A method for anti-slip control of transfer case

A control method and transfer case technology, applied in the field of anti-skid control, can solve problems such as unfavorable vehicle drivability and stability, transfer case engaging torque fluctuation, longitudinal acceleration fluctuation, etc., so as to avoid transfer case engaging torque fluctuation, The effect of reducing the slip state and avoiding the slip

Active Publication Date: 2022-04-12
CHINA FIRST AUTOMOBILE
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Problems solved by technology

However, when the vehicle accelerates on a slippery road, frequent and repeated transfer case engagement torque fluctuations, anti-skid fluctuations, and longitudinal acceleration fluctuations are likely to occur, resulting in frequent and repeated changes in the judgment relationship between the speed difference and the threshold value, which is not conducive to Drivability and stability of the vehicle

Method used

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  • A method for anti-slip control of transfer case
  • A method for anti-slip control of transfer case
  • A method for anti-slip control of transfer case

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[0045] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0046] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features. Throughout the specification, like reference numerals refer to like elements.

[0047] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0048] In this embodiment, a transfer case anti-slip control method is proposed, which comprehens...

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Abstract

The invention discloses an anti-slip control method of a transfer case, which belongs to the technical field of anti-slip control. The transfer case anti-slip control method includes the following steps: S10: Calculation of the target speed of the main drive shaft: v m，target =max(v s，target , v min ); S20: Determine the condition of anti-skid control: when v m > v m，target (1+λ 1 ) and v m >v m，target (1+λ 1 ) hold time t≥t 1 , to start the anti-skid control; when the anti-skid control is started: when the transfer case of the vehicle is engaged, the control torque T target = 0 and T target =0 hold time t≥t 2 , the anti-skid control is exited; S30: engagement control torque T of the transfer case target Calculation: T target =k p Δ v，m +k I ∫Δ v，m , k p and k I is obtained by modifying the control parameter factor b of the vehicle in the over-slip state and under-slip state, Δ v，m Speed ​​control deviation of the main drive shaft Δ v，m =v m ‑v m，target , so that after the vehicle starts the anti-skid control, it can follow the T target =k p Δ v，m +k I ∫Δ v，m Calculated T target The value adjusts the engagement control torque of the transfer case. This has the advantage of being able to adjust the engagement control torque of the transfer case while avoiding the effects of slip fluctuations and torque fluctuations.

Description

technical field [0001] The invention relates to the technical field of anti-slip control, in particular to an anti-slip control method for a transfer case. Background technique [0002] In slipping conditions, when the main drive wheels of a vehicle equipped with a timely four-wheel drive transfer case slip, it is necessary to implement anti-skid control on the transfer case; Re-realize the reasonable distribution of driving torque between the front axle and rear axle of the vehicle, thereby eliminating the over-slip or under-slip state of the main drive wheel, so as to improve the traction and stability of the vehicle. [0003] At present, the anti-skid control for the four-wheel drive transfer case is mainly based on the threshold value control, that is, the anti-skid control coefficient and the specific transfer case are determined according to the speed difference between the front axle and the rear axle of the vehicle. When the speed difference is greater than the pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W10/30B60W30/02B60W40/00
CPCB60W10/30B60W30/02B60W40/00
Inventor 王德平崔金龙刘元治周泽慧吴爱彬屠有余赵洋孙起春
Owner CHINA FIRST AUTOMOBILE
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