Stop-Start Control Inhibiting Engine Restart During Parking Brake Transition
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Solution Overview
Problem
Automatic stop-start systems in vehicles are disabled when battery levels are low, as they cannot simultaneously power the electric parking brake and the starter, leading to inefficiencies in fuel consumption and system functionality.
Innovation Solution
The system monitors the parking brake's transition state and inhibits engine restart until the brake is no longer in transition, separating the power demands on the battery to prevent simultaneous loading with the starter and brake actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the stop-start system is enabled at low battery levels, then fuel efficiency is improved through engine shutdown, but the battery may become overloaded when both the electric brake and starter require power simultaneously
Solution Approach 1:
The control system performs preliminary assessment of battery state (state of charge, temperature, aging) before enabling stop-start functionality. The system proactively monitors brake actuator power consumption patterns and predicts potential power conflicts, enabling the stop-start system only when battery capacity is sufficient to handle simultaneous demands of brake actuation and engine restart.
Solution Approach 2:
The system dynamically adjusts stop-start enablement based on real-time brake actuator power consumption characteristics. When the brake actuator is detected to be in a high-power consumption state (during actuation or release), the system dynamically disables stop-start functionality. When the brake actuator is in a low-power state, the system enables stop-start functionality, creating a dynamic adaptation to power availability.
2Speed
If the engine is automatically restarted immediately when power is needed, then vehicle responsiveness is improved, but the battery may be overloaded when the electric brake is simultaneously actuating
Solution Approach 1:
The control system continuously monitors brake actuator power consumption in real-time and uses this feedback to control stop-start enablement. The system detects when the brake actuator is consuming high power (during actuation or release phases) and immediately provides feedback to disable stop-start functionality, preventing simultaneous high-power demands on the battery.
Solution Approach 2:
The system performs preliminary monitoring of brake actuator state before allowing engine restart. By detecting brake actuator power consumption patterns in advance, the system can predict when power conflicts may occur and proactively disable stop-start functionality to prevent battery overload.
Data Source
AI summary
A system and method for controlling an automatic stop-start system of an automotive vehicle is disclosed. The system monitors the status of the parking brake to determine if the parking brake is in a state of transition between an applied state and a released state (in either direction). If the parking brake is in a state of transition, then the automatic re-starting of the engine is inhibited until the parking brake is no longer in a state of transition.