HHCHill Hold Control
Temporarily holds brake pressure on slopes to prevent rollback during launch.
Standards
- ISO 26262 development path
- ESC/ABS integration
- Incline detection
- Auto-release logic
System overview
Hill Hold Control (HHC) is a driver-assistance feature that prevents a vehicle from rolling backward or forward when starting on an incline. Using wheel-speed, incline, or brake-pressure sensors, the system detects a slope and, when the driver releases the brake pedal, temporarily maintains brake pressure for a few seconds. This gives the driver time to move to the accelerator without rollback. Once sufficient drive force is applied, HHC releases the brakes smoothly. The hold typically lasts two to three seconds and is commonly paired with ESC and ABS.
Automatic brake hold detected via incline and pressure sensors
Smooth release once drive force is sufficient
Prevents rollback in stop-and-go traffic on slopes
Works with manual, automatic, and hybrid drivetrains
Technical profile
Capabilities and technical values are program-dependent and must be confirmed against the applicable OEM requirements, vehicle architecture and validation plan.
Problems it solves
- Solves rollback when moving from brake to accelerator on an incline.
- Reduces driver stress and clutch wear in hill traffic.
- Prevents contact with vehicles behind during hill starts.
Typical applications
- Manual-transmission vehicles frequently starting on slopes.
- Automatic and hybrid vehicles in hilly urban traffic.
- Platforms combining EPB Auto Hold with hill-start assist.
Technical profile
- Detection
- Wheel-speed, incline, and brake-pressure sensors
- Hold time
- Typically 2–3 seconds, tunable per OEM
- Release
- Smooth release when drive force is applied
- Integration
- Paired with ESC and ABS control units
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