CN115182822B - Torque control method and system for commercial vehicle - Google Patents
Torque control method and system for commercial vehicle Download PDFInfo
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- CN115182822B CN115182822B CN202210957114.XA CN202210957114A CN115182822B CN 115182822 B CN115182822 B CN 115182822B CN 202210957114 A CN202210957114 A CN 202210957114A CN 115182822 B CN115182822 B CN 115182822B
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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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
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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
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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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
- F02D41/30—Controlling fuel injection
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
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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
- F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
- F02D2700/07—Automatic control systems according to one of the preceding groups in combination with control of the mechanism receiving the engine power
Abstract
The invention discloses a torque control method and a torque control system for a commercial vehicle, wherein the method comprises the steps of collecting a driver intention signal, and obtaining a first torque according to the driver intention signal and an oil saving strategy; the first torque is sent to the engine control equipment, so that the engine control equipment obtains the engine torque according to the first torque, the node torque, the cruising torque and the speed limiting torque, and controls the engine according to the engine torque; the node torque is generated by the vehicle body node according to the node function strategy and is sent to the engine control equipment. The embodiment optimizes the architecture of a complete Vehicle Controller (VCU) of the commercial vehicle, shortens the development period, and improves the fuel-saving effect and the fuel economy of the complete vehicle.
Description
Technical Field
The invention relates to the field of control of commercial vehicles, in particular to a torque control method and a torque control system of a commercial vehicle.
Background
The commercial vehicles have more vehicle types and various parts, so the conventional commercial vehicles have fewer configuration Vehicle Controllers (VCUs), the VCUs are mainly used for coordination and control of vehicle power systems in part of the commercial vehicles, torque and rotation speed are controlled from the angle of the whole vehicle, driver feeling is improved, oil consumption is a large disadvantage of the commercial vehicles, and the conventional VCUs lack corresponding improvement on the oil consumption related performance of the commercial vehicles.
At present, in a network architecture of an existing Vehicle Control Unit (VCU), the VCU separates an engine controller ECU from other nodes, the VCU needs to transmit messages of the other nodes to interact with the ECU, and the VCU needs to arbitrate torque of each node (ABS, ECS, RCU, AMT) and the like. Therefore, the development period and risk of the VCU are greatly increased, and the VCU does not have the function of saving oil, so that the intelligent reduction of the oil consumption of the commercial vehicle cannot be realized.
Disclosure of Invention
The invention provides a torque control method and a torque control system for a commercial vehicle, which optimize the architecture of a whole Vehicle Controller (VCU) of the commercial vehicle, shorten the development period and improve the oil saving effect and the fuel economy of the whole vehicle.
In order to solve the above technical problems, an embodiment of the present invention provides a method and a system for controlling torque of a commercial vehicle, including
Acquiring a driver intention signal, and acquiring a first torque according to the driver intention signal and an oil saving strategy;
the first torque is sent to the engine control equipment, so that the engine control equipment obtains the engine torque according to the first torque, the node torque, the cruising torque and the speed limiting torque, and controls the engine according to the engine torque; the node torque is generated by the vehicle body node according to the node function strategy and is sent to the engine control equipment.
According to the embodiment of the invention, a commercial Vehicle Controller (VCU) collects driver intention signals, and combines an oil saving strategy to obtain first torque, and an engine control device ECU obtains engine torque according to the first torque, node torque, cruising torque and speed limiting torque to realize engine control, wherein the VCU does not arbitrate the torque in the engine torque calculation process, but the ECU arbitrates the node torque, so that a mature ECU torque arbitration strategy is maintained. The VCU manages the torque of the driver intention signal, optimizes the architecture of a complete Vehicle Controller (VCU) of the commercial vehicle, shortens the development period of the complete vehicle and reduces the software risk. Meanwhile, the required torque of the driving behavior of the driver is optimized, an oil saving strategy is formulated, and the oil saving effect and the fuel economy of the whole vehicle are improved.
As a preferred scheme, a driver intention signal is collected, and a first torque is obtained according to the driver intention signal and an oil saving strategy, specifically:
collecting a driver intention signal, and calculating an initial torque according to the driver intention signal;
calculating the stable accelerator torque according to the initial torque and the stable accelerator strategy;
calculating smooth control torque according to the stable accelerator torque and the smooth control strategy;
the first torque is calculated according to the smoothing control torque and the torque filtering strategy.
By implementing the embodiment of the invention, the oil saving strategy comprises an accelerator stabilizing strategy, a smooth control strategy and a torque filtering strategy, oil saving is realized through the accelerator stabilizing strategy and the smooth control strategy, the torque filtering strategy realizes smooth torque, oil saving calculation of initial torque is started from the torque requirement, and oil saving of the whole vehicle is realized.
As a preferred solution, a driver intention signal is collected, and an initial torque is calculated according to the driver intention signal, specifically:
collecting a driver intention signal, generating a two-dimensional MAP according to an accelerator pedal and a vehicle speed, and detecting an initial torque according to the driver intention signal and the two-dimensional MAP; the driver intention signals comprise an accelerator opening signal, a brake signal, a gear hard wire signal, an engine control starting signal and a vehicle speed signal.
As a preferred scheme, according to the initial torque and the throttle stabilizing strategy, the throttle stabilizing torque is calculated, specifically:
judging whether the commercial vehicle enters a stable accelerator mode according to the current vehicle speed, the accelerator pedal opening value and the accelerator pedal change rate, if so, setting a current maximum torque value according to the initial torque, setting the stable accelerator torque value to be equal to the current maximum torque value, and if not, setting the stable accelerator torque value to be equal to the initial torque value.
By implementing the embodiment of the invention, whether the commercial vehicle enters the throttle stabilizing mode is identified, the initial torque is adjusted according to the judging result, the driver does not have the intention of accelerating, the torque is limited by stabilizing the vehicle speed or the throttle, high-power consumption is avoided, the initial torque is smoothly output, the behavior of the driver is indirectly restrained, and the oil consumption is reduced.
As a preferred scheme, according to the stable accelerator torque and the smooth control strategy, calculating the smooth control torque specifically comprises:
and judging whether the commercial vehicle enters a smooth control mode according to the current vehicle speed and the instant fuel consumption, if so, correcting the smooth coefficient of the stable accelerator torque to obtain smooth control torque, and if not, setting the value of the smooth control torque to be equal to the value of the stable accelerator torque.
By implementing the embodiment of the invention, whether the commercial vehicle enters a smooth control mode is identified, so that the torque is smoothly output when the vehicle is in a working condition with high fuel consumption output, and the instantaneous fuel consumption is reduced.
As a preferred solution, according to the smoothing control torque and the torque filtering strategy, the first torque is calculated, specifically:
and carrying out low-pass filtering on the smooth control torque to obtain a first torque.
By implementing the embodiment of the invention, the torque is smoothly output through low-pass filtering, the abrupt change condition is avoided, and the comfort of the whole vehicle is improved.
Preferably, the first torque is sent to the engine control device, so that the engine control device obtains the engine torque according to the first torque, the node torque, the cruising torque and the speed limiting torque, and controls the engine according to the engine torque; the node torque is generated by a vehicle body node according to a node function strategy and is sent to engine control equipment; the method comprises the following steps:
and sending the first torque to the engine control equipment so that the engine control equipment synthesizes the first torque, the node torque, the cruising torque and the speed limiting torque, performs torque arbitration processing to obtain the engine torque, converts the engine torque into an oil injection quantity, and controls the engine.
The node torque is generated by a vehicle body node according to a node function strategy and is sent to engine control equipment; the vehicle body node comprises an automatic gearbox controller, a retarder controller, an automobile anti-lock system, a vehicle body stabilizing system, an automobile anti-skid regulating system and an active tracking control system.
In order to solve the same technical problem, the embodiment of the invention further provides a torque control system of a commercial vehicle, which comprises: the system comprises a whole vehicle controller, node equipment and engine control equipment; the whole vehicle controller executes a torque control method of the commercial vehicle;
wherein the connection of the devices is as follows: the whole vehicle controller is connected with the engine control equipment, and the node equipment is connected with the engine control equipment.
As a preferred scheme, the whole vehicle controller is used for collecting a driver intention signal, obtaining a first torque according to the driver intention signal and an oil saving strategy, and sending the first torque to the engine control equipment;
the node equipment is used for generating node torque according to the node function strategy and sending the node torque to the engine control equipment;
the engine control device is used for obtaining engine torque according to the first torque, the node torque, the cruising torque and the speed limiting torque, and controlling the engine according to the engine torque.
As a preferable scheme, the whole vehicle controller comprises an initial torque module, a throttle stabilizing torque module, a smooth control torque module and a filtering module;
the initial torque module is used for collecting a driver intention signal and calculating initial torque according to the driver intention signal;
the throttle stabilizing torque module is used for calculating throttle stabilizing torque according to the initial torque and the throttle stabilizing strategy;
the smooth control torque module is used for calculating smooth control torque according to the stable accelerator torque and the smooth control strategy;
the filtering module is used for calculating the first torque according to the smooth control torque and the torque filtering strategy.
Drawings
Fig. 1: a schematic flow chart of an embodiment of a torque control method for a commercial vehicle is provided;
fig. 2: the VCU torque architecture diagram of one embodiment of the torque control method for the commercial vehicle provided by the invention;
fig. 3: the whole vehicle torque structure diagram of one embodiment of the torque control method of the commercial vehicle provided by the invention;
fig. 4: a schematic connection diagram of one embodiment of a torque control system for a commercial vehicle is provided.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
Example 1
Referring to fig. 1, a flow chart of a torque control method for a commercial vehicle according to an embodiment of the invention is shown. The torque control method of the embodiment is suitable for commercial vehicles, the commercial vehicles have high requirements on fuel consumption, the fuel consumption of the commercial vehicles can be intelligently reduced by optimizing a whole vehicle controller architecture (VCU), the development period is shortened, and the fuel saving effect and the fuel economy of the whole vehicle are improved. The torque control method comprises steps 101 to 102, wherein the steps are as follows:
step 101: and acquiring a driver intention signal, and acquiring a first torque according to the driver intention signal and the fuel saving strategy.
In this embodiment, the Vehicle Control Unit (VCU) collects driver intention signals (accelerator opening signals, brake signals, gear hard line signals, etc.), calculates initial torque by combining signals of gear, vehicle speed, etc., and completes the fuel saving effect of the vehicle by fuel saving strategy (accelerator stabilizing function, rapid acceleration smoothing function and torque filtering function). The driver intention refers to the operation of the driver, namely the driving intention, and comprises gear shifting and accelerator pedal pressing. As shown in fig. 2, in the VCU torque architecture, a driver initial torque T1 is obtained through a driver intention signal, T1 is obtained through a stable throttle mode determination to obtain T2 (the value of T2 is the driving initial torque or the stable throttle torque), T2 is obtained through a smooth control mode determination to obtain T3 (the value of T3 is the value of T2 or the smooth control torque), and T3 is subjected to torque filtering to obtain a first torque T4.
Optionally, step 101 specifically includes steps 1011 to 1014, each of which specifically includes:
step 1011: and acquiring a driver intention signal, and calculating initial torque according to the driver intention signal.
Optionally, step 1011 is specifically: collecting a driver intention signal, generating a two-dimensional MAP according to an accelerator pedal and a vehicle speed, and detecting an initial torque according to the driver intention signal and the two-dimensional MAP; the driver intention signals comprise an accelerator opening signal, a brake signal, a gear hard wire signal, an engine control starting signal and a vehicle speed signal.
In this embodiment, a two-dimensional MAP composed of an accelerator pedal and a vehicle speed is acquired by acquiring an accelerator opening signal, a brake signal, a gear hard line signal (provided by a transfer controller), an engine control ECU start signal, a vehicle speed signal, and the like, and the corresponding output torque of a power source under the current vehicle speed and the depth of the accelerator pedal is detected according to the driver intention signal and the two-dimensional MAP, so as to obtain an initial torque which is not subjected to fuel saving strategy processing initially.
Step 1012: and calculating the stable accelerator torque according to the initial torque and the stable accelerator strategy.
Optionally, step 1012 is specifically: judging whether the commercial vehicle enters a stable accelerator mode according to the current vehicle speed, the accelerator pedal opening value and the accelerator pedal change rate, if so, setting a current maximum torque value according to the initial torque, setting the stable accelerator torque value to be equal to the current maximum torque value, and if not, setting the stable accelerator torque value to be equal to the initial torque value.
In the embodiment, whether the commercial vehicle enters a stable accelerator mode or not is judged according to the current vehicle speed, the accelerator pedal opening value and the accelerator pedal change rate, and the judgment condition of the stable accelerator mode is that the current vehicle speed is higher than a preset vehicle speed, namely, the vehicle speed is identified to run in a middle-high speed section; the variation range of the accelerator pedal opening value is smaller than the preset range, namely the accelerator pedal opening value is a relatively stable value, for example, the variation range of the accelerator pedal opening value is between 30% and 60%; the change rate of the accelerator pedal is smaller than the preset change rate, namely, no obvious accelerator is stepped on the accelerator pedal, the change rate of the accelerator pedal in a certain time (such as 1 second) is not more than a certain value (such as 3% or other values). If the throttle stabilizing mode is entered and the throttle stabilizing judging condition is met, the current maximum torque value is set according to the initial torque, the value of the throttle stabilizing torque is set to be equal to the current maximum torque value, the torque is limited, for example, the initial torque value is output to be 700nm, and the torque is limited to be 650nm after entering the throttle stabilizing mode. If not, namely, the throttle stabilizing mode is not entered, and the throttle stabilizing judging condition is not satisfied, the value of the throttle stabilizing torque is set to be equal to the value of the initial torque.
Because most working conditions of the commercial vehicle are that the commercial vehicle runs on a high-speed road section, the throttle stabilizing strategy mainly recognizes that a driver needs to maintain relatively stable vehicle speed at a high speed, at the moment, the output of initial torque is limited to a certain extent, so that the torque is smoothly output to avoid violent output, high-power output torque is avoided, fuel is saved, the behavior of the driver is indirectly restrained through a torque algorithm and a software function, the fuel consumption is reduced, the driver does not have the intention of accelerating, the vehicle speed or the throttle needs to be stabilized, and the initial torque is limited to avoid high-power consumption.
Step 1013: and calculating the smooth control torque according to the stable accelerator torque and the smooth control strategy.
Optionally, step 1013 is specifically: and judging whether the commercial vehicle enters a smooth control mode according to the current vehicle speed and the instant fuel consumption, if so, correcting the smooth coefficient of the stable accelerator torque to obtain smooth control torque, and if not, setting the value of the smooth control torque to be equal to the value of the stable accelerator torque.
In this embodiment, whether the commercial vehicle enters a smooth control mode is determined according to the current vehicle speed and the instant fuel consumption, the determination condition of the smooth control mode is that the instant fuel consumption is higher than a preset value and the current vehicle speed is within a preset range value, if yes, the smooth control mode is entered, the smooth control determination condition is met, one or more smooth coefficients of the stable accelerator torque are modified, the smooth control torque is obtained after the modification, if not, the smooth control mode is not entered, the smooth control determination condition is not met, and the value of the smooth control torque is set to be equal to the value of the stable accelerator torque.
When the instantaneous oil consumption of the vehicle reaches a certain threshold value and the vehicle speed meets a certain value, the vehicle outputs torque gently in the working condition of high oil consumption output, and the instantaneous oil consumption is reduced.
Step 1014: the first torque is calculated according to the smoothing control torque and the torque filtering strategy.
Optionally, step 1014 specifically includes: and carrying out low-pass filtering on the smooth control torque to obtain a first torque.
In this embodiment, conventional low-pass filtering is performed on the smooth control torque to obtain the first torque, so that the torque is smoothly output, no abrupt change occurs, and the comfort of the whole vehicle is improved.
Step 102: the first torque is sent to the engine control equipment, so that the engine control equipment obtains the engine torque according to the first torque, the node torque, the cruising torque and the speed limiting torque, and controls the engine according to the engine torque; the node torque is generated by the vehicle body node according to the node function strategy and is sent to the engine control equipment.
Optionally, step 102 specifically includes: and sending the first torque to the engine control equipment so that the engine control equipment synthesizes the first torque, the node torque, the cruising torque and the speed limiting torque, performs torque arbitration processing to obtain the engine torque, converts the engine torque into an oil injection quantity, and controls the engine.
The node torque is generated by a vehicle body node according to a node function strategy and is sent to engine control equipment; the vehicle body node comprises an automatic gearbox controller, a retarder controller, an automobile anti-lock system, a vehicle body stabilizing system, an automobile anti-skid regulating system and an active tracking control system.
In this embodiment, as shown in fig. 3, in the whole vehicle torque architecture, a whole Vehicle Controller (VCU) sends a first torque to an engine control device ECU, each node of a vehicle body sends respective node torques to the ECU, and the engine control device ECU synthesizes the torques of the whole vehicle controller VCU, an automatic transmission controller TCU, a retarder controller RCU, an anti-lock system ABS, a body stabilization system ESC, an anti-skid control system ASR, an active tracking control system ATC, cruising, speed limiting and the like to perform torque arbitration processing, wherein the torque arbitration processing is how the ECU preferentially responds to the torque of a node according to a safety factor or a functional factor when VCU, RCU, ABS, cruise function enters and the like, and thus obtains the engine torque, converts the engine torque into an oil injection amount, and controls the engine.
The node torque is generated by a vehicle body node according to a node function strategy, the self node required output torque is calculated according to the self function strategy (each node calculates the self node torque and is related to the function requirement strategy of each node system), and the self node torque is sent to the ECU, wherein the vehicle body node comprises, but not limited to, an automatic gearbox controller, a retarder controller, an anti-lock system of a vehicle, a vehicle body stabilizing system, an anti-skid regulating system of the vehicle and an active tracking control system. The cruising torque and the speed limiting torque are calculated by the ECU according to the cruising and speed limiting strategies of the commercial vehicle.
In the embodiment, the fuel-saving effect achieved by the torque control method of the commercial vehicle is verified through experiments, the VCU is configured in a 600 horsepower engine of a certain model of the commercial vehicle, the experiments are carried out under the working condition of 80km/h average speed by using the torque control method, the fuel consumption of the unconfigured VCU is 29.38L/100km, the fuel consumption after the VCU is configured is 28.76L/100km, and the comprehensive fuel-saving effect is improved by 2.2%.
A commercial Vehicle Controller (VCU) collects driver intention signals and combines an oil saving strategy to obtain first torque, an engine control device ECU obtains engine torque according to the first torque, node torque, cruising torque and speed limiting torque, engine control is achieved, the VCU does not arbitrate the torque in the process of calculating the engine torque, but the ECU arbitrates the node torque, and an established ECU torque arbitration strategy is maintained. The VCU manages the torque of the driver intention signal, optimizes the architecture of a complete Vehicle Controller (VCU) of the commercial vehicle, shortens the development period of the complete vehicle and reduces the software risk. Meanwhile, the required torque of the driving behavior of the driver is optimized, an oil saving strategy is formulated, and the oil saving effect and the fuel economy of the whole vehicle are improved.
Example two
Accordingly, referring to fig. 4, fig. 4 is a schematic connection diagram of a second embodiment of a torque control system for a commercial vehicle according to the present invention. As shown in fig. 4, the torque control system of the commercial vehicle includes a vehicle controller 401, a node apparatus 402, and an engine control apparatus 403; the whole vehicle controller 401 executes a torque control method of the commercial vehicle; wherein the connection of the devices is as follows: the vehicle controller 401 is connected to the engine control device 403, and the node device 402 is connected to the engine control device 403.
Optionally, the vehicle controller 401 is configured to collect a driver intention signal, obtain a first torque according to the driver intention signal and the fuel saving strategy, and send the first torque to the engine control device;
the node device 402 is configured to generate a node torque according to a node function policy, and send the node torque to the engine control device;
the engine control device 403 is configured to obtain an engine torque based on the first torque, the node torque, the cruise torque, and the speed limit torque, and to control the engine based on the engine torque.
Optionally, the vehicle controller 401 includes an initial torque module 4011, a throttle stabilizing torque module 4012, a smooth control torque module 4013 and a filtering module 4014;
the initial torque module 4011 is used for collecting a driver intention signal and calculating initial torque according to the driver intention signal; the method comprises the following steps: collecting a driver intention signal, generating a two-dimensional MAP according to an accelerator pedal and a vehicle speed, and detecting an initial torque according to the driver intention signal and the two-dimensional MAP; the driver intention signals comprise an accelerator opening signal, a brake signal, a gear hard wire signal, an engine control starting signal and a vehicle speed signal.
The throttle stabilizing torque module 4012 is used for calculating throttle stabilizing torque according to the initial torque and the throttle stabilizing strategy; the method comprises the following steps: judging whether the commercial vehicle enters a stable accelerator mode according to the current vehicle speed, the accelerator pedal opening value and the accelerator pedal change rate, if so, setting a current maximum torque value according to the initial torque, setting the stable accelerator torque value to be equal to the current maximum torque value, and if not, setting the stable accelerator torque value to be equal to the initial torque value.
The smooth control torque module 4013 is used for calculating smooth control torque according to the stable accelerator torque and the smooth control strategy; the method comprises the following steps: and judging whether the commercial vehicle enters a smooth control mode according to the current vehicle speed and the instant fuel consumption, if so, correcting the smooth coefficient of the stable accelerator torque to obtain smooth control torque, and if not, setting the value of the smooth control torque to be equal to the value of the stable accelerator torque.
The filtering module 4014 is configured to calculate a first torque based on the smoothing control torque and the torque filtering strategy. The method comprises the following steps: and carrying out low-pass filtering on the smooth control torque to obtain a first torque.
Through the torque architecture scheme of the torque control system in the embodiment, the whole vehicle controller VCU optimizes the required torque of the driving behavior of the driver in the torque management of the accelerator pedal of the driver, achieves the effect of 2-5% of the fuel-saving economical efficiency of the whole vehicle, avoids disturbing the traditional formed whole vehicle torque architecture, and achieves the aim of increasing the whole vehicle controller, namely fuel saving. The torque architecture has good compatibility, expandability and flexible developability, and the whole vehicle development period and software development risk are greatly shortened.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (5)
1. A torque control method for a commercial vehicle, comprising:
acquiring a driver intention signal, and acquiring a first torque according to the driver intention signal and an oil saving strategy;
the method comprises the steps of collecting a driver intention signal, and obtaining a first torque according to the driver intention signal and an oil saving strategy, wherein the first torque is specifically as follows:
collecting the driver intention signal, and calculating an initial torque according to the driver intention signal;
calculating the stable accelerator torque according to the initial torque and the stable accelerator strategy;
calculating smooth control torque according to the stable accelerator torque and the smooth control strategy;
calculating the first torque according to the smooth control torque and a torque filtering strategy;
the step of collecting the driver intention signal, and calculating initial torque according to the driver intention signal, wherein the initial torque is specifically as follows:
collecting the driver intention signal, generating a two-dimensional MAP according to an accelerator pedal and a vehicle speed, and detecting the initial torque according to the driver intention signal and the two-dimensional MAP; the driver intention signals comprise an accelerator opening signal, a brake signal, a gear hard wire signal, an engine control starting signal and a vehicle speed signal;
and calculating the stable accelerator torque according to the initial torque and the stable accelerator strategy, wherein the stable accelerator torque is specifically as follows:
judging whether the commercial vehicle enters a stable accelerator mode according to the current vehicle speed, the accelerator pedal opening value and the accelerator pedal change rate, if so, setting a current maximum torque value according to the initial torque, setting the stable accelerator torque value to be equal to the current maximum torque value, and if not, setting the stable accelerator torque value to be equal to the initial torque value;
and calculating smooth control torque according to the stable accelerator torque and the smooth control strategy, wherein the smooth control torque is specifically:
judging whether the commercial vehicle enters a smooth control mode according to the current vehicle speed and the instant fuel consumption, if so, correcting the smooth coefficient of the stable accelerator torque to obtain the smooth control torque, and if not, setting the value of the smooth control torque to be equal to the value of the stable accelerator torque; the judging condition of the smooth control mode is that the instantaneous oil consumption is higher than a preset value and the current vehicle speed is in a preset range value;
the first torque is sent to engine control equipment, so that the engine control equipment obtains engine torque according to the first torque, node torque, cruising torque and speed limiting torque, and controls an engine according to the engine torque; the node torque is generated by a vehicle body node according to a node function strategy and is sent to the engine control equipment;
the first torque is sent to engine control equipment, so that the engine control equipment obtains engine torque according to the first torque, node torque, cruising torque and speed limiting torque, and controls an engine according to the engine torque; the node torque is generated by a vehicle body node according to a node function strategy and is sent to the engine control equipment; the method comprises the following steps:
the first torque is sent to engine control equipment, so that the engine control equipment synthesizes the first torque, the node torque, the cruising torque and the speed limiting torque, torque arbitration processing is carried out, the engine torque is obtained, the engine torque is converted into an oil injection quantity, and the engine is controlled;
the node torque is generated by a vehicle body node according to a node function strategy and is sent to the engine control equipment; the vehicle body node comprises an automatic gearbox controller, a retarder controller, an automobile anti-lock system, a vehicle body stabilizing system, an automobile anti-skid adjusting system and an active tracking control system.
2. The method for torque control of a commercial vehicle according to claim 1, wherein said calculating said first torque according to said smoothing control torque and torque filtering strategy is specifically:
and carrying out low-pass filtering on the smooth control torque to obtain the first torque.
3. A torque control system for a commercial vehicle, comprising: the system comprises a whole vehicle controller, node equipment and engine control equipment; wherein the vehicle controller performs the torque control method of the commercial vehicle according to any one of claims 1 to 2;
wherein the connection of the devices is as follows: the whole vehicle controller is connected with the engine control equipment, and the node equipment is connected with the engine control equipment.
4. The torque control system for a commercial vehicle as defined in claim 3,
the vehicle controller is used for acquiring a driver intention signal, acquiring a first torque according to the driver intention signal and an oil saving strategy, and transmitting the first torque to the engine control equipment;
the node equipment is used for generating node torque according to a node function strategy and sending the node torque to the engine control equipment;
the engine control device is used for obtaining engine torque according to the first torque, the node torque, the cruising torque and the speed limiting torque, and controlling the engine according to the engine torque.
5. The torque control system of the commercial vehicle of claim 4, wherein the vehicle controller comprises an initial torque module, a throttle stabilizing torque module, a smoothing control torque module, and a filtering module;
the initial torque module is used for collecting the driver intention signals and calculating initial torque according to the driver intention signals;
the accelerator stabilizing torque module is used for calculating accelerator stabilizing torque according to the initial torque and the accelerator stabilizing strategy;
the smooth control torque module is used for calculating smooth control torque according to the stable accelerator torque and the smooth control strategy;
the filtering module is used for calculating the first torque according to the smooth control torque and the torque filtering strategy.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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