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Torque control method of automobile four-drive system

A torque control and automotive technology, applied in the automotive field, can solve the problems of high fuel consumption and poor economy, and achieve the effects of ensuring power, improving fuel economy and riding comfort.

Active Publication Date: 2012-12-19
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This driving mode has better off-road and handling performance, but it cannot adjust the torque distribution according to the road conditions, the fuel consumption is too high, and the economy is poor

Method used

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  • Torque control method of automobile four-drive system
  • Torque control method of automobile four-drive system
  • Torque control method of automobile four-drive system

Examples

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Embodiment Construction

[0027] The intelligent torque electronic controller used in the present invention needs to cooperate with vehicle sensors, CAN bus, electromagnetic clutch, ABS (anti-lock braking system) / ESP (body electronic stability system), etc. to realize the time-sharing conversion of two-wheel drive / four-wheel drive. For the system block diagram and structural block diagram, see figure 1 , figure 2 .

[0028] The intelligent torque electronic controller is an electronic control unit that uses existing body sensors to receive signals such as accelerator pedal opening, steering angle, wheel speed, engine status, engine speed, and ABS / ESP activation through the CAN bus to determine the driving status of the vehicle , calculate the torque that needs to be transmitted to the rear wheels through the control strategy, and send the distribution torque, system type and other signals to the vehicle network through the CAN bus, and at the same time, the clutch solenoid valve drive module outputs ...

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Abstract

The invention discloses a torque control method of an automobile four-drive system. The method comprises the following steps of: collecting wheel speed of a vehicle, opening degree of an accelerator pedal, the state of an engine, the rotating speed of the engine, a steering angle and an ABS / ESP (Anti-lock Brake System / Electronic Stability Program) activating signal in real time by an intelligent torque electronic controller, then determining a torque discreet value of a current work condition by an MAP table of the vehicle speed and an accelerator pedal position signal to the torque distribution requirement and an MAP table of the vehicle speed and a front and rear axle wheel speed difference signal to the torque distribution requirement; and determining a two-drive / four-drive mode by comparison of estimated torque and a switch threshold so as to obtain target torque, and finally, controlling torque of front and rear axles by an intelligent manager according to an I-T characteristic curve. According to the invention, the driving state of the vehicle can be automatically identified by the intelligent torque electronic controller; the drive mode is automatically switched; a torque distribution scheme is automatically adjusted; and the fuel economy and riding comfort of the vehicle are greatly improved when the dynamic property and throughput capacity of the vehicle are ensured.

Description

technical field [0001] The invention relates to a method for automatically switching driving modes according to the driving state of a vehicle, which belongs to the technical field of automobiles. Background technique [0002] At present, there are two main driving modes of automobile four-wheel drive system: time-sharing four-wheel drive and full-time four-wheel drive. Part-time four-wheel drive is a mode in which the driver selects two-wheel drive or four-wheel drive by manually connecting or disconnecting the transfer case according to specific road conditions. The disadvantage is that its four-wheel drive only locks the front and rear wheels together, and cannot reasonably distribute the torque, and requires the driver to judge the road conditions by himself and manually switch the driving mode. The operation is cumbersome and it is difficult to switch in a timely manner. Full-time four-wheel drive is a mode in which the vehicle maintains four-wheel drive throughout the...

Claims

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Application Information

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IPC IPC(8): B60W30/18
Inventor 李琦李雷张南卢娜刘咏涛王广牛海超
Owner GREAT WALL MOTOR CO LTD
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