Valve Operation
Each valve is operated and fluid pressure of brake caliper is controlled.
When Ordinary Brake Is Applied
|
Name |
Not activated |
When depressing brake pedal |
|
Cut valve 1 |
Power supply is not supplied (open) |
Power supply is not supplied (open) |
|
Cut valve 2 |
Power supply is not supplied (open) |
Power supply is not supplied (open) |
|
Suction valve 1 |
Power supply is not supplied (close) |
Power supply is not supplied (close) |
|
Suction valve 2 |
Power supply is not supplied (close) |
Power supply is not supplied (close) |
|
ABS IN valve |
Power supply is not supplied (open) |
Power supply is not supplied (open) |
|
ABS OUT valve |
Power supply is not supplied (close) |
Power supply is not supplied (close) |
|
Each caliper (fluid pressure) |
-- |
Pressure increases |
Front RH caliper
- Pressurized brake fluid from accumulator is supplied to front RH caliper through master cylinder part, cut valve 1 and ABS IN valve.
Front LH caliper
- Pressurized brake fluid from accumulator is supplied to front LH caliper through master cylinder part, cut valve 1 and ABS IN valve.
Rear RH caliper
- Pressurized brake fluid from accumulator is supplied to rear RH caliper through master cylinder part, cut valve 2 and ABS IN valve.
Rear LH caliper
- Pressurized brake fluid from accumulator is supplied to rear LH caliper through master cylinder part, cut valve 2 and ABS IN valve.
ABS Is Operating (When Pressure Increases)
|
Name |
Not activated |
When Pressure Increases |
|
Cut valve 1 |
Power supply is not supplied (open) |
Power supply is supplied (close) |
|
Cut valve 2 |
Power supply is not supplied (open) |
Power supply is not supplied (open) |
|
Suction valve 1 |
Power supply is not supplied (close) |
Power supply is supplied (open) |
|
Suction valve 2 |
Power supply is not supplied (close) |
Power supply is not supplied (close) |
|
ABS IN valve |
Power supply is not supplied (open) |
Power supply is not supplied (open) |
|
ABS OUT valve |
Power supply is not supplied (close) |
Power supply is not supplied (close) |
|
Each caliper (fluid pressure) |
-- |
Pressure increases |
Front RH caliper
- Pressurized brake fluid from accumulator is supplied to front RH caliper through master cylinder part, cut valve 2, suction valve 1 and ABS IN valve.
Front LH caliper
- Pressurized brake fluid from accumulator is supplied to front LH caliper through master cylinder part, cut valve 2, suction valve 1 and ABS IN valve.
Rear RH caliper
- Pressurized brake fluid from accumulator is supplied to rear RH caliper through master cylinder part, cut valve 2 and ABS IN valve.
Rear LH caliper
- Pressurized brake fluid from accumulator is supplied to rear LH caliper through master cylinder part, cut valve 2 and ABS IN valve.
ABS Is Operating (When Pressure Holds)
|
Name |
Not activated |
When Pressure Increases |
|
Cut valve 1 |
Power supply is not supplied (open) |
Power supply is supplied (close) |
|
Cut valve 2 |
Power supply is not supplied (open) |
Power supply is not supplied (open) |
|
Suction valve 1 |
Power supply is not supplied (close) |
Power supply is supplied (open) |
|
Suction valve 2 |
Power supply is not supplied (close) |
Power supply is not supplied (close) |
|
ABS IN valve |
Power supply is not supplied (open) |
Power supply is supplied (close) |
|
ABS OUT valve |
Power supply is not supplied (close) |
Power supply is not supplied (close) |
|
Each caliper (fluid pressure) |
-- |
Pressure holds |
Front RH caliper
- ABS IN valve is close, fluid pressure of front RH caliper is holds.
Front LH caliper
- ABS IN valve is close, fluid pressure of front LH caliper is holds.
Rear RH caliper
- ABS IN valve is close and fluid pressure of rear RH caliper is holds.
Rear LH caliper
- ABS IN valve is close and fluid pressure of rear LH caliper is holds.
ABS Is Operating (When Pressure Decreases)
|
Name |
Not activated |
When pressure decreases |
|
Cut valve 1 |
Power supply is not supplied (open) |
Power supply is supplied (close) |
|
Cut valve 2 |
Power supply is not supplied (open) |
Power supply is not supplied (open) |
|
Suction valve 1 |
Power supply is not supplied (close) |
Power supply is supplied (open) |
|
Suction valve 2 |
Power supply is not supplied (close) |
Power supply is not supplied (close) |
|
ABS IN valve |
Power supply is not supplied (open) |
Power supply is supplied (close) |
|
ABS OUT valve |
Power supply is not supplied (close) |
Power supply is supplied (open) |
|
Each caliper (fluid pressure) |
-- |
Pressure decreases |
Front RH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of front RH caliper is decreased.
Front LH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of front LH caliper is decreased.
Rear RH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of rear RH caliper is decreased.
Rear LH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of rear LH caliper is decreased.
VDC Is Operating (When Pressure Increases)
|
Name |
Not activated |
When pressure increases |
|
Cut valve 1 |
Power supply is not supplied (open) |
Power supply is supplied (close) |
|
Cut valve 2 |
Power supply is not supplied (open) |
Power supply is supplied (close) |
|
Suction valve 1 |
Power supply is not supplied (close) |
Power supply is supplied (open) |
|
Suction valve 2 |
Power supply is not supplied (close) |
Power supply is supplied (open) |
|
ABS IN valve |
Power supply is not supplied (open) |
Only in wheel that the pressure is to be increased: Power supply is not supplied (open) Wheel other than the one that the pressure is to be increased: Power supply is supplied (close) |
|
ABS OUT valve |
Power supply is not supplied (close) |
Power supply is not supplied (close) |
|
Each caliper (fluid pressure) |
-- |
Pressure increases (only in wheel that the pressure is to be increased) |
Front RH caliper
- Pressurized brake fluid from accumulator is supplied to front RH caliper through suction valve 2, suction valve 1 and ABS IN valve. When not increasing, ABS IN valve is closed and brake fluid is not supplied to front RH caliper.
Front LH caliper
- Pressurized brake fluid from accumulator is supplied to front LH caliper through suction valve 2, suction valve 1 and ABS IN valve. When not increasing, ABS IN valve is closed and brake fluid is not supplied to front LH caliper.
Rear RH caliper
- Pressurized brake fluid from accumulator is supplied to rear RH caliper through suction valve 2 and ABS IN valve. When not increasing, ABS IN valve is closed and brake fluid is not supplied to rear RH caliper.
Rear LH caliper
- Pressurized brake fluid from accumulator is supplied to rear LH caliper through suction valve 2 and ABS IN valve. When not increasing, ABS IN valve is closed and brake fluid is not supplied to rear LH caliper.
VDC Is Operating (When Pressure Holds)
|
Name |
Not activated |
When pressure holds |
|
Cut valve 1 |
Power supply is not supplied (open) |
Power supply is supplied (close) |
|
Cut valve 2 |
Power supply is not supplied (open) |
Power supply is supplied (close) |
|
Suction valve 1 |
Power supply is not supplied (close) |
Power supply is supplied (open) |
|
Suction valve 2 |
Power supply is not supplied (close) |
Power supply is supplied (open) |
|
ABS IN valve |
Power supply is not supplied (open) |
Only wheel that the pressure is to be holds: Power supply is supplied (close) Wheel other than the one that the pressure is to be holds: Power supply is not supplied (open) |
|
ABS OUT valve |
Power supply is not supplied (close) |
Power supply is not supplied (close) |
|
Each caliper (fluid pressure) |
-- |
Pressure holds (only wheel that the pressure is to be holds) |
Front RH caliper
- ABS IN valve is close, fluid pressure of front RH caliper is holds.
Front LH caliper
- ABS IN valve is close, fluid pressure of front LH caliper is holds.
Rear RH caliper
- ABS IN valve is close, fluid pressure of rear RH caliper is holds.
Rear LH caliper
- ABS IN valve is close, fluid pressure of rear LH caliper is holds.
VDC Is Operating (When Pressure Decreases)
|
Name |
Not activated |
When pressure decreases |
|
Cut valve 1 |
Power supply is not supplied (open) |
Power supply is supplied (close) |
|
Cut valve 2 |
Power supply is not supplied (open) |
Power supply is supplied (close) |
|
Suction valve 1 |
Power supply is not supplied (close) |
Power supply is supplied (open) |
|
Suction valve 2 |
Power supply is not supplied (close) |
Power supply is supplied (open) |
|
ABS IN valve |
Power supply is not supplied (open) |
Only in wheel that the pressure is to be decreased: Power supply is supplied (close) Wheel other than the one that the pressure is to be decreased: Power supply is not supplied (open) |
|
ABS OUT valve |
Power supply is not supplied (close) |
Only in wheel that the pressure is to be decreased: Power supply is supplied (open) Wheel other than the one that the pressure is to be decreased: Power supply is not supplied (close) |
|
Each caliper (fluid pressure) |
-- |
Pressure decreases (only in wheel that the pressure is to be decreased) |
Front RH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of front RH caliper is decreased.
Front LH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of front LH caliper is decreased.
Rear RH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of rear RH caliper is decreased.
Rear LH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of rear LH caliper is decreased.
Component Parts and Function
|
Component |
Function |
|
Pump |
Operates the pump drive according to signals from ABS actuator and electric unit (control unit) by the motor. |
|
Motor |
Operates the motor drive according to signals from ABS actuator and electric unit (control unit). |
|
Accumulator |
The accumulator accumulates brake fluid conveyed by the motor and pump. |
|
ABS IN valve |
Increases, holds or decreases the fluid pressure of each caliper according to signals from ABS actuator and electric unit (control unit). |
|
ABS OUT valve |
Increases, holds or decreases the fluid pressure of each caliper according to signals from ABS actuator and electric unit (control unit). |
|
Cut valve 1 Cut valve 2 |
Shuts off the ordinary brake line from master cylinder to signals from ABS actuator and electric unit (control unit). |
|
Suction valve 1 |
Suction valve 1 switches the brake line to convey accumulator pressure to the front system, according to a signal transmitted from the ABS actuator and electric unit (control unit). |
|
Suction valve 2 |
Suction valve 2 releases accumulator pressure, according to a signal transmitted from the ABS actuator and electric unit (control unit). |
|
Accumulator pressure sensor |
The accumulator pressure sensor detects brake fluid pressure accumulated in the accumulator and conveys the detected result to the ABS actuator and electric unit (control unit). |
|
Master cylinder pressure sensor |
Detects the brake fluid pressure of master cylinder part and transmits a signal to ABS actuator and electric unit (control unit). |