CN109339990B - Active flame air inlet preheating control system and method - Google Patents
Active flame air inlet preheating control system and method Download PDFInfo
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- CN109339990B CN109339990B CN201811279749.9A CN201811279749A CN109339990B CN 109339990 B CN109339990 B CN 109339990B CN 201811279749 A CN201811279749 A CN 201811279749A CN 109339990 B CN109339990 B CN 109339990B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
- F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
- F02M31/13—Combustion air
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Abstract
The invention provides an active flame air inlet preheating control system which comprises a power supply, an air inlet temperature sensor, a rotating speed sensor, a flame temperature sensor, an air inlet preheating controller, a glow plug, an oil supply electromagnetic valve and a preheating monitoring calibration device, wherein a preheating control unit is in control connection with the preheating monitoring calibration device through a CAN communication circuit, the glow plug is driven and controlled through a power driving circuit, a working current signal of the glow plug is collected through an overcurrent detection circuit, and the on-off of the oil supply electromagnetic valve is controlled through a switching value conditioning circuit. The invention effectively solves the problems of difficult starting, combustion deterioration, piston ablation and the like caused by low air inlet temperature when the high-power diesel engine is used in low-temperature environment, idling and low speed and low load, and can realize the smooth starting and sufficient combustion of the diesel engine in the low-temperature environment.
Description
Technical Field
The invention belongs to the field of engines, and solves the problem of preheating of inlet air under the starting and running working conditions of the engine.
Background
When the high-power diesel engine is used in low-temperature environment, idling and low speed and low load, the problems of combustion deterioration, piston ablation and the like are caused due to low air inlet temperature. In the prior art, a heating pot is adopted for heating a diesel engine with a 150 series mechanical pump, the starting time is long, the power consumption is high, especially in cold seasons, the battery capacity is reduced, too much battery capacity is shunted, the driving force of an electric motor is easy to be insufficient, and the starting rotating speed of the diesel engine cannot be reached.
Therefore, it is a problem to be solved by those skilled in the art to develop an intake air preheating system that can be started quickly, has low power consumption, is simple and easy to use, and has reliable performance.
Disclosure of Invention
In view of the above, the present invention is directed to an active flame intake preheating control system, which can automatically start an intake preheating function when detecting that an intake temperature is low, so as to solve the problems of difficult starting, poor combustion, piston ablation, etc. of a diesel engine in a low temperature environment.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an active flame intake preheat control system, comprising: a power supply, an air inlet temperature sensor, a rotating speed sensor, a flame temperature sensor, an air inlet preheating controller, a glow plug, an oil supply electromagnetic valve and a preheating monitoring calibration device,
the intake preheating controller comprises a preheating control unit, an analog quantity conditioning circuit, a rotating speed signal conditioning circuit, a CAN communication circuit, a power driving circuit, an overcurrent detection circuit and a switching value conditioning circuit,
the power supply, the air inlet temperature sensor and the flame temperature sensor are all in signal connection with the preheating control unit through an analog quantity conditioning circuit, and the rotating speed sensor is in signal connection with the preheating control unit through a rotating speed signal conditioning circuit;
the preheating control unit is connected with the preheating monitoring calibration device through the CAN communication circuit in a control mode, the power driving circuit drives and controls the glow plug, the overcurrent detection circuit collects working current signals of the glow plug, and the switching value conditioning circuit controls the on-off of the oil supply electromagnetic valve.
The intake preheating control method based on the active flame intake preheating control system comprises the following contents:
s1, a preheating controller is powered on, a system automatically acquires the air inlet temperature of an engine through an air inlet temperature sensor, and when the air inlet temperature is lower than a set value A1 ℃, the system enters a glow plug preheating working condition F1: the preheating controller outputs a PWM signal to control the heating of the glow plug;
s2, when the heating of the glow plug reaches the set time T1S, the system enters a starting prompting working condition F2: the preheating controller outputs prompt information to a preheating monitoring calibration device through a CAN communication circuit to prompt a driver to start an engine, and the maximum prompt time is set as T2S;
s3, under a starting prompting working condition F2, collecting a rotating speed signal by the system, and if the rotating speed is greater than a set value A2r/min, entering a flame preheating working condition F3 by the system: the glow plug and the oil supply electromagnetic valve work simultaneously, time T3S is set, flame temperature is collected through a flame temperature sensor, if the flame temperature reaches a set threshold value A3 ℃, the glow plug stops working, and the oil supply electromagnetic valve continues working; if the flame temperature does not reach the set threshold value, the ignition failure times are plus 1;
s4, under a starting prompting working condition F2, if the rotating speed is less than or equal to a set value A2r/min, the system enters a system sleep working condition F4: the glow plug and the oil supply electromagnetic valve stop working, and the system collects the air inlet temperature and the engine rotating speed at regular time;
s5, under a dormant working condition F4, if the air inlet temperature is detected to be lower than a set threshold value A1 ℃, and the engine speed is higher than a set value A2r/min, the system enters a glow plug preheating working condition F1 again;
s6, under a flame preheating working condition F3, if the flame temperature does not reach a set threshold A3 ℃ and the ignition failure times are less than a set value A4, the system enters a cooling working condition F5: stopping the work of the glow plug, and starting timing by the timer;
s7, after a timer set in the cooling working condition times T4S, the system enters the glow plug preheating working condition F1 again;
s8, under a flame preheating working condition F3, detecting that the air inlet temperature is greater than a set threshold A5 ℃, and entering a system dormancy working condition F4;
s9, under a flame preheating working condition F3, collecting flame temperature which does not reach a set threshold A3 ℃, and ignition failure times which are more than or equal to a set value A4, and enabling the system to enter a fault alarm working condition F6: the glow plug and the oil supply electromagnetic valve stop working, and fault information is transmitted to the preheating monitoring calibration device through the CAN communication circuit to prompt the fault information;
s10, in the operation process of the control system, if the overcurrent detection circuit detects that the current value of the glow plug is larger than a set threshold value A6A, an interrupt signal is output to the preheating control unit, and the system is switched to a fault alarm working condition F6 from the current operation working condition.
Advantageous effects
The active air inlet preheating control system and the control method thereof effectively solve the problems of difficult starting, combustion deterioration, piston ablation and the like caused by low air inlet temperature when a high-power diesel engine is used in a low-temperature environment, idling and low speed and low load, and can realize smooth starting and sufficient combustion of the diesel engine in the low-temperature environment;
the active air intake preheating function of the diesel engine under the starting and running working conditions is realized, and whether air intake preheating is needed or not can be automatically identified;
the system automatically turns to a dormant state after preheating is completed, so that the power consumption is reduced, and the service life of the preheating device is prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram of a preheat control system according to an embodiment of the present invention;
fig. 2 is a state transition diagram of the preheating control method according to the embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in FIG. 1, an active flame intake preheating control system comprises a power supply, an intake temperature sensor, a rotation speed sensor, a left row flame temperature sensor, a right row flame temperature sensor, an intake preheating controller, a left row glow plug, a right row glow plug, an oil supply solenoid valve and a preheating monitoring calibration device,
the intake preheating controller comprises a preheating control unit, an analog quantity conditioning circuit, a rotating speed signal conditioning circuit, a CAN communication circuit, a power driving circuit, an overcurrent detection circuit and a switching value conditioning circuit,
the power supply supplies power to the control system, and a voltage signal is input to an ADC (analog to digital converter) interface of the preheating control unit through the analog quantity conditioning circuit; the air inlet temperature sensor is used for collecting the air inlet temperature of the engine, and an output signal is input to an ADC (analog to digital converter) interface of the preheating control module through the analog quantity conditioning circuit; the left row flame temperature sensor is used for collecting the left row flame temperature, and an output signal is input to an ADC (analog-to-digital converter) interface of the preheating control unit through an analog quantity conditioning circuit; the right row flame temperature sensor is used for collecting the temperature of the right row flame, and an output signal is input to an ADC (analog-to-digital converter) interface of the preheating control unit through analog quantity conditioning electricity; the rotating speed sensor is used for collecting the rotating speed of the engine, and an output signal is input into a signal capturing interface of the preheating control unit through the rotating speed signal conditioning circuit; a CAN communication interface of the preheating control unit is connected with a preheating monitoring calibration device through a CAN communication circuit; a PWM output interface of the preheating control unit outputs a PWM control signal, and a power driving circuit drives the left and right rows of glow plugs to work; the current signals of the left and right rows of glow plugs are input to an external interrupt interface of the preheating control unit through a current detection circuit; the I/O port of the preheating control unit outputs a switching signal, and the switching on and off of the oil supply electromagnetic valve is controlled by the switching value conditioning circuit.
Based on the above control system, the intake air preheating control method of the present invention, with a control state transition diagram as shown in fig. 2, specifically includes the following processing procedures:
s1, a preheating controller is powered on, a system automatically acquires the air inlet temperature of an engine, when the air inlet temperature is lower than a set value by 20 ℃, an air inlet preheating function is started, and the system enters a glow plug preheating working condition F1;
glow plug preheat condition F1: the preheating controller outputs PWM signals to control the left row of glow plugs and the right row of glow plugs to heat;
s2, heating the left row of glow plugs and the right row of glow plugs for 40S, and enabling the system to enter a starting prompting working condition F2;
prompt start condition F2: the preheating controller outputs prompt information to the preheating monitoring calibration device through the CAN communication circuit, a screen of the device displays 'start request', prompts a driver to start an engine, and the maximum prompt time is set to be 60S;
s3, under a starting prompting working condition F2, acquiring a rotating speed signal by a preheating controller, and if the rotating speed is greater than a set value of 50r/min, enabling the system to enter a flame preheating working condition F3;
flame preheating condition F3: the preheating controller controls the two glow plugs and the electromagnetic valve to work simultaneously, the time is set for 30S, temperature signals of the two flame temperature sensors are collected, if the flame temperature reaches a set threshold value of 200 ℃, the two glow plugs stop working, the oil supply electromagnetic valve continues working, the flame temperature does not reach the set threshold value, and the ignition failure times are plus 1;
s4, prompting to start under the working condition F2, and if the rotating speed is less than or equal to the set value of 50r/min, enabling the system to enter a sleep working condition F4;
sleep condition F4: the glow plug and the electromagnetic valve stop working, and the system collects the air inlet temperature and the engine rotating speed at regular time;
s5, under a dormant working condition F4, detecting that the air inlet temperature is lower than a set threshold value by 20 ℃, and the rotating speed of the engine is higher than a set value by 50r/min, and enabling the system to enter a glow plug preheating working condition F1 again;
s6, under a flame preheating working condition F3, collecting flame temperature, wherein the flame temperature does not reach a set threshold value of 200 ℃, the ignition failure times are less than a set value for 3 times, and the system enters a cooling working condition F5;
cooling condition F5: stopping the work of the glow plug, and starting timing by the timer;
s7, after the timer set in the cooling working condition times for 10S, the system enters the glow plug preheating working condition F1 again;
s8, under a flame preheating working condition F3, detecting that the temperature of the air inlet temperature sensor is greater than a set threshold value by 30 ℃, and enabling the system to enter a preheating dormancy working condition;
s9, under a flame preheating working condition F3, collecting flame temperature, wherein the flame temperature does not reach a set threshold value of 200 ℃, the ignition failure times are more than or equal to a set value for 3 times, and the system enters a fault alarm working condition F6;
failure alarm F6: the glow plug and the oil supply electromagnetic valve stop working, fault information is transmitted to the preheating monitoring calibration device through CAN communication, and the screen of the device displays 'system fault'.
S10, in the operation process of the control system, when the overcurrent detection circuit detects that the current value of the glow plugs in the left row or the right row is larger than the set threshold value 20A, an interrupt signal is output to the preheating control unit, and the system is switched to a fault alarm working condition F6 from the current operation working condition.
The transition conditions corresponding to the 6 operating conditions from F1 to F6 of the control state transition diagram 2 are as follows:
TABLE 1 preheat State transition conditions
Remarking: when the current of the glow plug is detected to be larger than the set value A6A, the system shifts to a fault alarm working condition F6 from any working condition of the current work.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (1)
1. An air inlet preheating control method of an active flame air inlet preheating control system is characterized in that the active flame air inlet preheating control system comprises a power supply, an air inlet temperature sensor, a rotating speed sensor, a flame temperature sensor, an air inlet preheating controller, a glow plug, an oil supply electromagnetic valve and a preheating monitoring calibration device,
the intake preheating controller comprises a preheating control unit, an analog quantity conditioning circuit, a rotating speed signal conditioning circuit, a CAN communication circuit, a power driving circuit, an overcurrent detection circuit and a switching value conditioning circuit,
the power supply, the air inlet temperature sensor and the flame temperature sensor are all in signal connection with the preheating control unit through an analog quantity conditioning circuit, and the rotating speed sensor is in signal connection with the preheating control unit through a rotating speed signal conditioning circuit;
the preheating control unit is connected with the preheating monitoring calibration device through a CAN communication circuit in a control mode, drives and controls the glow plug through a power driving circuit, collects a working current signal of the glow plug through an overcurrent detection circuit, and controls the on-off of the oil supply electromagnetic valve through a switching value conditioning circuit;
the method comprises the following steps:
s1, a preheating controller is powered on, a system automatically acquires the air inlet temperature of an engine through an air inlet temperature sensor, and when the air inlet temperature is lower than a set value A1 ℃, the system enters a glow plug preheating working condition F1: the preheating controller outputs a PWM signal to control the heating of the glow plug;
s2, when the heating of the glow plug reaches the set time T1S, the system enters a starting prompting working condition F2: the preheating controller outputs prompt information to a preheating monitoring calibration device through a CAN communication circuit to prompt a driver to start an engine, and the maximum prompt time is set as T2S;
s3, under a starting prompting working condition F2, collecting a rotating speed signal by the system, and if the rotating speed is greater than a set value A2r/min, entering a flame preheating working condition F3 by the system: the glow plug and the oil supply electromagnetic valve work simultaneously, time T3S is set, flame temperature is collected through a flame temperature sensor, if the flame temperature reaches a set threshold A3 ℃, the glow plug stops working, and the oil supply electromagnetic valve continues working; if the flame temperature does not reach the set threshold value, the ignition failure times are plus 1;
s4, under a starting prompting working condition F2, if the rotating speed is less than or equal to a set value A2r/min, the system enters a system sleep working condition F4: the glow plug and the oil supply electromagnetic valve stop working, and the system collects the air inlet temperature and the engine rotating speed at regular time;
s5, under a dormant working condition F4, if the air inlet temperature is detected to be lower than a set threshold value A1 ℃, and the engine speed is higher than a set value A2r/min, the system enters a glow plug preheating working condition F1 again;
s6, under a flame preheating working condition F3, if the flame temperature does not reach a set threshold A3 ℃ and the ignition failure times are less than a set value A4, the system enters a cooling working condition F5: stopping the work of the glow plug, and starting timing by the timer;
s7, after a timer set in the cooling working condition times T4S, the system enters the glow plug preheating working condition F1 again;
s8, under a flame preheating working condition F3, detecting that the air inlet temperature is greater than a set threshold A5 ℃, and entering a system dormancy working condition F4;
s9, under a flame preheating working condition F3, collecting flame temperature which does not reach a set threshold A3 ℃, and ignition failure times which are more than or equal to a set value A4, and enabling the system to enter a fault alarm working condition F6: the glow plug and the oil supply electromagnetic valve stop working, and fault information is transmitted to the preheating monitoring calibration device through the CAN communication circuit to prompt the fault information;
s10, in the operation process of the control system, if the overcurrent detection circuit detects that the current value of the glow plug is larger than a set threshold value A6A, an interrupt signal is output to the preheating control unit, and the system is switched to a fault alarm working condition F6 from the current operation working condition.
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| CN111980840B (en) * | 2020-09-03 | 2022-04-29 | 河南柴油机重工有限责任公司 | Intake air heating system and method of V-shaped high-power diesel engine in low-temperature environment |
| CN112682227A (en) * | 2020-12-22 | 2021-04-20 | 中国北方发动机研究所(天津) | Air inlet flame heater of self-air-conditioning diesel engine |
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| US5377440A (en) * | 1992-12-23 | 1995-01-03 | Beru Ruprecht Gmbh & Co. Kg | Flame starting unit for a combustion device |
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