Stop-Start Control Logic for Fuel Saving in Manual Vehicles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In micro-hybrid motor vehicles with manual gear shift, the existing stop-start systems require the driver to keep the brake released while actuating the clutch, leading to inconvenient and inefficient fuel consumption, as drivers often depress the clutch pedal prematurely, increasing fuel usage.
Innovation Solution
A method that automatically restarts the internal combustion engine based on the actuation states of the clutch and brake, where the engine is started only when the clutch is fully actuated and the brake is released, with a timer managing the brake start flag to delay engine restart if the brake is depressed shortly before the clutch, ensuring the engine is restarted at the optimal time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine is restarted when the driver actuates the clutch (as in prior art), then the engine starts up reliably, but the driver cannot extend the stop time for fuel saving when waiting at traffic lights
Solution Approach 1:
The system performs preliminary detection of the brake actuation state before the clutch actuation. By checking whether the brake was actuated within a preset period before clutch actuation, the system proactively determines whether to delay engine restart, allowing the engine to continue running when the driver is preparing for departure rather than waiting at a traffic light.
Solution Approach 2:
The engine restart condition is made dynamic based on the temporal relationship between brake and clutch actuation. The control device adjusts the restart timing by comparing the actuation timestamps of brake and clutch pedals, allowing the system to adapt to different driving scenarios (immediate departure vs. extended waiting) without requiring manual driver input.
2Use of energy by moving object
If the brake start flag is set when the brake is actuated, then the engine restart is delayed appropriately, but the system complexity increases with additional control logic
Solution Approach 1:
The control logic is segmented into distinct functional modules: a detection unit that monitors brake and clutch actuation states, a timer unit that tracks the preset period duration, and a control unit that executes the restart decision based on the brake start flag. This modular segmentation makes the complex control logic more manageable and implementable.
Solution Approach 2:
The brake start flag acts as an intermediary variable that mediates between the brake actuation detection and the engine restart control. Instead of directly complex control logic, the flag serves as a simple binary state that captures the temporal relationship between brake and clutch actuation, simplifying the overall control structure.
Data Source
AI summary
A method for automatic restarting a temporarily shut-down internal combustion engine with automatic stop-start in a motor vehicle with manual gear shift on the basis of conditions including the current actuation states of clutch and brake includes determining a current actuation state of a clutch and a wheel brake, and, if the brake has been actuated within a preset period before any actuation of the clutch, starting the engine when the clutch is fully actuated and the brake is released.