Electric Brake Compensation Control for Vehicle Stability Failures
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Solution Overview
Problem
Existing vehicle control systems do not adequately address the stability issues caused by unintended braking forces generated due to failures in frictional braking apparatuses.
Innovation Solution
A vehicle control apparatus and method that includes a control unit to manage both primary and secondary frictional braking apparatuses. When a failure occurs in the primary braking apparatus, the control unit outputs a braking instruction to the secondary braking apparatus to generate a braking force equivalent to the failed primary braking apparatus, thereby maintaining vehicle stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a braking force control apparatus only addresses electric motor failures without considering frictional braking apparatus failures, then the control system remains simple, but vehicle behavior stability is compromised when frictional braking failures occur
Solution Approach 1:
The control apparatus pre-establishes a compensation mechanism where the normally idle frictional braking apparatus is prepared to compensate for failures. When a failure is detected in the primary braking apparatus, the control unit activates the pre-planned compensation strategy by applying braking force through the secondary frictional braking apparatus, thereby maintaining vehicle stability without requiring complex real-time decision-making algorithms.
Solution Approach 2:
The frictional braking apparatus serves as an intermediary compensation mechanism. When the primary braking apparatus (electric motor or service brake) fails, the control unit utilizes the frictional braking apparatus as a mediator to generate compensatory braking forces on opposite wheels, thereby offsetting the unintended braking forces and maintaining vehicle behavior stability.
2Reliability
If no compensation control is implemented when primary braking apparatus fails, then the control system remains simple, but unintended braking forces cause vehicle instability
Solution Approach 1:
The control unit continuously monitors the operational status of the primary braking apparatus and implements feedback control. When a failure is detected, the system receives feedback about the unintended braking force magnitude and activates the compensation mechanism through the frictional braking apparatus, dynamically adjusting the braking force to maintain vehicle stability.
Solution Approach 2:
The system pre-configures the frictional braking apparatus as a standby compensation device. Upon detecting primary braking apparatus failure, the control unit immediately activates the pre-planned compensation strategy, applying braking force through the secondary frictional braking apparatus before vehicle instability can manifest, thereby maintaining stable vehicle behavior.
3Reliability
If the frictional braking apparatus is used for compensation control, then vehicle stability is maintained under failure conditions, but the braking apparatus operates beyond its normal function
Solution Approach 1:
The frictional braking apparatus is designed with multi-functionality, serving both its normal braking function and a compensation function. The control unit enables the frictional braking apparatus to perform dual roles: providing regular braking during normal operation and generating compensatory braking forces when primary braking apparatus failures occur, thereby maintaining vehicle stability without requiring additional dedicated compensation devices.
Data Source
AI summary
A left front electric brake mechanism provides a braking force to a left front wheel of a vehicle. A right front electric brake mechanism provides a braking force to a right front wheel of the vehicle. A left rear electric brake mechanism provides a braking force to a left rear wheel of the vehicle. A right rear electric brake mechanism provides a braking force to a right rear wheel of the vehicle. An ECU controls the electric brake mechanisms. When a first braking force provided to a first wheel (for example, the left front wheel) cannot be controlled due to a failure in a first frictional braking apparatus (for example, the left front electric brake mechanism), the ECU outputs a braking instruction for causing a second frictional braking apparatus to generate a second braking force according to magnitude of the first braking force.