Engine Control Apparatus Brake Variation Detection
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Solution Overview
Problem
Existing engine control systems for idle stop control may stop the engine against the vehicle driver's will, leading to discomfort and increased fuel consumption, as they do not adequately consider the driver's intention based on brake pedal operation variations during deceleration.
Innovation Solution
An engine control apparatus that detects the variation amount of brake operation during deceleration and determines whether to perform automatic engine stop based on this variation, allowing the stop only when the variation is within predetermined values, thereby respecting the driver's will and optimizing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If engine automatic stop control is implemented to reduce fuel consumption, then fuel efficiency is improved, but the system may stop the engine against the driver's will leading to discomfort and increased fuel consumption
Solution Approach 1:
The system performs preliminary detection of driver intention through brake operation variation analysis before executing engine stop control. By monitoring brake pedal operation patterns during deceleration and calculating variation amounts, the system determines driver intent in advance, preventing unwanted engine stops while maintaining fuel efficiency benefits
Solution Approach 2:
The system continuously monitors brake operation variations and uses this feedback to dynamically adjust engine stop control decisions. The variation amount detection provides real-time feedback about driver intention, allowing the control system to adapt its behavior and avoid stopping the engine when the driver intends to continue driving
2Use of energy by moving object
If engine stop control is activated during deceleration with brake pedal depression, then fuel consumption is reduced, but the vehicle cannot be accelerated promptly when needed
Solution Approach 1:
The system performs preliminary assessment of driver intention through brake operation patterns before activating engine stop control. By analyzing brake variation amounts during deceleration, the system ensures the engine remains running when rapid acceleration may be needed, thus maintaining acceleration responsiveness while still achieving fuel savings in appropriate conditions
Data Source
AI summary
An engine control apparatus is configured to perform engine automatic stop to automatically stop an engine when predetermined engine stop conditions are satisfied and automatically restart the engine when predetermined engine restart conditions are satisfied. The stop conditions including that a vehicle speed decreases below a predetermined stop permission speed. The engine control apparatus includes a variation amount detection means for detecting a variation amount of a brake operation being performed by the vehicle driver during a deceleration period from when the vehicle has started to decelerate to when the vehicle speed has decreased below the stop permission speed, and a stop determination means for determining whether the engine automatic stop should be performed when the engine stop conditions are satisfied based on the variation amount detected by the variation amount detection means.