Electronic Stability Program Construction; Components Of Electronic Stability Program - Suzuki SX4 Service Manual

Electronic Stability Program Construction

10
10
1. ESP® control module
2. Hydraulic unit
3. ECM
4. BCM
5. Combination meter

Components of Electronic Stability Program

ESP® control module / hydraulic unit
The control module receives signals from each wheel speed sensor, ESP® OFF switch, brake master cylinder
pressure sensor (7), steering angle sensor and yaw rate / G sensor. Based on these signals as information, the control
module judges the vehicle conditions and controls the brake hydraulic pressure by combining the ON/OFF operation
of the solenoid in the hydraulic unit and the pump motor operation.
The hydraulic unit contains an inlet solenoid valve (8) and an outlet solenoid valve (9) for each wheel as well as a cut
solenoid valve (10) and a suction solenoid valve (11) for each hydraulic unit system. Also, a master cylinder pressure
sensor, pump motor (6), etc. are included. The hydraulic pressure control is done in 3 modes of pressure increase,
pressure keeping and pressure reduction.
• Pump motor:
The pump motor turns on and applies pressure to each brake when braking is activated in the TCS and stability
control state. When in the pressure reduction mode, it causes the brake fluid in the reservoir to return to the master
cylinder (1).
• Brake master cylinder pressure sensor:
This sensor detects the brake hydraulic pressure in the primary piping when brake is applied in the normal
condition. Also, it detects the pump motor driving state when brake is applied in the TCS and stability control state.
• Inlet solenoid valve:
In the ABS, TCS and stability control state, this valve is activated in the pressure keeping and pressure reduction
modes to open the fluid passage, thereby restricting increase of the hydraulic pressure applied to the brake caliper.
• Outlet solenoid valve:
In the ABS, TCS and stability control state, this valve is activated in the pressure reduction mode to open the fluid
passage, thereby lowering the hydraulic pressure kept in the brake caliper.
• Cut solenoid valve:
When brake is applied in the TCS and stability control state, this valve is activated to close the fluid passage,
thereby causing the hydraulic pressure generated by the pump motor to apply to the brake caliper.
• Suction solenoid valve:
When brake is applied in the TCS and stability control state, this valve is activated to open the fluid passage from
the master cylinder to the pump motor.
4
11
6
1
9
2
12
6. Steering angle sensor
7. Brake light switch
8. Yaw rate/ G sensor
9. Brake master cylinder pressure sensor
10. Wheel speed sensor
Electronic Stability Program:
5
8
3
7
13
14
11. ESP® OFF switch
12. Electronic signal
13. CAN signal
14. Hydraulic circuit
4F-3
S7RW0A4601005
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10
I7RS0B460001-03
S7RW0A4601006