Vehicle Drive Control Apparatus Acceleration Suppression
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Solution Overview
Problem
When a driver hastily turns the accelerator on before switching the shift position from the non-driving to the driving position, it can cause discomfort due to unexpected vehicle behavior, as the drive force transmission to the wheels occurs before the intended start, leading to unusual acceleration.
Innovation Solution
A vehicle drive control apparatus with a controller that performs drive force suppression processing to limit acceleration when the shift position is switched from non-driving to driving with the accelerator on, incorporating a predetermined delay before reducing drive force output, and adjusting the upper limit of acceleration based on vehicle speed and transmission speed ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If drive force is transmitted immediately when shift position is switched to driving position with accelerator ON, then vehicle responsiveness is improved, but driver comfort deteriorates due to sudden excessive acceleration
Solution Approach 1:
The controller detects when the accelerator is turned ON before the shift position is switched to the driving position, and proactively suppresses the drive force output when the shift position is subsequently switched. This preliminary detection and counter-action prevents the harmful effect of sudden excessive acceleration before it occurs, resolving the contradiction between responsiveness and driver comfort.
Solution Approach 2:
The controller dynamically adjusts the drive force output based on the operational state. When the accelerator is turned ON prior to shifting, the controller modifies the drive force suppression characteristics compared to normal operation, creating a dynamic response that balances responsiveness with comfort by adapting to the specific operational context.
2Ease of operation
If drive force suppression processing is performed to limit acceleration, then driver comfort is improved, but vehicle productivity deteriorates due to reduced drive force output
Solution Approach 1:
The controller applies partial drive force suppression rather than complete suppression. By controlling the drive force so that acceleration does not exceed an upper limit rather than eliminating drive force entirely, the system maintains sufficient vehicle starting performance while still preventing excessive acceleration that would cause driver discomfort.
Solution Approach 2:
The controller changes the acceleration parameter by imposing an upper limit on acceleration during the drive force suppression processing. This parameter modification allows the vehicle to still accelerate and start effectively while keeping the acceleration within comfortable bounds for the driver, thus resolving the contradiction between comfort and productivity.
Data Source
AI summary
Provided is a vehicle drive control apparatus including a shift mechanism configured to be able to selectively switch its shift position to either a driving position or a non-driving position; and a controller configured to control the drive force output from a motor serving as a drive source of the vehicle according to operation of an accelerator, to transmit the drive force from the motor to wheels when the shift position is in the driving position, and to stop the transmission of the drive force from the motor to the wheels when the shift position is in the non-driving position. The controller also performs drive force suppression processing to control the drive force, when the shift position is switched from the non-driving position to the driving position with the accelerator turned ON, such that the acceleration of the vehicle does not exceed an upper limit of acceleration.