CN114183236A - Automatic control system for cold after-temperature of engine in cold region environment and use method thereof - Google Patents
Automatic control system for cold after-temperature of engine in cold region environment and use method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000010792 warming Methods 0.000 claims description 11
- 238000007710 freezing Methods 0.000 claims description 7
- 230000008014 freezing Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 28
- 238000001816 cooling Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000011217 control strategy Methods 0.000 description 12
- 239000007921 spray Substances 0.000 description 8
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 238000012937 correction Methods 0.000 description 6
- 239000010727 cylinder oil Substances 0.000 description 6
- 238000003745 diagnosis Methods 0.000 description 6
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- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 239000003921 oil Substances 0.000 description 2
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- 230000001105 regulatory effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0493—Controlling the air charge temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
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- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention relates to the technical field of automobile engines, and discloses an automatic control system for after-cold temperature of an engine in a cold region environment. The invention also discloses a use method of the automatic control system for the after-cold temperature of the engine in the cold region environment. The automatic control system for the after-cold temperature of the engine in the cold region environment and the use method thereof reduce the heat of fresh air entering a cylinder in the starting process and taken away by an intercooler, and solve the problem that a throttle valve is blocked at the initial running stage of a vehicle in the extremely cold environment.
Description
Technical Field
The invention relates to the technical field of automobile engines, in particular to an automatic control system for cold after-temperature in an engine in a cold region environment and a use method thereof.
Background
In the cold start stage, the prior art generally reduces the cooling circulation failure of a cooling system through a full joint thermostat to reduce the cooling effect of an intercooler to the maximum extent, and gradually opens the thermostat along with the increase of the water temperature of an engine, thereby realizing the indirect adjustment of the after-intercooling temperature.
However, the technical scheme only roughly adjusts the after-cold temperature, when cold starting is difficult in a cold region environment, although the air before entering the air compressor can be preheated in an air inlet preheating mode, the performance and the service life of the storage battery can be influenced, and because the fresh air enters the air cylinder after passing through the intercooler, a large amount of heat is taken away by the fresh air, the combustion in the engine cylinder is severe, the cold starting is difficult, and the emission economy is poor.
And after intercooling, the temperature is too low, freezing and clamping stagnation of the throttle valve are easy to occur, the driving capability of a throttle valve motor is enhanced to forcedly break the freezing, and the circuit fault of the throttle valve motor is easy to cause.
Chinese patent (publication No.: 2013, 17.04.2013, publication No. CN202886985U) discloses an after-intercooling temperature control system and an engine test system, wherein the after-intercooling temperature control system comprises: the gas inlet main pipe is provided with a sensor for monitoring the gas inlet flow of the gas to be cooled, and the gas inlet main pipe behind the inlet sensor is provided with two branch pipes, namely an intercooling temperature control branch pipe and a flow dividing control branch pipe; the flow control branch pipe is provided with a flow control valve for controlling the flow of gas entering the intercooler; the intercooler cools the gas to be cooled, and one end of the intercooler is connected with the intercooler temperature control branch pipe; the air outlet main pipe is connected with the other end of the intercooler and the shunt control branch pipe, and an air outlet temperature sensor for monitoring the actual air outlet temperature is further arranged on a pipeline of the air outlet main pipe after the air outlet main pipe is connected to the shunt control branch pipe; and the controller for adjusting the air outlet temperature is connected with the inlet sensor, the flow regulating valve and the air outlet temperature sensor. Therefore, the utility model has good responsiveness and small overshoot. But this utility model mainly has solved the problem that well cold temperature control response is slow, the overshoot is big, does not solve the jamming problem of choke valve, does not solve the cold startability problem of engine yet.
Chinese patent (published: 30/03/2021, publication number: CN112576398A) discloses an engine control method, an engine control device and a vehicle. The engine control method includes: determining the state of the engine according to the state of the air-bleed brake valve and the temperature after inter-cooling; if the engine is in an air-leakage braking state or a first non-air-leakage braking state, determining a temperature oil injection quantity coefficient after intercooling according to the temperature after intercooling and a first correction relation curve; the first correction relation curve is used for storing the correlation relation between the correction values of the injection quantity coefficients of the post-intercooling temperature and the post-intercooling temperature; meanwhile, determining a smoke limit oil injection quantity coefficient according to the intercooled temperature, the engine speed, the air inflow per cycle and a second correction relation curve; and the second correction relation curve is used for storing the correlation between the intercooled temperature and the excess air coefficient correction value. The technical scheme provided by the embodiment of the invention can prevent the engine from stalling because the torque limit cannot provide enough power. However, this application does not solve the problem of the throttle sticking nor the problem of the cold start performance of the engine.
Chinese patent (published: 2018, 18 th of 05 and 18 th of published: CN207380574U) discloses a double-closed-loop independently-controlled spray intercooling constant temperature device, wherein a water storage tank is connected with a water pump, the water pump is respectively connected with a heat exchanger and a three-way proportional confluence valve pipeline, the heat exchanger is respectively connected with a chilled water inlet pipe and a chilled water outlet pipe, the three-way proportional confluence valve is connected with a corresponding spray head pipeline through a solenoid valve, the three-way proportional confluence valve is connected with the water storage tank pipeline, a spray water temperature sensor is arranged on a pipeline between the three-way proportional confluence valve and the solenoid valve, the spray water temperature sensor and the three-way proportional confluence valve are electrically connected with a spray water temperature controller, and the spray water temperature sensor, the three-way proportional confluence valve and the spray water temperature controller form a spray water temperature closed-loop control system; an intercooling rear temperature sensor is arranged on a pressurized air outlet pipeline connected with an intercooler of the whole vehicle, the intercooling rear temperature sensor and the electromagnetic valve are electrically connected with an intercooling rear temperature controller, and the intercooling rear temperature sensor, the electromagnetic valve and the intercooling rear temperature controller form an intercooling rear temperature closed-loop control system. However, this application does not solve the problem of the throttle sticking nor the problem of the cold start performance of the engine.
Disclosure of Invention
The invention aims to provide an automatic control system for the after-cold temperature of an engine in a cold region environment and a using method thereof, which aim to overcome the defects of the prior art, reduce the heat of fresh air entering a cylinder in the starting process and taken away by an intercooler, improve the cold starting performance of the engine, and solve the problem of throttle valve jamming in the initial running stage of a vehicle in an extremely cold environment by improving the after-cold temperature of the engine in the initial running stage.
In order to achieve the purpose, the automatic control system for the after-cold temperature of the engine in the cold region environment comprises an air cylinder and an air suction device, wherein an air outlet of the air suction device is connected with an air inlet of an intercooler, an air outlet of the intercooler is connected with an air inlet of a throttle valve, the other end of the throttle valve is connected with the air inlet of the air cylinder, an air inlet bypass valve is further connected with an air outlet of the air suction device, the other end of the air inlet bypass valve is connected with the air inlet of the throttle valve, an after-cold temperature sensor is arranged at the air outlet of the intercooler, and the after-cold temperature sensor, the air suction device, the air inlet bypass valve and the throttle valve are all connected with a control module.
Preferably, a supercharger is arranged on the air suction device.
Preferably, the air outlet of the air cylinder is connected with the air inlet of the air suction device.
When the engine is in a COLD START state, and the after-COLD temperature acquired by the after-COLD temperature sensor is lower than a first preset temperature T1, the engine enters a T _ COLD START mode, and the control module controls the throttle valve and the intake bypass valve to be fully opened.
Preferably, when the after-middle-cooling temperature acquired by the after-middle-cooling temperature sensor is higher than a first preset temperature T1 and lower than a second preset temperature T2, the T _ WARMING mode is entered, and the control module controls the opening degrees of the throttle valve and the intake bypass valve, maintains the temperature of the throttle valve and avoids freezing and stagnation of the throttle valve.
Preferably, when the after-cold temperature obtained by the after-cold temperature sensor is higher than a second preset temperature T2, the control module enters a T _ NORMAL mode and controls the air intake bypass valve to be fully closed.
Preferably, the control module calculates a required opening degree of the intake bypass valve according to the post-intercooling temperature acquired by the post-intercooling temperature sensor, wherein the lower the post-intercooling temperature is, the larger the opening degree of the intake bypass valve is, and the higher the post-intercooling temperature is, the smaller the opening degree of the intake bypass valve is.
Preferably, the control module performs average processing of 10-20 Hz on the intercooling after-temperature obtained by the intercooling after-temperature sensor so as to reduce the control frequency of the air inlet bypass valve and ensure the stability of the air inlet system.
Preferably, the first preset temperature T1 is 20-40 ℃.
Preferably, the second preset temperature T2 is 100-150 ℃.
Compared with the prior art, the invention has the following advantages:
1. the heat quantity of fresh air entering a cylinder in the starting process and taken away by an intercooler is reduced, and the cold starting performance of the engine is improved;
2. the problem of throttle valve clamping stagnation at the initial running stage of the vehicle in an extremely cold environment is solved by improving the after-cold temperature at the initial running stage of the engine.
Drawings
Fig. 1 is a schematic structural diagram of an automatic control system for after-cold temperature in an engine in a cold region environment.
The components in the figures are numbered as follows:
the air cylinder cooling system comprises an air cylinder 1, an air suction device 2, an intercooler 3, a throttle valve 4, an air inlet bypass valve 5, an intercooling rear temperature sensor 6 and a supercharger 7.
Detailed Description
The present invention is further described in detail with reference to the drawings and the detailed description, and the technical solutions in the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1, an automatic control system for after-cold temperature in an engine in a cold region environment comprises an air cylinder 1 and an air suction device 2, an air outlet of the air suction device 2 is connected with an air inlet of an intercooler 3, an air outlet of the intercooler 3 is connected with an air inlet of a throttle valve 4, the other end of the throttle valve 4 is connected with the air inlet of the air cylinder 1, an air inlet bypass valve 5 is further connected with an air outlet of the air suction device 2, the other end of the air inlet bypass valve 5 is connected with an air inlet of the throttle valve 4, an after-cold temperature sensor 6 is arranged at the air outlet of the intercooler 3, and the after-cold temperature sensor 6, the air suction device 2, the air inlet bypass valve 5 and the throttle valve 4 are all connected with a control module.
Example 2
As shown in fig. 1, an automatic control system for after-cold temperature in an engine in a cold region environment comprises an air cylinder 1 and an air suction device 2, wherein a supercharger 7 is arranged on the air suction device 2, an air outlet of the air suction device 2 is connected with an air inlet of an intercooler 3, an air outlet of the intercooler 3 is connected with an air inlet of a throttle valve 4, the other end of the throttle valve 4 is connected with the air inlet of the air cylinder 1, an air outlet of the air suction device 2 is further connected with an air inlet bypass valve 5, the other end of the air inlet bypass valve 5 is connected with the air inlet of the throttle valve 4, an air outlet of the intercooler 3 is provided with an after-cold temperature sensor 6, and the after-cold temperature sensor 6, the air suction device 2, the air inlet bypass valve 5 and the throttle valve 4 are all connected with a control module.
Example 3
As shown in fig. 1, an automatic control system for after-cold temperature of an engine in a cold region environment comprises a cylinder 1 and an air suction device 2, an air outlet of the cylinder 1 is connected with an air inlet of the air suction device 2, a supercharger 7 is arranged on the air suction device 2, an air outlet of the air suction device 2 is connected with an air inlet of an intercooler 3, an air outlet of the intercooler 3 is connected with an air inlet of a throttle valve 4, the other end of the throttle valve 4 is connected with an air inlet of the cylinder 1, an air inlet bypass valve 5 is further connected with an air outlet of the air suction device 2, the other end of the air inlet bypass valve 5 is connected with an air inlet of the throttle valve 4, an after-cold temperature sensor 6 is arranged at the air outlet of the intercooler 3, and the after-cold temperature sensor 6, the air suction device 2, the air inlet bypass valve 5 and the throttle valve 4 are all connected with a control module.
The usage method of the automatic control system for the after-COLD temperature in the engine in the COLD region environment in the foregoing embodiment is that after the engine is COLD started, when the after-COLD temperature acquired by the after-COLD temperature sensor 6 is lower than the first preset temperature T1, the after-COLD temperature control mode is defined as the T _ COLD START mode, when the after-COLD temperature acquired by the after-COLD temperature sensor 6 is higher than the first preset temperature T1 and lower than the second preset temperature T2, the mode is entered as the T _ NORMAL mode, when the after-COLD temperature acquired by the after-COLD temperature sensor 6 is higher than the second preset temperature T2, the mode is entered as the T _ NORMAL mode, and in one driving cycle, the state of the intake bypass control system is defined as the above three states. The following examples are specific:
example 4
When the engine is in a COLD starting state, the after-COLD temperature acquired by the after-COLD temperature sensor 6 is lower than a first preset temperature by 20 ℃, the engine enters a T _ COLD START mode, the T _ COLD START mode is in a parking state generally in the COLD starting process, the COLD starting state generally in the COLD starting process, the after-COLD temperature control strategy receives and judges the COLD starting state of the engine, the control module controls the throttle valve and the intake bypass valve 5 to be fully opened, part of fresh air entering through the intake bypass valve 5 is not cooled by the intercooler 3 but directly enters the cylinder 1 to reduce heat loss as much as possible, the fresh air with higher temperature can improve the integral temperature in the cylinder, the cylinder oil is evaporated to form easily ignited mixed gas to improve the COLD starting performance, the COLD starting time is shortened, the quick starting of the engine is realized, the COLD starting effect is improved, and meanwhile, the temperature of the fresh air passing through the intake bypass valve 5 is higher, the throttle valve 4 can be fully preheated;
when the post-intercooling temperature acquired by the post-intercooling temperature sensor 6 is 20 ℃ higher than the first preset temperature and 100 ℃ lower than the second preset temperature, entering a T _ WARMING mode, in the initial running process of the vehicle, the air cooling effect of the intercooler 3 is enhanced due to the fact that the vehicle speed is increased, compared with the T _ COLD START mode in the COLD starting process, the temperature of fresh air is obviously reduced after passing through the intercooler 3, the throttle valve 4 is impacted by the COLD and hot temperature, the phenomenon of condensation and icing occurs, and in the extremely COLD environment, the low-temperature state can be maintained at the throttle valve 4 in a short time, the state can cause the valve plate and the valve plate driving shaft of the throttle valve 4 to be iced and frozen, but in the stage, the emission control strategy needs to increase the exhaust temperature to ensure the emission, so a control command of closing and opening of the throttle valve 4 can be given, the fault diagnosis system can diagnose the throttle valve 4 can not respond to the control command, and reporting the fault of the clamping stagnation of the throttle valve 4. For this reason, in the T _ warning mode, the control module controls the opening of the throttle valve 4 and the intake bypass valve 5 to maintain the temperature of the throttle valve 4 and prevent the throttle valve 4 from freezing and sticking.
When the after-intercooling temperature acquired by the after-intercooling temperature sensor 6 is higher than the second preset temperature by 100 ℃, the engine enters a T _ NORMAL mode, the control module controls the air inlet bypass valve 5 to be fully closed, the engine continues to operate in the T _ NORMAL mode, the after-intercooling temperature is higher than 100 ℃, the fully closed state of the air inlet bypass valve 5 can be maintained, the compressed fresh air is cooled by the intercooler 3 and then enters the cylinder 1, and the after-intercooling temperature which is high enough can ensure that the engine can operate well and the throttle valve 4 can work normally.
Example 5
When the engine is in a COLD starting state, the after-COLD temperature acquired by the after-COLD temperature sensor 6 is lower than a first preset temperature of 40 ℃, the engine enters a T _ COLD START mode, the T _ COLD START mode is in a parking state generally in the COLD starting process, the COLD starting state generally in the COLD starting process, the after-COLD temperature control strategy receives and judges the COLD starting state of the engine, the control module controls the throttle valve and the intake bypass valve 5 to be fully opened, part of fresh air entering through the intake bypass valve 5 is not cooled by the intercooler 3 but directly enters the cylinder 1 to reduce heat loss as much as possible, the fresh air with higher temperature can improve the integral temperature in the cylinder, the cylinder oil is evaporated to form easily ignited mixed gas to improve the COLD starting performance, the COLD starting time is shortened, the quick starting of the engine is realized, the COLD starting effect is improved, and meanwhile, the temperature of the fresh air passing through the intake bypass valve 5 is higher, the throttle valve 4 can be fully preheated;
when the post-intercooling temperature acquired by the post-intercooling temperature sensor 6 is higher than 40 ℃ of the first preset temperature and lower than 150 ℃ of the second preset temperature, entering a T _ WARMING mode, in the initial running process of the vehicle, the air cooling effect of the intercooler 3 is enhanced due to the fact that the vehicle speed is increased, compared with the T _ COLD START mode in the COLD starting process, the temperature of fresh air is obviously reduced after passing through the intercooler 3, the throttle valve 4 is impacted by the COLD and hot temperature, the phenomenon of condensation and icing occurs, and in the extremely COLD environment, the low-temperature state can be maintained at the throttle valve 4 in a short time, the state can cause the valve plate and the valve plate driving shaft of the throttle valve 4 to be frozen, but in the stage, the emission control strategy needs to increase the exhaust temperature to ensure the emission, so that a control command of closing and opening of the throttle valve 4 can be given, the fault diagnosis system can diagnose, and the throttle valve 4 cannot respond to the control command, and reporting the fault of the clamping stagnation of the throttle valve 4. For this reason, in the T _ warning mode, the control module controls the opening of the throttle valve 4 and the intake bypass valve 5 to maintain the temperature of the throttle valve 4 and prevent the throttle valve 4 from freezing and sticking.
When the after-intercooling temperature acquired by the after-intercooling temperature sensor 6 is higher than the second preset temperature by 100 ℃, the engine enters a T _ NORMAL mode, the control module controls the air inlet bypass valve 5 to be fully closed, the engine continues to operate in the T _ NORMAL mode, the after-intercooling temperature is higher than 150 ℃, the fully closed state of the air inlet bypass valve 5 can be maintained, the compressed fresh air is cooled by the intercooler 3 and then enters the cylinder 1, and the after-intercooling temperature which is high enough can ensure that the engine can operate well and the throttle valve 4 can work normally.
Example 6
When the engine is in a COLD starting state, the after-COLD temperature acquired by the after-COLD temperature sensor 6 is lower than a first preset temperature by 30 ℃, the engine enters a T _ COLD START mode, the T _ COLD START mode is in a parking state generally in the COLD starting process, the COLD starting state generally in the COLD starting process, the after-COLD temperature control strategy receives and judges the COLD starting state of the engine, the control module controls the throttle valve and the intake bypass valve 5 to be fully opened, part of fresh air entering through the intake bypass valve 5 is not cooled by the intercooler 3 but directly enters the cylinder 1 to reduce heat loss as much as possible, the fresh air with higher temperature can improve the integral temperature in the cylinder, the cylinder oil is evaporated to form easily ignited mixed gas to improve the COLD starting performance, the COLD starting time is shortened, the quick starting of the engine is realized, the COLD starting effect is improved, and meanwhile, the temperature of the fresh air passing through the intake bypass valve 5 is higher, the throttle valve 4 can be fully preheated;
when the post-intercooling temperature acquired by the post-intercooling temperature sensor 6 is higher than a first preset temperature by 30 ℃ and lower than a second preset temperature by 125 ℃, entering a T _ WARMING mode, in the initial running process of the vehicle, the air cooling effect of the intercooler 3 is enhanced due to the fact that the vehicle speed is increased, compared with a T _ COLD START mode in the COLD starting process, the temperature of fresh air is obviously reduced after passing through the intercooler 3, the throttle valve 4 is impacted by the COLD and hot temperature, the phenomenon of condensation and icing occurs, and in an extremely COLD environment, the low-temperature state can be maintained at the throttle valve 4 in a short time, the state can cause the valve plate and the valve plate driving shaft of the throttle valve 4 to be iced and frozen, but in the stage, the emission control strategy needs to increase the exhaust temperature to ensure the emission, so a control command of the opening degree of the throttle valve 4 is given, the fault diagnosis system diagnoses that the throttle valve 4 cannot respond to the control command, and reporting the fault of the clamping stagnation of the throttle valve 4. For this reason, in the T _ warning mode, the control module controls the opening of the throttle valve 4 and the intake bypass valve 5 to maintain the temperature of the throttle valve 4 and prevent the throttle valve 4 from freezing and sticking.
When the after-intercooling temperature acquired by the after-intercooling temperature sensor 6 is higher than the second preset temperature by 125 ℃, the engine enters a T _ NORMAL mode, the control module controls the air inlet bypass valve 5 to be fully closed, the engine continues to operate in the T _ NORMAL mode, the after-intercooling temperature is higher than 100 ℃, the fully closed state of the air inlet bypass valve 5 can be maintained, the compressed fresh air is cooled by the intercooler 3 and then enters the cylinder 1, and the after-intercooling temperature which is high enough can ensure that the engine can operate well and the throttle valve 4 can work normally.
Example 6
When the engine is in a COLD starting state, the after-COLD temperature acquired by the after-COLD temperature sensor 6 is lower than a first preset temperature by 30 ℃, the engine enters a T _ COLD START mode, the T _ COLD START mode is in a parking state generally in the COLD starting process, the COLD starting state generally in the COLD starting process, the after-COLD temperature control strategy receives and judges the COLD starting state of the engine, the control module controls the throttle valve and the intake bypass valve 5 to be fully opened, part of fresh air entering through the intake bypass valve 5 is not cooled by the intercooler 3 but directly enters the cylinder 1 to reduce heat loss as much as possible, the fresh air with higher temperature can improve the integral temperature in the cylinder, the cylinder oil is evaporated to form easily ignited mixed gas to improve the COLD starting performance, the COLD starting time is shortened, the quick starting of the engine is realized, the COLD starting effect is improved, and meanwhile, the temperature of the fresh air passing through the intake bypass valve 5 is higher, the throttle valve 4 can be fully preheated;
when the post-intercooling temperature acquired by the post-intercooling temperature sensor 6 is higher than a first preset temperature by 30 ℃ and lower than a second preset temperature by 125 ℃, entering a T _ WARMING mode, in the initial running process of the vehicle, the air cooling effect of the intercooler 3 is enhanced due to the fact that the vehicle speed is increased, compared with a T _ COLD START mode in the COLD starting process, the temperature of fresh air is obviously reduced after passing through the intercooler 3, the throttle valve 4 is impacted by the COLD and hot temperature, the phenomenon of condensation and icing occurs, and in an extremely COLD environment, the low-temperature state can be maintained at the throttle valve 4 in a short time, the state can cause the valve plate and the valve plate driving shaft of the throttle valve 4 to be iced and frozen, but in the stage, the emission control strategy needs to increase the exhaust temperature to ensure the emission, so a control command of the opening degree of the throttle valve 4 is given, the fault diagnosis system diagnoses that the throttle valve 4 cannot respond to the control command, and reporting the fault of the clamping stagnation of the throttle valve 4. Therefore, in the T _ WARMING mode, the control module controls the opening degrees of the throttle valve 4 and the intake bypass valve 5, the control module calculates the required opening degree of the intake bypass valve 5 according to the after-intercooling temperature acquired by the after-intercooling temperature sensor 6, the lower the after-intercooling temperature is, the larger the opening degree of the intake bypass valve 5 is, and the higher the after-intercooling temperature is, the smaller the opening degree of the intake bypass valve 5 is, so that the temperature of the throttle valve 4 is maintained, and the throttle valve 4 is prevented from being frozen and stuck.
When the after-intercooling temperature acquired by the after-intercooling temperature sensor 6 is higher than the second preset temperature by 125 ℃, the engine enters a T _ NORMAL mode, the control module controls the air inlet bypass valve 5 to be fully closed, the engine continues to operate in the T _ NORMAL mode, the after-intercooling temperature is higher than 100 ℃, the fully closed state of the air inlet bypass valve 5 can be maintained, the compressed fresh air is cooled by the intercooler 3 and then enters the cylinder 1, and the after-intercooling temperature which is high enough can ensure that the engine can operate well and the throttle valve 4 can work normally.
Example 7
When the engine is in a COLD starting state, the after-COLD temperature acquired by the after-COLD temperature sensor 6 is lower than a first preset temperature by 30 ℃, the engine enters a T _ COLD START mode, the T _ COLD START mode is in a parking state generally in the COLD starting process, the COLD starting state generally in the COLD starting process, the after-COLD temperature control strategy receives and judges the COLD starting state of the engine, the control module controls the throttle valve and the intake bypass valve 5 to be fully opened, part of fresh air entering through the intake bypass valve 5 is not cooled by the intercooler 3 but directly enters the cylinder 1 to reduce heat loss as much as possible, the fresh air with higher temperature can improve the integral temperature in the cylinder, the cylinder oil is evaporated to form easily ignited mixed gas to improve the COLD starting performance, the COLD starting time is shortened, the quick starting of the engine is realized, the COLD starting effect is improved, and meanwhile, the temperature of the fresh air passing through the intake bypass valve 5 is higher, the throttle valve 4 can be fully preheated;
when the post-intercooling temperature acquired by the post-intercooling temperature sensor 6 is higher than a first preset temperature by 30 ℃ and lower than a second preset temperature by 125 ℃, entering a T _ WARMING mode, in the initial running process of the vehicle, the air cooling effect of the intercooler 3 is enhanced due to the fact that the vehicle speed is increased, compared with a T _ COLD START mode in the COLD starting process, the temperature of fresh air is obviously reduced after passing through the intercooler 3, the throttle valve 4 is impacted by the COLD and hot temperature, the phenomenon of condensation and icing occurs, and in an extremely COLD environment, the low-temperature state can be maintained at the throttle valve 4 in a short time, the state can cause the valve plate and the valve plate driving shaft of the throttle valve 4 to be iced and frozen, but in the stage, the emission control strategy needs to increase the exhaust temperature to ensure the emission, so a control command of the opening degree of the throttle valve 4 is given, the fault diagnosis system diagnoses that the throttle valve 4 cannot respond to the control command, and reporting the fault of the clamping stagnation of the throttle valve 4. Therefore, in the T _ WARMING mode, the control module controls the opening degrees of the throttle valve 4 and the air inlet bypass valve 5, the control module calculates the required opening degree of the air inlet bypass valve 5 according to the after-intercooling temperature acquired by the after-intercooling temperature sensor 6, the lower the after-intercooling temperature is, the larger the opening degree of the air inlet bypass valve 5 is, the higher the after-intercooling temperature is, the smaller the opening degree of the air inlet bypass valve 5 is, the temperature of the throttle valve 4 is maintained, icing and clamping stagnation of the throttle valve 4 are avoided, and in addition, the control module performs 10Hz mean value processing on the after-intercooling temperature acquired by the after-intercooling temperature sensor 6 to reduce the control frequency of the air inlet bypass valve 5 and ensure the stability of an air inlet system.
When the after-intercooling temperature acquired by the after-intercooling temperature sensor 6 is higher than the second preset temperature by 125 ℃, the engine enters a T _ NORMAL mode, the control module controls the air inlet bypass valve 5 to be fully closed, the engine continues to operate in the T _ NORMAL mode, the after-intercooling temperature is higher than 100 ℃, the fully closed state of the air inlet bypass valve 5 can be maintained, the compressed fresh air is cooled by the intercooler 3 and then enters the cylinder 1, and the after-intercooling temperature which is high enough can ensure that the engine can operate well and the throttle valve 4 can work normally.
Example 8
When the engine is in a COLD starting state, the after-COLD temperature acquired by the after-COLD temperature sensor 6 is lower than a first preset temperature by 30 ℃, the engine enters a T _ COLD START mode, the T _ COLD START mode is in a parking state generally in the COLD starting process, the COLD starting state generally in the COLD starting process, the after-COLD temperature control strategy receives and judges the COLD starting state of the engine, the control module controls the throttle valve and the intake bypass valve 5 to be fully opened, part of fresh air entering through the intake bypass valve 5 is not cooled by the intercooler 3 but directly enters the cylinder 1 to reduce heat loss as much as possible, the fresh air with higher temperature can improve the integral temperature in the cylinder, the cylinder oil is evaporated to form easily ignited mixed gas to improve the COLD starting performance, the COLD starting time is shortened, the quick starting of the engine is realized, the COLD starting effect is improved, and meanwhile, the temperature of the fresh air passing through the intake bypass valve 5 is higher, the throttle valve 4 can be fully preheated;
when the post-intercooling temperature acquired by the post-intercooling temperature sensor 6 is higher than a first preset temperature by 30 ℃ and lower than a second preset temperature by 125 ℃, entering a T _ WARMING mode, in the initial running process of the vehicle, the air cooling effect of the intercooler 3 is enhanced due to the fact that the vehicle speed is increased, compared with a T _ COLD START mode in the COLD starting process, the temperature of fresh air is obviously reduced after passing through the intercooler 3, the throttle valve 4 is impacted by the COLD and hot temperature, the phenomenon of condensation and icing occurs, and in an extremely COLD environment, the low-temperature state can be maintained at the throttle valve 4 in a short time, the state can cause the valve plate and the valve plate driving shaft of the throttle valve 4 to be iced and frozen, but in the stage, the emission control strategy needs to increase the exhaust temperature to ensure the emission, so a control command of the opening degree of the throttle valve 4 is given, the fault diagnosis system diagnoses that the throttle valve 4 cannot respond to the control command, and reporting the fault of the clamping stagnation of the throttle valve 4. Therefore, in the T _ WARMING mode, the control module controls the opening degrees of the throttle valve 4 and the air inlet bypass valve 5, the control module calculates the required opening degree of the air inlet bypass valve 5 according to the after-intercooling temperature acquired by the after-intercooling temperature sensor 6, the lower the after-intercooling temperature is, the larger the opening degree of the air inlet bypass valve 5 is, the higher the after-intercooling temperature is, the smaller the opening degree of the air inlet bypass valve 5 is, the temperature of the throttle valve 4 is maintained, icing and clamping stagnation of the throttle valve 4 are avoided, and in addition, the control module performs 20Hz mean value processing on the after-intercooling temperature acquired by the after-intercooling temperature sensor 6 to reduce the control frequency of the air inlet bypass valve 5 and ensure the stability of an air inlet system.
When the after-intercooling temperature acquired by the after-intercooling temperature sensor 6 is higher than the second preset temperature by 125 ℃, the engine enters a T _ NORMAL mode, the control module controls the air inlet bypass valve 5 to be fully closed, the engine continues to operate in the T _ NORMAL mode, the after-intercooling temperature is higher than 100 ℃, the fully closed state of the air inlet bypass valve 5 can be maintained, the compressed fresh air is cooled by the intercooler 3 and then enters the cylinder 1, and the after-intercooling temperature which is high enough can ensure that the engine can operate well and the throttle valve 4 can work normally.
The use method of the automatic control system for the after-cold temperature of the engine in the cold region environment reduces the heat of fresh air entering a cylinder in the starting process and taken away by the intercooler, improves the cold starting performance of the engine, and solves the problem of throttle valve clamping in the initial running stage of a vehicle in the extremely cold environment by improving the after-cold temperature in the initial running stage of the engine.
Finally, it should be noted that the above is a detailed description of the invention, and the embodiments of the invention are not limited to the description, and those skilled in the art should be considered as falling within the protection scope of the present invention without departing from the spirit of the present invention. The above embodiments are merely representative examples of the present invention. It is obvious that the invention is not limited to the above-described embodiments, but that many variations are possible. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical spirit of the present invention should be considered to be within the scope of the present invention.
Meanwhile, it should be noted that the above description of the technical solutions is exemplary, the present specification may be embodied in different forms, and should not be construed as being limited to the technical solutions set forth herein. Rather, these descriptions are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the present invention is limited only by the scope of the claims. The features of the various embodiments of the present invention may be partially or fully combined or spliced with each other and performed in a variety of different configurations as would be well understood by those skilled in the art. Embodiments of the invention may be performed independently of each other or may be performed together in an interdependent relationship.
For those skilled in the art to which the invention relates, several simple deductions or substitutions may be made without departing from the spirit of the invention, and the above-mentioned structures should be considered as belonging to the protection scope of the invention.
Claims (10)
1. The utility model provides an automatic control system of cold back temperature in engine under cold district environment, includes cylinder (1) and getter device (2), its characterized in that: the air outlet of getter device (2) even has the air inlet of intercooler (3), the air outlet of intercooler (3) even has the air inlet of choke valve (4), the other end of choke valve (4) with the air inlet of cylinder (1) is connected, the air outlet of getter device (2) still even has air inlet bypass valve (5), the other end of air inlet bypass valve (5) is connected the air inlet of choke valve (4), the air outlet of intercooler (3) is equipped with after-cold temperature sensor (6), getter device (2), air inlet bypass valve (5) and choke valve (4) all are connected with control module.
2. The cold region after-temperature automatic control system of the engine in the cold region environment as claimed in claim 1, characterized in that: and a supercharger (7) is arranged on the air suction device (2).
3. The cold region after-temperature automatic control system of the engine in the cold region environment as claimed in claim 1, characterized in that: the air outlet of the air cylinder (1) is connected with the air inlet of the air suction device (2).
4. A use method of an automatic cold aftertemperature control system of an engine in a cold region environment as claimed in any one of claims 1 to 3, characterized in that: when the engine is in a COLD starting state, and the after-COLD temperature acquired by the after-COLD temperature sensor (6) is lower than a first preset temperature T1, the engine enters a T _ COLD START mode, and the control module controls the throttle valve and the intake bypass valve (5) to be fully opened.
5. The use method of the cold rear temperature automatic control system of the engine in the cold region environment as claimed in claim 4, is characterized in that: when the after-cold temperature acquired by the after-cold temperature sensor (6) is higher than a first preset temperature T1 and lower than a second preset temperature T2, the engine enters a T _ WARMING mode, the control module controls the opening degree of the throttle valve (4) and the opening degree of the intake bypass valve (5), the temperature of the throttle valve (4) is maintained, and the throttle valve (4) is prevented from freezing and being stuck.
6. The use method of the cold rear temperature automatic control system of the engine in the cold region environment as claimed in claim 5, is characterized in that: and when the after-cold temperature acquired by the after-cold temperature sensor (6) is higher than a second preset temperature T2, entering a T _ NORMAL mode, and controlling the intake bypass valve (5) to be fully closed by the control module.
7. The use method of the cold rear temperature automatic control system of the engine in the cold region environment as claimed in claim 5, is characterized in that: the control module calculates the required opening degree of the air inlet bypass valve (5) according to the after-intercooling temperature acquired by the after-intercooling temperature sensor (6), wherein the lower the after-intercooling temperature is, the larger the opening degree of the air inlet bypass valve (5) is, and the higher the after-intercooling temperature is, the smaller the opening degree of the air inlet bypass valve (5) is.
8. The use method of the cold rear temperature automatic control system of the engine in the cold region environment as claimed in claim 5, is characterized in that: and the control module performs average value processing of 10-20 Hz on the intercooled post-temperature acquired by the intercooled post-temperature sensor (6).
9. The use method of the cold rear temperature automatic control system of the engine in the cold region environment as claimed in claim 4, is characterized in that: the first preset temperature T1 is 20-40 ℃.
10. The use method of the cold rear temperature automatic control system of the engine in the cold region environment as claimed in claim 5, is characterized in that: the second preset temperature T2 is 100-150 ℃.
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