CN115217938A - Rapid heat engine control method of transmission - Google Patents
Rapid heat engine control method of transmission Download PDFInfo
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- CN115217938A CN115217938A CN202111122898.6A CN202111122898A CN115217938A CN 115217938 A CN115217938 A CN 115217938A CN 202111122898 A CN202111122898 A CN 202111122898A CN 115217938 A CN115217938 A CN 115217938A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 193
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 94
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000012544 monitoring process Methods 0.000 claims description 13
- 239000003921 oil Substances 0.000 description 119
- 125000000205 L-threonino group Chemical group [H]OC(=O)[C@@]([H])(N([H])[*])[C@](C([H])([H])[H])([H])O[H] 0.000 description 25
- 239000000498 cooling water Substances 0.000 description 14
- 239000010705 motor oil Substances 0.000 description 11
- 238000011217 control strategy Methods 0.000 description 3
- 239000000110 cooling liquid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000013486 operation strategy Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
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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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
- F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
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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
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
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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
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
- F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
- F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Details Of Gearings (AREA)
Abstract
A quick heat engine control method of a transmission is used for being matched with a cooling system to perform quick heat engine of the transmission, wherein the cooling system comprises a temperature control module and a three-way valve, the temperature control module is connected with a warm air core branch, a transmission oil cooler branch and the three-way valve, and the three-way valve is connected with the warm air core branch, the transmission oil cooler branch and a radiator branch.
Description
Technical Field
The invention relates to the technical field of engine cooling systems, in particular to a quick heat engine control method of a transmission.
Background
The scheme of a cooling system used for a finished automobile on the market at present is usually based on a mechanical water pump and a thermostat, the thermostat is used for adjusting a large circulation branch and a bypass small circulation branch of a radiator, the small circulation branch is hot water which does not pass through the radiator, cooling liquid of the large circulation branch which does not pass through the radiator is also the hot water, the water temperature of the part can reach 90-105 ℃ when the part is used conventionally, and the water temperature of the cooling liquid of the large circulation branch which passes through the radiator for radiating is about 10 ℃ lower than that of the cooling liquid, and is generally about 75-90 ℃.
In the cooling system with the form, when the temperature of engine water is high and the radiator is normally open, water flows in the oil-cooled inner part of the transmission, and the transmission can be cooled. However, in the cold starting process, all heat is locked in the engine to produce temperature rise, and the transmission cannot be heated before the water temperature reaches a higher level, so that the viscosity of engine oil is often higher, the friction level of the transmission is at a higher level, the phenomenon of friction waste exists, and the performance and the oil saving effect of the transmission are influenced to a certain extent.
Disclosure of Invention
In view of the above, the present invention provides a rapid thermal engine control method of a transmission capable of reducing friction loss of an engine and the transmission.
The quick heat engine control method of the transmission is used for being matched with a cooling system to carry out quick heat engine of the transmission, the cooling system comprises a temperature control module and a three-way valve, the temperature control module is connected with a warm air core body branch, a transmission oil cooler branch and the three-way valve, and the three-way valve is connected with the warm air core body branch, the transmission oil cooler branch and a radiator branch.
The invention relates to a method for controlling a rapid heat engine of a transmission, comprising the following steps:
during cold start, the water temperature of the system is monitored:
if the water temperature is lower than the warm air response threshold and the water temperature is lower than the transmission response threshold, controlling the temperature control module to enter a quick engine heating mode of the engine;
if the water temperature is not lower than a warm air response threshold and the system has a warm air demand, controlling the temperature control module to open a warm air core branch and controlling the three-way valve to adjust to the positions of opening the warm air core branch, opening the transmission oil cooler branch and closing the radiator branch;
if the water temperature exceeds the response threshold value of the transmission, the three-way valve is controlled to be adjusted to the positions of opening of the oil cooler branch of the transmission and closing of the radiator branch;
and if the water temperature exceeds the heat engine threshold value of the engine, controlling the opening degree of the temperature control module and the rotating speed of the cooling fan according to the water temperature.
Further, still include:
reading the rotating speed of the engine;
judging the state of the engine according to the rotating speed of the engine and the water temperature;
when the engine is in a working state, the opening of the temperature control module and the rotating speed of the cooling fan are controlled according to the water temperature.
Further, the opening of the temperature control module and the rotating speed of the cooling fan are calibrated values obtained by looking up a table according to the current rotating speed and load of the engine.
Further, when the opening degree of the temperature control module is controlled according to the water temperature, the opening degree of the temperature control module is associated with the water temperature, and the higher the water temperature is, the larger the opening degree of the temperature control module is.
Further, the quick heat engine control method of the transmission further comprises the steps of monitoring the oil temperature when the water temperature exceeds the engine heat engine threshold value, and judging whether the transmission heat engine is finished or not according to the oil temperature, wherein the method comprises the following steps:
monitoring the oil temperature of the transmission:
if the water temperature exceeds the engine heat engine threshold value and the oil temperature is lower than the first transmission heat engine threshold value, the lower limit of the opening degree of the temperature control module is restricted, the temperature control module at least opens the warm air core branch and the transmission oil cooler branch, and the three-way valve is adjusted to the positions of opening the warm air core branch, opening the transmission oil cooler branch and closing the radiator branch;
and if the oil temperature exceeds a first transmission heat engine threshold value, indicating that the engine heat engine and the transmission heat engine are both finished, and setting the opening degree of the temperature control module according to the water temperature.
Further, the method for controlling the rapid heat engine of the transmission also controls the opening degree of the temperature control module and the rotating speed of the cooling fan by monitoring the real-time oil temperature during cold start, and comprises the following steps:
monitoring the oil temperature of the transmission:
if the oil temperature exceeds a second transmission heat engine threshold value, the temperature control module at least opens the warm air core branch, and the three-way valve is adjusted to the positions of opening the warm air core, opening the transmission oil cooler branch and closing the radiator branch;
if the oil temperature exceeds a heat engine threshold value of a third transmission, the temperature control module at least opens a radiator branch, and the three-way valve is adjusted to the positions of closing the warm air core, opening the transmission oil cooler branch and opening the radiator branch;
and if the oil temperature exceeds a heat engine threshold value of the fourth transmission, the cooling fan is turned on.
Further, the first transmission heat engine threshold, the second transmission heat engine threshold, the third transmission heat engine threshold, and the fourth transmission heat engine threshold are calibrated values, wherein the fourth transmission heat engine threshold is greater than the third transmission heat engine threshold, the third transmission heat engine threshold is greater than the second transmission heat engine threshold, and the second transmission heat engine threshold is greater than the first transmission heat engine threshold.
Further, when the opening of the temperature control module and the rotating speed of the cooling fan are controlled during cold starting by monitoring real-time oil temperature, the opening of the temperature control module is related to the oil temperature, and the opening of the temperature control module is larger when the oil temperature is higher; the cooling fan speed is related to the oil temperature, and the higher the oil temperature, the higher the cooling fan speed.
Further, in the engine rapid heat engine mode, the temperature control module is controlled to execute one of the following strategies:
the temperature control module is fully closed, so that all branches including the warm air core branch, the transmission oil cooler branch and the radiator branch are completely closed, and the flow in the system is zero;
the temperature control module slightly opens the small circulation branch, and other branches are all closed;
the temperature control module intermittently toggles between on and off modes.
Further, the warm air response threshold, the transmission response threshold, and the engine heat engine threshold are calibrated values.
According to the rapid heat engine control method of the transmission, the on-off of the warm air core branch, the transmission oil cooler branch and the radiator branch is controlled by controlling the temperature control module and the three-way valve, and the heat engine speed of the transmission can be accelerated on the premise that the heating of an engine is not influenced in a cold start stage, so that the friction loss of the engine and the transmission is reduced simultaneously, the friction waste phenomenon is reduced, and the oil consumption of a power assembly system is reduced.
Drawings
FIG. 1 is a schematic diagram of an engine system employing a method of rapid thermal engine control of a transmission provided in accordance with the present invention.
Fig. 2 is a flow chart illustrating a method for controlling a rapid thermal engine of a transmission according to the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1, an engine system based on the method for controlling a fast heat engine of a transmission according to the present invention at least includes an engine, a transmission, a supercharger, an expansion tank and a cooling system, where the cooling system at least includes an electronic water pump, an engine oil cooler, a radiator, a water temperature sensor, an oil temperature sensor, a transmission oil cooler, a warm air core, a temperature control module and a three-way valve, where the transmission oil cooler, the warm air core and the radiator are respectively located on a transmission oil cooler branch, a warm air core branch and a radiator branch, the temperature control module is connected to the warm air core branch, the transmission oil cooler branch and the three-way valve for controlling cooling water to enter the warm air core branch, the transmission oil cooler branch and the three-way valve, the three-way valve is located between the warm air core branch and the transmission oil cooler branch and the radiator branch for controlling on/off of the transmission oil cooler branch and the radiator branch, a solid line in fig. 1 shows a flow direction circulation of cooling water, a dotted line shows a flow direction circulation of cooling water, and a flow direction of cooling water may be performed.
The input signals of the rapid heat engine control method comprise a water temperature T _ clt, an oil temperature T _ oil, an engine speed engspd, a load, a warm air response threshold T _ clt _ thres _ htr, a heat engine threshold T _ clt _ warp _ end, a first transmission heat engine threshold T _ oil _ thres _ trans0, a second transmission heat engine threshold T _ oil _ thres _ trans1, a third transmission heat engine threshold T _ oil _ thres _ trans2 and a fourth transmission heat engine threshold T _ oil _ thres _ trans3, and output signals comprise a temperature control module opening TMM _ pos, a heat dissipation Fan speed Fan _ spd and a lower opening limit M _ pos _ min of the temperature control module.
Referring to fig. 2, the method for controlling a fast heat engine according to the present invention performs closed-loop control on the opening TMM _ pos of the temperature control module and the rotation speed Fan _ spd of the cooling Fan during cold start by monitoring the real-time water temperature T _ clt, and includes the following steps:
step S1: EMS (Engine Management System) carries out fault detection on the cooling System, if a fault is detected, the EMS alarms and limits the speed of the Engine, the EMS inputs a maximum opening signal to the temperature control module, and if the fault is not detected, the step S2 is carried out;
specifically, after the whole vehicle is powered on, the engine management system EMS starts to perform self-checking, and the self-checking mainly checks the state of the temperature control module. The temperature control module carries out self-learning of a fully closed position after being started, if the temperature control module is stuck in the fully closed position, the whole system is closed and the flow of cooling water is lost, the engine may have overheating risks, and because internal hot water cannot flow to the outside, an external sensor cannot correctly sense the internal hot water and cannot effectively monitor, and therefore when faults such as sticking and the like occur, the engine speed limit knob is required to protect the engine.
Step S2: the EMS carries out fault detection on the water temperature sensor, if the fault is detected, the EMS alarms, the temperature control module is fully opened, the cooling fan is opened at the same time, the overheating of the engine is avoided, and if the fault is not detected, the step S3 is carried out;
specifically, the temperature control module starts to judge whether the water temperature sensor fails after normal self-checking, if the water temperature sensor fails, the EMS alarms, and outputs a signal that the temperature control module is opened to full open, so that the capacity of the cooling system is completely released, and overheating of the engine is avoided.
And step S3: reading the engine rotation speed engspd and the current water temperature T _ clt by the EMS, judging the state of the engine according to the engine rotation speed and the current water temperature, if the engine is in a working state, controlling the opening TMM _ pos of a temperature control module and the rotation speed Fan _ spd of a cooling Fan according to the water temperature T _ clt, and if the engine is in a cold starting state, entering the step S4;
specifically, the EMS can directly read the current water temperature T _ clt from the water temperature sensor, when the engine is judged to be in the working state, the engine rotation speed engspd needs to be read, if the variable is not zero and the water temperature T _ clt is not lower than a set threshold, the engine is in the running state, then different target water temperatures are set based on the water temperature T _ clt and an existing related control strategy in the engine, namely a conventional operation strategy of a cooling system, and the temperature control module opening TMM _ pos and the cooling Fan rotation speed Fan _ spd are calculated and then output.
And step S4: during the cold start of the vehicle, the EMS monitors the water temperature T _ clt:
if the water temperature T _ clt is below the warm air response threshold T _ clt _ thres _ htr and the water temperature T _ clt is below the transmission response threshold T _ clt _ thres _ trans, the temperature control module enters the engine rapid heat engine mode;
if the water temperature T _ clt is not lower than a warm air response threshold T _ clt _ thres _ htr in a low-temperature environment with warm air demand, the warm air core branch is opened by the temperature control module, the three-way valve is adjusted to the positions of opening the warm air core branch, opening the transmission oil cooler branch and closing the radiator branch, and cooling water enters the water pump through the temperature control module, the warm air core, the three-way valve and the transmission oil cooler.
If the water temperature T _ clt exceeds a transmission response threshold T _ clt _ thres _ trans, the three-way valve is adjusted to the position where a transmission oil cooler branch is opened and a radiator branch is closed, cooling water enters a water pump through a temperature control module, the three-way valve and the transmission oil cooler, and the temperature control module determines whether part of the cooling water enters a warm air core for heating according to whether warm air needs exist;
specifically, during a cold start, the heating requirements of the engine system may be divided into several levels:
a first heating stage: firstly, the wall surface of the engine rapidly rises in temperature and enters a combustion optimal state, the process can be ended within tens of seconds generally, and the water temperature is about 30-40 ℃;
a second heating stage: in the engine oil temperature rise process, the viscosity of the engine oil is high at low temperature, so that the friction loss is high, and the engine oil is easy to dilute, so that the engine oil needs to be heated quickly to reach a proper temperature, and the water temperature is about 80 ℃;
after the first heating stage and the second heating stage are completed, the whole engine reaches relatively ideal conditions, if the heating condition of the transmission is not considered, the water temperature is continuously increased to 90 ℃, and the cooling system can enter a closed-loop control process.
However, in the heating stage, in order to lock all heat inside the engine to produce temperature rise, the transmission branch is not opened all the time, the oil inside the transmission is still in a supercooled state, the viscosity of the oil is high, and the transmission is used as a mechanical moving part and has the problem of high friction loss.
On one hand, the engine is used as an output source of power, friction loss of the engine occupies a higher proportion in a transmission system of a finished automobile, the importance of the engine is higher than that of a transmission, on the other hand, the engine oil in the engine is diluted mainly due to the fact that the engine oil is wet by the wall of the low-temperature gasoline, and the problem does not exist in the transmission, so the engine oil temperature rise of the engine needs to be prior to the engine oil temperature rise of the transmission, and the engine oil temperature rise of the transmission needs to be preferentially guaranteed after rising to a certain level.
In addition to the above heating requirements, the warm air requirement under the ultra-low temperature environment needs to be additionally considered during cold start. When warm air is needed, once the water temperature reaches a proper level, the system opens a warm air branch to improve the comfort of a passenger compartment and provide defrosting capacity, and the warm air core body is connected with the speed changer in series, so the speed changer can be heated.
It is easy to understand that since the total amount of heat is fixed, if the warm air divides a part of the heat, the heat engine process of the engine is affected, and the emission and the oil consumption are increased, since the warm air demand is generally only in the low temperature environment and the response to the warm air needs to be as early as possible for the comfort, the oil consumption and the emission are not the main consideration. However, in summer or in a high-temperature environment, the user usually does not activate the warm air demand, and even if the warm air demand exists, the user does not need to respond to the warm air demand in advance, so that the oil consumption and the emission problem should be guaranteed preferentially, and the warm air is provided for the user when the overall water temperature level rises to a high value. That is, there is a difference in the time required to blow the hot passenger compartment after the user activates the warm air demand in summer and winter.
The control strategy of the rapid thermal engine control method of the transmission of the invention during cold start is therefore as follows:
if the water temperature T _ clt is below the warm air response threshold T _ clt _ thres _ htr and the water temperature T _ clt is below the transmission response threshold T _ clt _ thres _ trans, the temperature control module enters a fast heat engine mode, focusing only on the fast heat engine of the engine itself. The quick heat engine mode is an engine quick heating strategy and comprises an EMS control temperature control module for executing one of the following three strategies:
1) The temperature control module is completely closed, all branches including the warm air core branch, the transmission oil cooler branch and the radiator branch are completely closed, zero flow is generated in the system, under the mode, the internal heating speed is extremely high, but because cooling water does not flow, internal hot water cannot flow to the outside, and an external sensor cannot read the internal water temperature, so that the state is dangerous, and if the sensor is arranged in the system, the scheme can be used;
2) The temperature control module slightly opens the small circulation branch, and other branches are all closed, which is a common scheme;
3) The temperature control module intermittently switches back and forth in an on-off mode, the inside is rapidly heated when the temperature control module is turned off, and cooling water flows to the outside when the temperature control module is turned on, so that the outside can intermittently monitor the water temperature in the inside.
If the water temperature T _ clt exceeds a transmission response threshold T _ clt _ thres _ trans, the three-way valve is adjusted to the position where a transmission oil cooler branch is opened and a radiator branch is closed, cooling water enters a water pump through a temperature control module, the three-way valve and the transmission oil cooler, and the temperature control module determines whether part of the cooling water enters a warm air core for heating according to whether warm air needs exist;
if the engine is in a low-temperature environment with warm air demand, and the water temperature T _ clt is not lower than a warm air response threshold T _ clt _ thres _ htr, the temperature control module opens the warm air core branch, the three-way valve is adjusted to the positions of opening the warm air core branch, opening the transmission oil cooler branch and closing the radiator branch, the transmission is heated by hot water in the engine, and cooling water enters the water pump through the temperature control module, the warm air core, the three-way valve and the transmission oil cooler.
In the present embodiment, the warm air response threshold T _ clt _ thres _ htr and the transmission response threshold T _ clt _ thres _ trans in step S4 are calibrated values, the temperature control module opening TMM _ pos is set to be associated with the water temperature T _ clt, the temperature control module opening TMM _ pos is obtained by looking up a table through the water temperature T _ clt, and the higher the water temperature T _ clt is, the larger the temperature control module opening TMM _ pos is.
Step S5: in the process of executing the step S4, the EMS monitors the water temperature T _ clt, and if the water temperature T _ clt exceeds the engine heat engine threshold T _ clt _ warm _ end, it indicates that the engine heat engine has ended, and controls the temperature control module opening TMM _ pos and the radiator Fan rotation speed Fan _ spd according to the water temperature T _ clt.
In the present embodiment, the heat engine threshold T _ clt _ warmup _ end in step S5 is a calibrated value.
Further, the method for controlling the rapid heat engine of the transmission further comprises the steps of monitoring the oil temperature T _ oil when the heat engine of the engine is finished, and judging whether the heat engine of the transmission is finished or not through the oil temperature T _ oil, wherein the method comprises the following steps:
step S6: in the process of performing step S4, the EMS monitors the oil temperature T _ oil of the transmission:
if the water temperature T _ clt exceeds an engine heat engine threshold value T _ clt _ sumup _ end and the oil temperature T _ oil of the transmission is lower than a first transmission heat engine threshold value T _ oil _ thres _ trans0, then restricting a lower opening limit TMM _ pos _ min of a temperature control module, opening at least a warm air core branch and a transmission oil cooler branch by the temperature control module, and adjusting a three-way valve to the positions of opening the warm air core branch, opening the transmission oil cooler branch and closing a radiator branch;
if the oil temperature T _ oil exceeds the first transmission heat engine threshold T _ oil _ thres _ trans0, indicating that both the engine heat engine and the transmission heat engine have ended, the temperature control module opening TMM _ pos is controlled according to the water temperature T _ clt.
Specifically, the opening degree of the temperature control module may be changed to a position with a larger opening degree or a position with a smaller opening degree under the action of closed-loop control, for example: the warm air branch is not opened below 30% of the opening of the temperature control module, and once the warm air branch needs to be opened, the opening of the temperature control module can reach more than 30%. Thus, as some branches are opened or closed, the opening of the temperature control module may be set to a minimum value, thereby causing other transmission problems. At the same time, it is still determined whether the transmission oil temperature exceeds the first transmission heat engine threshold T _ oil _ thres _ trans0, considering that the transmission oil temperature may not have reached the desired level. If the transmission oil temperature T _ oil is still lower than the value, the lower opening limit TMM _ pos _ min of the temperature control module is restricted, namely, no matter what the effect of closed-loop control is, the temperature control module is required to at least ensure that the warm air core branch and the transmission oil cooler branch are opened, and meanwhile, the three-way valve is required to be matched with the temperature control module to be adjusted to the positions that the warm air core branch is opened, the transmission oil cooling branch is opened, but the radiator branch is closed. If the oil temperature T _ oil exceeds the first transmission heat engine threshold T _ oil _ thres _ trans0, then both the engine heat engine and the transmission heat engine are finished.
Further, the method for controlling the rapid heat engine of the transmission further controls the opening degree TMM _ pos of the temperature control module and the rotating speed Fan _ spd of the cooling Fan by monitoring the real-time oil temperature T _ oil of the transmission during cold start, and comprises the following steps:
step S7: in the process of performing step S4, the EMS monitors the oil temperature T _ oil of the transmission:
if the oil temperature T _ oil exceeds a second transmission heat engine threshold value T _ oil _ thres _ trans1, the temperature control module at least opens the warm air core branch, and the three-way valve is adjusted to the positions of opening the warm air core, opening the transmission oil cooler branch and closing the radiator branch;
if the oil temperature T _ oil exceeds a third transmission heat engine threshold value T _ oil _ thres _ trans2, the temperature control module at least opens a radiator branch, the three-way valve is adjusted to the positions of the closed warm air core body, the opened transmission oil cooler branch and the opened radiator branch, and cooling water enters the water pump through the temperature control module, the transmission oil cooler and the radiator;
if the oil temperature T _ oil exceeds the fourth transmission heat engine threshold T _ oil _ thres _ trans3, the radiator fan is turned on.
Specifically, after the engine and the transmission complete the heat engine process, the cooling capacity of the cooling system should be adjusted to mainly adjust the water temperature of the engine, and the water temperature is adjusted in a closed loop according to the requirements of different working conditions of the engine.
Under normal temperature and overheat environment, when the water temperature and the oil temperature of the engine are higher, the oil temperature of the transmission is also higher, and under the low-temperature working condition of a cold region, when the water temperature and the oil temperature of the engine are lower, the oil temperature of the transmission is also lower. When the temperature levels of the two are advanced and retreated together and the requirements are unified, the control strategy of the temperature control module is unified and problems can not be encountered.
However, under the special working condition of-20 ℃ to 10 ℃, the triggering requirement is not uniform, for example, when the vehicle is blocked on a long slope in a low-temperature environment, the transmission is in a sliding state for a long time, the oil temperature of the transmission is rapidly increased, but the working condition of the engine is still insufficient to support the water temperature, and the water temperature is at a lower level. Under such operating conditions, when the oil temperature of the transmission triggers the temperature control module to be opened to a large opening degree, because the heat exchange capacity of the engine is enhanced, the water temperature suddenly drops, after the oil temperature of the transmission drops, the temperature control module recovers to a small opening degree, the water temperature rises again, and therefore cold and hot impact occurs to the future, and the engine and the transmission are not favorable.
Therefore, the cooling performance supply can be divided into three grades based on the collocation condition of the temperature control module and the three-way valve:
if the oil temperature T _ oil exceeds a second transmission heat engine threshold value T _ oil _ thres _ trans1, the temperature control module opens a warm air core branch, and the three-way valve is matched with the temperature control module to open a transmission oil cooler branch so as to ensure that the flow in the transmission oil cooler is ensured, but the radiator branch is not opened;
if the oil temperature T _ oil exceeds a third transmission heat engine threshold value T _ oil _ thres _ trans2, the temperature control module opens the radiator branch, and the three-way valve cooperates with the temperature control module to open the transmission oil cooler branch and the radiator branch, so that the flow in the transmission oil cooler branch is ensured, and the flow in the radiator branch is also ensured;
if the oil temperature T _ oil exceeds a fourth transmission heat engine threshold value T _ oil _ thres _ trans3, the temperature control module opens the radiator branch, the three-way valve is matched with the temperature control module to open the transmission oil cooler branch and the radiator branch, flow in the transmission oil cooler branch is ensured, flow in the radiator branch is ensured, and a radiator fan is opened at the same time.
It should be noted that the first transmission heat engine threshold, the second transmission heat engine threshold, the third transmission heat engine threshold, and the fourth transmission heat engine threshold are calibrated values, and the fourth transmission heat engine threshold is greater than the third transmission heat engine threshold, the third transmission heat engine threshold is greater than the second transmission heat engine threshold, and the second transmission heat engine threshold is greater than the first transmission heat engine threshold.
In summary, the rapid heat engine control method of the transmission of the present invention controls the on-off of the warm air core branch, the transmission oil cooler branch and the radiator branch by controlling the temperature control module and the three-way valve, and can accelerate the heat engine speed of the transmission on the premise of ensuring that the engine heating is not affected in the cold start stage, thereby achieving the friction loss of the engine and the transmission to be reduced simultaneously, reducing the friction waste phenomenon, and reducing the oil consumption of the power assembly system.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a quick heat engine control method of derailleur, is used for cooperating with cooling system, cooling system includes temperature control module and three-way valve, temperature control module and warm braw core branch road, derailleur oil cooler branch road and three-way valve connection, three-way valve connection warm braw core branch road and derailleur oil cooler branch road and radiator branch road, its characterized in that: the method for rapid heat engine control of a transmission comprises the following steps:
during cold start, the water temperature of the system is monitored:
if the water temperature is lower than the warm air response threshold and the water temperature is lower than the transmission response threshold, controlling the temperature control module to enter a quick engine heating mode of the engine;
if the water temperature is not lower than the warm air response threshold and the system has a warm air demand, controlling the temperature control module to open the warm air core branch and controlling the three-way valve to adjust to the positions of opening the warm air core branch, opening the transmission oil cooler branch and closing the radiator branch;
if the water temperature exceeds the response threshold value of the transmission, the three-way valve is controlled to be adjusted to the positions of opening of the oil cooler branch of the transmission and closing of the radiator branch;
and if the water temperature exceeds the heat engine threshold value of the engine, controlling the opening degree of the temperature control module and the rotating speed of the cooling fan according to the water temperature.
2. The rapid heat engine control method of a transmission according to claim 1, characterized in that: further comprising:
reading the rotating speed of the engine;
judging the state of the engine according to the rotating speed of the engine and the water temperature;
when the engine is in a working state, the opening of the temperature control module and the rotating speed of the cooling fan are controlled according to the water temperature.
3. The rapid heat engine control method of a transmission according to claim 2, characterized in that: the opening of the temperature control module and the rotating speed of the cooling fan are calibrated values obtained by looking up a table according to the current rotating speed and load of the engine.
4. A method for rapid heat engine control of a transmission as claimed in claim 2, characterized in that: when the opening degree of the temperature control module is controlled according to the water temperature, the opening degree of the temperature control module is related to the water temperature, and the higher the water temperature is, the larger the opening degree of the temperature control module is.
5. A method for rapid heat engine control of a transmission as claimed in claim 1, characterized in that: the quick heat engine control method of the transmission further comprises the steps of monitoring the oil temperature when the water temperature exceeds the heat engine threshold value of the engine, and judging whether the heat engine of the transmission is finished or not through the oil temperature, wherein the method comprises the following steps:
monitoring the oil temperature of the transmission:
if the water temperature exceeds the engine heat engine threshold value and the oil temperature is lower than the first transmission heat engine threshold value, the lower limit of the opening degree of the temperature control module is restricted, the temperature control module at least opens the warm air core branch and the transmission oil cooler branch, and the three-way valve is adjusted to the positions of opening the warm air core branch, opening the transmission oil cooler branch and closing the radiator branch;
and if the oil temperature exceeds a first transmission heat engine threshold value, indicating that the engine heat engine and the transmission heat engine are both finished, and setting the opening degree of the temperature control module according to the water temperature.
6. The rapid heat engine control method of a transmission according to claim 5, characterized in that: the quick heat engine control method of the transmission also controls the opening degree of the temperature control module and the rotating speed of the cooling fan by monitoring the real-time oil temperature during cold start, and comprises the following steps:
monitoring the oil temperature of the transmission:
if the oil temperature exceeds a second transmission heat engine threshold value, the temperature control module at least opens the warm air core branch, and the three-way valve is adjusted to the positions of opening the warm air core, opening the transmission oil cooler branch and closing the radiator branch;
if the oil temperature exceeds a heat engine threshold value of a third transmission, the temperature control module at least opens a radiator branch, and the three-way valve is adjusted to the positions of closing the warm air core, opening the transmission oil cooler branch and opening the radiator branch;
and if the oil temperature exceeds a heat engine threshold value of the fourth transmission, the cooling fan is turned on.
7. The rapid heat engine control method of a transmission according to claim 6, characterized in that: the first transmission heat engine threshold value, the second transmission heat engine threshold value, the third transmission heat engine threshold value and the fourth transmission heat engine threshold value are calibrated values, wherein the fourth transmission heat engine threshold value is greater than the third transmission heat engine threshold value, the third transmission heat engine threshold value is greater than the second transmission heat engine threshold value, and the second transmission heat engine threshold value is greater than the first transmission heat engine threshold value.
8. The rapid heat engine control method of a transmission according to claim 6, characterized in that: when the opening of the temperature control module and the rotating speed of the cooling fan are controlled during cold starting by monitoring real-time oil temperature, the opening of the temperature control module is related to the oil temperature, and the opening of the temperature control module is larger when the oil temperature is higher; the cooling fan speed is related to the oil temperature, and the higher the oil temperature, the higher the cooling fan speed.
9. A method for rapid heat engine control of a transmission as claimed in claim 1, characterized in that: in the engine rapid heat engine mode, the temperature control module is controlled to execute one of the following strategies:
the temperature control module is fully closed, so that all branches including the warm air core branch, the transmission oil cooler branch and the radiator branch are completely closed, and the flow in the system is zero;
the temperature control module slightly opens the small circulation branch, and other branches are all closed;
the temperature control module intermittently toggles between on and off modes.
10. A method for rapid heat engine control of a transmission as claimed in claim 1, characterized in that: the warm air response threshold value, the transmission response threshold value and the engine heat engine threshold value are calibrated values.
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| CN106321214A (en) * | 2016-09-18 | 2017-01-11 | 安徽江淮汽车股份有限公司 | Engine cooling system |
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