Start-Stop Device Engine Restart Dynamics
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Solution Overview
Problem
Current start-stop systems in vehicles often fail to automatically restart the engine at the appropriate time, leading to inefficient energy use and conflicting with driver intentions, especially in urban traffic scenarios where the engine is switched off while the vehicle is stationary or decelerating.
Innovation Solution
A start-stop device that evaluates brake pedal dynamics, traffic conditions, and surrounding information to determine the driver's requested driving dynamic, triggering an automatic engine restart only when necessary, such as during high brake pedal release speeds or specific driving maneuvers, and preventing restarts when further travel is unlikely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine is automatically switched off while the vehicle is traveling, then fuel consumption is reduced, but the driver's driving dynamic requirements may not be met
Solution Approach 1:
The system dynamically adjusts engine restart behavior based on detected driving patterns. When high brake pedal release dynamics are detected, the system anticipates acceleration needs and restarts the engine proactively. This dynamic adaptation allows the system to reduce fuel consumption during low-demand periods while meeting driver requirements during high-demand situations.
Solution Approach 2:
The system performs preliminary engine restart actions based on anticipated driver needs. By detecting high brake release dynamics and anticipating subsequent acceleration requirements, the engine is restarted before the driver actually demands it, ensuring readiness while optimizing fuel consumption during the transition period.
2Speed
If the engine is automatically restarted when the brake is released, then driving readiness is improved, but unnecessary restarts increase energy consumption
Solution Approach 1:
The system continuously monitors brake pedal dynamics and uses this feedback to intelligently determine when engine restart is necessary. By analyzing the rate and extent of brake release, the system distinguishes between temporary releases (where restart is unnecessary) and significant releases indicating upcoming acceleration (where restart is beneficial), thereby optimizing the balance between readiness and energy consumption.
Solution Approach 2:
The system changes the restart decision parameter from a simple binary condition to a dynamic assessment based on brake pedal release characteristics. By evaluating parameters such as brake release speed and duration, the system adapts its restart behavior to match actual driving conditions, reducing unnecessary restarts while maintaining readiness when needed.
3Loss of time
If the engine restart is triggered by brake pedal release, then response time is improved, but false triggers occur during normal braking maneuvers
Solution Approach 1:
The system uses dynamic analysis of brake pedal release characteristics to distinguish between genuine acceleration requests and normal braking maneuvers. By evaluating the dynamics of brake release rather than simply detecting its occurrence, the system achieves rapid response to legitimate restart needs while filtering out false triggers from routine driving actions.
4Loss of information
If the start-stop device monitors footwell monitoring signals, then driver intent recognition is improved, but system complexity increases
Solution Approach 1:
The system uses the existing footwell monitoring unit, originally designed for other purposes, to also detect brake pedal release dynamics. This multi-functional use of the sensor allows the start-stop system to recognize driver intent without adding dedicated sensors or significantly increasing system complexity, leveraging existing infrastructure for enhanced functionality.
Data Source
AI summary
A start/stop device initiates an automatic activation process of an automatically deactivated drive machine of a motor vehicle, in particular of a motor vehicle with an automatic transmission. The drive machine can be automatically deactivated when the motor vehicle is traveling, and the automatically deactivated drive machine can be activated on the basis of driver actions. The start/stop device is configured to initiate an automatic activation of the drive machine which is automatically deactivated when the motor vehicle is traveling on the basis of a detected drive dynamic desired by the driver.