Vehicle Engine Auto-Stop Logic Using Movement Detection
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Solution Overview
Problem
Existing methods for automatically shutting down a motor vehicle engine when the driver is not present can lead to undesirable engine shutdowns, such as during ice scraping or when the vehicle is being prepared for a journey, and fail to account for situations where the driver wants the engine to remain running for heating or air conditioning purposes.
Innovation Solution
Implement a method where the automatic engine shutdown only occurs if the vehicle has been moved after starting, using a second predetermined criterion that includes movement detection, such as pressing the accelerator pedal or covering a minimum distance, to differentiate between intended non-driving phases and the end of a journey.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the engine is automatically switched off when driver absence is detected, then fuel consumption is reduced, but the engine shuts down in undesired situations such as during ice scraping or vehicle preparation
Solution Approach 1:
The system dynamically adjusts the automatic shutdown function based on detected vehicle movement. The control unit activates or deactivates the automatic shutdown depending on whether the vehicle has been moved since starting, allowing the system to adapt between fuel-saving mode (deactivated) and automatic shutdown mode (activated) without manual intervention
Solution Approach 2:
The system uses feedback from movement detection (accelerator pedal position, handbrake status, odometer data) to determine whether to enable or disable automatic shutdown. This feedback mechanism allows the system to learn from driving patterns and adjust its behavior accordingly, preventing false shutdowns while maintaining fuel efficiency
2Object-generated harmful factors
If the engine is automatically switched off when driver absence is detected, then emissions are reduced, but the driver cannot use vehicle equipment for heating or air conditioning without driving
Solution Approach 1:
The automatic shutdown function dynamically adapts to the driver's intentions by detecting vehicle movement. When the vehicle remains stationary (e.g., during ice scraping or preparation), the function is deactivated, allowing continued use of heating and air conditioning. When the vehicle is driven, the function activates to reduce emissions during idle periods
3Reliability
If the engine is not switched off automatically when driver absence is detected, then the engine remains available for immediate use, but fuel is wasted during idle periods
Solution Approach 1:
The system uses feedback from movement detection to determine when automatic shutdown should be enabled. After the vehicle has been moved a certain distance or for a certain time, the system enables automatic shutdown, balancing fuel savings with engine availability. The system learns from driving patterns to optimize the timing of shutdown activation
Data Source
Figure 1
AI summary
According to the invention, an automatic shut-off of the engine of a motor vehicle is only activated if the motor vehicle has been moved (S18) according to a specific criterion after the last starting procedure of the engine (S10). The undesired shut-off of an engine can thus be prevented in some situations, such as e.g. when a garage is being opened or when ice is being scraped off the windows of a motor vehicle.