Examkin

Question

Difficulty: MediumSteering Systems

Modern motor vehicles frequently utilize electronic power-assisted steering (EPS) rather than hydraulic pumps to improve fuel economy and steering control. In an EPS system, which sensor measures the rotational effort applied by the driver to the steering shaft to determine the exact amount of electric motor assist needed?

  1. A
    Suspension ride height sensor
  2. Steering torque sensorAnswer
  3. C
    Differential pinion speed sensor
  4. D
    Brake line hydraulic pressure sensor

Answer

Steering torque sensor
The steering torque sensor is mounted on the steering column or pinion gear assembly and measures the twisting force (torque) exerted by the driver on an internal torsion bar. The electronic power steering module uses this measurement along with vehicle speed data to calculate and command the precise amount of electric motor assist required.

Step-by-Step Solution

1
Identify the operating principle of an Electronic Power Steering (EPS) system.
EPS replaces hydraulic assist with an electric motor that supplies rotational assist torque to the steering column or rack.
Understanding the input requirements of the electronic control unit (ECU) is necessary to determine which sensor is being queried.
2
Analyze how the EPS control module determines the magnitude and direction of motor assist.
The control module requires a real-time measurement of how hard the driver is turning the steering wheel (torsional force).
Without measuring driver input torque, the system cannot regulate assist smoothly or proportionately.
3
Select the component engineered specifically to measure this torsional input force.
The steering torque sensor, typically mounted to a torsion bar on the steering column or pinion shaft, outputs this precise signal.
The torque sensor is the dedicated sensor for measuring driver turning effort in EPS architectures.

Key Concept

Electronic Power Steering Torque Sensing and Motor Assist
Estimated Time:1m 0s
Rate this question

Topics

Steering Systems

More questions from this topic