CN114046200B - Anti-overheating cooling system of hybrid power engine and control method thereof - Google Patents
Anti-overheating cooling system of hybrid power engine and control method thereof Download PDFInfo
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- CN114046200B CN114046200B CN202111319441.4A CN202111319441A CN114046200B CN 114046200 B CN114046200 B CN 114046200B CN 202111319441 A CN202111319441 A CN 202111319441A CN 114046200 B CN114046200 B CN 114046200B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/20—Cooling circuits not specific to a single part of engine or machine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
- F01P2003/024—Cooling cylinder heads
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- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention discloses an anti-overheating cooling system of a hybrid power engine and a control method thereof, wherein the anti-overheating cooling system comprises a one-way valve (8), an electronic water pump (9) and an electronic water pump control assembly; the cylinder cover water jacket (3), the one-way valve, the electronic water pump and the engine body water jacket are sequentially communicated end to form an electronic water pump cooling loop; the electronic water pump is electrically connected with the electronic water pump control assembly, and the electronic water pump control assembly is externally connected with an ECU (11); the electronic water pump control assembly comprises an electronic water pump controller (22), an engine water temperature sensor (33), an engine rotating speed sensor (44) and an environment temperature sensor (55); the engine water temperature sensor, the engine rotating speed sensor and the environment temperature sensor are connected with the ECU, and the ECU is connected with the electronic water pump through the electronic water pump controller. The invention can realize the quick and automatic cooling of the engine body water jacket and the cylinder cover water jacket when the engine is stopped, automatically switch on and off when the stop condition is met, and avoid the overheating of the hybrid power engine.
Description
Technical Field
The invention relates to a cooling system and a cooling control method of an engine, in particular to an overheating prevention cooling system of a hybrid power engine and a control method thereof.
Background
Compared with a common engine, the hybrid engine has more frequent starting and stopping working conditions, the engine stops instantly, water circulation stops, and local overheating and coolant vaporization are easy to occur in water jackets at cylinder covers and the like. Particularly, under the working condition of large engine load, the cooling system works at full load, the water temperature is high, and if the cooling system is in the working condition of frequent starting and stopping for a long time, the local overheating in a water jacket of a cylinder cover of an automobile engine is easily caused, the heat can not be dissipated for a long time, the heat balance of the engine is broken, and the phenomena of overheating of the engine and vaporization of cooling liquid are caused. The vaporization of the cooling liquid easily causes the damage of a cylinder gasket at the position of a cylinder close to a water jacket hole, so that a combustion chamber is communicated with a water channel, and severe water turning and gas overflowing of a radiator or an expansion water tank are caused.
The overheating and coolant vaporization failures of the hybrid engine are accompanied by the decrease and deterioration of the coolant, vicious circulation, the engine cannot be cooled well, and a number of engine failure problems are caused, such as: when the temperature of the engine is too high, the viscosity of the lubricating oil is reduced along with the temperature, and a good oil film cannot be formed on the friction surface, so that the lubricating condition is worsened, and the abrasion of parts is aggravated; parts such as a piston, a connecting rod and the like expand when heated, and the clearance of a friction pair is reduced or even disappears, so that the abrasion is aggravated, and even serious faults such as cylinder pulling or shaft holding and the like occur; the vehicle is more seriously out of control, the impact force generated by the vehicle on other vehicles or pedestrians is huge, serious traffic accidents are often caused, and inestimable damage and loss are caused, so that the overheating of an engine is avoided, and the engine cooling system is ensured to normally ensure that the running stability and controllability of the vehicle can be ensured.
During the development of the whole vehicle, a thermal balance test needs to be carried out on a cooling system of the hybrid power engine so as to verify the adaptability of the cooling system. However, the thermal balance test of the existing cooling system is carried out based on the continuous operation working condition of the whole vehicle, is not suitable for the frequent start-stop working condition of the hybrid power engine under the state of higher load and water temperature, and can not effectively ensure the safety performance of the hybrid power engine. After the hybrid engine is overheated, an additional cooling water pump needs to be manually started or the hybrid engine needs to be idled for a period of time, and the hybrid engine can be stopped after being cooled, so that the operation is inconvenient, and the use of the hybrid engine is influenced.
Disclosure of Invention
One of the objectives of the present invention is to provide an overheat-proof cooling system for a hybrid engine, which can automatically cool a body water jacket and a cylinder head water jacket by an electronic water pump in a stop state of the hybrid engine.
The invention also aims to provide a control method of the anti-overheating cooling system of the hybrid power engine, which can realize the quick and automatic cooling of the engine body water jacket and the cylinder cover water jacket in the stop state of the hybrid power engine by utilizing the opening, closing and operation speed regulation of the electronic water pump.
The invention is realized by the following steps:
an anti-overheating cooling system of a hybrid power engine comprises a mechanical water pump small circulation cooling loop formed by sequentially connecting a cylinder cover water jacket, a thermostat, a mechanical water pump and a machine body water jacket end to end, a mechanical water pump large circulation cooling loop formed by sequentially connecting the cylinder cover water jacket, the thermostat, a radiator, the mechanical water pump and the machine body water jacket end to end, and a cooling assembly connected between a water outlet of the mechanical water pump and a water inlet of the machine body water jacket;
the anti-overheating cooling system of the hybrid power engine further comprises a one-way valve, an electronic water pump and an electronic water pump control assembly; the water outlet of the cylinder cover water jacket is communicated with the water inlet of the one-way valve, the water outlet of the one-way valve is communicated with the water inlet of the electronic water pump, the water outlet of the electronic water pump is communicated with the water inlet of the engine body water jacket, and the water inlet of the cylinder cover water jacket of the water outlet of the engine body water jacket is communicated to form an electronic water pump cooling loop; the control end of the electronic water pump is electrically connected with the control assembly of the electronic water pump, and the control assembly of the electronic water pump is externally connected with an ECU;
the electronic water pump control assembly comprises an electronic water pump controller, an engine water temperature sensor, an engine rotating speed sensor and an environment temperature sensor; the output ends of the engine water temperature sensor, the engine rotating speed sensor and the environment temperature sensor are respectively connected with the input end of the ECU, and the output end of the ECU is connected with the electronic water pump through the electronic water pump controller.
The engine water temperature sensor is arranged at a water outlet of a cylinder cover of the hybrid power engine; the engine speed sensor is arranged on a crankshaft of the hybrid power engine; the ambient temperature sensor is disposed on the vehicle and remote from the hybrid engine.
The control method of the overheat prevention cooling system of the hybrid engine comprises the following steps:
step 1: the ECU judges whether the hybrid power engine is in a high-temperature state, if so, the step 3 is executed, and if not, the electronic water pump does not act;
step 2: the ECU judges whether the hybrid power engine is in a stop state, if so, the step 3 is executed, and if not, the electronic water pump does not act;
and step 3: the ECU judges whether the working condition of the hybrid power engine simultaneously meets a high-temperature state and a shutdown state, if so, the electronic water pump controller is started to control the electronic water pump to operate, if not, the electronic water pump does not act, and the step 1 is returned;
and 4, step 4: the ECU judges whether the electronic water pump stop condition is met, if so, the ECU closes the electronic water pump through an electronic water pump controller, and if not, the ECU waits for the stop condition of the electronic water pump to be met;
the stop condition of the electronic water pump comprises the following steps:
(I) The hybrid engine is in a non-stop state;
(II) the hybrid engine is in a non-high temperature state;
(III) the single running time of the electronic water pump reaches the maximum set time;
when one of the above conditions (I), (II), and (III) is satisfied, the stop condition of the electronic water pump is considered to be satisfied.
In the step 1, the method for judging the high-temperature state of the hybrid power engine comprises the following steps:
step 1.1: presetting a first temperature threshold in an ECU;
step 1.2: collecting a coolant temperature signal of the hybrid power engine in real time through an engine water temperature sensor, and sending the coolant temperature value to an ECU (electronic control unit);
step 1.3: the ECU compares the coolant temperature signal with a first temperature threshold, if the coolant temperature value is greater than the first temperature threshold, the step 1.4 is executed, and if the coolant temperature value is less than or equal to the first temperature threshold, the step 1.2 is returned;
step 1.4: and the ECU judges whether the duration of the temperature value of the cooling liquid larger than the first temperature threshold exceeds a first time threshold, if so, the hybrid engine is in a high-temperature state, and if not, the hybrid engine is in a normal state.
In the step 2, the method for judging the stop state of the hybrid power engine comprises the following steps:
step 2.1: acquiring a rotating speed signal of the hybrid power engine in real time through an engine rotating speed sensor, and sending a rotating speed value to an ECU (electronic control unit);
step 2.2: the ECU judges whether the rotating speed value is equal to 0, if so, the step 2.3 is executed, and if not, the hybrid power engine is not in a stop state;
step 2.3: and the ECU judges whether the duration time of the rotating speed value equal to 0 exceeds a second time threshold value, if so, the hybrid engine is in a stop state, and if not, the hybrid engine is not in the stop state.
In step 3, the method for controlling the electronic water pump to operate by the electronic water pump controller is as follows:
step 3.1: the engine water temperature sensor sends the temperature value of the cooling liquid to the ECU in real time, the engine rotating speed sensor sends the rotating speed value to the ECU in real time, and the environment temperature sensor collects an environment temperature signal in real time and sends an environment temperature value to the ECU;
step 3.2: the ECU is communicated with the electronic water pump controller in a PWM (pulse-width modulation) mode, and outputs a PWM duty ratio signal to the electronic water pump controller according to the temperature value of the cooling liquid and the environmental temperature value;
step 3.3: in the running process of the electronic water pump, the electronic water pump controller adjusts the rotating speed of the electronic water pump in real time according to the PWM duty ratio signal until the stop condition of the electronic water pump is met;
the regulation logic of the rotating speed of the electronic water pump is as follows:
when the starting condition of the electronic water pump is not met, namely the working condition of the hybrid power engine does not meet the high-temperature state and the shutdown state at the same time, the PWM duty ratio signal is 10%, and the electronic water pump does not act at the moment;
when the temperature of the cooling liquid is =90 ℃, the PWM duty ratio signal is 13%, and the electronic water pump operates according to the lowest calibrated rotating speed;
when the temperature of the cooling liquid is =100 ℃, the PWM duty ratio signal is 85%, and the electronic water pump operates according to the highest calibration rotating speed;
when the first temperature threshold value is less than or equal to the temperature of the cooling liquid and less than 90 ℃, the PWM duty ratio signal is subjected to linear difference adjustment along with the change of the temperature of the cooling liquid within the range of (10 percent and 13 percent), and the electronic water pump operates according to the lowest calibrated rotating speed;
when the temperature of the cooling liquid is higher than 90 ℃ and lower than 100 ℃, the PWM duty ratio signal is subjected to linear difference adjustment along with the change of the temperature of the cooling liquid within the range of (13 percent and 85 percent), and the rotating speed of the electronic water pump is subjected to linear difference adjustment along with the change of the PWM duty ratio signal within the range of (1000 revolutions per minute and 6000 revolutions per minute);
when the temperature of the cooling liquid is higher than 100 ℃, the PWM duty ratio signal is subjected to linear difference adjustment along with the temperature change of the cooling liquid within the range of (85 percent, 100 percent), and the electronic water pump operates according to the highest calibration rotating speed;
when the ambient temperature is higher than 50 ℃, the PWM duty ratio signal is additionally increased by 20%;
if the PWM duty signal exceeds 100%, the output value of the PWM duty signal is 100%.
In the step 3.3, in the process of operating the electronic water pump, the ECU monitors the operating state of the electronic water pump through the electronic water pump controller, and the operating state monitoring method of the electronic water pump is as follows:
step 3.3.1: the electronic water pump controller collects the running state signal of the electronic water pump and judges the running state of the electronic water pump according to the running state signal; if the electronic water pump is in a normal running state, the electronic water pump does not act; if the electronic water pump is in a fault state, executing a step 3.3.2;
the running state signal of the electronic water pump comprises: input voltage, input current, and coolant temperature; the fault states of the electronic water pump comprise overvoltage, undervoltage, overcurrent and overtemperature;
step 3.3.2: the electronic water pump controller stops the operation of the electronic water pump, simultaneously feeds back a fault signal of the electronic water pump to the ECU, and the ECU feeds back the fault signal to the vehicle instrument.
In step 4, the method for judging whether the hybrid engine is in the non-stop state is as follows:
step 4.11: acquiring a rotating speed signal of the hybrid power engine in real time through an engine rotating speed sensor, and sending a rotating speed value to an ECU (electronic control unit);
step 4.12: the ECU judges whether the rotating speed value is greater than 0, if so, the step 4.13 is executed, and if not, the hybrid power engine is in a stop state;
step 4.13: and the ECU judges whether the duration time of the rotating speed value which is greater than 0 exceeds a third time threshold value, if so, the hybrid power engine is in a non-stop state, and if not, the hybrid power engine is in a stop state.
In the step 4, the method for judging that the hybrid power engine is in the non-high temperature state comprises the following steps:
step 4.21: presetting a second temperature threshold in the ECU;
step 4.22: collecting a coolant temperature signal of the hybrid power engine in real time through an engine water temperature sensor, and sending the coolant temperature value to an ECU (electronic control unit);
step 4.23: the ECU compares the coolant temperature signal with a second temperature threshold, if the coolant temperature value is less than the second temperature threshold, the step 4.24 is executed, and if the coolant temperature value is more than or equal to the second temperature threshold, the step 4.22 is returned;
step 4.24: and the ECU judges whether the duration time that the coolant temperature value is less than the second temperature threshold exceeds a fourth time threshold, if so, the hybrid engine is in a non-high temperature state, and if not, the hybrid engine is in a high temperature state.
In the step 4, the method for judging whether the single running time of the electronic water pump reaches the maximum set time is as follows:
step 4.31: presetting the maximum set time for the operation of the electronic water pump in the ECU;
step 4.32: the ECU records the single running time of the electronic water pump, and when the single running time is more than or equal to the maximum set time, the single running time of the electronic water pump reaches the maximum set time; after the electronic water pump is stopped, the ECU resets the single operation time of the electronic water pump to 0.
Compared with the prior art, the invention has the following beneficial effects:
1. the anti-overheating cooling system is characterized in that the engine body water jacket and the cylinder cover water jacket are respectively connected with the engine body water jacket and the cylinder cover water jacket in parallel, and the engine body water jacket and the cylinder cover water jacket are respectively connected with the engine body water jacket and the cylinder cover water jacket.
2. The anti-overheating cooling system is provided with the electronic water pump control assembly, so that the electronic water pump can be started, closed and controlled in speed regulation based on the temperature of cooling liquid, the ambient temperature, the rotating speed and the duration of an engine, and the engine body water jacket and the cylinder cover water jacket can be cooled quickly and effectively by the cooling loop of the electronic water pump.
3. The Control method of the invention collects the temperature of the cooling liquid, the ambient temperature and the rotating speed of the engine through an Electronic Control Unit (ECU) on the vehicle, namely an Electronic Control Unit, namely a driving Control computer on the vehicle, and controls the opening, closing and operating speed of the Electronic water pump by combining with the Electronic water pump controller, the Control method is simple, reasonable and efficient, can effectively solve the problem that the cylinder cover can not be circulated and cooled due to frequent shutdown of the hybrid power engine under the heavy-load working condition, and can intelligently and efficiently Control the circulation of the cooling liquid according to the working condition of the high-temperature rapid shutdown of the hybrid power engine to avoid the problems of cylinder cushion flushing and water overturning due to overheating of the engine cylinder cover, thereby protecting the engine from being damaged and protecting the personal safety of drivers and passengers.
The electronic water pump is started based on the high temperature and the stop state of the hybrid power engine, the quick and automatic cooling of the engine body water jacket and the cylinder cover water jacket in the stop state of the hybrid power engine is realized through the circulation of the cooling liquid, and the electronic water pump is automatically closed after the stop condition is met, so that the overheating problem of the hybrid power engine caused by frequent start and stop under the large-load working condition and other faults of the engine caused by overheating are effectively avoided.
Drawings
FIG. 1 is a functional block diagram of an anti-overheating cooling system for a hybrid engine of the present invention;
fig. 2 is a flowchart of a control method of an overheat prevention cooling system of a hybrid engine of the present invention.
In the figure, 1 mechanical water pump, 2 engine body water jackets, 3 cylinder cover water jackets, 4 thermostats, 5 radiators, 6 EGR (Exhaust Gas recirculation) cooler, 7 engine oil cooler, 8 one-way valves, 9 electronic water pump, 11 ECU,22 electronic water pump controller, 33 engine water temperature sensor, 44 engine speed sensor and 55 ambient temperature sensor.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, an overheat prevention cooling system of a hybrid engine includes a mechanical water pump 1, a body water jacket 2, a cylinder cover water jacket 3, a thermostat 4, a radiator 5, a cooling component, a check valve 8, an electronic water pump 9, and an electronic water pump control component.
The water outlet of the cylinder cover water jacket 3 is communicated with the water inlet of the thermostat 4, the small circulation water outlet of the thermostat 4 is communicated with the water inlet of the mechanical water pump 1, the water outlet of the mechanical water pump 1 is communicated with the water inlet of the engine body water jacket 2, and the water outlet of the engine body water jacket 2 is communicated with the water inlet of the cylinder cover water jacket 3, so that a small circulation cooling loop of the mechanical water pump is formed. The mechanical water pump small circulation cooling loop can adopt a cooling liquid circulation loop driven by a traditional mechanical water pump driven by a belt.
The water outlet of the cylinder cover water jacket 3 is communicated with the water inlet of the thermostat 4, the large circulation water outlet of the thermostat 4 is communicated with the water inlet of the radiator 5, the water outlet of the radiator 5 is communicated with the water inlet of the mechanical water pump 1, the water outlet of the mechanical water pump 1 is communicated with the water inlet of the engine body water jacket 2, and the water outlet of the engine body water jacket 2 is communicated with the water inlet of the cylinder cover water jacket 3 to form a large circulation cooling loop of the mechanical water pump. The mechanical water pump large circulation cooling loop can adopt a cooling liquid circulation loop driven by a traditional mechanical water pump driven by a belt.
The water outlet of the mechanical water pump 1 is communicated with the water inlet of the cooling assembly, and the water outlet of the cooling assembly is communicated with the water inlet of the machine body water jacket 2.
The water outlet of the cylinder cover water jacket 3 is communicated with the water inlet of the one-way valve 8, the water outlet of the one-way valve 8 is communicated with the water inlet of the electronic water pump 9, the water outlet of the electronic water pump 9 is communicated with the water inlet of the engine body water jacket 2, and the water outlet of the engine body water jacket 2 is communicated with the water inlet of the cylinder cover water jacket 3 to form an electronic water pump cooling loop. The cooling loop of the electronic water pump is a loop of a cylinder cover and engine body cooling liquid driven by the electronic water pump 9, and the shutdown cooling function is realized.
The control end of the electronic water pump 9 is electrically connected with the electronic water pump control component, and the electronic water pump control component is externally connected with an ECU 11. The electronic water pump control assembly can be directly controlled by a vehicle-mounted driving control computer or by an independent controller device.
The electronic water pump control assembly comprises an electronic water pump controller 22, an engine water temperature sensor 33, an engine rotating speed sensor 44 and an environment temperature sensor 55; the output ends of the engine water temperature sensor 33, the engine speed sensor 44 and the environment temperature sensor 55 are respectively connected with the input end of the ECU 11, and the output end of the ECU 11 is connected with the electronic water pump 9 through the electronic water pump controller 22.
The engine water temperature sensor 33 is arranged at a cylinder head water outlet of the hybrid power engine and used for detecting the temperature of the cooling liquid of the hybrid power engine. Preferably, the engine water temperature sensor 33 may be a heat-sensitive water temperature sensor.
The engine speed sensor 44 is provided on a crankshaft of the hybrid engine for detecting the rotational speed of the hybrid engine. Preferably, the engine speed sensor 44 may be an electromagnetic induction type speed sensor.
The environment temperature sensor 55 is arranged on the vehicle and far away from the hybrid power engine, and the arrangement position of the environment temperature sensor 55 can reflect the working environment temperature of the hybrid power engine and is used for detecting the environment temperature.
The cooling assembly comprises an EGR cooler 6 and an engine oil cooler 7, a water outlet of the mechanical water pump 1 is respectively communicated with water inlets of the EGR cooler 6 and the engine oil cooler 7, and water outlets of the EGR cooler 6 and the engine oil cooler 7 are respectively communicated with a water inlet of the engine body water jacket 2.
Referring to fig. 1 and 2, a control method of an overheat prevention cooling system of a hybrid engine, which is implemented based on the overheat prevention cooling system of the hybrid engine, includes the following steps:
step 1: the ECU 11 determines whether the hybrid engine is in a high temperature state, if so, step 3 is executed, and if not, the electronic water pump 9 is not operated.
In the step 1, the method for judging the high-temperature state of the hybrid power engine comprises the following steps:
step 1.1: a first temperature threshold is preset in the ECU 11, which may be calibrated at the time of development depending on the performance of the hybrid engine. Preferably, the value range of the first temperature threshold is 85-95 ℃.
Step 1.2: the coolant temperature signal of the hybrid engine is collected in real time by the engine water temperature sensor 33, and the coolant temperature value is sent to the ECU 11.
Step 1.3: the ECU 11 compares the coolant temperature signal with the first temperature threshold, if the coolant temperature value is greater than the first temperature threshold, then step 1.4 is executed, and if the coolant temperature value is less than or equal to the first temperature threshold, then step 1.2 is returned.
Step 1.4: the ECU 11 determines whether the duration of the coolant temperature value > the first temperature threshold exceeds a first time threshold, if so, the hybrid engine is in a high temperature state, and if not, the hybrid engine is in a normal state.
The first time threshold value can be calibrated during development according to the performance of the hybrid power engine, and preferably, the value range of the first time threshold value is 1-5s. Through the setting of the first time threshold value, the state that the temperature value of the cooling liquid exceeds the first temperature threshold value is ensured to continue for a period of time, so that the misjudgment caused by signal jitter can be avoided.
Step 2: the ECU 11 determines whether the hybrid engine is in a stopped state, if so, executes step 3, and if not, the electronic water pump 9 is not operated.
In the step 2, the method for judging the stop state of the hybrid power engine comprises the following steps:
step 2.1: the engine speed sensor 44 collects a speed signal of the hybrid engine in real time and sends the speed value to the ECU 11.
Step 2.2: the ECU 11 determines whether the rotation speed value is equal to 0, if so, step 2.3 is executed, and if not, the hybrid engine is not in a stopped state.
Step 2.3: the ECU 11 determines whether the duration of the rotation speed value equal to 0 exceeds a second time threshold, if so, the hybrid engine is in a stopped state, and if not, the hybrid engine is not in a stopped state.
The second time threshold value can be calibrated during development according to the performance of the hybrid power engine, and preferably, the value range of the second time threshold value is 1-5s. Through the setting of the second time threshold, the state that the rotating speed value is not 0 is ensured to be continued for a period of time, so that the misjudgment caused by signal jitter can be avoided.
Step 1 and step 2 may be performed simultaneously or sequentially.
And step 3: the ECU 11 judges whether the working condition of the hybrid power engine simultaneously meets a high-temperature state and a stop state, if so, an electronic water pump controller 22 of the electronic water pump control assembly is started to control the electronic water pump 9 to operate, if not, the electronic water pump 9 does not act, and the step 1 is returned. When the electronic water pump 9 runs, cooling liquid of the cylinder cover and the engine body circulates, and a superheat area is cooled, particularly a local superheat area in the cylinder cover water jacket 3.
In the step 3, the method for controlling the electronic water pump 9 to operate by the electronic water pump controller 22 is as follows:
step 3.1: the engine water temperature sensor 33 sends the temperature value of the cooling liquid to the ECU 11 in real time, the engine rotating speed sensor 44 sends the rotating speed value to the ECU 11 in real time, the environment temperature sensor 55 collects an environment temperature signal in real time and sends the environment temperature value to the ECU 11, and the ECU 11 can synthesize the temperature value of the cooling liquid and the environment temperature and accurately adjust the rotating speed of the electronic water pump 9.
Step 3.2: the ECU 11 communicates with the electronic water pump controller 22 in a PWM (Pulse Width Modulation) manner, which has a fast response speed and high reliability. The ECU 11 outputs a PWM duty signal to the electronic water pump controller 22 according to the coolant temperature value and the ambient temperature value.
Step 3.3: in the operation process of the electronic water pump 9, the electronic water pump controller 22 adjusts the rotating speed of the electronic water pump 9 in real time according to the PWM duty cycle signal until the stop condition of the electronic water pump 9 is satisfied.
The rotating speed regulating logic of the electronic water pump 9 is as follows:
when the starting condition of the electronic water pump 9 is not met, namely the working condition of the hybrid power engine does not meet the high-temperature state and the shutdown state at the same time, the PWM duty ratio signal is 10%, and the electronic water pump 9 does not act at the moment.
When the coolant temperature =90 ℃, the PWM duty signal is 13%, and the electronic water pump 9 is operated at the lowest nominal speed (the lowest nominal speed of the electronic water pump 9 is provided by its manufacturer, for example, 1000 rpm).
When the coolant temperature =100 ℃, the PWM duty cycle signal is 85%, and the electronic water pump 9 is operated at the maximum rated rotation speed (the maximum rated rotation speed of the electronic water pump 9 is provided by its manufacturer, for example, 6000 rpm).
When the first temperature threshold is not more than and less than 90 ℃, the PWM duty ratio signal is adjusted by a linear difference value along with the change of the cooling liquid temperature within the range of (10 percent and 13 percent), and the electronic water pump 9 operates according to the lowest calibration rotating speed.
When the temperature of the cooling liquid is higher than 90 ℃ and lower than 100 ℃, the PWM duty ratio signal is linearly adjusted according to the change of the temperature of the cooling liquid within the range of (13 percent and 85 percent), and the rotating speed of the electronic water pump 9 is linearly adjusted according to the change of the PWM duty ratio signal within the range of (1000 revolutions per minute and 6000 revolutions per minute).
When the temperature of the cooling liquid is higher than 100 ℃, the PWM duty ratio signal is adjusted linearly according to the temperature change of the cooling liquid within the range of (85 percent, 100 percent), and the electronic water pump 9 operates according to the highest calibration rotating speed.
When the ambient temperature is more than 50 ℃, the PWM duty ratio signal is additionally increased by 20 percent. If the PWM duty signal exceeds 100%, the output value of the PWM duty signal is 100%.
In the step 3.3, in the process of operating the electronic water pump 9, the ECU 11 monitors the operating state of the electronic water pump 9 through the electronic water pump controller 22, and the operating state monitoring method of the electronic water pump 9 is as follows:
step 3.3.1: the electronic water pump controller 22 acquires an operation state signal of the electronic water pump 9 and judges the operation state of the electronic water pump 9 according to the operation state signal; if the electronic water pump 9 is in a normal running state, the electronic water pump does not act; if the electronic water pump 9 is in a fault state, step 3.3.2 is executed.
The operation state signal of the electronic water pump 9 comprises: input voltage, input current, and coolant temperature.
The fault states of the electronic water pump 9 include abnormal conditions such as overvoltage, undervoltage, overcurrent and overtemperature.
When the input voltage is greater than 32V, the electronic water pump 9 is in overvoltage fault, and when the input voltage is less than 16V, the electronic water pump 9 is in undervoltage fault; when the input current is larger than 12.5A, the electronic water pump 9 has an overcurrent fault; when the temperature of the cooling liquid is more than 140 ℃, the electronic water pump 9 is in an over-temperature fault. The fault recognition of the electronic water pump 9 can be set based on the characteristic functions thereof, and fault recognition functions such as locked rotor and idling can be set as required to ensure the operation safety and stability of the electronic water pump 9.
Step 3.3.2: the electronic water pump controller 22 stops the operation of the electronic water pump 9 and simultaneously feeds back a fault signal of the electronic water pump 9 to the ECU 11, and the ECU 11 feeds back the fault signal to the vehicle meter. The fault information can be displayed by the vehicle instrument to remind a vehicle user, so that the problem of other engine faults caused by the faults of the electronic water pump 9 is avoided, and the electronic water pump 9 is protected.
And 4, step 4: the ECU 11 judges whether the stop condition of the electronic water pump 9 is met, if so, the ECU 11 turns off the electronic water pump 9 through the electronic water pump controller 22, and if not, waits for the stop condition of the electronic water pump 9 to be met.
The shutdown conditions of the electronic water pump 9 include:
(I) The hybrid engine is in a non-stop state.
The method for judging whether the hybrid power engine is in the non-stop state comprises the following steps:
step 4.11: the engine speed sensor 44 collects a speed signal of the hybrid engine in real time and sends the speed value to the ECU 11.
Step 4.12: the ECU 11 determines whether the rotation speed value is greater than 0, if so, step 4.13 is executed, and if not, the hybrid engine is in a stopped state.
Step 4.13: the ECU 11 determines whether the duration of the rotation speed value greater than 0 exceeds a third time threshold, if so, the hybrid engine is in a non-stop state, that is, the hybrid engine is in a running state or an imminent running state, and if not, the hybrid engine is in a stop state.
The third time threshold value can be calibrated during development according to the performance of the hybrid power engine, and preferably, the value range of the third time threshold value is 1-2s. Through the setting of the third time threshold, the state that the rotating speed value is greater than 0 is ensured to be continued for a period of time, so that the misjudgment caused by signal jitter can be avoided.
(II) the hybrid engine is in a non-high temperature state.
The method for judging whether the hybrid power engine is in the non-high temperature state comprises the following steps:
step 4.21: a second temperature threshold is preset in the ECU 11, which may be calibrated at the time of development depending on the performance of the hybrid engine. Preferably, the value range of the second temperature threshold is 85-95 ℃.
Step 4.22: the coolant temperature signal of the hybrid engine is collected in real time by the engine water temperature sensor 33, and the coolant temperature value is sent to the ECU 11.
Step 4.23: the ECU 11 compares the coolant temperature signal with the second temperature threshold, if the coolant temperature value is less than the second temperature threshold, then step 4.24 is executed, and if the coolant temperature value is greater than or equal to the second temperature threshold, then step 4.22 is returned.
Step 4.24: the ECU 11 determines whether the duration of the coolant temperature value being less than the second temperature threshold exceeds a fourth time threshold, if so, the hybrid engine is in a non-high temperature state, and if not, the hybrid engine is in a high temperature state.
The fourth time threshold value can be calibrated during development according to the performance of the hybrid power engine, and preferably, the value range of the fourth time threshold value is 5-10s. Through the setting of the fourth time threshold, the state that the temperature value of the cooling liquid is lower than the fourth temperature threshold is ensured to continue for a period of time, so that the misjudgment caused by signal jitter can be avoided.
(III) the single operation time of the electronic water pump 9 reaches the maximum set time.
The method for judging whether the single running time of the electronic water pump 9 reaches the maximum set time is as follows:
step 4.31: the maximum set time for the operation of the electronic water pump 9 is preset in the ECU 11, preferably, the maximum set time does not exceed 30min, so that the electronic water pump 9 can be prevented from being continuously operated for a long time and being incapable of being turned off due to faults and the like, and the purpose of saving energy is achieved. According to the cooling capacity of the electronic water pump 9 in the prior art, an effective cooling effect can be achieved within 15 minutes generally, and under the working condition that the electronic water pump 9 is not arranged, the cooling liquid can be cooled to be below the boiling point of the cooling liquid after 30 minutes, and at the moment, the local overheating risk cannot occur, so that the maximum set time can be set to be not more than 30 minutes according to needs.
Step 4.32: the ECU 11 records the single running time of the electronic water pump 9, and when the single running time is larger than or equal to the maximum set time, the single running time of the electronic water pump 9 reaches the maximum set time. After the electronic water pump 9 is stopped, the ECU 11 resets the single operation time of the electronic water pump 9 to 0.
When one of the conditions (I), (II), and (III) is satisfied, the ECU 11 determines that the stop condition of the electronic water pump 9 is satisfied, sends the PWM duty signal 10% to the electronic water pump controller 22, and the electronic water pump controller 22 controls the electronic water pump 9 to stop.
Example 1:
the embodiment is applied to a certain type of hybrid engine, and the anti-overheating cooling system of the hybrid engine comprises a mechanical water pump 1, a body water jacket 2, a cylinder cover water jacket 3, a thermostat 4, a radiator 5, an EGR cooler 6, an engine oil cooler 7, a one-way valve 8, an electronic water pump 9, an electronic water pump controller 22, an engine water temperature sensor 33, an engine rotating speed sensor 44 and an ambient temperature sensor 55.
The cylinder cover water jacket 3, the thermostat 4, the mechanical water pump 1 and the engine body water jacket 2 are sequentially connected end to form a small circulating cooling loop of the mechanical water pump. The cylinder cover water jacket 3, the thermostat 4, the radiator 5, the mechanical water pump 1 and the engine body water jacket 2 are sequentially connected end to form a mechanical water pump large circulation cooling loop. The EGR cooler 6 and the engine oil cooler 7 are respectively connected between the water outlet of the mechanical water pump 1 and the water inlet of the engine body water jacket 2. The cylinder cover water jacket 3, the one-way valve 8, the electronic water pump 9 and the engine body water jacket 2 are sequentially connected end to form an electronic water pump cooling loop, and the electronic water pump 9 is controlled to be opened, closed and operated at a speed through an electronic water pump controller 22 through an ECU 11 on a vehicle so as to realize a cooling function when the hybrid power engine is stopped.
When the hybrid power engine is stopped, the control method of the overheating prevention cooling system comprises the following steps:
the first temperature threshold is preset in the ECU 11 to be 90 ℃. The engine water temperature sensor 33 collects a coolant temperature signal of the hybrid engine and sends the coolant temperature value of 95 ℃ to the ECU 11. The duration of the coolant temperature value of 95 ℃ is greater than the first temperature threshold value of 90 ℃ and exceeds a first time threshold value of 5s, and the ECU 11 determines that the hybrid engine is in a high-temperature state. The ambient temperature sensor 55 collects an ambient temperature signal and sends an ambient temperature value of 40 ℃ to the ECU 11. Because the ambient temperature is less than 50 ℃, the PWM duty ratio signal is not additionally increased.
Meanwhile, the engine speed sensor 44 collects a rotational speed signal of the hybrid engine, and sends a rotational speed value 0 to the ECU 11. In the second time threshold value 5s range, the rotation speed value is always 0 and the ecu 11 determines that the hybrid engine is in the stopped state.
The working condition of the hybrid power engine simultaneously meets the high-temperature state and the stop state, the ECU 11 outputs a PWM duty ratio signal of 49% to the electronic water pump controller 22, and the electronic water pump controller 22 starts the electronic water pump 9. The lowest calibration rotating speed of the electronic water pump 9 is 1000 revolutions per minute, the highest calibration rotating speed is 6000 revolutions per minute, the rotating speed of the electronic water pump 9 is adjusted according to the PWM duty ratio signal and the linear difference value, the rotating speed of the electronic water pump 9 is set to 3500 revolutions per minute, so that cooling liquid circularly flows between the cylinder cover water jacket 3 and the engine body water jacket 2, and the purpose of cooling the cylinder cover and the engine body in a shutdown state is achieved.
In the running process of the electronic water pump 9, the rotating speed of the electronic water pump 9 is adjusted in real time according to the temperature of the cooling liquid and the ambient temperature until the electronic water pump 9 meets the shutdown requirement. For example, at some point: the ECU 11 acquires a coolant temperature value of 94 ℃ through the engine water temperature sensor 33, acquires a rotating speed value of 0 through the engine rotating speed sensor 44, acquires an environmental temperature value of 41 ℃ through the environmental temperature sensor 55, outputs a PWM duty ratio signal of 41.8% to the electronic water pump controller 22, and the electronic water pump controller 22 adjusts the running speed of the electronic water pump 9 to 3000 revolutions per minute according to the PWM duty ratio signal.
In the process of operating the electronic water pump 9, the ECU 11 acquires an operating state signal of the electronic water pump 9: the input voltage is 24V, the input current is 7.2A, the temperature of the cooling liquid is 94 ℃, the electronic water pump 9 keeps normal operation, and the electronic water pump controller 22 feeds back the electronic water pump 9 to the ECU 11 in a low level mode without faults.
In the running process of the electronic water pump 9, the ECU 11 acquires that the rotating speed value of the hybrid power engine is more than 0 at 800 rpm, the hybrid power engine is in a running state, the stop condition of the electronic water pump 9 is met, the ECU 11 outputs a PWM duty ratio signal of '10%' to the electronic water pump controller 22, and the electronic water pump controller 22 closes the electronic water pump 9. When the hybrid power engine runs, the cylinder cover water jacket 3 and the engine body water jacket 2 are cooled through the mechanical water pump small circulation cooling loop and the mechanical water pump large circulation cooling loop, and the running mode of the mechanical water pump small circulation cooling loop and the mechanical water pump large circulation cooling loop can be controlled by a traditional mechanical pump, which is not described again here.
Example 2:
the embodiment is applied to a certain type of hybrid engine, and the anti-overheating cooling system of the hybrid engine comprises a mechanical water pump 1, a body water jacket 2, a cylinder cover water jacket 3, a thermostat 4, a radiator 5, an EGR cooler 6, an engine oil cooler 7, a one-way valve 8, an electronic water pump 9, an electronic water pump controller 22, an engine water temperature sensor 33, an engine rotating speed sensor 44 and an ambient temperature sensor 55.
The cylinder cover water jacket 3, the thermostat 4, the mechanical water pump 1 and the engine body water jacket 2 are sequentially connected end to form a small circulating cooling loop of the mechanical water pump. The cylinder cover water jacket 3, the thermostat 4, the radiator 5, the mechanical water pump 1 and the engine body water jacket 2 are sequentially connected end to form a mechanical water pump large circulation cooling loop. The EGR cooler 6 and the engine oil cooler 7 are respectively connected between the water outlet of the mechanical water pump 1 and the water inlet of the engine body water jacket 2. The cylinder cover water jacket 3, the one-way valve 8, the electronic water pump 9 and the engine body water jacket 2 are sequentially connected end to form an electronic water pump cooling loop, and the electronic water pump 9 is controlled to be opened, closed and operated at a speed through an electronic water pump controller 22 through an ECU 11 on a vehicle so as to realize a cooling function when the hybrid power engine is stopped.
When the hybrid power engine is stopped, the control method of the overheating prevention cooling system comprises the following steps:
the first temperature threshold value of 90 ℃ is preset in the ECU 11, the engine water temperature sensor 33 collects a coolant temperature signal of the hybrid engine, and the coolant temperature value of 96 ℃ is sent to the ECU 11. The duration of the coolant temperature value of 96 ℃ greater than the first temperature threshold value of 90 ℃ exceeds a first time threshold value of 5s, and the ECU 11 judges that the hybrid engine is in a high-temperature state. The ambient temperature sensor 55 collects an ambient temperature signal and sends an ambient temperature value of 52 deg.c to the ECU 11. Since the ambient temperature is more than 50 ℃, the PWM signal value needs to be increased by 20 percent additionally.
At the same time, the engine speed sensor 44 collects a speed signal of the hybrid engine and sends a speed value of 0 to the ECU 11. Within the second time threshold value of 5s, the rotation speed value is always 0, and the ECU 11 judges that the hybrid engine is in a stop state.
The working condition of the hybrid power engine simultaneously meets the high-temperature state and the shutdown state, the ECU 11 outputs a PWM duty ratio signal of 56.2% +20% "to the electronic water pump controller 22, and the electronic water pump controller 22 starts the electronic water pump 9. The lowest calibration rotating speed of the electronic water pump 9 is 1000 revolutions per minute, the highest calibration rotating speed is 6000 revolutions per minute, the rotating speed of the electronic water pump 9 is adjusted according to the PWM duty ratio signal and the linear difference value, the rotating speed of the electronic water pump 9 is set to 5390 revolutions per minute, so that cooling liquid circularly flows between the cylinder cover water jacket 3 and the engine body water jacket 2, and the purpose of cooling the cylinder cover and the engine body in a shutdown state is achieved.
In the running process of the electronic water pump 9, the rotating speed of the electronic water pump 9 is adjusted in real time according to the temperature of the cooling liquid and the ambient temperature until the electronic water pump 9 meets the shutdown requirement. For example, at some point: the ECU 11 acquires a coolant temperature value of 95 ℃ through the engine water temperature sensor 33, acquires a rotating speed value of 0 through the engine rotating speed sensor 44, acquires an environment temperature value of 51 ℃ through the environment temperature sensor 55, and sends a calculated PWM duty ratio signal of '69%' to the electronic water pump controller 22, and the electronic water pump controller 22 adjusts the running speed of the electronic water pump 9 to 4890 revolutions per minute according to the PWM duty ratio signal.
In the process of the operation of the electronic water pump 9, the electronic water pump controller 22 acquires an operation state signal of the electronic water pump 9: the input voltage signal of the electronic water pump 9 is 15V, the electronic water pump controller 22 judges that the electronic water pump 9 is under-voltage fault, the electronic water pump 9 stops running, meanwhile, the fault signal of the electronic water pump 9 is fed back to the ECU 11 in a high-level mode, and the ECU 11 feeds back the fault signal to a vehicle instrument. Accessible vehicle instrument shows fault information for remind the vehicle user in time to handle the trouble problem, thereby avoid the other engine trouble problems that lead to because of the electronic water pump 9 trouble, realize the protection to electronic water pump 9.
When the hybrid power engine runs, the cylinder cover water jacket 3 and the engine body water jacket 2 are cooled through the mechanical water pump small circulation cooling loop and the mechanical water pump large circulation cooling loop, and the running mode of the mechanical water pump small circulation cooling loop and the mechanical water pump large circulation cooling loop can be controlled by a traditional mechanical pump, which is not described again here.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A control method of an anti-overheating cooling system of a hybrid power engine is characterized by comprising the following steps: the control method is realized based on an anti-overheating cooling system of a hybrid power engine, and the anti-overheating cooling system of the hybrid power engine comprises a mechanical water pump small circulation cooling loop formed by sequentially connecting a cylinder cover water jacket (3), a thermostat (4), a mechanical water pump (1) and a machine body water jacket (2) end to end, a mechanical water pump large circulation cooling loop formed by sequentially connecting the cylinder cover water jacket (3), the thermostat (4), a radiator (5), the mechanical water pump (1) and the machine body water jacket (2) end to end, and a cooling assembly connected between a water outlet of the mechanical water pump (1) and a water inlet of the machine body water jacket (2); the anti-overheating cooling system of the hybrid power engine further comprises a one-way valve (8), an electronic water pump (9) and an electronic water pump control assembly; the water outlet of the cylinder cover water jacket (3) is communicated with the water inlet of the one-way valve (8), the water outlet of the one-way valve (8) is communicated with the water inlet of the electronic water pump (9), the water outlet of the electronic water pump (9) is communicated with the water inlet of the engine body water jacket (2), and the water outlet of the engine body water jacket (2) is communicated with the water inlet of the cylinder cover water jacket (3) to form an electronic water pump cooling loop; the control end of the electronic water pump (9) is electrically connected with the electronic water pump control assembly, and the electronic water pump control assembly is externally connected with an ECU (11);
the electronic water pump control assembly comprises an electronic water pump controller (22), an engine water temperature sensor (33), an engine rotating speed sensor (44) and an ambient temperature sensor (55); the output ends of the engine water temperature sensor (33), the engine rotating speed sensor (44) and the environment temperature sensor (55) are respectively connected with the input end of the ECU (11), and the output end of the ECU (11) is connected with the electronic water pump (9) through the electronic water pump controller (22);
the engine water temperature sensor (33) is arranged at a water outlet of a cylinder cover of the hybrid power engine; the engine speed sensor (44) is arranged on a crankshaft of the hybrid engine; the environment temperature sensor (55) is arranged on the vehicle and is far away from the hybrid power engine;
the control method comprises the following steps:
step 1: the ECU (11) judges whether the hybrid power engine is in a high-temperature state, if so, the step 3 is executed, and if not, the electronic water pump (9) does not act;
the method for judging the high-temperature state of the hybrid power engine comprises the following steps:
step 1.1: presetting a first temperature threshold in an ECU (11);
step 1.2: coolant temperature signals of the hybrid power engine are acquired in real time through an engine water temperature sensor (33), and the coolant temperature values are sent to an ECU (11);
step 1.3: the ECU (11) compares the coolant temperature signal with a first temperature threshold, if the coolant temperature value is greater than the first temperature threshold, the step 1.4 is executed, and if the coolant temperature value is less than or equal to the first temperature threshold, the step 1.2 is returned;
step 1.4: the ECU (11) judges whether the duration time of the temperature value of the cooling liquid being larger than a first temperature threshold value exceeds a first time threshold value, if so, the hybrid engine is in a high-temperature state, and if not, the hybrid engine is in a normal state;
and 2, step: the ECU (11) judges whether the hybrid power engine is in a stop state, if so, the step 3 is executed, and if not, the electronic water pump (9) does not act;
the method for judging the stop state of the hybrid power engine comprises the following steps:
step 2.1: the method comprises the steps that a rotating speed signal of the hybrid power engine is collected in real time through an engine rotating speed sensor (44), and a rotating speed value is sent to an ECU (11);
step 2.2: the ECU (11) judges whether the rotating speed value is equal to 0, if so, step 2.3 is executed, and if not, the hybrid engine is not in a stop state;
step 2.3: the ECU (11) judges whether the duration time of the rotating speed value equal to 0 exceeds a second time threshold value, if so, the hybrid engine is in a stop state, and if not, the hybrid engine is not in the stop state;
and step 3: the ECU (11) judges whether the working condition of the hybrid power engine simultaneously meets a high-temperature state and a stop state, if so, the electronic water pump controller (22) is started to control the electronic water pump (9) to operate, if not, the electronic water pump (9) does not operate, and the step 1 is returned;
and 4, step 4: the ECU (11) judges whether the stop condition of the electronic water pump (9) is met, if so, the ECU (11) closes the electronic water pump (9) through an electronic water pump controller (22), and if not, the ECU waits for the stop condition of the electronic water pump (9) to be met;
the shutdown conditions of the electronic water pump (9) comprise:
(I) The hybrid engine is in a non-stop state;
(II) the hybrid engine is in a non-high temperature state;
(III) the single running time of the electronic water pump (9) reaches the maximum set time;
when one of the above conditions (I), (II), and (III) is satisfied, the electronic water pump (9) is considered to have a stop condition satisfied.
2. The control method according to claim 1, wherein: in the step 3, the method for controlling the electronic water pump (9) to operate by the electronic water pump controller (22) comprises the following steps:
step 3.1: the engine water temperature sensor (33) sends the temperature value of the cooling liquid to the ECU (11) in real time, the engine rotating speed sensor (44) sends the rotating speed value to the ECU (11) in real time, and the environment temperature sensor (55) collects an environment temperature signal in real time and sends the environment temperature value to the ECU (11);
step 3.2: the ECU (11) is communicated with the electronic water pump controller (22) in a PWM (pulse-width modulation) mode, and the ECU (11) outputs a PWM duty ratio signal to the electronic water pump controller (22) according to the temperature value of the cooling liquid and the ambient temperature value;
step 3.3: in the running process of the electronic water pump (9), the electronic water pump controller (22) adjusts the rotating speed of the electronic water pump (9) in real time according to the PWM duty ratio signal until the stop condition of the electronic water pump (9) is met;
the rotating speed regulating logic of the electronic water pump (9) is as follows:
when the starting condition of the electronic water pump (9) is not met, namely the working condition of the hybrid power engine does not meet the high-temperature state and the shutdown state at the same time, the PWM duty ratio signal is 10%, and the electronic water pump (9) does not act at the moment;
when the temperature of the cooling liquid is =90 ℃, the PWM duty ratio signal is 13%, and the electronic water pump (9) operates according to the lowest calibrated rotating speed;
when the temperature of the cooling liquid is =100 ℃, the PWM duty ratio signal is 85%, and the electronic water pump (9) operates according to the highest calibration rotating speed;
when the first temperature threshold value is less than or equal to the temperature of the cooling liquid and less than 90 ℃, the PWM duty ratio signal is subjected to linear difference adjustment along with the change of the temperature of the cooling liquid within the range of (10 percent and 13 percent), and the electronic water pump (9) operates according to the lowest calibrated rotating speed;
when the temperature of the cooling liquid is higher than 90 ℃ and lower than 100 ℃, the PWM duty ratio signal is subjected to linear difference adjustment along with the change of the temperature of the cooling liquid within the range of (13 percent and 85 percent), and the rotating speed of the electronic water pump (9) is subjected to linear difference adjustment along with the change of the PWM duty ratio signal within the range of (1000 revolutions per minute and 6000 revolutions per minute);
when the temperature of the cooling liquid is higher than 100 ℃, the PWM duty ratio signal is subjected to linear difference adjustment along with the temperature change of the cooling liquid within the range of (85 percent, 100 percent), and the electronic water pump (9) operates according to the highest calibration rotating speed;
when the ambient temperature is higher than 50 ℃, the PWM duty ratio signal is additionally increased by 20%;
if the PWM duty signal exceeds 100%, the output value of the PWM duty signal is 100%.
3. The control method according to claim 2, wherein: in the step 3.3, in the process of operating the electronic water pump (9), the ECU (11) monitors the operating state of the electronic water pump (9) through the electronic water pump controller (22), and the operating state monitoring method of the electronic water pump (9) is as follows:
step 3.3.1: the electronic water pump controller (22) collects the running state signal of the electronic water pump (9), and judges the running state of the electronic water pump (9) according to the running state signal; if the electronic water pump (9) is in a normal running state, the electronic water pump does not act; if the electronic water pump (9) is in a fault state, executing the step 3.3.2;
the running state signal of the electronic water pump (9) comprises: input voltage, input current, and coolant temperature; the fault states of the electronic water pump (9) comprise overvoltage, undervoltage, overcurrent and overtemperature;
step 3.3.2: the electronic water pump controller (22) stops the operation of the electronic water pump (9), meanwhile, a fault signal of the electronic water pump (9) is fed back to the ECU (11), and the ECU (11) feeds back the fault signal to a vehicle instrument.
4. The control method according to claim 1, wherein: in the step 4, the method for judging whether the hybrid power engine is in the non-stop state comprises the following steps:
step 4.11: the method comprises the steps that a rotating speed signal of the hybrid power engine is collected in real time through an engine rotating speed sensor (44), and a rotating speed value is sent to an ECU (11);
step 4.12: the ECU (11) judges whether the rotating speed value is greater than 0, if so, the step 4.13 is executed, and if not, the hybrid engine is in a stop state;
step 4.13: and the ECU (11) judges whether the duration time of the rotating speed value which is greater than 0 exceeds a third time threshold value, if so, the hybrid engine is in a non-stop state, and if not, the hybrid engine is in a stop state.
5. The control method according to claim 1, wherein: in the step 4, the method for judging that the hybrid power engine is in the non-high temperature state comprises the following steps:
step 4.21: presetting a second temperature threshold in the ECU (11);
step 4.22: the method comprises the steps that a coolant temperature signal of the hybrid power engine is collected in real time through an engine water temperature sensor (33), and the coolant temperature value is sent to an ECU (11);
step 4.23: the ECU (11) compares the coolant temperature signal with a second temperature threshold, if the coolant temperature value is less than the second temperature threshold, the step 4.24 is executed, and if the coolant temperature value is more than or equal to the second temperature threshold, the step 4.22 is returned;
step 4.24: and the ECU (11) judges whether the duration time of the coolant temperature value less than the second temperature threshold exceeds a fourth time threshold, if so, the hybrid engine is in a non-high temperature state, and if not, the hybrid engine is in a high temperature state.
6. The control method according to claim 1, wherein: in the step 4, the method for judging whether the single running time of the electronic water pump (9) reaches the maximum set time is as follows:
step 4.31: presetting the maximum set time of the operation of the electronic water pump (9) in an ECU (11);
step 4.32: the ECU (11) records the single running time of the electronic water pump (9), and when the single running time is more than or equal to the maximum set time, the single running time of the electronic water pump (9) reaches the maximum set time; after the electronic water pump (9) is stopped, the ECU (11) resets the single operation time of the electronic water pump (9) to 0.
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