CN116950740A - Engine thermal management control method - Google Patents
Engine thermal management control method Download PDFInfo
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- CN116950740A CN116950740A CN202310789071.3A CN202310789071A CN116950740A CN 116950740 A CN116950740 A CN 116950740A CN 202310789071 A CN202310789071 A CN 202310789071A CN 116950740 A CN116950740 A CN 116950740A
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- oil
- cooling liquid
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- 238000000034 method Methods 0.000 title claims abstract description 55
- 239000010705 motor oil Substances 0.000 claims abstract description 423
- 239000003921 oil Substances 0.000 claims abstract description 93
- 239000000110 cooling liquid Substances 0.000 claims abstract description 79
- 238000010438 heat treatment Methods 0.000 claims abstract description 57
- 239000002826 coolant Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000001050 lubricating effect Effects 0.000 abstract description 26
- 239000007789 gas Substances 0.000 description 91
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/001—Heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/005—Controlling temperature of lubricant
- F01M5/007—Thermostatic control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
- F01M5/021—Conditioning lubricant for aiding engine starting, e.g. heating by heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The invention relates to a control method for engine thermal management, which comprises the following steps: s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat; and S2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature. In the thermal management control system, when the temperature of engine oil in a lubricating system is too low, the viscosity of the engine oil is increased, and the friction resistance between friction pairs in an engine is increased; when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil temperature is raised by controlling the engine oil thermostat and using the cooling liquid to heat the engine oil, so that the viscosity of the engine oil is reduced, the thermal efficiency and the mechanical efficiency of the engine are improved, and the oil consumption is reduced; in addition, the tail gas can be utilized to heat engine oil, so that the system pressure of an engine lubricating system can be quickly built, and the economy of the engine is improved.
Description
Technical Field
The invention relates to the technical field of automobile thermal management, in particular to an engine thermal management control method.
Background
At present, most of engine oil thermostats in engine heat management adopt paraffin as a temperature sensing medium, when the engine oil temperature of an engine main oil duct is higher than a certain threshold value, the paraffin engine oil thermostats open valves, and the engine oil thermostat is mainly used for adjusting the flow of engine oil flowing through an engine oil cooler, so that the engine oil temperature is reduced by using cooling liquid, and the engine is ensured to operate at a proper temperature.
However, in the cold start process and the running process of the engine, the condition that the temperature of engine oil in partial working conditions is lower than that of cooling liquid can occur, and at the moment, the engine oil thermostat is always in a closed state, so that the engine oil temperature is low, the viscosity is high, the friction work is high, and the normal movement of the engine is not facilitated.
Disclosure of Invention
In order to solve the problems, the invention provides an engine thermal management control method for realizing quick establishment of the pressure of an engine lubrication system.
The technical scheme adopted by the invention is as follows: a heat management control method of an engine is characterized in that: the method comprises the following steps:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat;
and S2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature.
Preferably, the specific steps of S1 are as follows: the sensor obtains the real-time temperature of engine oil in the main oil duct and the real-time temperature of engine cooling liquid; and comparing the real-time temperature of the engine oil in the main oil duct with the real-time temperature of the engine coolant, and adjusting the opening of the engine oil thermostat to be in a full-open state if the engine oil temperature is smaller than the coolant temperature.
Preferably, a satisfies any of the conditions above: a. the engine is in a pre-starting state, the engine oil sensor is invalid, the temperature of the engine oil is overhigh, and the water temperature is higher than the oil temperature by a certain threshold value in the engine starting state; the engine oil thermostat duty cycle=0, the valve is fully closed, and the engine oil passes through the engine oil cooler.
Preferably, B satisfies any of the conditions above: a. the engine is in a starting state, and the temperature of the engine oil is too low; the oil thermostat duty cycle=100, the valve is fully open and the oil does not pass through the oil cooler.
Preferably, none of A, B is satisfied, and the engine oil thermostat duty cycle controls the valve opening in accordance with PID.
Preferably, the specific step S2 is as follows: the sensor obtains the real-time temperature of the engine oil in the oil pan, compares the difference value between the target temperature of the engine oil in the oil pan and the real-time temperature with an allowable difference value range, and adjusts the opening of the exhaust gas heating electromagnetic valve until the difference value between the real-time temperature and the target temperature falls within the allowable difference value range if the difference value between the real-time temperature and the target temperature is not within the allowable range.
Preferably, C satisfies any of the conditions above: a. the engine is in a pre-starting state, b, the temperature discharge sensor is invalid, c, the temperature discharge is too high; duty ratio=0, the exhaust gas heating solenoid valve is fully closed, and the exhaust gas does not heat the engine oil.
Preferably, D satisfies any of the conditions above: a. the engine is in a starting state, and the temperature of the oil is too low; duty ratio=100, and exhaust gas heating solenoid valve is fully opened, and exhaust gas heats the engine oil.
Preferably, none of C, D is satisfied and the exhaust gas heating solenoid valve duty cycle is controlled in accordance with PID control valve opening.
Preferably, in the warm state, the opening degree of the engine oil thermostat is controlled according to the temperature of the engine oil, and when the temperature of the engine oil is a first threshold value, only the exhaust gas heating electromagnetic valve is opened, because the temperature of the cooling liquid and the temperature of the engine oil are not greatly different at present, and the cooling liquid cannot heat the engine oil; when the temperature of the engine oil rises, the exhaust gas heating electromagnetic valve and the engine oil thermostat are simultaneously opened to heat the engine oil when the temperature of the engine oil is higher than the first threshold value and smaller than the second threshold value, because the temperature of the cooling liquid rises faster than the temperature of the engine oil; when the temperature of the engine oil rises above the second threshold value and below the third threshold value, the exhaust gas heating solenoid valve is started to be closed at this time for safety and the current capability of the cooling liquid to heat the engine oil; when the oil temperature rises above the fourth threshold, the opportunity oil temperature is thus already above the coolant temperature, at which point the oil thermostat is closed.
The beneficial effects obtained by the invention are as follows: when the temperature of engine oil in a lubricating system is too low, the viscosity of the engine oil is increased, and the friction resistance between each friction pair in the engine is increased; when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil temperature is raised by controlling the engine oil thermostat and using the cooling liquid to heat the engine oil, so that the viscosity of the engine oil is reduced, the thermal efficiency and the mechanical efficiency of the engine are improved, and the oil consumption is reduced; in addition, the tail gas can be utilized to heat engine oil, so that the system pressure of an engine lubricating system can be quickly built, and the economy of the engine is improved. The invention has the following advantages:
1. by utilizing the controllable characteristic of the engine oil thermostat, when the temperature of the cooling liquid is higher than the oil temperature in the cold starting and warm-up process of the engine and under the low-load working condition of the cold region, the opening of the engine oil thermostat is controlled, the engine oil is heated by the cooling liquid, and the temperature of the engine oil is raised;
2. when the temperature of the engine oil is far lower than the target engine oil temperature, the engine oil is heated by utilizing tail gas, so that the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured; the tail gas in the existing engine heat management is directly discharged to the atmosphere after post-treatment, and the energy in the tail gas is not fully utilized; when the temperature of the engine oil is far lower than the target engine oil temperature, the exhaust gas heating electromagnetic valve is used for controlling the branch pipe to be led out of the exhaust pipe to heat the engine oil in the oil pan, so that the engine oil can quickly reach the proper working temperature, and the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured.
3. Greatly shortens the warm-up time and improves the economy of the engine.
Drawings
FIGS. 1-2 are control schematic diagrams of the present invention;
fig. 3 is a control schematic in the warmed-up state;
fig. 4 is a control schematic diagram of the oil thermostat.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 3, the engine heat management control method of the present invention includes the steps of:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat; by utilizing the controllable characteristic of the engine oil thermostat, when the temperature of the cooling liquid is higher than the oil temperature in the cold starting and warm-up process of the engine and under the low-load working condition of the cold region, the opening of the engine oil thermostat is controlled, the engine oil is heated by the cooling liquid, and the temperature of the engine oil is raised;
s2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature; when the temperature of the engine oil is far lower than the target engine oil temperature, the engine oil is heated by utilizing tail gas, so that the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured; the tail gas in the existing engine heat management is directly discharged to the atmosphere after post-treatment, and the energy in the tail gas is not fully utilized; when the temperature of the engine oil is far lower than the target engine oil temperature, the exhaust gas heating electromagnetic valve is used for controlling the branch pipe to be led out of the exhaust pipe to heat the engine oil in the oil pan, so that the engine oil can quickly reach the proper working temperature, and the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured.
Embodiment one:
an engine thermal management control method, comprising the steps of:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat; the method comprises the following specific steps: the sensor obtains the real-time temperature of engine oil in the main oil duct and the real-time temperature of engine cooling liquid; comparing the real-time temperature of engine oil in the main oil duct with the real-time temperature of engine coolant, and adjusting the opening of the engine oil thermostat to be in a full-open state if the engine oil temperature is smaller than the coolant temperature; by utilizing the controllable characteristic of the engine oil thermostat, when the temperature of the cooling liquid is higher than the oil temperature in the cold starting and warm-up process of the engine and under the low-load working condition of the cold region, the opening of the engine oil thermostat is controlled, the engine oil is heated by the cooling liquid, and the temperature of the engine oil is raised;
s2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature; when the temperature of the engine oil is far lower than the target engine oil temperature, the engine oil is heated by utilizing tail gas, so that the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured; the tail gas in the existing engine heat management is directly discharged to the atmosphere after post-treatment, and the energy in the tail gas is not fully utilized; when the temperature of the engine oil is far lower than the target engine oil temperature, the exhaust gas heating electromagnetic valve is used for controlling the branch pipe to be led out of the exhaust pipe to heat the engine oil in the oil pan, so that the engine oil can quickly reach the proper working temperature, and the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured.
Embodiment two:
an engine thermal management control method, comprising the steps of:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat; the method comprises the following specific steps: the sensor obtains the real-time temperature of engine oil in the main oil duct and the real-time temperature of engine cooling liquid; comparing the real-time temperature of engine oil in the main oil duct with the real-time temperature of engine coolant, and adjusting the opening of the engine oil thermostat to be in a full-open state if the engine oil temperature is smaller than the coolant temperature; by utilizing the controllable characteristic of the engine oil thermostat, when the temperature of the cooling liquid is higher than the oil temperature in the cold starting and warm-up process of the engine and under the low-load working condition of the cold region, the opening of the engine oil thermostat is controlled, the engine oil is heated by the cooling liquid, and the temperature of the engine oil is raised;
a meets any of the conditions above: a. the engine is in a pre-starting state, the engine oil sensor is invalid, the temperature of the engine oil is overhigh, and the water temperature is higher than the oil temperature by a certain threshold value in the engine starting state; the duty ratio of the engine oil thermostat=0, the valve is fully closed, and the engine oil passes through the engine oil cooler;
s2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature; when the temperature of the engine oil is far lower than the target engine oil temperature, the engine oil is heated by utilizing tail gas, so that the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured; the tail gas in the existing engine heat management is directly discharged to the atmosphere after post-treatment, and the energy in the tail gas is not fully utilized; when the temperature of the engine oil is far lower than the target engine oil temperature, the exhaust gas heating electromagnetic valve is used for controlling the branch pipe to be led out of the exhaust pipe to heat the engine oil in the oil pan, so that the engine oil can quickly reach the proper working temperature, and the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured.
Embodiment III:
an engine thermal management control method, comprising the steps of:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat; the method comprises the following specific steps: the sensor obtains the real-time temperature of engine oil in the main oil duct and the real-time temperature of engine cooling liquid; comparing the real-time temperature of engine oil in the main oil duct with the real-time temperature of engine coolant, and adjusting the opening of the engine oil thermostat to be in a full-open state if the engine oil temperature is smaller than the coolant temperature; by utilizing the controllable characteristic of the engine oil thermostat, when the temperature of the cooling liquid is higher than the oil temperature in the cold starting and warm-up process of the engine and under the low-load working condition of the cold region, the opening of the engine oil thermostat is controlled, the engine oil is heated by the cooling liquid, and the temperature of the engine oil is raised;
a meets any of the conditions above: a. the engine is in a pre-starting state, the engine oil sensor is invalid, the temperature of the engine oil is overhigh, and the water temperature is higher than the oil temperature by a certain threshold value in the engine starting state; the duty ratio of the engine oil thermostat=0, the valve is fully closed, and the engine oil passes through the engine oil cooler;
b meets any of the conditions above: a. the engine is in a starting state, and the temperature of the engine oil is too low; the duty ratio of the engine oil thermostat=100, the valve is fully opened, and the engine oil does not pass through the engine oil cooler;
s2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature; when the temperature of the engine oil is far lower than the target engine oil temperature, the engine oil is heated by utilizing tail gas, so that the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured; the tail gas in the existing engine heat management is directly discharged to the atmosphere after post-treatment, and the energy in the tail gas is not fully utilized; when the temperature of the engine oil is far lower than the target engine oil temperature, the exhaust gas heating electromagnetic valve is used for controlling the branch pipe to be led out of the exhaust pipe to heat the engine oil in the oil pan, so that the engine oil can quickly reach the proper working temperature, and the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured.
Embodiment four:
an engine thermal management control method, comprising the steps of:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat; the method comprises the following specific steps: the sensor obtains the real-time temperature of engine oil in the main oil duct and the real-time temperature of engine cooling liquid; comparing the real-time temperature of engine oil in the main oil duct with the real-time temperature of engine coolant, and adjusting the opening of the engine oil thermostat to be in a full-open state if the engine oil temperature is smaller than the coolant temperature; by utilizing the controllable characteristic of the engine oil thermostat, when the temperature of the cooling liquid is higher than the oil temperature in the cold starting and warm-up process of the engine and under the low-load working condition of the cold region, the opening of the engine oil thermostat is controlled, the engine oil is heated by the cooling liquid, and the temperature of the engine oil is raised;
a meets any of the conditions above: a. the engine is in a pre-starting state, the engine oil sensor is invalid, the temperature of the engine oil is overhigh, and the water temperature is higher than the oil temperature by a certain threshold value in the engine starting state; the duty ratio of the engine oil thermostat=0, the valve is fully closed, and the engine oil passes through the engine oil cooler;
b meets any of the conditions above: a. the engine is in a starting state, and the temperature of the engine oil is too low; the duty ratio of the engine oil thermostat=100, the valve is fully opened, and the engine oil does not pass through the engine oil cooler;
A. b is not satisfied, and the duty ratio of the engine oil thermostat controls the opening of a valve according to PID;
s2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature; when the temperature of the engine oil is far lower than the target engine oil temperature, the engine oil is heated by utilizing tail gas, so that the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured; the tail gas in the existing engine heat management is directly discharged to the atmosphere after post-treatment, and the energy in the tail gas is not fully utilized; when the temperature of the engine oil is far lower than the target engine oil temperature, the exhaust gas heating electromagnetic valve is used for controlling the branch pipe to be led out of the exhaust pipe to heat the engine oil in the oil pan, so that the engine oil can quickly reach the proper working temperature, and the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured.
Fifth embodiment:
an engine thermal management control method, comprising the steps of:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat; the method comprises the following specific steps: the sensor obtains the real-time temperature of engine oil in the main oil duct and the real-time temperature of engine cooling liquid; comparing the real-time temperature of engine oil in the main oil duct with the real-time temperature of engine coolant, and adjusting the opening of the engine oil thermostat to be in a full-open state if the engine oil temperature is smaller than the coolant temperature; by utilizing the controllable characteristic of the engine oil thermostat, when the temperature of the cooling liquid is higher than the oil temperature in the cold starting and warm-up process of the engine and under the low-load working condition of the cold region, the opening of the engine oil thermostat is controlled, the engine oil is heated by the cooling liquid, and the temperature of the engine oil is raised;
a meets any of the conditions above: a. the engine is in a pre-starting state, the engine oil sensor is invalid, the temperature of the engine oil is overhigh, and the water temperature is higher than the oil temperature by a certain threshold value in the engine starting state; the duty ratio of the engine oil thermostat=0, the valve is fully closed, and the engine oil passes through the engine oil cooler;
b meets any of the conditions above: a. the engine is in a starting state, and the temperature of the engine oil is too low; the duty ratio of the engine oil thermostat=100, the valve is fully opened, and the engine oil does not pass through the engine oil cooler;
A. b is not satisfied, and the duty ratio of the engine oil thermostat controls the opening of a valve according to PID;
s2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature; the method comprises the following specific steps: the sensor obtains the real-time temperature of the engine oil in the oil pan, compares the difference value between the target temperature of the engine oil in the oil pan and the real-time temperature with an allowable difference value range, and adjusts the opening of the exhaust gas heating electromagnetic valve until the difference value between the real-time temperature and the target temperature is within the allowable difference value range if the difference value between the real-time temperature and the target temperature is not within the allowable range;
when the temperature of the engine oil is far lower than the target engine oil temperature, the engine oil is heated by utilizing tail gas, so that the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured; the tail gas in the existing engine heat management is directly discharged to the atmosphere after post-treatment, and the energy in the tail gas is not fully utilized; when the temperature of the engine oil is far lower than the target engine oil temperature, the exhaust gas heating electromagnetic valve is used for controlling the branch pipe to be led out of the exhaust pipe to heat the engine oil in the oil pan, so that the engine oil can quickly reach the proper working temperature, and the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured.
Example six:
an engine thermal management control method, comprising the steps of:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat; the method comprises the following specific steps: the sensor obtains the real-time temperature of engine oil in the main oil duct and the real-time temperature of engine cooling liquid; comparing the real-time temperature of engine oil in the main oil duct with the real-time temperature of engine coolant, and adjusting the opening of the engine oil thermostat to be in a full-open state if the engine oil temperature is smaller than the coolant temperature; by utilizing the controllable characteristic of the engine oil thermostat, when the temperature of the cooling liquid is higher than the oil temperature in the cold starting and warm-up process of the engine and under the low-load working condition of the cold region, the opening of the engine oil thermostat is controlled, the engine oil is heated by the cooling liquid, and the temperature of the engine oil is raised;
a meets any of the conditions above: a. the engine is in a pre-starting state, the engine oil sensor is invalid, the temperature of the engine oil is overhigh, and the water temperature is higher than the oil temperature by a certain threshold value in the engine starting state; the duty ratio of the engine oil thermostat=0, the valve is fully closed, and the engine oil passes through the engine oil cooler;
b meets any of the conditions above: a. the engine is in a starting state, and the temperature of the engine oil is too low; the duty ratio of the engine oil thermostat=100, the valve is fully opened, and the engine oil does not pass through the engine oil cooler;
A. b is not satisfied, and the duty ratio of the engine oil thermostat controls the opening of a valve according to PID;
s2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature; the method comprises the following specific steps: the sensor obtains the real-time temperature of the engine oil in the oil pan, compares the difference value between the target temperature of the engine oil in the oil pan and the real-time temperature with an allowable difference value range, and adjusts the opening of the exhaust gas heating electromagnetic valve until the difference value between the real-time temperature and the target temperature is within the allowable difference value range if the difference value between the real-time temperature and the target temperature is not within the allowable range;
c meets any of the conditions above: a. the engine is in a pre-starting state, b, the temperature discharge sensor is invalid, c, the temperature discharge is too high; duty ratio=0, the exhaust gas heating solenoid valve is fully closed, and the tail gas does not heat the engine oil;
when the temperature of the engine oil is far lower than the target engine oil temperature, the engine oil is heated by utilizing tail gas, so that the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured; the tail gas in the existing engine heat management is directly discharged to the atmosphere after post-treatment, and the energy in the tail gas is not fully utilized; when the temperature of the engine oil is far lower than the target engine oil temperature, the exhaust gas heating electromagnetic valve is used for controlling the branch pipe to be led out of the exhaust pipe to heat the engine oil in the oil pan, so that the engine oil can quickly reach the proper working temperature, and the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured.
Embodiment seven:
an engine thermal management control method, comprising the steps of:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat; the method comprises the following specific steps: the sensor obtains the real-time temperature of engine oil in the main oil duct and the real-time temperature of engine cooling liquid; comparing the real-time temperature of engine oil in the main oil duct with the real-time temperature of engine coolant, and adjusting the opening of the engine oil thermostat to be in a full-open state if the engine oil temperature is smaller than the coolant temperature; by utilizing the controllable characteristic of the engine oil thermostat, when the temperature of the cooling liquid is higher than the oil temperature in the cold starting and warm-up process of the engine and under the low-load working condition of the cold region, the opening of the engine oil thermostat is controlled, the engine oil is heated by the cooling liquid, and the temperature of the engine oil is raised;
a meets any of the conditions above: a. the engine is in a pre-starting state, the engine oil sensor is invalid, the temperature of the engine oil is overhigh, and the water temperature is higher than the oil temperature by a certain threshold value in the engine starting state; the duty ratio of the engine oil thermostat=0, the valve is fully closed, and the engine oil passes through the engine oil cooler;
b meets any of the conditions above: a. the engine is in a starting state, and the temperature of the engine oil is too low; the duty ratio of the engine oil thermostat=100, the valve is fully opened, and the engine oil does not pass through the engine oil cooler;
A. b is not satisfied, and the duty ratio of the engine oil thermostat controls the opening of a valve according to PID;
s2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature; the method comprises the following specific steps: the sensor obtains the real-time temperature of the engine oil in the oil pan, compares the difference value between the target temperature of the engine oil in the oil pan and the real-time temperature with an allowable difference value range, and adjusts the opening of the exhaust gas heating electromagnetic valve until the difference value between the real-time temperature and the target temperature is within the allowable difference value range if the difference value between the real-time temperature and the target temperature is not within the allowable range;
c meets any of the conditions above: a. the engine is in a pre-starting state, b, the temperature discharge sensor is invalid, c, the temperature discharge is too high; duty ratio=0, the exhaust gas heating solenoid valve is fully closed, and the tail gas does not heat the engine oil;
d meets any of the conditions above: a. the engine is in a starting state, and the temperature of the oil is too low; duty ratio=100, the exhaust gas heating solenoid valve is fully opened, and the tail gas heats the engine oil;
when the temperature of the engine oil is far lower than the target engine oil temperature, the engine oil is heated by utilizing tail gas, so that the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured; the tail gas in the existing engine heat management is directly discharged to the atmosphere after post-treatment, and the energy in the tail gas is not fully utilized; when the temperature of the engine oil is far lower than the target engine oil temperature, the exhaust gas heating electromagnetic valve is used for controlling the branch pipe to be led out of the exhaust pipe to heat the engine oil in the oil pan, so that the engine oil can quickly reach the proper working temperature, and the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured.
Example eight:
an engine thermal management control method, comprising the steps of:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat; the method comprises the following specific steps: the sensor obtains the real-time temperature of engine oil in the main oil duct and the real-time temperature of engine cooling liquid; comparing the real-time temperature of engine oil in the main oil duct with the real-time temperature of engine coolant, and adjusting the opening of the engine oil thermostat to be in a full-open state if the engine oil temperature is smaller than the coolant temperature; by utilizing the controllable characteristic of the engine oil thermostat, when the temperature of the cooling liquid is higher than the oil temperature in the cold starting and warm-up process of the engine and under the low-load working condition of the cold region, the opening of the engine oil thermostat is controlled, the engine oil is heated by the cooling liquid, and the temperature of the engine oil is raised;
a meets any of the conditions above: a. the engine is in a pre-starting state, the engine oil sensor is invalid, the temperature of the engine oil is overhigh, and the water temperature is higher than the oil temperature by a certain threshold value in the engine starting state; the duty ratio of the engine oil thermostat=0, the valve is fully closed, and the engine oil passes through the engine oil cooler;
b meets any of the conditions above: a. the engine is in a starting state, and the temperature of the engine oil is too low; the duty ratio of the engine oil thermostat=100, the valve is fully opened, and the engine oil does not pass through the engine oil cooler;
A. b is not satisfied, and the duty ratio of the engine oil thermostat controls the opening of a valve according to PID;
s2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature; the method comprises the following specific steps: the sensor obtains the real-time temperature of the engine oil in the oil pan, compares the difference value between the target temperature of the engine oil in the oil pan and the real-time temperature with an allowable difference value range, and adjusts the opening of the exhaust gas heating electromagnetic valve until the difference value between the real-time temperature and the target temperature is within the allowable difference value range if the difference value between the real-time temperature and the target temperature is not within the allowable range;
c meets any of the conditions above: a. the engine is in a pre-starting state, b, the temperature discharge sensor is invalid, c, the temperature discharge is too high; duty ratio=0, the exhaust gas heating solenoid valve is fully closed, and the tail gas does not heat the engine oil;
d meets any of the conditions above: a. the engine is in a starting state, and the temperature of the oil is too low; duty ratio=100, the exhaust gas heating solenoid valve is fully opened, and the tail gas heats the engine oil;
C. d, the duty ratio of the waste gas heating electromagnetic valve is controlled according to PID;
when the temperature of the engine oil is far lower than the target engine oil temperature, the engine oil is heated by utilizing tail gas, so that the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured; the tail gas in the existing engine heat management is directly discharged to the atmosphere after post-treatment, and the energy in the tail gas is not fully utilized; when the temperature of the engine oil is far lower than the target engine oil temperature, the exhaust gas heating electromagnetic valve is used for controlling the branch pipe to be led out of the exhaust pipe to heat the engine oil in the oil pan, so that the engine oil can quickly reach the proper working temperature, and the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured.
Example nine:
an engine thermal management control method, comprising the steps of:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat; the method comprises the following specific steps: the sensor obtains the real-time temperature of engine oil in the main oil duct and the real-time temperature of engine cooling liquid; comparing the real-time temperature of engine oil in the main oil duct with the real-time temperature of engine coolant, and adjusting the opening of the engine oil thermostat to be in a full-open state if the engine oil temperature is smaller than the coolant temperature; by utilizing the controllable characteristic of the engine oil thermostat, when the temperature of the cooling liquid is higher than the oil temperature in the cold starting and warm-up process of the engine and under the low-load working condition of the cold region, the opening of the engine oil thermostat is controlled, the engine oil is heated by the cooling liquid, and the temperature of the engine oil is raised;
a meets any of the conditions above: a. the engine is in a pre-starting state, the engine oil sensor is invalid, the temperature of the engine oil is overhigh, and the water temperature is higher than the oil temperature by a certain threshold value in the engine starting state; the duty ratio of the engine oil thermostat=0, the valve is fully closed, and the engine oil passes through the engine oil cooler;
b meets any of the conditions above: a. the engine is in a starting state, and the temperature of the engine oil is too low; the duty ratio of the engine oil thermostat=100, the valve is fully opened, and the engine oil does not pass through the engine oil cooler;
A. b is not satisfied, and the duty ratio of the engine oil thermostat controls the opening of a valve according to PID;
the aperture of the engine oil thermostat is controlled by feedforward and PID, and a specific control strategy is shown in figure 4;
s2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature; the method comprises the following specific steps: the sensor obtains the real-time temperature of the engine oil in the oil pan, compares the difference value between the target temperature of the engine oil in the oil pan and the real-time temperature with an allowable difference value range, and adjusts the opening of the exhaust gas heating electromagnetic valve until the difference value between the real-time temperature and the target temperature is within the allowable difference value range if the difference value between the real-time temperature and the target temperature is not within the allowable range; and determining the target engine oil temperature by using the cooling liquid temperature, wherein different cooling liquid temperatures correspond to different target temperatures, the target engine oil temperature is low when the water temperature is high, and the target engine oil temperature is high when the water temperature is low.
C meets any of the conditions above: a. the engine is in a pre-starting state, b, the temperature discharge sensor is invalid, c, the temperature discharge is too high; duty ratio=0, the exhaust gas heating solenoid valve is fully closed, and the tail gas does not heat the engine oil;
d meets any of the conditions above: a. the engine is in a starting state, and the temperature of the oil is too low; duty ratio=100, the exhaust gas heating solenoid valve is fully opened, and the tail gas heats the engine oil;
C. d, the duty ratio of the waste gas heating electromagnetic valve is controlled according to PID;
and controlling the opening of the exhaust gas heating electromagnetic valve by adopting an empirical fit formula, wherein the specific formula is as follows:
wherein: de is the opening of the exhaust gas heating electromagnetic valve; to is the engine oil temperature; te is the tail gas temperature; fe is the tail gas flow; lo is the oil level; m is m 1 、n 1 ～n 4 Is a constant coefficient;
when the temperature of the engine oil is far lower than the target engine oil temperature, the engine oil is heated by utilizing tail gas, so that the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured; the tail gas in the existing engine heat management is directly discharged to the atmosphere after post-treatment, and the energy in the tail gas is not fully utilized; when the temperature of the engine oil is far lower than the target engine oil temperature, the exhaust gas heating electromagnetic valve is used for controlling the branch pipe to be led out of the exhaust pipe to heat the engine oil in the oil pan, so that the engine oil can quickly reach the proper working temperature, and the exhaust energy is fully utilized, and the safe and efficient operation of an engine lubricating system is ensured.
In the warm state, the opening of the engine oil thermostat is controlled according to the temperature of engine oil, and when the temperature of engine oil is a first threshold value, only the exhaust gas heating electromagnetic valve is opened, so that the engine oil cannot be heated by the cooling liquid because the temperature of the cooling liquid is not greatly different from the temperature of the engine oil at present; when the temperature of the engine oil rises, the exhaust gas heating electromagnetic valve and the engine oil thermostat are simultaneously opened to heat the engine oil when the temperature of the engine oil is higher than the first threshold value and smaller than the second threshold value, because the temperature of the cooling liquid rises faster than the temperature of the engine oil; when the temperature of the engine oil rises above the second threshold value and below the third threshold value, the exhaust gas heating solenoid valve is started to be closed at this time for safety and the current capability of the cooling liquid to heat the engine oil; when the oil temperature rises above the fourth threshold, the opportunity oil temperature is thus already above the coolant temperature, at which point the oil thermostat is closed.
The foregoing has shown and described the basic principles and main structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Here, it should be noted that the description of the above technical solution is exemplary, and the present specification may be embodied in different forms and should not be construed as being limited to the technical solution set forth herein. Rather, these descriptions will be 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 invention is limited only by the scope of the claims.
Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the invention is not limited to the above-described embodiments, but many variations are possible. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention should be considered to be within the scope of the present invention.
Claims (10)
1. A heat management control method of an engine is characterized in that: the method comprises the following steps:
s1, when the temperature of the cooling liquid is higher than the temperature of engine oil, the engine oil is heated by the cooling liquid by controlling an engine oil thermostat;
and S2, heating the engine oil by utilizing tail gas when the engine oil temperature is lower than the target engine oil temperature.
2. The engine heat management control method according to claim 1, characterized in that: s1 comprises the following specific steps: the sensor obtains the real-time temperature of engine oil in the main oil duct and the real-time temperature of engine cooling liquid; and comparing the real-time temperature of the engine oil in the main oil duct with the real-time temperature of the engine coolant, and adjusting the opening of the engine oil thermostat to be in a full-open state if the engine oil temperature is smaller than the coolant temperature.
3. The engine heat management control method according to claim 2, characterized in that: a meets any of the conditions above: a. the engine is in a pre-starting state, the engine oil sensor is invalid, the temperature of the engine oil is overhigh, and the water temperature is higher than the oil temperature by a certain threshold value in the engine starting state; the engine oil thermostat duty cycle=0, the valve is fully closed, and the engine oil passes through the engine oil cooler.
4. The engine heat management control method according to claim 3, characterized in that: b meets any of the conditions above: a. the engine is in a starting state, and the temperature of the engine oil is too low; the oil thermostat duty cycle=100, the valve is fully open and the oil does not pass through the oil cooler.
5. The engine heat management control method according to claim 4, characterized in that: A. and B, the duty ratio of the engine oil thermostat is not satisfied, and the opening of the valve is controlled according to PID.
6. The engine heat management control method according to claim 1, characterized in that: s2, the specific steps are as follows: the sensor obtains the real-time temperature of the engine oil in the oil pan, compares the difference value between the target temperature of the engine oil in the oil pan and the real-time temperature with an allowable difference value range, and adjusts the opening of the exhaust gas heating electromagnetic valve until the difference value between the real-time temperature and the target temperature falls within the allowable difference value range if the difference value between the real-time temperature and the target temperature is not within the allowable range.
7. The engine heat management control method according to claim 6, characterized in that: c meets any of the conditions above: a. the engine is in a pre-starting state, b, the temperature discharge sensor is invalid, c, the temperature discharge is too high; duty ratio=0, the exhaust gas heating solenoid valve is fully closed, and the exhaust gas does not heat the engine oil.
8. The engine heat management control method according to claim 7, characterized in that: d meets any of the conditions above: a. the engine is in a starting state, and the temperature of the oil is too low; duty ratio=100, and exhaust gas heating solenoid valve is fully opened, and exhaust gas heats the engine oil.
9. The engine thermal management control method according to claim 8, characterized in that: C. d is not satisfied, and the duty ratio of the exhaust gas heating electromagnetic valve is controlled according to the PID.
10. The engine heat management control method according to claim 1, characterized in that: in the warm state, the opening of the engine oil thermostat is controlled according to the temperature of engine oil, and when the temperature of engine oil is a first threshold value, only the exhaust gas heating electromagnetic valve is opened, so that the engine oil cannot be heated by the cooling liquid because the temperature of the cooling liquid is not greatly different from the temperature of the engine oil at present; when the temperature of the engine oil rises, the exhaust gas heating electromagnetic valve and the engine oil thermostat are simultaneously opened to heat the engine oil when the temperature of the engine oil is higher than the first threshold value and smaller than the second threshold value, because the temperature of the cooling liquid rises faster than the temperature of the engine oil; when the temperature of the engine oil rises above the second threshold value and below the third threshold value, the exhaust gas heating solenoid valve is started to be closed at this time for safety and the current capability of the cooling liquid to heat the engine oil; when the oil temperature rises above the fourth threshold, the opportunity oil temperature is thus already above the coolant temperature, at which point the oil thermostat is closed.
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| CN117627798A (en) * | 2024-01-26 | 2024-03-01 | 潍柴动力股份有限公司 | Control method and control system of extended-range engine, extended-range engine and vehicle |
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| CN117627798A (en) * | 2024-01-26 | 2024-03-01 | 潍柴动力股份有限公司 | Control method and control system of extended-range engine, extended-range engine and vehicle |
| CN117627798B (en) * | 2024-01-26 | 2024-05-17 | 潍柴动力股份有限公司 | Control method and control system of extended-range engine, extended-range engine and vehicle |
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