Vehicle Drive Torque Control for Rough Road Slip Suppression
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Solution Overview
Problem
Existing drive control systems for vehicles struggle to accurately suppress slipping on rough road surfaces, often leading to excessive reduction of drive torque due to exaggerated slipping detection, and face challenges in tracking road surface conditions effectively.
Innovation Solution
A drive control apparatus that determines the road surface state and adjusts the drive torque by prioritizing motor torque correction over brake torque correction, using a road surface determining unit, slip suppressing unit, and correction amount adjusting unit to ensure appropriate slip suppression based on the road surface conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive torque is reduced to suppress slipping detection, then the slipping suppression effect is improved, but the drive performance deteriorates due to excessive torque reduction on rough roads
Solution Approach 1:
The system changes the control parameters (torque correction amount) based on the detected road surface state. When rough road is detected, the torque correction amount is reduced compared to smooth road conditions, allowing effective slip suppression while maintaining drive performance on rough surfaces.
Solution Approach 2:
The control system dynamically adjusts the torque correction strategy based on real-time road surface conditions. The ECU continuously monitors wheel speed, vehicle speed, and acceleration to detect rough road states and adapts the torque reduction amount accordingly, transitioning between different control modes.
2Speed
If the motor torque is corrected with high priority, then the responsiveness of drive torque correction is improved, but the system complexity increases
Solution Approach 1:
The control system segments the torque correction function into two parts: the ECU handles detection and decision-making, while the motor controller executes the torque adjustment. This segmentation allows responsive torque correction while distributing system complexity across different control components.
Data Source
AI summary
A drive control apparatus is applied to a drive system that is mounted to a vehicle, drives wheels of the vehicle by a motor, and brakes the wheels by a brake apparatus. The drive control apparatus determines a road-surface state of a travel road of the vehicle. The drive control apparatus suppresses slipping of the vehicle by correcting a drive torque by correcting at least either of a motor torque and a brake torque. When determined that the drive torque is to be corrected, the drive control apparatus adjusts a correction amount of the drive torque by adjusting the motor torque with higher priority than the brake torque in response to be determined that the road-surface state is rough.