Steering Brake and ASR Control for Tight Vehicle Cornering
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Solution Overview
Problem
Existing vehicle control systems with traction control and steering brake functions face challenges in maximizing the steering effect while minimizing the increase in curve radius and avoiding wear-promoting braking interventions, especially when the steering brake function is active.
Innovation Solution
A method for operating a vehicle control system that includes a drive motor, differential gear, and braking device, where the traction control system intervenes in the drive control to reduce traction slip without activating the brake control when the steering brake function is active, allowing for enhanced steering effect and reduced wear on the drivetrain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the traction control system brakes the drive wheel on the outside of the curve to reduce traction slip, then the permissible traction slip is maintained, but the steering effect is reduced and the curve radius increases
Solution Approach 1:
The system dynamically switches between two operational modes: normal traction control mode (with brake intervention) and steering brake active mode (without brake intervention). This dynamic adaptation allows the system to optimize performance based on current driving conditions, specifically whether steering brake function is active, thereby resolving the contradiction between maintaining traction slip control and preserving steering effect
Solution Approach 2:
The control system changes the intervention parameter (brake activation) based on the operational state. When steering brake function is detected as active, the system disables brake intervention in the traction control system, effectively changing the control parameter from 'brake active' to 'brake inactive' to prevent interference with the steering brake function
2Reliability
If the brake control is activated to reduce traction slip, then the permissible traction slip is maintained, but wear-promoting braking interventions occur
Solution Approach 1:
The system changes the brake intervention parameter from active to inactive when steering brake function is detected, thereby eliminating unnecessary brake wear while maintaining traction control through drive power reduction alone in this specific operational context
3Ease of operation
If the drive wheel on the outside of the curve is not braked during steering brake function, then the steering effect is maximized, but the drive slip becomes unacceptably high
Solution Approach 1:
The invention extracts the brake intervention function from the traction control system specifically when steering brake function is active. By removing the brake control component from the traction control response in this scenario, the system allows the steering brake function to operate without interference while managing drive slip through alternative means (drive power reduction)
Solution Approach 2:
The system changes the control strategy parameter from 'brake intervention enabled' to 'brake intervention disabled' when steering brake function is active, thereby allowing higher drive slip temporarily while preserving the steering effect, and compensates by reducing drive power
Data Source
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AI summary
The invention relates to a method for operating a control system (300) of a vehicle, which comprises at least the following: A brake device (1), which is controlled by a brake controller (14), with a first brake actuator (50a) for the first drive wheel (98a) and a second brake actuator (50b) for the second drive wheel (98b), a steering brake function with which, by targeted activation of the first brake actuator (50a) and/or of the second brake actuator (50b) of the at least one driven axle (HA), a steering effect on the vehicle can be achieved, a traction control system (ASR) with which an impermissible drive slip at the first drive wheel (98a) and/or at the second drive wheel (98b) of the at least one driven axle (HA) is reduced by intervention in a drive controller (93) of the drive motor (94) and/or by intervention in the brake controller (14) of the brake device (1). The invention makes provision that, if the steering brake function at the at least one driven axle (HA) is active or has been activated, and if then the traction control system (ASR) at the at least one driven axle (HA) is activated, intervention in the brake controller (14) of the brake device (1) is omitted within the scope of the traction control system (ASR).