Vehicular Engine Control Device with Dynamic Stop Conditions
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Solution Overview
Problem
Existing vehicular engine control systems lack the ability to perform automatic engine stop control in accordance with the driver's intention, particularly when navigating intersections at low speeds or parking, leading to unintended engine stoppage.
Innovation Solution
A vehicular engine control device with a control unit that utilizes vehicle speed and steering information, setting multiple stop conditions based on steering thresholds, allowing the automatic engine stop control to be adjusted according to the vehicle's speed, thereby aligning with the driver's intentions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If automatic engine stop control is implemented without considering steering operation context, then fuel savings and emission reduction are improved, but unintended engine stoppage occurs during low-speed maneuvers such as passing intersections or parking
Solution Approach 1:
The control device changes the stop condition parameters dynamically based on vehicle speed. At lower speeds (e.g., below 10 km/h), the steering angle threshold is set to a higher value to prevent unintended stoppage during intersections or parking maneuvers. At higher speeds, the threshold is lowered to enable more aggressive fuel-saving stop control, thus adapting the control strategy to current driving conditions
Solution Approach 2:
The stop condition is made dynamic rather than static. The control device continuously monitors vehicle speed and adjusts the steering angle threshold accordingly. This dynamic adjustment allows the system to respond to changing driving scenarios, preventing premature engine stop during low-speed maneuvers while maintaining fuel efficiency during normal driving conditions
2Device complexity
If a single fixed steering angle threshold is used for all vehicle speeds, then the control system is simple, but it cannot distinguish between intentional low-speed maneuvers and conditions requiring engine stop
Solution Approach 1:
The control system transitions from a static threshold to a dynamic threshold that varies with vehicle speed. The control device incorporates a speed threshold (e.g., 10 km/h) to determine which steering angle threshold to apply, enabling the system to adapt to different driving scenarios without requiring multiple fixed thresholds or complex decision logic
Solution Approach 2:
The steering angle threshold parameter is changed based on vehicle speed conditions. The control device stores multiple threshold values (first and second steering angle thresholds) and selects the appropriate one based on whether the vehicle speed is below or above the speed threshold, simplifying the control logic while improving adaptability
Data Source
AI summary
A vehicular engine control device provided with a control unit for performing control that automatically stops an engine installed in a vehicle when a preset stop condition is fulfilled, and a traveling information acquiring unit for acquiring travel information including vehicle speed information relating to the speed of the vehicle and steering information relating to a steering wheel. For the stop condition the vehicle speed information and steering information acquired by the traveling information acquiring unit are set including respective thresholds. The control unit switches the stop condition in accordance with changes in the vehicle speed information, the stop condition being sectioned into a plurality of regions using steering thresholds for the steering information relating to the steering handle. Automatic stop control of the engine conforming to the intentions of the driver can be implemented by the vehicular engine control device.