Engine Stop Control Without Brake Pedal Input
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Solution Overview
Problem
Existing engine automatic stop restart control apparatuses require drivers to manually depress the brake pedal to stop the engine, leading to unnecessary fuel consumption and additional driver operations when the vehicle automatically stops without this action.
Innovation Solution
An engine automatic stop restart control apparatus that automatically stops the engine when predetermined vehicle stop conditions are met, excluding the need for driver-initiated brake pedal depression, and automatically restarts the engine based on preset conditions without requiring brake release, using modules for vehicle control, judgment, and restart management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driver's depression of brake pedal is required as an essential condition for engine automatic stop, then the engine stop control can be reliably triggered by driver intent, but the system requires additional driver operation and causes wasteful fuel consumption when the vehicle automatically stops without driver brake depression
Solution Approach 1:
The system automatically determines engine stop conditions by integrating vehicle automatic stop detection with engine control, eliminating the need for driver brake pedal operation. The control apparatus self-services by autonomously judging engine stop conditions based on vehicle state and driver intent detection, resolving the contradiction between reliability and ease of operation
Solution Approach 2:
The brake pedal operation is assigned dual functions: it serves as both the driver's normal braking control and as the trigger for engine automatic stop. When the vehicle automatically stops without brake depression, the system universally applies engine stop control based on integrated judgment of vehicle state and driver intent, eliminating the need for separate driver actions
2Device complexity
If the driver's depression of brake pedal is required as an essential condition for engine automatic stop, then the system maintains simple control logic, but it causes wasteful fuel consumption and requires additional driver operation when the vehicle automatically stops
Solution Approach 1:
The system performs preliminary judgment of engine stop conditions by detecting vehicle automatic stop state and driver intent before actual engine stop execution. This preliminary action allows the system to proactively prepare for engine stop when conditions are met, eliminating wasteful fuel consumption while maintaining simple control logic through integrated judgment
Solution Approach 2:
The control apparatus continuously monitors vehicle state, driver operations, and automatic stop conditions, using feedback to dynamically adjust engine stop control decisions. This feedback mechanism enables simple control logic to achieve optimal fuel efficiency by automatically stopping the engine when vehicle automatic stop occurs without driver brake depression
Data Source
AI summary
In a vehicle having idle stop functions and low vehicle speed-following drive functions, when a vehicle automatic stop flag F2 is identified as 1 at step S220, determines whether all engine stop conditions except depression of brake pedal are satisfied in step S240. When it is determined all the engine stop conditions except depression of the brake pedal are satisfied, ignition and fuel injection in each cylinder of engine are stopped to automatically stop the engine in step S260. In this arrangement, the driver's depression of brake is excluded from the engine stop conditions. Therefore, even when the motor vehicle automatically stops without the driver's depression of brake, the engine is automatically stopped.