Brake Control Device Switching Characteristics During Automatic Braking
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Solution Overview
Problem
The existing brake control devices cause driver discomfort when the brake pedal is operated during automatic braking due to a sudden increase in braking force.
Innovation Solution
A brake control device that switches from a normal brake characteristic to an automatic brake characteristic with a smaller braking command value when the brake pedal is operated during automatic braking, adding the automatic brake characteristic to the automatic-brake braking command value to control the electric actuator and output a braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the brake pedal is operated during automatic brake with normal brake characteristic, then the braking force increases rapidly, but the driver feels a sense of discomfort
Solution Approach 1:
The patent changes the brake characteristic parameter from normal brake characteristic to automatic brake characteristic when the brake pedal is operated during automatic braking. This parameter change modifies the relationship between brake pedal operation amount and braking command value, resulting in a smaller braking command value increase that prevents sudden braking force application and driver discomfort.
2Device complexity
If the braking command value for automatic brake is compared with braking command value for brake pedal operation and the larger one is applied, then the braking control is simplified, but the braking force may increase suddenly causing driver discomfort
Solution Approach 1:
Instead of simply comparing and selecting the larger braking command value, the patent changes the characteristic parameter to use automatic brake characteristic when the brake pedal is operated during automatic brake. This modifies the braking command value calculation to account for the existing automatic brake force, preventing sudden increases while maintaining reasonable control logic.
Data Source
AI summary
A brake control device capable of suppressing a sense of discomfort felt by a driver. The brake control device (31) includes a braking command addition part (34A) for adding an automatic-brake braking command value (B) output from an automatic-brake braking command calculation part (32) and a pedal operation braking command value (A) output from a pedal operation braking command calculation part (34B). The pedal operation braking command calculation part includes a pedal operation braking command selection part (34B1), a normal brake characteristic part (34B2) for holding a normal brake characteristic, and an automatic brake characteristic part (34B3) for holding an automatic brake characteristic. The pedal operation braking command selection part selects a braking command value output from the automatic brake characteristic part when the automatic-brake braking command value is more than 0, and outputs the selection result to the braking command addition part as the pedal operation braking command value.