Vehicle Start Drive Force Control for Brake Noise and Smooth Acceleration
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Solution Overview
Problem
Existing vehicle control methods that reduce start-time drive force to prevent brake noise compromise acceleration performance, resulting in deteriorated start-time acceleration.
Innovation Solution
A vehicle control method that limits the drive force generated before starting to a predetermined maximum drive force, even without braking, using a microcomputer-controlled system that adjusts oil pressure in the brake device and manages drive force to improve acceleration performance while minimizing start-time shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If drive force is reduced to prevent brake noise, then brake noise is suppressed, but acceleration performance deteriorates
Solution Approach 1:
The patent applies dynamics by making the drive force control strategy adaptive based on vehicle conditions. The system dynamically switches between two modes: (1) limiting drive force to prevent brake noise when the vehicle is stopped with brake application, and (2) allowing full drive force when the vehicle is stopped without brake application. This dynamic adaptation resolves the contradiction by applying different drive force strategies based on the specific operational context, thereby preventing brake noise when necessary while maintaining acceleration performance when possible.
Solution Approach 2:
The patent changes the drive force parameter based on detected vehicle conditions. When a drive request is detected during stoppage with brake application, the system changes the drive force parameter from the requested value to a limited value (less than requested). When stopped without brake application, the system maintains the drive force at the requested value. This parameter change strategy resolves the technical contradiction by adjusting drive force according to the presence or absence of brake application, thus preventing brake noise only when necessary while preserving acceleration performance in other scenarios.
2Object-affected harmful factors
If drive force is limited before vehicle start, then brake noise is prevented, but start-time acceleration performance deteriorates
Solution Approach 1:
The system dynamically adjusts drive force limitation based on brake application status detected at the time of drive request. When the vehicle is stopped with brake application, the system applies drive force limitation to prevent brake noise. When the vehicle is stopped without brake application, the system does not limit drive force, thereby maintaining acceleration performance. This dynamic decision-making process resolves the contradiction by applying limitation only when brake noise would occur.
Solution Approach 2:
The system uses feedback from brake application detection to control drive force output. The control apparatus detects whether brake application is present when a drive request occurs during vehicle stoppage, and based on this feedback information, decides whether to limit drive force. This feedback mechanism resolves the contradiction by using real-time brake status information to make appropriate drive force control decisions, preventing brake noise when brakes are applied while maintaining acceleration performance when brakes are not applied.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances acceleration performance at vehicle start-up by controlling drive force and brake force, reducing the likelihood of start-time shocks and maintaining smooth acceleration without sacrificing acceleration intent.
Implementation Method 1
a brake device 2 that operates according to a brake operation by a driver and a brake keeping device that keeps the operation of the brake device 2 even if the driver stops the brake operation and releases the operation of the brake device 2 when the driver conducts a start operation
Data Source
AI summary
At the time of starting a vehicle, if the vehicle is stopped even without an operation of braking the vehicle, a drive force to be generated before an actual start of the vehicle is limited to or below a predetermined maximum drive force.