System Description [12/2017 - 10/2023]

DESCRIPTION

The power steering ECU (rack and pinion power steering gear assembly) generates the necessary steering assist torque by calculating the steering assist force and controlling the motor current, based on the steering torque information from the torque sensor (rack and pinion power steering gear assembly), vehicle speed information from the skid control ECU (brake actuator assembly)*1 or skid control ECU assembly*2, and information from the ECUs.
1. *1: w/ Vacuum Brake Booster
2. *2: w/o Vacuum Brake Booster
When there is a drop in the power source voltage, the rear window defogger, windshield deicer, outer mirror heater, PTC heater and seat heater operations are limited as part of power steering system load control.
When there is a drop in the power source that may require an increase in steering force, the system illuminates the power steering warning light in order to warn the driver.

FUNCTION OF COMPONENTS:

Component		Function
Rack and pinion power steering gear assembly HINT: The part listed on the right is built-in	Power steering ECU	Calculates the motor operation current based on the steering torque and vehicle speed signals, and outputs it to the motor. When a malfunction is detected in the power steering system, it outputs a warning signal to the combination meter assembly.
	Power steering motor	Generates power assist according to the drive current received from the power steering ECU. The built-in motor rotation angle sensor detects the rotation angle of the motor.
	Torque sensor	Detects the steering torque.
	Deceleration mechanism	Decelerates the motor rotation torque and transmits it to the rack shaft.
Steering sensor		Detects the steering angle and steering direction.
Skid control ECU (brake actuator assembly)1 Skid control ECU assembly2		Sends the vehicle speed signal and steering coordinated control amount signal to the rack and pinion power steering gear assembly.
ECM		Outputs the engine speed.
Combination meter assembly		During a system malfunction, warns the driver by displaying a message on the multi-information display according to the nature of the problem in the system, illuminating the EPS warning light, illuminating the master warning light and sounding the multi-buzzer.
Air conditioning amplifier assembly		Receives load control request signal from the rack and pinion power steering gear assembly and limits the operation of the heater system load.