to operate the motor-driven compressor.
(d3) the battery voltage is less than or equal to the second set voltage set lower than the first set voltage, or the state of charge of the battery is less than or equal to the third charge rate set lower than the second charging rate, or the first set temperature at which the temperature difference is preset If abnormal, stopping the driving of the motor-driven compressor and controlling the warning lamp to light to guide the charging of the battery,
(d4) controlling to cool by driving the motor-driven compressor when the battery voltage exceeds the first set voltage and the state of charge of the battery exceeds the second charge rate, when determined as the night mode;
(d5) if the battery voltage is equal to or less than the second set voltage, the state of charge of the battery is equal to or less than the third charge rate, or the current room temperature is equal to or greater than the first set temperature, the driving of the electric compressor is stopped and the battery Control of the heating and cooling system for a commercial vehicle, comprising the step of controlling the lighting of the warning light to guide the charging of. The method according to any one of claims 6 to 8,
In the step (f), if the engine load exceeds the preset first load rate during the preset first preset time in the driving mode, the auxiliary heater is driven to heat and the coolant temperature received by the water temperature sensor of the vehicle is increased. When the temperature is equal to or greater than a third preset temperature, the driving of the auxiliary heater is stopped.
In the step (g), if the temperature difference is less than the fourth preset temperature in the dead state, the auxiliary heater is controlled to be heated to be heated. If the temperature difference is greater than or equal to the fifth preset temperature smaller than the fourth preset temperature, Control method of a heating and cooling system for a commercial vehicle, characterized in that the control to stop the driving of the auxiliary heater.

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