Vehicle Control System Fuel Cut-Off Threshold Adjustment
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Solution Overview
Problem
Vehicle control systems face challenges in reducing unintentional shocks during autonomous mode operation, as the change in driving and braking forces can be sensed by the driver in manual mode but not in autonomous mode, leading to unexpected shocks.
Innovation Solution
A vehicle control system that sets a higher threshold for fuel cut-off control in autonomous mode compared to manual mode, including vehicle speed, engine speed, gear stage, and transmission speed ratio, to terminate fuel cut-off control earlier and reduce shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fuel cut-off control is executed under autonomous mode to establish engine braking force, then fuel efficiency is improved, but shocks are generated during termination of fuel cut-off control
Solution Approach 1:
The patent applies parameter changes by setting different threshold values for fuel cut-off control termination based on the operating mode. Specifically, a first threshold is set for autonomous mode and a second threshold for manual mode, with the first threshold being higher than the second threshold. This causes the fuel cut-off control to be terminated earlier under autonomous mode, reducing the magnitude of shocks generated during termination while still maintaining fuel efficiency benefits.
2Force
If fuel cut-off control is terminated later to maintain engine braking force, then braking effectiveness is improved, but shocks during execution and termination of fuel cut-off control increase
Solution Approach 1:
The patent changes the parameter of threshold values based on operating mode to resolve this contradiction. By setting a higher first threshold for autonomous mode compared to the second threshold for manual mode, the system terminates fuel cut-off control earlier under autonomous mode. This reduces the duration and intensity of engine braking force changes, thereby minimizing shocks during both execution and termination of fuel cut-off control while maintaining adequate braking effectiveness.
3Device complexity
If the same threshold is used for both manual and autonomous modes, then control simplicity is maintained, but unintentional shocks occur during autonomous mode operation
Solution Approach 1:
The patent applies local quality by differentiating the threshold parameter specifically for autonomous mode operation while maintaining a separate threshold for manual mode. The controller is configured to select the first threshold when autonomous mode is detected and the second threshold when manual mode is detected. This localized differentiation ensures that autonomous mode operates with optimized thresholds that prevent unintentional shocks, while manual mode retains its original control characteristics.
Data Source
AI summary
A vehicle control system to reduce shocks under an autonomous mode is provided. The vehicle control system is configured to select an operating mode of a vehicle from a manual mode in which a driving force and a braking force are controlled manually by a driver, and an autonomous mode in which the driving force and the braking force are controlled autonomously. A controller is configured to execute a fuel cut-off control, and a threshold selected under the autonomous mode is set in such a manner as to terminate the fuel cut-off control earlier than under the manual mode.