Civic L4-1.3L Hybrid (2008)
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Checks for system failures.
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Controls the motor on the power unit.
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Controls the LED indicators.
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Controls the buzzer.
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Receives the brake pedal stroke sensor signal.
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Creep aid system (CAS), in conjunction with the PCM (CVT system).
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Controls the regenerative system in conjunction with the PCM (IMA system).
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Brake assist.
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Receives the pressure sensors signal.
Safety Structure of Motor Control
The pump motor is operated by the servo unit. The servo unit has independent main activation and subactivation circuits in the ECU (electronic
control unit). If either circuit has a problem, the other one will run the pump motor.
Creep Aid System (CAS)
The CAS keeps the brakes applied when CVT control requires it during auto idle stop. This prevents the vehicle from rolling forward or backward
while the driver releases the brake pedal (to press the accelerator pedal) and the engine starts. When the CVT requires the CAS function, the servo unit
operates the solenoid valves to maintain the brake fluid pressure to the master cylinder. The brake fluid pressure is reduced gradually while the
solenoid valves in the servo unit are operating.
After the engine starts and the brake pedal is released, the CVT no longer requires the CAS.
Regenerative Control Cooperation
When the driver decelerates or stops by pressing the brake pedal, the servo unit communicates with the PCM to control the balance between the
regenerative control and the normal brake system.
In this case, the brake pedal reaction force is the same as a conventional brake system, and the driver is unaware of these controls.
Brake Assist
When the driver does emergency braking the servo unit senses the quick rise in the brake pressure. In this case, the servo unit adds pressure to the
inner cylinder, and assists the brake pedal application for the driver.
This control ends at the end of the brake application, when the vehicle stops, the brake pedal is released, or if the system has a problem.
