BRAKE CONTROL SYSTEM


  1. OUTLINE


    1. The following brake control systems are provided: Anti-lock Brake System (ABS), Electronic Brake force Distribution (EBD), Brake Assist, Traction Control (TRC), Vehicle Stability Control (VSC), VSC and Cooperative Control with EPS*1 or VSC+*2 and Hill-start Assist Control.

      *1: Models for general countries

      *2: Models for Europe

  2. MAIN FEATURES


    1. Electronically Controlled Brake System


      1. The electronically controlled brake system uses a sensor to detect the amount of brake pedal depression. Based on this, the skid control ECU calculates the braking force and the brake booster with master cylinder assembly, brake booster pump assembly and brake actuator assembly control the brake fluid pressure of the 4 wheels.

      2. The electronically controlled brake system cooperates with the hybrid system to optimally control the brake fluid pressure and regenerative braking. This enhances the efficiency of energy regeneration and improves fuel economy.

      3. When the system is malfunctioning, brake control continues via the use of non-malfunctioning parts. Also, when the system is not operating, the brake fluid pressure generated in the brake master cylinder by the depression of the brake pedal works as a back-up mechanism to ensure braking force.

        Figure 1. Control Outline

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      4. Brake control apportions brake force to the hydraulic brake system and regenerative brake system at varying vehicle speeds as follows.

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  3. PRECAUTION


    1. ABS


      1. The ABS system cannot increase the performance limit of the tires. Always drive safely and be aware of the vehicle speed and distance to other vehicles.

      2. Any non-standard components such as non-standard tires that are installed may have a negative effect on the ABS function.

      3. When braking using ABS, the braking distance may be longer than vehicles without ABS in the following conditions:


        • When driving on a dirt road or a road covered with fresh snow

        • When using tire chains

        • When driving over a joint in the road surface

        • When driving on a rough road such as an unpaved or stone-paved road

    2. Brake Assist


      1. Brake assist cannot increase the performance limit of the fundamental brake system. Always drive safely and be aware of the vehicle speed and distance to other vehicles.

    3. TRC, VSC


      1. The TRC and VSC systems ensure traction and vehicle stability. Do not disable the TRC or VSC functions unless necessary.

      2. The TRC and VSC systems cannot increase the performance limit of the tires. Always drive the vehicle carefully in conditions in which drive wheel traction or vehicle stability may be lost.

    4. Hill-start Assist Control


      1. Hill-start assist control is not intended to keep the vehicle stationary on a hill for a prolonged period. As hill-start assist control only prevents the vehicle from rolling backwards for 2 seconds after the brake pedal is released, perform start-off within this period.

      2. When hill-start assist control is operating and the power switch is turned off, hill-start assist control will be canceled without warning.

      3. Hill-start assist control prevents the vehicle from rolling backwards by controlling the brake force to the 4 wheels. However, the vehicle may not remain stationary when on an extremely steep slope or a low friction surface such as ice.