Lateral Acceleration Sensor

Lateral Acceleration sensor

The electronic stabilisation program uses a sensor to measure the lateral acceleration acting on the car in order to calculate its actual position. Lateral acceleration acts on a car sideways to the direction of travel. It is noticeable as a centrifugal force moving a car to the outside of a curve when cornering.

To suppress the effect of the abnormality of a lateral acceleration sensor on a control system to the minimum degree by accurately detecting said abnormality by an apparatus available from the aspect of cost by mounting the lateral acceleration sensor, a wheel speed detection mans, a lateral acceleration estimation and operation mans, a sensor abnormality detection means and a fail-safe operation means.

Location Sensor

The lateral acceleration sensor is located in the same housing as the rotation (yaw) rate sensor (duo-sensor).

ECU Dynamic Stability Control

Function

The lateral acceleration sensor provides a signal based on the lateral or side force presented on the vehicle through the curve. The sensor has a fixed electrode and a movable electrode that changes the capacitance of the sensor when laterally loaded.

Acceleration can be determined from a pendulum-type sensor using strain gauges linked to a mass, or devices similar to an engine knock sensor.

The lateral acceleration sensor measures the g-force from a turn and sends that information also to the ECU.

Operation

The Yaw rate sensor measures the rotation rate of the car. The sensor determines how far off-axis a car is “tilting” in a turn. This information is then fed into a microcomputer that compares the data with wheel speed, steering angle and accelerator position, and, if the system senses too much yaw, the appropriate braking force is applied.

In combination with the integrated lateral-acceleration sensor, the status of the vehicle can be determined and compared with the driver´s intention. The lateral acceleration sensor measures the g-force from a turn and sends that information also to the ECU. Lastly, the wheel speed sensors measures the wheel speed.

Advantanges

For safety car Improved tractive force. Better safety and stability on poor surfaces. Less driver stress. Longer tyre life. No wheel spin on turning and cornering

Steering Angle Sensors

Steering angle sensors measure the rotation angle, angle velocity and direction of the steering wheel, providing information on the direction in which the driver wishes to go. Steering angle sensors are required for systems such as ESC and are also used in electric power steering and active steering systems (EPS or AFS) as well as parking assistance systems and curve lights.

Definition:

It is used to measure the overall steering angle during the movement of the steering wheel.

Requirement:

To monitor the movement of the steering wheel and send an electronic signal the computer.

Function Steering angle sensor

The steering angle sensor can measure the full 360º movement of the steering wheel. The sensor consists of potentiometer, that is used to control the voltage supplied to indicate the steering angle(position of the wheel). The first sensors used controlled the pressure in the steering system to compensate for the speed of the vehicle using valves in the steering pressure lines. These systems were known as variable speed steering.

Later models linked these sensors to many other systems such as braking, acceleration, and steering. On newer vehicles with stability control systems, if the wheel is moved slowly, there is no need for computer interaction.If the wheel is moved rapidly, the computer may over-ride braking, acceleration and even the steering itself to try to prevent loss of control or rollovers.

Component Steering Angle Sensor