Vehicle Torque Control Based on Ignition Elapsed Time
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Solution Overview
Problem
Existing torque suppression control systems in vehicles often reduce engine torque unnecessarily, impairing drivability by not distinguishing between intended and unintended acceleration operations, particularly when the driver suddenly accelerates from a stopped position.
Innovation Solution
A control device and method that adjust the torque suppression control mode based on the elapsed time since the ignition switch was turned on, reducing torque reduction when the vehicle is likely in a parking lot and allowing more aggressive acceleration when on the road, thereby aligning control conditions with the driver's intentions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If torque suppression control is executed when accelerator operation is large, then fuel economy is improved, but drivability deteriorates when driver intends to suddenly accelerate
Solution Approach 1:
The control mode of torque suppression control is dynamically changed based on the elapsed time from ignition switch on. The control device switches between first control mode (for parking lot scenario with strong torque reduction) and second control mode (for road scenario with weak torque reduction), allowing the system to adapt to different driving contexts and driver intentions over time
Solution Approach 2:
The invention changes the control parameter (torque reduction amount) based on the elapsed time parameter. By using elapsed time as a criterion, the system adjusts the degree of torque suppression to differentiate between parking lot conditions (short elapsed time) and road conditions (long elapsed time), thereby resolving the contradiction between fuel economy and drivability
2Loss of energy
If torque is significantly reduced through torque suppression control, then fuel consumption is decreased, but acceleration response deteriorates
Solution Approach 1:
The torque reduction amount is dynamically adjusted based on elapsed time. In the first control mode (parking lot), significant torque reduction is applied to save fuel. In the second control mode (road), torque reduction is weakened to preserve acceleration response, thus resolving the contradiction between fuel consumption and acceleration response
Solution Approach 2:
The system changes the torque reduction parameter based on the elapsed time parameter. By setting different torque reduction levels according to whether the vehicle is in parking lot mode or road mode, the system achieves both fuel economy improvement and acceptable acceleration performance
Data Source
AI summary
An electronic control unit executes torque suppression control for reducing engine torque at the time of strong accelerator operation on the basis of an execution condition that a period of time elapsed from when an ignition switch is turned on is shorter than a prescribed period of time. By so doing, the torque suppression control is executed only when the elapsed period of time is short, a vehicle is still running in a parking lot and it is less likely that a driver performs accelerator operation with the intention to suddenly accelerate the vehicle; whereas, when the elapsed period of time is longer than a certain period of time and the vehicle is presumably running on an ordinary road, the torque suppression control is not executed, and acceleration of the vehicle along with the driver's intention is allowed.