CN111305963A - Torque output control method, device, equipment and storage medium for vehicle - Google Patents

Torque output control method, device, equipment and storage medium for vehicle Download PDF

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Publication number
CN111305963A
CN111305963A CN202010066153.1A CN202010066153A CN111305963A CN 111305963 A CN111305963 A CN 111305963A CN 202010066153 A CN202010066153 A CN 202010066153A CN 111305963 A CN111305963 A CN 111305963A
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China
Prior art keywords
torque
threshold
throttle opening
liquid temperature
temperature
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CN202010066153.1A
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Chinese (zh)
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CN111305963B (en
Inventor
李广彦
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Chery Automobile Co Ltd
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Chery Automobile Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/023—Temperature of lubricating oil or working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1002—Output torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The application discloses a torque output control method, a torque output control device, torque output control equipment and a torque output control storage medium of a vehicle, which are applied to the technical field of vehicles, wherein the method comprises the following steps: acquiring real-time liquid temperature and rotating speed in an engine and acquiring a real-time throttle opening value of the engine; in response to the liquid temperature being less than a first threshold, determining a first torque corresponding to the rotational speed and the throttle opening value based on a first mapping relationship, and adjusting the throttle opening based on the first torque to output a first desired torque; in response to the liquid temperature being greater than a second threshold, determining a second torque corresponding to the rotation speed and the throttle opening value based on a second mapping relation, and adjusting the throttle opening based on the second torque to output a second desired torque; the first torque is larger than the first expected torque, so that the output loss of the torque is compensated through the first torque, and the purposes of adjusting the throttle opening degree based on the first torque and outputting the expected torque are achieved.

Description

Torque output control method, device, equipment and storage medium for vehicle
Technical Field
The present disclosure relates to vehicle technologies, and in particular, to a method, an apparatus, a device, and a storage medium for controlling torque output of a vehicle.
Background
In the motion control of the vehicle, the electronic accelerator may be used to control the throttle opening of the engine, and thus the torque output of the vehicle.
Illustratively, the electronic accelerator collects displacement information of an accelerator pedal through a displacement sensor arranged on the accelerator pedal, an electronic control unit of the engine determines a desired torque by combining the displacement information, the current wheel rotating speed, the current throttle opening of the engine and other information, and controls the throttle opening based on the desired torque to obtain an output of the desired torque.
However, in a low-temperature environment, the viscosity of the engine oil and the transmission oil increases due to the temperature, and therefore the self-resistance of the engine and the transmission increases, and finally, a torque output loss occurs.
Disclosure of Invention
The embodiment of the application provides a torque output control method, a torque output control device, torque output control equipment and a torque output control storage medium of a vehicle, which can compensate output torque loss caused by high viscosity of engine oil and gearbox oil in a low-temperature environment, so that an effect of outputting expected torque is achieved. The technical scheme is as follows:
according to one aspect of the present application, there is provided a torque output control method of a vehicle, applied to an electronic control unit of the vehicle, the method including:
acquiring real-time liquid temperature and rotating speed in an engine and acquiring a real-time throttle opening value of the engine;
determining a first torque corresponding to the rotation speed and the throttle opening value based on the first mapping relation in response to the liquid temperature being less than the first threshold value; adjusting the throttle opening degree based on the first torque to output a first expected torque, wherein the first expected torque refers to a theoretical torque corresponding to the throttle opening degree value when the liquid temperature is smaller than a first threshold value;
determining a second torque corresponding to the rotation speed and the throttle opening value based on a second mapping relation in response to the liquid temperature being greater than a second threshold value; adjusting the throttle opening degree based on the second torque to output a second expected torque, wherein the second expected torque is a theoretical torque corresponding to the throttle opening degree value when the liquid temperature is greater than a second threshold value;
wherein the first desired torque is less than the first torque and the first threshold is less than or equal to the second threshold.
In some embodiments, the first threshold is less than the second threshold;
the method further comprises the following steps:
in response to the liquid temperature being greater than the first threshold and less than the second threshold, determining a third torque corresponding to the liquid temperature based on a preset proportional relationship;
adjusting the throttle opening based on the third torque;
the preset proportional relation refers to an inverse relation between preset liquid temperature and torque, and the third torque is smaller than the torque corresponding to the first threshold in the first mapping relation and larger than the torque corresponding to the second threshold in the second mapping relation.
In some embodiments, the first mapping includes a three-dimensional control plot of torque at low temperatures;
determining a first torque corresponding to the rotational speed and the throttle opening value based on a first mapping relationship, comprising:
and searching a first torque corresponding to the rotating speed and the throttle opening value based on the three-dimensional control curve graph.
N temperature ranges are set in the electronic control unit, and the ith temperature range corresponds to the ith mapping relation;
before determining the first torque corresponding to the rotating speed and the throttle opening value based on the first mapping relation, the method comprises the following steps:
determining the ith mapping relation as a first mapping relation in response to the liquid temperature belonging to the ith temperature range;
wherein i is less than or equal to n, i and n are positive integers, and the temperature values in the n temperature ranges are all less than a first threshold value.
In some embodiments, the liquid temperature includes at least one of an oil temperature and a water temperature within the engine.
According to another aspect of the present application, there is provided a torque output control apparatus of a vehicle, the apparatus including:
the acquisition module is used for acquiring the real-time liquid temperature and the rotating speed in the engine and acquiring the real-time throttle opening value of the engine;
the adjusting module is used for determining a first torque corresponding to the rotating speed and the throttle opening value based on a first mapping relation in response to the liquid temperature being smaller than a first threshold value; adjusting the throttle opening degree based on the first torque to output a first expected torque, wherein the first expected torque refers to a theoretical torque corresponding to the throttle opening degree value when the liquid temperature is smaller than a first threshold value;
the adjusting module is used for determining a second torque corresponding to the rotating speed and the throttle opening value based on a second mapping relation in response to the liquid temperature being larger than a second threshold value; adjusting the throttle opening degree based on the second torque to output a second expected torque, wherein the second expected torque is a theoretical torque corresponding to the throttle opening degree value when the liquid temperature is greater than a second threshold value;
wherein the first desired torque is less than the first torque and the first threshold is less than or equal to the second threshold.
In some embodiments, the first threshold is less than the second threshold;
the device also includes:
the adjusting module is used for determining a third torque corresponding to the liquid temperature based on a preset proportional relation in response to the liquid temperature being greater than the first threshold and smaller than the second threshold; adjusting the throttle opening based on the third torque;
the preset proportional relation refers to an inverse relation between preset liquid temperature and torque, and the third torque is smaller than the torque corresponding to the first threshold in the first mapping relation and larger than the torque corresponding to the second threshold in the second mapping relation.
In some embodiments, the first mapping includes a three-dimensional control plot of torque at low temperatures;
and the adjusting module is used for searching a first torque corresponding to the rotating speed and the throttle opening value based on the three-dimensional control curve graph.
In some embodiments, n temperature ranges are set in the electronic control unit, and the ith temperature range corresponds to the ith mapping relation;
the adjusting module is used for responding to the fact that the liquid temperature belongs to the ith temperature range, and determining the ith mapping relation as a first mapping relation; wherein i is less than or equal to n, i and n are positive integers, and the temperature values in the n temperature ranges are all less than a first threshold value.
In some embodiments, the liquid temperature includes at least one of an oil temperature and a water temperature within the engine.
According to another aspect of the present application, there is provided an electronic control unit of a vehicle, the electronic control unit including:
a memory;
a processor coupled to the memory;
the processor is configured to load and execute the executable instructions in the memory to implement the torque output control method of the vehicle according to the above aspect.
According to another aspect of the present application, there is provided a computer readable storage medium having at least one instruction, at least one program, set of codes, or set of instructions stored therein, which is loaded and executed by a processor to implement the torque output control method of the vehicle according to the above aspect.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
under the low-temperature environment, engine oil and gearbox oil generate loss due to the fact that the viscosity of the engine oil and the gearbox oil is large, and the output torques of a transmitter and a gearbox are generated; the method comprises the steps of obtaining real-time liquid temperature and rotating speed in an engine and obtaining a real-time throttle opening value of the engine; when the liquid temperature is smaller than the first threshold value, namely in a low-temperature environment, a first torque corresponding to the rotating speed and the throttle opening value is determined based on the first mapping relation, and the output loss of the torque is compensated through the first torque larger than the first expected torque, so that the purposes of regulating the throttle opening based on the first torque and outputting the expected torque are achieved. And when the liquid temperature is higher than a second threshold value, determining a second torque corresponding to the rotating speed and the throttle opening value based on the second mapping relation, and adjusting the throttle opening based on the second torque to output a second expected torque, namely, torque output under the conditions of normal temperature and high temperature, wherein the first threshold value is smaller than or equal to the second threshold value.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic block diagram of a torque output control system for a vehicle provided in an exemplary embodiment of the present application;
FIG. 2 is a flow chart of a method of controlling torque output of a vehicle provided in an exemplary embodiment of the present application;
FIG. 3 is a flowchart of a torque output control method of a vehicle provided in another exemplary embodiment of the present application;
fig. 4 is a schematic structural diagram of a torque output control apparatus of a vehicle according to an exemplary embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The words involved in this application are to be interpreted as follows:
electronic throttle: which is an electronic control device that controls the throttle opening (i.e., the throttle opening of an engine) based on displacement information of an accelerator pedal, including the moving distance and moving speed of the accelerator pedal. The accelerator pedal is provided with a displacement sensor, and the displacement sensor is used for acquiring displacement information and sending the displacement information to the electronic control unit; the electronic control unit controls the micro engine according to the displacement information, and then drives the position of the throttle valve to adjust the opening of the throttle valve.
The engine controls the flow and the oil injection quantity of combustible mixed gas according to the opening of a throttle valve, and further controls the rotating speed and the power of the engine through the conversion between the heat energy and the kinetic energy after the oil is combusted; the rotational speed of the engine refers to the rotational speed of a crankshaft of the vehicle.
Torque: refers to the moment that causes the object to rotate. If the center of the rotating shaft is taken as a fulcrum, the product of the acting force on the circumference of the rotating object and the force arm is called torque, and the force arm is the distance between the center of the rotating shaft and the direction of the acting force. In the running process of the vehicle, the power of the engine is unchanged, and the torque of the engine and the rotating speed are in an inverse proportion relation; therefore, the control of the torque of the engine can be indirectly achieved by controlling the rotational speed of the engine.
Electronic Control Unit (ECU): the vehicle internal system control module is a control module of a vehicle internal system, and the main part of the vehicle internal system control module is a Central Processing Unit (CPU). Illustratively, the ECU may be used for engine control, such as ignition, throttle regulation, starter motor regulation, starter clutch regulation, fuel injection regulation, etc.; the method can also be used for continuously variable transmission control, automatic transmission control, driving force and antiskid control, vehicle body control, air bag self-diagnosis, explosion control and the like.
Engine oil: i.e. engine lubricating oil. The engine oil has the functions of lubrication, friction reduction, auxiliary cooling, rust prevention, corrosion prevention, cleaning, sealing, leakage prevention and shock absorption buffering. The viscosity of the engine oil is different at different temperatures; at low temperature, the viscosity of the engine oil is high, the fluidity is relatively poor, and the resistance of the engine is increased.
Gearbox oil: i.e. gearbox lubricating oil. The effects of the gearbox oil on the gearbox include lubrication, friction reduction and prolonging of the service life of the transmission device. The viscosity of the transmission oil is different at different temperatures; at low temperature, the viscosity of the gearbox oil is high, the fluidity is relatively poor, and the self resistance of the gearbox can be increased.
Referring to fig. 1, a schematic structural diagram of a torque output control system of a vehicle according to an exemplary embodiment of the present application is shown. The torque output control system of the vehicle includes a displacement sensor 10, a temperature sensor 20, a rotational speed measuring device 30, an ECU 40, a micro-engine 50, and an engine transmission system 60.
The displacement sensor 10 is arranged on an accelerator pedal and used for collecting displacement information triggered by a driver on the accelerator pedal, and the displacement information comprises the moving distance and the moving speed of the accelerator pedal.
The temperature sensor 20 is provided on the engine, and the temperature sensor 20 is enabled to collect the water temperature or the oil temperature of the engine at a fixed position on the engine.
A rotational speed measuring device 30 is provided on the crankshaft for measuring the rotational speed of the crankshaft, i.e., the rotational speed of the engine. The rotation speed measuring device 30 may be a signal panel, for example.
The ECU 40 includes a processor and a memory, and the processor may load a program from the memory to implement the torque output control method of the vehicle provided by the present application, thereby determining the throttle opening value, and controlling the micro-engine 50 to adjust the throttle opening based on the throttle opening value.
Illustratively, the ECU 40 determines an accelerator opening value input from an accelerator pedal by a driver based on the displacement information, determines a torque based on the accelerator opening value, an oil temperature (or a water temperature), and a rotation speed, adjusts the accelerator opening value based on the torque, and controls the micro-engine 50 to adjust the accelerator opening according to the adjusted accelerator opening value to output a desired torque.
After the throttle opening is adjusted, the engine transmission system 60 converts thermal energy and kinetic energy through oil combustion based on the current flow rate and the oil injection amount of the combustible mixture, thereby controlling the output of the torque of the engine and the transmission.
It should be noted that the torque output control system of the vehicle can be applied to any type of vehicle, such as a car or a train, to realize torque output control of the vehicle. For a detailed description of the torque output control method of the vehicle provided in the present application, reference is made to the following embodiments.
Under a low-temperature environment, engine oil and gearbox oil in an engine are in a condensation state under the influence of low temperature when a vehicle is started, the viscosity of the engine oil and the viscosity of the gearbox oil are high, and the engine oil and the gearbox oil are in a high-viscosity state within a period of time after the vehicle is started; the high viscosity of the engine oil can cause the resistance of the engine to increase, and the high viscosity of the gearbox oil can cause the resistance of the gearbox to increase, and finally, the torque output loss of the engine and the gearbox is caused. Accordingly, the present application provides a torque output control method for a vehicle, which is applied to an electronic control unit shown in fig. 1 to solve the above technical problems. Referring to fig. 1, a flowchart of a torque output control method of a vehicle according to an exemplary embodiment of the present application is shown, the method including:
step 201, acquiring the real-time liquid temperature and the rotating speed in the engine, and acquiring the real-time throttle opening value of the engine.
A temperature measuring device is arranged on an engine of the vehicle; the electronic control unit obtains the real-time liquid temperature and the rotating speed in the engine through the temperature measuring device. Illustratively, the temperature measuring device may include a temperature sensor, and the electronic control unit measures the temperature of the liquid in the engine in real time through the temperature sensor.
The vehicle is provided with a rotating speed measuring device of a crankshaft; the electronic control unit obtains the rotation speed of the crankshaft, namely the rotation speed of the engine, through a rotation speed measuring device.
The real-time accelerator opening value of the engine is an accelerator opening value input by a driver in real time through an electronic accelerator, and the electronic control unit acquires the accelerator opening value.
Optionally, the fluid temperature includes at least one of an oil temperature and a water temperature in the engine, and the fluid temperature is used to reflect the viscosity of the oil and the transmission oil.
In response to the fluid temperature being less than the first threshold, a first torque corresponding to the rotational speed and the throttle opening value is determined based on the first mapping, step 202.
A first threshold value is preset in the electronic control unit and is used for indicating the viscosity states of the engine oil and the transmission oil, and when the temperature of the liquid is lower than the first threshold value, the viscosity of the engine oil and the transmission oil influences the torque output, namely the torque output is lost.
The electronic control unit is also provided with a first mapping relation among the rotating speed, the throttle opening value and the torque; the electronic control unit determines a first torque corresponding to the rotational speed and the throttle opening value based on a first mapping relationship in response to the fluid temperature being less than a first threshold value.
Optionally, the viscosity of the engine oil and the transmission oil changes greatly along with the temperature change in a low temperature range, and accordingly the torque output loss of the vehicle also changes greatly, in order to compensate the torque output loss more accurately, n temperature ranges are further set in the electronic control unit, and the ith temperature range corresponds to the ith mapping relation; the electronic control unit responds to the fact that the liquid temperature belongs to the ith temperature range, and determines the ith mapping relation as a first mapping relation; the electronic control unit determines a first torque corresponding to the rotation speed and the accelerator opening value based on the determined first mapping relation.
TABLE 1
Temperature range Mapping relationships
Less than w1 Mapping relation 1
Is greater than or equal to w1Less than w2 Mapping relation 2
Is greater than or equal to w2And is less than w3 Mapping relation 3
Illustratively, the electronic control unit further stores a corresponding relationship table of temperature ranges and mapping relationships, as shown in table 1, the low temperature range is divided into three ranges corresponding to three mapping relationships, respectively, wherein if the liquid temperature is less than w1If the mapping relation 1 is the first mapping relation; if the liquid temperature is greater than or equal to w1Less than w2If so, the mapping relation 2 is the first mapping relation; if the liquid temperature is greater than or equal to w2And is less than w3If the mapping relation 3 is the first mappingRadial relationship, w3Namely the first threshold.
Optionally, the first mapping relationship includes a three-dimensional control MAP (i.e., a three-dimensional MAP) of torque at low temperature; the electronic control unit searches for a first torque corresponding to the rotation speed and the throttle opening value based on the three-dimensional control graph at the low temperature.
Step 203, adjusting the throttle opening based on the first torque to output a first desired torque.
The electronic control unit adjusts the throttle opening degree value based on the first torque and adjusts the throttle opening degree based on the adjusted throttle opening degree value to output a first expected torque; the first desired torque is a theoretical torque corresponding to the throttle opening value when the liquid temperature is less than the first threshold value. Wherein the first desired torque is less than the first torque.
In response to the fluid temperature being greater than or equal to the second threshold, a second torque corresponding to the rotational speed and the throttle opening value is determined based on the second mapping, step 204.
And a second threshold value is also preset in the electronic control unit, the second threshold value is used for indicating the viscosity states of the engine oil and the gearbox oil, and when the temperature of the liquid is greater than the second threshold value, the viscosity of the engine oil and the gearbox oil cannot cause torque output loss, or the torque output loss caused is very small and can be ignored. Optionally, the first threshold is less than or equal to the second threshold.
The electronic control unit is also provided with a second mapping relation among the rotating speed, the accelerator opening value and the torque, and the second mapping relation is different from the first mapping relation; the electronic control unit determines a second torque corresponding to the rotation speed and the throttle opening value based on a second mapping relation in response to the liquid temperature being greater than or equal to a second threshold value.
Optionally, the second mapping relationship includes a three-dimensional control curve of the torque at non-low temperatures (normal temperature and high temperature); the electronic control unit searches for a second torque corresponding to the rotation speed and the throttle opening value based on the three-dimensional control curve graph at the non-low temperature.
Step 205, the throttle opening is adjusted based on the second torque to output a second desired torque.
The electronic control unit adjusts the throttle opening degree value based on the second torque, adjusts the throttle opening degree based on the adjusted throttle opening degree value, and outputs a second expected torque; the second desired torque is a theoretical torque corresponding to the throttle opening value when the liquid temperature is greater than the second threshold value. Wherein the second desired torque is equal to or less than the second torque.
In summary, the torque output control method for the vehicle provided by the embodiment obtains the real-time liquid temperature and the real-time rotating speed in the engine, and obtains the real-time throttle opening value of the engine; when the liquid temperature is smaller than a first threshold value, namely in a low-temperature environment, a first torque corresponding to the rotating speed and the throttle opening value is determined based on a first mapping relation, and torque output loss is compensated through the first torque larger than a first expected torque, so that the purposes of regulating the throttle opening and outputting the expected torque based on the first torque are achieved, wherein the loss is torque output loss caused by high viscosity of engine oil and gearbox oil in the low-temperature environment. And when the liquid temperature is greater than or equal to a second threshold value, determining a second torque corresponding to the rotating speed and the throttle opening value based on the second mapping relation, and adjusting the throttle opening based on the second torque to output a second expected torque, namely, torque output under the conditions of normal temperature and high temperature, wherein the first threshold value is less than or equal to the second threshold value.
The method further subdivides a low-temperature range, and the mapping relations between the rotating speed and the accelerator opening degree values and the torque which are correspondingly arranged in different temperature ranges are different, so that the compensation of the torque output loss is more accurate.
Based on the embodiment shown in fig. 2, if the first threshold is smaller than the second threshold, there is a case that there is a torque difference between the torque corresponding to the first threshold and the torque corresponding to the second threshold, and in order to achieve a smooth transition of the torque in the temperature range between the first threshold and the second threshold, steps 206 to 207 are added on the basis of the embodiment shown in fig. 2, and schematically, as shown in fig. 3, the added steps are as follows:
in response to the liquid temperature being greater than or equal to the first threshold and less than the second threshold, a third torque corresponding to the liquid temperature is determined based on a preset proportional relationship, step 206.
The electronic control unit is internally provided with a preset proportional relation, and the preset proportional relation is an inverse proportion relation of the liquid temperature and the torque in a temperature range between the first threshold value and the second threshold value. Optionally, the preset proportional relationship includes a linear relationship.
Schematically, the linear relationship corresponding to the preset proportional relationship is as follows:
y＝ax+b；
wherein y represents the third torque, x represents the fluid temperature, and a, b represent proportionality coefficients. If the liquid temperature is x1Then, the third torque y ═ ax can be calculated by the above linear relation1+b。
Illustratively, the torque corresponding to the first threshold in the first mapping relationship is a fourth torque, and the torque corresponding to the second threshold in the second mapping relationship is a fifth torque, wherein the fourth torque is greater than the fifth torque, and the torque range corresponding to the temperature range between the first threshold and the second threshold is greater than or equal to the fifth torque and less than or equal to the fourth torque.
It should be further noted that a third mapping relationship between the liquid temperature and the torque in the temperature range between the first threshold and the second threshold is provided in the electronic control unit. Optionally, the third mapping relationship may include the preset proportional relationship; a temperature range versus torque mapping may also be included. Illustratively, if the third mapping relationship is a mapping relationship between a temperature range and a torque, the temperature range between the first threshold and the second threshold may be further divided into m range sections, and the jth range section corresponds to the jth candidate torque, where j is less than or equal to m, and j and m are positive integers. The electronic control unit determines a jth candidate torque as a third torque in response to the liquid temperature belonging to a jth range interval.
For example, as shown in Table 2, the first threshold value W1And a second threshold value W3The temperature range between the two is divided into 2 range intervals which are respectively more than or equal to W1Is less than W2I.e., [ W ]1，W2) (ii) a And W is not less than2Is less than W3I.e., [ W ]2，W3). Wherein, the range interval [ W1，W2) Corresponding candidate torque is k1Range interval [ W ]2，W3) Corresponding candidate torque is k2. When the liquid temperature W falls within the range [ W1，W2) Then k will be1Determining a third torque; when the liquid temperature W falls within the range [ W2，W3) Then k will be2A third torque is determined.
TABLE 2
Interval of range Candidate torque
[W1，W2) k1
[W2，W3) k2
Step 207, throttle opening is adjusted based on the third torque.
The electronic control unit adjusts the throttle opening degree value based on the third torque, and adjusts the throttle opening degree through the adjusted throttle opening degree value to output corresponding torque.
To sum up, the torque output control method for the vehicle further realizes the smooth transition of the torque in the temperature range by setting the mapping relation between the liquid temperature and the torque in the temperature range between the first threshold and the second threshold, avoids the sudden change of the torque output of the vehicle, and ensures the stability and the safety of the vehicle in running.
The following are embodiments of the apparatus of the present application, and for details that are not described in detail in the embodiments of the apparatus, reference may be made to corresponding descriptions in the above method embodiments, and details are not described herein again.
Referring to fig. 4, a schematic structural diagram of a torque output control apparatus of a vehicle according to an exemplary embodiment of the present application is shown. The device is applied to an electronic control unit of a vehicle, can be realized by software, hardware or a combination of the software and the hardware to be all or part of an automatic driving system, and comprises the following components:
the acquiring module 301 is used for acquiring the real-time liquid temperature and the rotating speed in the engine and acquiring the real-time throttle opening value of the engine;
an adjustment module 302 for determining a first torque corresponding to a rotational speed and an accelerator opening value based on a first mapping in response to a fluid temperature being less than a first threshold; adjusting the throttle opening degree based on the first torque to output a first expected torque, wherein the first expected torque refers to a theoretical torque corresponding to the throttle opening degree value when the liquid temperature is smaller than a first threshold value;
an adjustment module 302 for determining a second torque corresponding to the rotational speed and the throttle opening value based on a second mapping relationship in response to the fluid temperature being greater than a second threshold; adjusting the throttle opening degree based on the second torque to output a second expected torque, wherein the second expected torque is a theoretical torque corresponding to the throttle opening degree value when the liquid temperature is greater than a second threshold value;
wherein the first desired torque is less than the first torque and the first threshold is less than or equal to the second threshold.
In some embodiments, the first threshold is less than the second threshold;
the device also includes:
the adjusting module 302 is used for determining a third torque corresponding to the liquid temperature based on a preset proportional relation in response to the liquid temperature being greater than the first threshold and smaller than the second threshold; adjusting the throttle opening based on the third torque;
the preset proportional relation refers to an inverse relation between preset liquid temperature and torque, and the third torque is smaller than the torque corresponding to the first threshold in the first mapping relation and larger than the torque corresponding to the second threshold in the second mapping relation.
In some embodiments, the first mapping includes a three-dimensional control plot of torque at low temperatures;
an adjustment module 302 looks up a first torque corresponding to a rotational speed and an accelerator opening value based on a three-dimensional control graph.
In some embodiments, n temperature ranges are set in the electronic control unit, and the ith temperature range corresponds to the ith mapping relation;
an adjusting module 302, configured to determine an ith mapping relationship as a first mapping relationship in response to the liquid temperature belonging to an ith temperature range; wherein i is less than or equal to n, i and n are positive integers, and the temperature values in the n temperature ranges are all less than a first threshold value.
In some embodiments, the liquid temperature includes at least one of an oil temperature and a water temperature within the engine.
In summary, the torque output control device for the vehicle provided by the embodiment obtains the real-time liquid temperature and the real-time rotating speed in the engine, and obtains the real-time throttle opening value of the engine; when the liquid temperature is smaller than a first threshold value, namely in a low-temperature environment, a first torque corresponding to the rotating speed and the throttle opening value is determined based on a first mapping relation, and torque output loss is compensated through the first torque larger than a first expected torque, so that the purposes of regulating the throttle opening and outputting the expected torque based on the first torque are achieved, wherein the loss is torque output loss caused by high viscosity of engine oil and gearbox oil in the low-temperature environment. And when the liquid temperature is greater than or equal to a second threshold value, determining a second torque corresponding to the rotating speed and the throttle opening value based on the second mapping relation, and adjusting the throttle opening based on the second torque to output a second expected torque, namely, torque output under the conditions of normal temperature and high temperature, wherein the first threshold value is less than or equal to the second threshold value.
The present application also provides an electronic control unit of a vehicle, the electronic control unit including:
a memory;
a processor coupled to the memory;
the processor is configured to load and execute the executable instructions in the memory to implement the torque output control method of the vehicle provided by the above method embodiments.
The present application further provides a vehicle, provided with on this vehicle: a processor and a memory having stored therein at least one instruction, at least one program, set of codes, or set of instructions that is loaded and executed by the processor to implement a method of torque output control of a vehicle provided by the above-described method embodiments.
The present application further provides a computer readable storage medium having stored therein at least one instruction, at least one program, code set, or set of instructions that is loaded and executed by a processor to implement the method of torque output control of a vehicle provided by the above method embodiments.
It should be understood that reference to "a plurality" herein means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A torque output control method of a vehicle, applied to an electronic control unit of the vehicle, the method comprising:
acquiring real-time liquid temperature and rotating speed in an engine and acquiring a real-time throttle opening value of the engine;
determining a first torque corresponding to the rotational speed and the throttle opening value based on a first mapping relationship in response to the fluid temperature being less than a first threshold; adjusting throttle opening based on the first torque to output a first desired torque, the first desired torque being a theoretical torque corresponding to the throttle opening value when the liquid temperature is less than the first threshold;
determining a second torque corresponding to the rotational speed and the throttle opening value based on a second mapping relationship in response to the fluid temperature being greater than a second threshold value; adjusting the throttle opening degree based on the second torque to output a second expected torque, wherein the second expected torque is a theoretical torque corresponding to the throttle opening degree value when the liquid temperature is greater than the second threshold value;
wherein the first desired torque is less than the first torque, and the first threshold is less than or equal to the second threshold.
2. The method of claim 1, wherein the first threshold is less than the second threshold;
the method further comprises the following steps:
in response to the liquid temperature being greater than the first threshold and less than the second threshold, determining a third torque corresponding to the liquid temperature based on a preset proportional relationship;
adjusting the throttle opening based on the third torque;
the preset proportional relation refers to a preset inverse relation between the liquid temperature and the torque, and the third torque is smaller than the torque corresponding to the first threshold in the first mapping relation and larger than the torque corresponding to the second threshold in the second mapping relation.
3. The method of claim 1 or 2, wherein the first mapping includes a three-dimensional control plot of torque at low temperatures;
the determining a first torque corresponding to the rotational speed and the throttle opening value based on the first mapping relationship includes:
and searching the first torque corresponding to the rotating speed and the throttle opening value based on the three-dimensional control curve graph.
4. The method according to claim 1 or 2, wherein n temperature ranges are provided in the electronic control unit, wherein the ith temperature range corresponds to the ith mapping relation;
before determining the first torque corresponding to the rotating speed and the throttle opening value based on the first mapping relation, the method includes:
determining the ith mapping relationship as the first mapping relationship in response to the liquid temperature belonging to the ith temperature range;
wherein i is less than or equal to n, i and n are positive integers, and the temperature values in the n temperature ranges are all less than the first threshold value.
5. The method of claim 1 or 2, wherein the liquid temperature comprises at least one of an oil temperature and a water temperature within the engine.
6. A torque output control apparatus of a vehicle, characterized by comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the real-time liquid temperature and the rotating speed in an engine and acquiring the real-time throttle opening value of the engine;
the adjusting module is used for responding to the fact that the liquid temperature is smaller than a first threshold value, and determining a first torque corresponding to the rotating speed and the throttle opening value based on a first mapping relation; adjusting throttle opening based on the first torque to output a first desired torque, the first desired torque being a theoretical torque corresponding to the throttle opening value when the liquid temperature is less than the first threshold;
the adjusting module is used for determining a second torque corresponding to the rotating speed and the throttle opening value based on a second mapping relation in response to the liquid temperature being larger than a second threshold value; adjusting the throttle opening degree based on the second torque to output a second expected torque, wherein the second expected torque is a theoretical torque corresponding to the throttle opening degree value when the liquid temperature is greater than the second threshold value;
wherein the first desired torque is less than the first torque, and the first threshold is less than or equal to the second threshold.
7. The apparatus of claim 6, wherein the first threshold is less than the second threshold;
the device further comprises:
the adjusting module is used for determining a third torque corresponding to the liquid temperature based on a preset proportional relation in response to the liquid temperature being greater than the first threshold and smaller than the second threshold; adjusting the throttle opening based on the third torque;
the preset proportional relation refers to a preset inverse relation between the liquid temperature and the torque, and the third torque is smaller than the torque corresponding to the first threshold in the first mapping relation and larger than the torque corresponding to the second threshold in the second mapping relation.
8. The apparatus of claim 1 or 2, wherein the first mapping includes a three-dimensional control plot of torque at low temperatures;
the adjusting module is used for searching the first torque corresponding to the rotating speed and the throttle opening value based on the three-dimensional control curve graph.
9. An electronic control unit of a vehicle, characterized by comprising:
a memory;
a processor coupled to the memory;
the processor configured to load and execute the executable instructions in the memory to implement the torque output control method of the vehicle of any one of claims 1 to 5.
10. A computer readable storage medium having stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, which is loaded and executed by a processor to implement a torque output control method of a vehicle according to any one of claims 1 to 5.
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