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A control method for four-wheel drive torque overrun

A technology of torque control and engine torque, applied in the field of control strategy of timely four-wheel drive control system, to achieve the effect of improving service life and reducing cost

Active Publication Date: 2019-07-05
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The main purpose of the present invention is to provide a new four-wheel drive system for the problem that the structure of the torque manager will cause torque overrun under extreme working conditions, and there is no control strategy to suppress the four-wheel drive torque overrun in the current four-wheel drive system. The torque overrun control method requests the engine to limit the torque rise through the four-wheel drive system, which can limit the four-wheel drive torque overrun under extreme conditions, and protect the four-wheel drive components such as PTU from damage caused by the four-wheel drive torque overrun

Method used

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  • A control method for four-wheel drive torque overrun
  • A control method for four-wheel drive torque overrun
  • A control method for four-wheel drive torque overrun

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Embodiment Construction

[0031] The control logic of the present invention is further described below in conjunction with accompanying drawing:

[0032] see image 3 , the four-wheel drive torque overrun control method of the present invention, its control logic is as follows:

[0033] 1. Set the engine torque limit control parameter AWDEngineTorqLimitEnable requested by the four-wheel drive system and the engine torque request value AWDEngineTorqReq. The initial default value of the engine torque limit control parameter AWDEngineTorqLimitEnable is 0, and the initial default value of the engine torque request value AWDEngineTorqReq is the maximum engine torque value.

[0034] 2. The ECU of the four-wheel drive system obtains the front and rear four wheel speeds and engine torque from the CAN network of the vehicle, calculates the clutch input and output speeds of the torque manager and the difference δ between the clutch input and output speeds, and calculates the engine output torque through the tran...

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Abstract

The invention provides a control method for four-wheel drive torque ultra-limit. An engine is requested to prevent torque increase via a four-wheel drive system; a control strategy is started and thefour-wheel drive ultra-limit is prevented under an extreme work condition, where the engine torque exceeds a preset value and a speed difference between front and back wheels exceeds a preset value; service life of four-wheel drive parts and components such as a power takeoff unit (PTU) can be prolonged when designing strength is not improved, so cost can be reduced; and negative effects to powerperformance and driving performance of the whole wheel can be prevented.

Description

technical field [0001] The invention relates to a control strategy of a timely four-wheel drive control system based on front-wheel drive and using a torque manager, in particular to a control method for controlling the output torque of the torque manager not to exceed a set torque upper limit. Background technique [0002] A four-wheel drive vehicle based on front-wheel drive, its four-wheel drive system is mainly composed of PTU, intermediate drive shaft, torque manager, rear axle final drive, rear drive shaft and other components, see figure 1 . [0003] PTU, also known as a power take-off, is connected to the transmission, and converts the horizontally transmitted drive force from the main drive shaft to longitudinal transmission, and then transmits it to the rear axle main reducer of the auxiliary drive shaft through the intermediate drive shaft, and then through the rear axle main reducer The transmission and its differential are converted to lateral transmission, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W30/188B60W50/00B60W10/06
CPCB60W10/06B60W30/1882B60W50/00B60W2050/0082B60W2510/0657B60W2520/28B60W2710/0666
Inventor 吴沄蒋平胡显力张晓龙苏强陈瑞
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD