HSA (Hill Start Assist)

This system prevents vehicles rolling backwards and makes hill starts easier by holding the braking force during the time when the driver is moving his/her foot from the brake pedal to the accelerator pedal in order to start the vehicle on a steep road.

When the system determines that the vehicle is stopped on a steep road from the information of various sensors and the ECUs, the system will hold the braking force after the driver releases the brake pedal until the driver depress the accelerator pedal (for a maximum of two seconds). The system will reduce the braking force in accordance with the operation of the accelerator by the driver and the engine torque that is generated.

  • HSA also functions when the vehicle is reversing up a steep road.
HSA Function

HSA Function

HSA System Diagram

HSA System Diagram

  • Depending on the road surface conditions, the vehicle may roll backwards.