Brake Control Apparatus Pseudo Mode for Actuator Failure
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Solution Overview
Problem
Existing brake control systems for vehicles face safety degradation when antilock control using the brake actuator is unavailable, limiting the opportunity and duration for executing antilock control.
Innovation Solution
A brake control apparatus that includes a master cylinder, a master pressure changing device, and a control unit capable of executing antilock control in a pseudo mode by reducing brake pressure of target wheels independently of the brake pedal operation, even when the normal mode using the brake actuator is unavailable, by operating the master pressure changing device to achieve target brake pressure values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antilock control is executed using the brake actuator (normal mode), then the brake pressure of the target wheel can be precisely controlled, but the system becomes unavailable when the brake actuator fails
Solution Approach 1:
The patent changes the control parameter from individual wheel brake pressure (via brake actuator) to master cylinder pressure (via master pressure changing device). This alternative control path allows antilock control to be executed even when the brake actuator is unavailable, improving system reliability through parameter substitution.
Solution Approach 2:
The master pressure changing device acts as an intermediary component that can independently control master pressure without requiring the brake actuator. This intermediary control mechanism provides a backup path for antilock control execution, resolving the contradiction between reliability and device complexity dependence.
2Duration of action of moving object
If the brake actuator is used for antilock control, then individual wheel brake pressure control is achieved, but the control opportunity and duration are limited when the brake actuator is unavailable
Solution Approach 1:
The patent implements a dynamic control mode switching mechanism that transitions between normal mode (brake actuator control) and pseudo mode (master pressure changing device control) based on system availability. This dynamic adaptation extends the duration of antilock control execution by providing an alternative operational path when the primary system becomes unavailable.
3Reliability
If the master pressure changing device is used for antilock control (pseudo mode), then the antilock control can be executed when the brake actuator is unavailable, but the individual wheel pressure control capability is reduced
Solution Approach 1:
The patent segments the antilock control system into two independent control paths: normal mode using the brake actuator for individual wheel control, and pseudo mode using the master pressure changing device for backup control. This segmentation allows each subsystem to operate independently, providing reliability through redundancy while maintaining the option for precise individual wheel control when available.
Data Source
AI summary
A brake control apparatus includes: a master cylinder that outputs a brake fluid at a master pressure; a master pressure changing device that can change the master pressure irrespective of an operation of a brake pedal; a brake actuator; and a control unit that executes antilock control by reducing a brake pressure of a target wheel. Modes of the antilock control include a normal mode and a pseudo mode. In the pseudo mode, the control unit operates the master pressure changing device such that the master pressure obtains a target value of the brake pressure of the target wheel, and changes the brake pressure of the target wheel in an interlocking manner with the master pressure. When the normal mode is unavailable, the control unit executes the antilock control in the pseudo mode.