Steering Wheel Angle Sensor LWS

This sensor is designed to measure rotational movement and angular speed, e.g. steering wheel angle and steering wheel speed.

In order to achieve this, the sensor is using the giant magneto resistive (GMR) effect. The detection of the absolute angle is realized by means of toothed measuring gears with different ratio including small magnets. Corresponding GMR elements that change their electrical resistance according to the magnetic field direction detects the angle position of the measuring gears.

The measured voltages are A/D converted and a microcontroller performs the angle calculations. The steering angle and the steering angle speed are provided on a CAN-interface.

 

Features

  • Steering Wheel Angle: ± 780°
  • Angular Speed: 0 to 1,016°/s
  • 500 kbaud CAN-output

Application

Steering wheel angle

± 780°

Angular speed

0 to 1,016°/s

Operating temperature range

-40 to 85°C

Technical Specifications

Mechanical Data

Weight

Approx. 34 g

Size

83 x 60 x 21.35 mm

Protection class

IP5K0

Electrical Data

Power supply

7 to 16 V

Max input current

< 150 mA

CAN speed

500 kbaud

CAN Message

CAN ID 01 0x2B0 LWS_Standard

Byte

Value / Bit

 

7

6

5

4

3

2

1

0

0

LWS_ANGLE

1

LWS_ANGLE

2

LWS_SPEED

3

Reserved

TRIM

CAL

OK

4

Reserved

CAN ID 02 0x7C0 LWS_Config

Byte

Value / Bit

 

7

6

5

4

3

2

1

0

0

Reserved

CCW

1

Reserved

Signal Overview

OK

Failure status

1

Sensor information valid

0

Sensor information invalid, an internal sensor fault occurred

CAL

Calibration status

1

Sensor calibrated

0

Sensor not calibrated

TRIM

Trimming Status

1

Sensor trimmed

0

Sensor not trimmed, this is handled as a sensor failure (OK = 0)

CCW

Command code word

3h

Sets the signal LWS_Angle to 0°

5h

Resets the calibration status of the angle

 

Characteristics

Steering Wheel Angle

 

Measuring range

± 780°

Absolute physical resolution

0.1°

Nonlinearity

± 2.5°

Hysteresis

0° to 5°

Angular Speed

 

Measuring range

0 to 1016°/s

Over range limit

± 2,500°/s

Absolute physical resolution

4°/s

Connectors and Wires

Connector

Bosch 7 pole

Mating connector

F 02U B00 656-01

Pin 1

Gnd

Pin 2

12 V

Pin 3

CAN High

Pin 4

CAN Low

Pin 5

Not connected

Pin 6

Not connected

Pin 7

Not connected

CAN Parameters

Byte order

LSB (Intel)

CAN speed

500 kbaud

CAN update rate

100 Hz / 10 ms

Installation Notes

The LWS can be connected directly to most control units and data logger systems via CAN bus.

Please avoid abrupt temperature changes.

Please ensure that the environmental conditions do not exceed the sensor specifications.

Please find further application hints in the offer drawing.

A zero adjustment is needed before using the sensor for the first time. To do so, reset the calibration with CCW = 5h. After resetting the calibration, a new calibration needs to be started with CCW = 3h. The sensor is now newly calibrated and can be used immediately.

Zero the sensor after every assembly.

Safety Note

The sensor is not intended to be used for safety related applications without appropriate measures for signal validation in the application system.

Ordering Information

Steering Wheel Angle Sensor LWS

Order number: F 02U V02 894-01

Dimensions

Housing Size

Downloads