Automatic Stop-and-Start Device Slope Roll-back Prevention
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Solution Overview
Problem
Automatic stop-and-start devices for vehicle engines face challenges in ensuring a stable brake force during engine restart on slopes, as voltage drops can prevent the brake system from functioning properly, leading to potential vehicle roll-back.
Innovation Solution
An automatic stop-and-start device with an engine control unit and a brake control unit that determines whether the brake state is held and only starts the engine after confirming the brake state is maintained, ensuring a reliable brake force is applied, and releases the brake state after a complete engine explosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power is supplied to the starter to start the engine automatically, then the engine can be started, but a voltage drop occurs in the vehicle power source system causing the brake device to fail and the vehicle to roll back
Solution Approach 1:
The brake control unit is configured to hold the brake state before the engine starts automatically. This preliminary action ensures that the brake force is already applied and stable before the starter motor engages, preventing vehicle roll-back even when voltage drops occur during engine starting.
2Reliability
If brake control is performed simultaneously with engine start, then vehicle roll-back is prevented, but voltage drop prevents the brake device from functioning properly
Solution Approach 1:
The system applies brake force before engine start, ensuring vehicle stability is established in advance. The brake control unit holds the brake state during the engine starting process, maintaining vehicle stability even when power source stability deteriorates due to voltage drop.
Data Source
AI summary
A vehicle is reliably prevented from rolling back during automatic start on a slope or the like. An automatic stop-and-start device includes an engine control unit 10 that automatically stops an engine 2 when a predetermined stop condition is fulfilled and automatically starts the engine 2 when a predetermined start condition is fulfilled; a brake device 3 that imparts a brake force to a vehicle that carries the engine 2; and a brake control unit 16 that holds a brake state produced by the brake device 3 when a predetermined brake hold request condition is fulfilled and releases the brake state produced by the brake device 3 when a predetermined brake release condition is fulfilled. The engine control unit 10 determines whether the brake control unit 16 holds the brake state produced by the brake device 3 and automatically starts the engine 2 when the determination is affirmed.