The wheel speed and wheel unit simulator CW-311 simulates the tire pressure, tire temperature and wheel speed sensors used in the automotive industry. Its fields of application include HiL test environments for control units.

The CW-311 receives real-time and control data via the integrated CAN bus, from which it generates signals from wheel speed sensors and the wheel unit. It is possible to transmit simulation data from any desired source to the CW-311 via the CAN interface, for example, from an automation computer, which plays back a realistic route model.

The wheel speed information is issued via a current interface. And it is worth noting that it is possible to simulate sensors from different manufacturers. It is possible to dynamically influence diverse parameters, such as rolling direction and air gap, via the configuration interface.

The tire pressure and temperature data from the wheel unit are transmitted via a radio interface in the 433 MHz band; the transmission power is hardware configurable. The detachable pressure module automatically recognises different driving statuses from “parking” through to “travelling” via an internal finite state machine and implements the sensor protocols and data contents accordingly.


  • Simulates wheel speed, tire pressure and temperature sensors in a single device
  • Independently changes the operating statuses via an internal finite state machine
  • Physical interface of the wheel speed sensors (both current source and current sink) can be configured via hardware
  • Hardware configurable radio transmission power
  • 10 external trigger inputs to synchronize positions
  • Top-hat rail housing for quick and easy installation
  • Easy to extend and scale




Number: 1
Type: ISO 11898-2 (highspeed)
CAN-protocol version 2.0 A and 2.0 B, supports SAE J1939 (29-bit-identifier)
Data rate: 500 kbit/s, on request: 50, 100, 125, 250, 500, 800 and 1000 kbit/s
Termination: 120 Ohm, optional

Wheel speed simulation

Sensor types: Sensors with current source or current sink
Protocol: Active wheel speed simulation with or without additional function
Waveform sensor without additional function: Rectangular pulse with 50 % duty cycle
Waveform sensor withadditional function: Speed pulse (50 μs) and manchester-coded data (bit time 50 μs)  
Current low-level: 7 mA
Current high-level: 14 mA
Current level speed pulse: 28 mA (further current levels on request)
Load resistance: Current source: 50 - 380 Ohm
Current sink: 50 - 390 Ohm (external voltage 12 VDC)
Voltage positive contact max.: Current source: 13 VDC (digital signal for switching the source on and off)
Current sink: 15 VDC
Power dissipation max.: 500 mW

Transmission radio interface (WHEEL UNIT SIMULATION)

Modulation: FSK
Center frequency: 433,92 MHz (tolerance ± 70 kHz)
Frequency deviation: ± 30 kHz (tolerance ± 10 kHz)
Transmission rate: 19200 bit/s

Power Supply

Supply voltage: 9 VDC to 36 VDC
Current consumption: 110 mA to 180 mA at 12 VDC (without Wheel Unit Simulation)
180 mA to 240 mA at 12 VDC (with Wheel Unit Simulation)

Environmental conditions

Temperature range operation: -20 °C to +70 °C
Temperature range storage: -20 °C to +85 °C
Relative humidity operation: Max. 80%, non-condensing, no frost
Relative humidity storage: 35 % to 85 %, non-condensing


Housing: 45 mm-DIN-top-hat rail housing
Dimensions (LxWxH): 82 mm x 90 mm x 55 mm
Weight: 109 g


Datasheet CW-311

Download (PDF)

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