Braking Force Generator Conditional Stop Logic
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Solution Overview
Problem
The existing braking force generators experience temporary reduction in reaction force when starting a vehicle, leading to uncomfortable braking force variations due to premature activation and potential shutdown issues, especially when the ignition switch ON signal is not transmitted correctly.
Innovation Solution
A braking force generator with a hydraulic pressure generation unit that activates based on the ignition switch and door operations, featuring a conditional stop unit that maintains operation if the ignition switch ON signal is not received, preventing shutdown and ensuring consistent braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the braking force generator is started by the opening and closing operation of the door, then the braking force generator can be activated before the IG switch is turned on, but the braking force generator may remain in an operation state unnecessarily if the IG switch is not turned on, leading to unreasonable operation
Solution Approach 1:
The ECU continuously monitors whether the IG switch has been turned on within the predetermined time period after door start. Based on this feedback information, the ECU determines whether to maintain or terminate the operation state of the braking force generator, ensuring reasonable operation control.
2Reliability
If the braking force generator shuts down itself after the time limit when the ON signal is not transmitted, then the system stops operation, but the braking force varies at the timing of shutdown causing driver discomfort
Solution Approach 1:
The ECU determines whether the IG switch has been turned on within the predetermined time period before shutting down the braking force generator. This prior determination prevents abrupt shutdown and ensures continuous braking force generation, cushioning against the potential discomfort caused by sudden braking force changes.
3Measurement precision
If the ON signal transmission is monitored strictly, then the system can detect signal line disconnection, but the braking force generator may shut down incorrectly when the ON signal is delayed or lost
Solution Approach 1:
The ECU starts a predetermined time period timer when door start is detected, providing a time window for the IG switch to be turned on. This preliminary time allowance prevents incorrect shutdown decisions due to signal transmission delays, while still enabling detection of genuine signal line disconnections if the IG switch is not turned on within the specified period.
Data Source
AI summary
The object of the present invention is to provide a braking force generator capable of preventing a braking force from varying, even if an ON signal of an IG switch is not transmitted. The braking force generator includes a hydraulic pressure generation unit that becomes in an operation state according to an ON state of the IG switch of a vehicle or an opening and closing operation of an opening and closing member of the vehicle and generates a braking force according to an electrical signal based on an operation amount of a driver, and a conditional stop unit that puts the hydraulic pressure generation unit in an operation stop state if an OFF state of the IG switch continues for a predetermined time after the hydraulic pressure generation unit becomes in the operation state according to the opening and closing operation of the opening and closing member.