Electric Brake Actuator Controller State Management
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Solution Overview
Problem
Conventional electric brake systems face issues where unintended braking forces can be applied if the system restarts during recovery from a partial actuation state, particularly when the vehicle is running, leading to unintended braking actions.
Innovation Solution
The electric brake apparatus includes an actuator controller that maintains the interrupted state until a new actuation request signal is issued, ensuring control is resumed according to the driver's intention upon system recovery, by detecting the uncompleted control state and restarting operations based on new signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control system restarts uncompleted parking brake control after system recovery, then the control can be completed, but unintended braking force may be applied when the vehicle is running
Solution Approach 1:
The actuator controller checks the vehicle running state before restarting uncompleted control. This preliminary check prevents unintended braking by determining whether restart is safe, thus resolving the contradiction between completing control and avoiding harmful effects
Solution Approach 2:
The controller continuously monitors vehicle running state and uses this feedback to decide whether to restart control. This feedback mechanism ensures control is only restarted when safe, preventing unintended braking while maintaining control completion
2Ease of operation
If the system maintains interrupted state until new actuation request, then driver's intention is respected, but control completion is delayed
Solution Approach 1:
The control system dynamically adjusts its behavior based on incoming actuation requests. When a new request is received, the controller evaluates whether to restart uncompleted control or wait, creating a flexible response that balances driver intention with control efficiency
Solution Approach 2:
The controller prepares to restart control only when a new actuation request is received, rather than immediately upon system recovery. This preliminary waiting ensures driver intention is respected while minimizing unnecessary delays
Data Source
AI summary
An electric brake apparatus includes an electric actuator configured to actuate a brake mechanism according to an actuation request signal, and an actuator controller configured to control an operation of the electric actuator with use of a power source mounted at a vehicle to perform control of holding and a release of braking by the brake mechanism. When a system recovers and the actuator controller detects that the control of the holding or the release has been interrupted with an uncompleted control state since system down occurred in the middle of the control of the holding or the release of the braking by the brake mechanism, the actuator controller maintains the interrupted state until a new actuation request signal is issued, and controls the operation of the electric actuator according to the content of the new actuation request signal.