CN1884804A - Water cooling system of engine and cooling method thereof - Google Patents
Water cooling system of engine and cooling method thereof Download PDFInfo
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- CN1884804A CN1884804A CN 200510021169 CN200510021169A CN1884804A CN 1884804 A CN1884804 A CN 1884804A CN 200510021169 CN200510021169 CN 200510021169 CN 200510021169 A CN200510021169 A CN 200510021169A CN 1884804 A CN1884804 A CN 1884804A
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Abstract
The invention relates to an engine water cooling system and relative cooling method, wherein the first sensor senses the working condition of engine; the cooling liquid temperature sensor senses the temperature of cooling liquid inside the engine; the control unit responds the signals of first sensor and the cooling liquid temperature sensor, to control the electric water pump to operate when the temperature of cooling liquid is higher than the first preset temperature when the engine starts, to drive the cooling liquid to cool the engine, to improve the starting property of engine and the discharging property of heating machine; and the electric controller based on the operation parameter of engine and the temperature of cooling liquid, controls the switch of electric valve, the electric water pump and the rotation speed of electric fan, to control the circulation and the flux of cooling liquid, and the cooling ability of cooling fan, to improve the property of engine.
Description
[technical field]
The present invention relates to engine water-cooling system for water and cooling means.
[background technique]
The cooling system that at present domestic and international automobile the most generally adopts is an engine water-cooling system for water, and the composition of existing constituent is: water pump, short circle, major cycle, thermostat, cooling-water temperature transmitter, radiator, cooling fan 100.Short circle is drawn from water pump, through the cylinder block and the cylinder head jacket of motor, draws outside engine block again and gets back to water pump.Major cycle is drawn from water pump, and the cylinder block of process motor and cylinder head jacket, thermostat, radiator draw at last again and get back to water pump.Fan 100 is positioned at the radiator inboard, is used to improve the heat dissipation potential of radiator.Its working procedure as shown in Figure 1, when engine start, water pump and fan 100 are worked under the driving of engine crankshaft simultaneously, when coolant temperature was low, thermostat was in closed condition, cooling liquid circulates in short circle under the driving of water pump.Along with the warm-operation of motor, coolant temperature constantly raises, and when temperature acquired a certain degree, thermostat was opened, and cooling liquid circulates in major cycle under the driving of water pump, reaches the purpose of cooled engine.Some are perfect although this cooling system has been carried out both at home and abroad, but still deposit following drawback:
1. in engine start, particularly during cold starting, water pump and cooling fan be running simultaneously under engine-driving, the one, loss engine power, because this moment, the temperature of motor was also lower, do not need to dispel the heat fast, when this external driving water pump and fan, can reduce the starting speed of engine-driving engine crankshaft, this starting success rate and starting time to motor has certain influence; The 2nd, in the engine warm-up process, cooling liquid circulates in short circle, rapid heat dissipation, the temperature of engine coolant rises will be slow, cause in the cylinder temperature lower, fuel-oil atmozation and evaporate badly causes the incomplete large percentage of fuel combustion, and produce a large amount of air pollutant such as HC (hydrocarbon) and CO (carbon monoxide), cause noxious gas emission.
2. the moment is controlled by thermostat because the size of engine coolant circulates, and this will promptly be short of engine coolant size circulation control constantly to some extent because of its control accuracy is not high, to the certain influence of performance generation of motor.
3. the flow of cooling liquid size is directly related with the running speed of water pump, and the power of water pump is from the mechanical transmission of engine crankshaft, same cooling fan also is to be driven by engine crankshaft, so all the rotating speed with motor is relevant for the cooling capacity of the flow size of cooling liquid and cooling fan.That is to say that when motor slowly rotated, the flow of cooling liquid was little, a little less than the cooling capacity of fan; And when high engine speeds was rotated, the flow of cooling liquid was big, and cooling capacity is strong.So when engine speed changes, the flow of cooling liquid and the cooling capacity of fan will change thereupon, this just might cause the rapid rising of coolant temperature, and make motor be in condition of poor owing to a large amount of heating value of the motor timely quick heat radiating of failing.
[summary of the invention]
Main purpose of the present invention is exactly in order to solve prior art problems, a kind of engine water-cooling system for water is provided,, electric water pump is not rotated when engine cold starting according to the operating conditions of motor, improve the cold-start performance of motor, the discharging when reducing cold starting.
Of the present invention time a purpose just provides a kind of engine water-cooling system for water, can accurately control the big or small circuit conversion of constituent.
A further object of the present invention just provides a kind of engine water-cooling system for water, cools off according to coolant temperature rather than according to the rotating speed of motor, and cooling effect is better.
Another object of the present invention is exactly in order to solve prior art problems, a kind of cooling means of engine water-cooling system for water is provided,, electric water pump is not rotated when engine cold starting according to the operating conditions of motor, improve the cold-start performance of motor, the discharging when reducing cold starting.
Another purpose of the present invention just provides a kind of cooling means of engine water-cooling system for water, cools off according to coolant temperature rather than according to the rotating speed of motor, and cooling effect is better.
A further object of the present invention just provides a kind of cooling means of engine water-cooling system for water, change into by working state at motor and to stop operating, when cooling-water temperature transmitter senses engine temperature when still higher, control unit may command electric water pump and the electric fan certain hour that remains in operation, thus the unbalanced high temperature of motor avoided.
For achieving the above object, a kind of engine water-cooling system for water that the present invention proposes comprises:
Motor;
Electric water pump;
The circulation water channel, the cooling liquid in it can be under the driving of water pump, and the motor of flowing through returns water pump at last;
First sensor, the working condition of induction generator;
The temperature of the cooling liquid in the cooling-water temperature transmitter, induction generator;
Control unit, the signal of response first sensor and temperature transducer output, the control electric water pump turns round during greater than first setting temperature in bring into operation back and the temperature of cooling liquid of motor, flows in cyclic water jacket so that drive cooling liquid, and motor is cooled off.
Further improvement of the present invention is: also comprise radiator and by the electric control valve of control unit control opening and closing; Described circulation water channel comprises short circle and major cycle, cooling liquid in the described short circle can be under the driving of water pump, flow through behind the motor, promptly outside engine block, get back to water pump, cooling liquid in the described major cycle can return water pump behind the motor of flowing through, electric control valve and the radiator under the driving of water pump; When described electric control valve was closed, ECL was in short circle, and when described electric control valve was opened, cooling liquid can flow in major cycle; Described control unit control electric control valve under motor is in running state, the temperature of cooling liquid opens during greater than second setting temperature, described second setting temperature is greater than first setting temperature.
Of the present invention further the improvement is: also comprise the electric fan that is used for cooling radiator, described control unit control electric fan under motor is in running state, the temperature of cooling liquid turns round during greater than the 3rd setting temperature, described the 3rd setting temperature is greater than second setting temperature.
For achieving the above object, the cooling means of a kind of engine water-cooling system for water that the present invention proposes may further comprise the steps:
The temperature of the cooling liquid in the A) working condition of first sensor induction generator, cooling-water temperature transmitter induction generator;
B) signal of control unit response first sensor and cooling-water temperature transmitter output, when motor brings into operation back and the temperature of cooling liquid during greater than first setting temperature, the running of control unit control electric water pump drives cooling liquid and flows in cyclic water jacket, and motor is cooled off.
Further improvement of the present invention is: at step B) further comprising the steps of afterwards:
C) signal of control unit response first sensor and cooling-water temperature transmitter output, when the temperature of cooling liquid during less than second setting temperature, control unit control electric control valve is closed, cooling liquid flows in short circle, when motor is under the running state and the temperature of cooling liquid during greater than second setting temperature, control unit control electric control valve is opened, water pump drives cooling liquid and flows through and return water pump behind motor, electric control valve and the radiator, and described second setting temperature is greater than first setting temperature.
Of the present invention further the improvement is: at step C) further comprising the steps of afterwards:
D) signal of control unit response first sensor and cooling-water temperature transmitter output, when motor is under the running state and the temperature of cooling liquid during greater than the 3rd setting temperature, control unit control electric fan low-speed running, described the 3rd setting temperature is greater than second setting temperature.
At step D) further comprising the steps of afterwards:
E) signal of control unit response first sensor and cooling-water temperature transmitter output, when motor is under the running state and the temperature of cooling liquid during greater than the 4th setting temperature, control unit control electric water pump runs up, and described the 4th setting temperature is greater than the 3rd setting temperature.
In step e) further comprising the steps of afterwards:
F) signal of control unit response first sensor and cooling-water temperature transmitter output, when motor is under the running state and the temperature of cooling liquid during greater than the 5th setting temperature, control unit control electric fan runs up, and described the 5th setting temperature is greater than the 4th setting temperature.
Of the present invention further the improvement again is: further comprising the steps of: the signal of control unit response first sensor and temperature transducer output, when motor is changed into when stopping operating by working state, control unit control electric water pump and electric fan remain in operation and shut down behind the certain hour.
The invention has the beneficial effects as follows: 1) ECU (Electrical Control Unit) receives from the engine operating parameter of sensor senses and the temperature of cooling liquid, through control program judge, after the computing, analysing and processing, the running of control of pump.When motor is in starting, particularly during cold state, control unit does not just send the instruction of control electric water pump and the running of cooling electric fan, because motor has been saved the traditional bent axle band transmission water pump and the energy of cooling fan, so can improve the starting speed of motor, this starting performance to motor is all extremely useful as starting success rate and starting time, also is of value to the exhaust pollution when reducing engine start.Simultaneously, because this moment, electric water pump did not turn round, and electric control valve is closed, cooling liquid just is still in the short circle, this will make the coolant temperature fast rise, thereby improve the performance of engine warm-up, particularly can reduce the discharging of HC and CO in the warming-up process, it is very important that this satisfies more and more stricter emission regulation demands to motor.Be of value to the energy-conservation of motor in addition, same operating conditions because reduced the energy consumption of water pump and fan, can improve the Economy of motor.2) unlatching of electric control valve is also controlled according to the engine operating parameter of sensor senses and the temperature of cooling liquid by control unit, and the validity height can accurately be controlled by the moment that short circle forwards major cycle to engine coolant.3) state of water pump, electric control valve and electric fan is controlled according to the running state of motor and the temperature of cooling liquid by control unit, can be independent of the rotating speed of motor, and according to the size of the heating value of engine operation condition control coolant rate, effectively cooled engine; And according to the intelligent cooling capacity of regulating cooling fan of the heating value of engine operation condition, fully cooled engine has really been accomplished to require cooled engine according to the cooling of motor.4) even behind engine shutdown, when cooling-water temperature transmitter is sensed engine temperature when higher, ECU (Electrical Control Unit) still may command electric water pump and electric fan remains in operation, and so that motor is cooled off, avoids the high temperature behind the engine shutdown, prolongs its life-span.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is the engine water-cooling system for water schematic representation of prior art;
Fig. 2 is an a kind of embodiment's of the present invention engine water-cooling system for water schematic representation;
Fig. 3 is the first portion of a kind of embodiment's of the present invention cooling control flow chart;
Fig. 4 is the second portion of a kind of embodiment's of the present invention cooling control flow chart.
Among Fig. 1,2, arrow
The flow direction of expression cooling liquid in major cycle, arrow
The flow direction of expression cooling liquid in short circle, arrow
The expression sensor signal, arrow
The control signal of expression control unit output.
[embodiment]
As shown in Figure 2, constituent comprises motor, first sensor, cooling-water temperature transmitter, electric water pump, circulation water channel, ECU (Electrical Control Unit), first sensor is used for the operation conditions of induction generator, engine rotation speed sensor can be, engine throttle position sensing device and engine load sensor can also be comprised again.Cooling-water temperature transmitter is used for the temperature of the cooling liquid in the induction generator.Can further include electric control valve, radiator and electric fan 200.The signal of control unit responding engine speed probe, engine throttle position sensing device, engine load sensor and cooling-water temperature transmitter is controlled electric water pump, electric control valve and electric fan respectively after the processing.The circulation water channel can comprise short circle and major cycle, cooling liquid in the short circle can behind the motor of flowing through, promptly be got back to water pump outside engine block under the driving of electric water pump, cooling liquid in the major cycle can return water pump behind the motor of flowing through, electric control valve and the radiator under the driving of water pump.Electric fan is positioned at the radiator inboard, during running radiator is dispelled the heat.ECU (Electrical Control Unit) can be by the chip microcontroller of embedded software, the signal of ECU (Electrical Control Unit) pick-up transducers also can be realized by existing circuit connecting method, ECU (Electrical Control Unit) can be controlled separately switching circuit conducting or disconnection, thereby make electric water pump, electric control valve and electric fan and power connection or disconnection by input, output circuit the control of electric water pump, electric control valve and electric fan by output high-low level signal.
Cooling means to present embodiment describes in detail below, and control flow is shown in Fig. 3,4.
In step 101, the operation conditions of first sensor induction generator, for example engine speed, engine load, engine throttle position, cooling-water temperature transmitter induction coolant temperature, execution in step 102 then;
In step 102, the output signal of control unit response first sensor and cooling-water temperature transmitter, execution in step 103 after treatment;
In step 103, the situation of comprehensive each signal of control unit judges whether motor is in cold state, if then execution in step 104; If not then turning to step 102, continue to receive the output signal of first sensor and temperature transducer;
In step 104, whether control unit judges coolant temperature greater than first setting temperature, if coolant temperature greater than first setting temperature, then execution in step 105; If not execution in step 110 then;
Because the coolant temperature of motor does not also raise, motor also is in warm-up period, does not need cooling, so in step 110, control unit control electric water pump does not turn round, and turns to step 102, continues to receive the output signal of first sensor and temperature transducer.At this moment, water pump does not turn round, and electric control valve is closed, fan does not turn round yet, and cooling liquid is still in the short circle, like this, coolant temperature helps improving the starting performance of motor because of the operation fast rise of motor, and can reduce the discharging of HC and CO in the warming-up process;
In step 105, control unit control electric water pump low-speed running, be the information of control unit according to cooling-water temperature transmitter, when confirming that coolant temperature has been elevated to first setting temperature of setting in the control program along with the operation of motor, will export control information, make the electric water pump entry into service, and keep low cruise.Because this moment, electric control valve was still closed, so cooling liquid flows in short circle under the driving of electric water pump, the heat dissipation potential of cooling liquid improves, but since this moment motor temperature also be not very high, so that the cooling capacity of cooling liquid does not need yet is very high.
The circulation of cooling liquid during the starting of above-mentioned steps may command, the emission performance in the time of not only can improving starting performance and warming-up can also be energy-conservation, improves the Economy of motor.
Further, can also continue execution in step 106.
In step 106, coolant temperature continues to raise, control unit is according to the information from cooling-water temperature transmitter, control unit judges whether motor is in running state and coolant temperature greater than second setting temperature of both having established, if execution in step 107 then, continue according to information if not control unit then, judge whether motor is in running state and coolant temperature greater than second setting temperature of both having established from temperature transducer.Second setting temperature is greater than first setting temperature;
In step 107, control unit sends the instruction that the control electric control valve is opened, and motor is effectively moved; After electric control valve was opened, cooling liquid flowed in major cycle by electric control valve under the driving of water pump, and cooling capacity further improves.
Can be by control unit according to the operating conditions of motor, precision controlling cooling liquid size circuit is constantly.
Further, can also continue execution in step 108.
In step 108, along with motor continues operation, coolant temperature further raises, control unit judges whether motor is in running state and coolant temperature greater than the 3rd setting temperature, if execution in step 109 then, continue according to information if not control unit then, judge whether motor is in running state and coolant temperature greater than the 3rd setting temperature of both having established from temperature transducer.The 3rd setting temperature is greater than second setting temperature.
In step 109, control unit control motor makes electric fan begin to rotate, and according to the cooling requirement of motor, is in low cruise.Fan can be accelerated the heat dissipation rate of radiator after rotating, thereby further improves the cooling capacity of cooling liquid.
Further, can also continue execution in step 111.
In step 111, along with motor continues operation, coolant temperature further raises, control unit judges whether motor is in running state and coolant temperature greater than the 4th setting temperature, if execution in step 112 then, continue according to information if not control unit then, judge whether motor is in running state and coolant temperature greater than the 4th setting temperature of both having established from temperature transducer.The 4th setting temperature is greater than the 3rd setting temperature;
In step 112, along with increasing of motor heating value, ECU (Electrical Control Unit) can be according to the signal of sensor, determine the operation conditions of cooling system, control the electric water pump high speed operation then, rotating speed by control of pump makes cooling liquid improve heat dissipation potential, thereby motor is carried out good cooling to adjust the flow of cooling liquid.
Further, can also continue execution in step 113.
When the high engine speeds high loaded process, can send a large amount of heats, coolant temperature can be higher, if can not take away heat so that motor is carried out good cooling this moment, too high temperature just produces certain influence to the lubricant film of motor, the component performance of motor etc., thereby reduces the performance of motor.Therefore in step 113, along with the motor operation, control unit judges whether motor is in running state and coolant temperature greater than the 5th setting temperature, if execution in step 114 then, continue according to information if not control unit then, judge whether motor is in running state and coolant temperature greater than the 5th setting temperature of both having established from temperature transducer.The 5th setting temperature is greater than the 4th setting temperature;
In step 114, when cooling-water temperature transmitter perceives motor when being in excessive temperature, control unit will be controlled electric fan and run up, and improves the cooling capacity of fan to radiator by the rotating speed that improves electric fan.This moment, ECU (Electrical Control Unit) strengthened the flow of cooling liquid by the high speed rotating of control electric water pump, also improve the cooling capacity of fan simultaneously to radiator by the high rotating speed of controlling electric fan, efficiently cooled engine fast makes motor reach preferable working state.
Further, can also continue execution in step 115.
In step 115, control unit judges whether motor transfers halted state to by running state, signal according to sensor, when detecting motor, control unit transfers then execution in step 116 of halted state to by running state, if motor keeps running state, then control unit continues the signal of response sensor, judges whether motor transfers halted state to by running state;
In step 116, controlling single control of pump and electric fan remains in operation and shuts down behind the certain hour, because when motor has just stopped, temperature is also very high, needs to continue cooling, with the anti-tamper motor, the certain hour if electric water pump and electric fan rerun after motor stops to continue motor is cooled off, and just can avoid the uneven high temperature of motor, prevent the premature aging of piston ring distortion and oil sealing, prolong the life-span of motor.
First, second, third and fourth, five setting temperatures are for according to test or the temperature value that sets of experience, its value increases successively, for example: first setting temperature is 75 ± 2 ℃, second setting temperature is 87 ± 2 ℃, the 3rd setting temperature is 95 ± 2 ℃, the 4th setting temperature is 98 ± 2 ℃, and the 5th setting temperature is 102 ± 2 ℃.Occurrence is also relevant with the concrete condition of motor, cooling liquid, fan etc.
In sum, the present invention receives engine operating parameter from sensor senses by ECU (Electrical Control Unit), through control program judge, after the computing, analysing and processing, cooling requirement according to motor, output signal, control the running moment and the switching of rotating speed, electric control valve and the rotating speed of adjusting electric fan of electric water pump,, motor is carried out good sufficient cooling with circulation, the size of coolant rate and the cooling capacity of cooling fan of control cooling liquid.
Claims (11)
1. engine water-cooling system for water comprises:
Motor;
Electric water pump;
The circulation water channel, the cooling liquid in it can be under the driving of water pump, and the motor of flowing through returns water pump at last;
It is characterized in that also comprising:
First sensor, the working condition of induction generator;
The temperature of the cooling liquid in the cooling-water temperature transmitter, induction generator;
Control unit, the signal of response first sensor and cooling-water temperature transmitter output, control of pump turns round during greater than first setting temperature in the bring into operation temperature of back and cooling liquid of motor.
2. engine water-cooling system for water as claimed in claim 1 is characterized in that: described first sensor comprises engine rotation speed sensor.
3. engine water-cooling system for water as claimed in claim 2 is characterized in that: described first sensor also comprises engine throttle position sensing device and engine load sensor.
4. as each described engine water-cooling system for water in the claim 1 to 3, it is characterized in that: also comprise radiator and by the electric control valve of control unit control opening and closing; Described circulation water channel comprises short circle and major cycle, cooling liquid in the described short circle can be under the driving of water pump, flow through behind the engine water jacket, promptly outside engine block, get back to water pump, cooling liquid in the described major cycle can return water pump behind the engine water jacket of flowing through, electric control valve and the radiator under the driving of water pump; When described electric control valve was closed, ECL was in short circle, and when described electric control valve was opened, cooling liquid can flow in major cycle; Described control unit control electric control valve under motor is in running state, the temperature of cooling liquid opens during greater than second setting temperature, described second setting temperature is greater than first setting temperature.
5. engine water-cooling system for water as claimed in claim 4, it is characterized in that: also comprise the electric fan that is used for cooling radiator, described control unit control electric fan under motor is in running state, the temperature of cooling liquid turns round during greater than the 3rd setting temperature, described the 3rd setting temperature is greater than second setting temperature.
6. the cooling means of engine water-cooling system for water is characterized in that may further comprise the steps:
The temperature of the cooling liquid in the A) working condition of first sensor induction generator, cooling-water temperature transmitter induction generator;
B) signal of control unit response first sensor and cooling-water temperature transmitter output, when motor brings into operation back and the temperature of cooling liquid during greater than first setting temperature, the running of control unit control electric water pump drives cooling liquid and flows in the circulation water channel, and motor is cooled off.
7. cooling means as claimed in claim 6 is characterized in that at step B) further comprising the steps of afterwards:
C) signal of control unit response first sensor and cooling-water temperature transmitter output, when the temperature of cooling liquid during less than second setting temperature, control unit control electric control valve is closed, cooling liquid flows in short circle, when motor is under the running state and the temperature of cooling liquid during greater than second setting temperature, control unit control electric control valve is opened, electric water pump drives cooling liquid and flows through and return water pump behind motor, electric control valve and the radiator, and described second setting temperature is greater than first setting temperature.
8. cooling means as claimed in claim 7 is characterized in that at step C) further comprising the steps of afterwards:
D) signal of control unit response first sensor and cooling-water temperature transmitter output, when motor is under the running state and the temperature of cooling liquid during greater than the 3rd setting temperature, control unit control electric fan low-speed running, described the 3rd setting temperature is greater than second setting temperature.
9. cooling means as claimed in claim 8 is characterized in that at step D) further comprising the steps of afterwards:
E) signal of control unit response first sensor and cooling-water temperature transmitter output, when motor is under the running state and the temperature of cooling liquid during greater than the 4th setting temperature, control unit control electric water pump runs up, and described the 4th setting temperature is greater than the 3rd setting temperature.
10. cooling means as claimed in claim 9 is characterized in that in step e) further comprising the steps of afterwards:
F) signal of control unit response first sensor and cooling-water temperature transmitter output, when motor is under the running state and the temperature of cooling liquid during greater than the 5th setting temperature, control unit control electric fan runs up, and described the 5th setting temperature is greater than the 4th setting temperature.
11. cooling means as claimed in claim 10, it is characterized in that further comprising the steps of: the signal of control unit response first sensor and cooling-water temperature transmitter output, when motor is changed into when stopping operating by working state, control unit control of pump and electric fan remain in operation and shut down behind the certain hour.
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|---|---|---|---|
| CN 200510021169 CN1884804A (en) | 2005-06-22 | 2005-06-22 | Water cooling system of engine and cooling method thereof |
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| CN 200510021169 CN1884804A (en) | 2005-06-22 | 2005-06-22 | Water cooling system of engine and cooling method thereof |
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2005
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