Brake Pedal Speed Control via Duration Mapping
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Solution Overview
Problem
Conventional vehicle stop holding systems require frequent and complex operations between the brake and accelerator pedals to control vehicle speed after starting, especially in low-speed traffic situations, leading to driver operational burden due to inability to specify vehicle speed change rate through brake pedal operation.
Innovation Solution
A driving support system incorporating a braking device, vehicle speed change rate setting device, and vehicle speed control device that allows drivers to set and control target vehicle speed change rates via simple brake pedal operations, including acceleration, constant-speed running, and deceleration, with optional forward condition confirmation for safe vehicle speed adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vehicle stop holding control is canceled by depressing the brake pedal, then the held braking force state is canceled, but the driver cannot specify the change rate of vehicle speed after start
Solution Approach 1:
The system changes the functional parameter of the brake pedal from simple braking control to include vehicle speed change rate specification. By detecting the duration of brake pedal depression, the system maps different depression durations to different target vehicle speed change rates, enabling the driver to specify acceleration characteristics using the same brake pedal operation.
Solution Approach 2:
The brake pedal is given multiple functions: it serves both as a braking control device and as a vehicle speed change rate setting device. This multi-functionality eliminates the need for separate controls and reduces operational complexity while maintaining adaptability.
2Ease of operation
If the driver uses creeping start with automatic transmission, then the vehicle can start without accelerator operation, but frequent pedal changes between brake and accelerator are required in traffic situations
Solution Approach 1:
The brake pedal is given multiple functions: it serves both as a braking control device and as a vehicle speed change rate setting device. This multi-functionality eliminates the need for separate controls and reduces operational complexity while maintaining adaptability.
Solution Approach 2:
The system merges the functions of brake pedal operation and vehicle speed control into a single operational interface. By combining the braking function with the vehicle speed change rate specification function, the system reduces the number of pedal changes required while maintaining responsive vehicle control.
3Reliability
If braking force control is used to hold stopped state, then the vehicle can be held stationary, but the driver must perform complex pedal changes to control vehicle speed after start
Solution Approach 1:
The brake pedal is given multiple functions: it serves both as a braking control device and as a vehicle speed change rate setting device. This multi-functionality eliminates the need for separate controls and reduces operational complexity while maintaining adaptability.
Data Source
AI summary
An electronic control unit is provided with a braking device formed of a brake pedal which exerts braking force on a vehicle, a brake actuator, braking units and the like, a vehicle speed change rate setting device which sets a target vehicle speed change rate, and a vehicle speed control device which performs vehicle speed control to realize the target vehicle speed change rate by predetermined operation to the braking device performed by a driver. The vehicle speed change rate setting device sets a target vehicle speed change rate to accelerate the vehicle when the predetermined operation is performed while the vehicle stops, for example.