고정밀 조향센서 : The CLS

혁신적인 CLS-x 조향력 센서는 차량의 원래 스티어링 휠을 그대로 사용하며 x, y, z 방향의 조향 토크, 각도, 조향 속도 및 가속도를 측정하는 고정밀 센서입니다. 승용차, 트럭 또는 건설 기계에 관계없이 설치가 가능하여 CLS-x 센서는 간단하게 스티어링 칼럼과 스티어링 휠 사이에 설치됩니다. 에어백을 포함한 모든 스티어링 휠의 기능은 온전히 사용이 가능합니다.

CLS의 주요 정보 :

  • 토크, 각도 및 속도 측정
  • X, Y, Z 3축 가속도 측정
  • 세계에서 가장 작고 가벼운 센서
  • 자율 주행 테스트에 최적화
  • 거의 모든 차량에 빠르고 쉬운 설치

표준에 적합한 CLS :

  • ISO 4138 Steady-state circular driving
  • ISO 7975 Braking in a turn
  • ISO 7401 Lateral transient response test
  • ISO 3888 Severe lane-change maneuver
  • ISO 7401 Sinus weave test
  • ISO 17288 Free-steer behavior
  • ECE-R 79 Steering equipment
  • NHTSA Fishhook test (tipping stability)

테스트를 위한 혁신적인 스티어링 센서

CLSx 센서는 토크, 조향 각도 및 속도를 고정밀로 측정합니다. 또한 스티어링 칼럼의 중심 (x, y, z 방향)의 가속과 회전 가속도를 측정합니다. CLSx는 하우징 크기뿐만 아니라 측정 값의 해상도 및 정확도에 대한 새로운 표준을 설정합니다.

24 비트의 고해상도 A/D 컨버터는 특히 3Nm 미만의 작은 범위에서도 우수한 신호 품질과 노이즈없는 결과를 보장합니다. 이는 운전자 지원 시스템 및 자율 주행을 테스트하여 과압 토크를 결정할 때 특히 중요합니다. 센서 하우징의 혁신적인 디자인과 결합되어 0.1% FS (±100Nm에서)의 매우 정확한 조향 토크 측정이 가능합니다. 센서의 torsional stiffness은 100Nm에서 0.025°입니다.

 

Measured variables

  • Torque ±100 Nm (others on request)
  • Steering angle ±1440° (± 4 revolutions)
  • Steering velocity ±2048°/sec
  • Acceleration in x, y & z directions
  • Rotational acceleration

Award Winner

The CLSx is much smaller than comparable products. In addition, we were able to significantly improve the measuring accuracy of the sensor through the optimized design.

Florian Sailer, CAEMAX Technologie GmbH

These advantages convinced both the editorial staff of the trade journal messtec drives automation and the specialist audience: The CLSx was awarded the Messtec & Sensor Masters Award in the sensor category.

Comfortable and quick mounting

CLSx 센서는 간단하게 원래의 스티어링 휠과 스티어링 칼럼 사이에 설치됩니다. 원래 휠의 배선 (LIN bus)은 그대로 사용이 가능하여 모든 전자 기능과 에어백을 사용 할 수 있습니다. 30mm의 사이즈로 매우 협소한한 공간에 설치가 가능합니다.

차량에 따라 제조되는 CAEMAX 어댑터 시스템을 통해 CLSx 센서는 전 세계적으로 사용 가능한 거의 모든 차량 유형에 사용할 수 있습니다. 차량의 ESP 기능은 차량에 ESP-CLSx센서 옵션으로 제공되는 어댑터에 의해 유지됩니다. 짧은 설치 시간과 토크 및 회전 각도에 대한 원격 영점 조정과 같은 편리한 소프트웨어 기능을 통해 시스템은 매우 짧은 시간에 테스트 준비가 완료됩니다.

Applications

CLS 센서는 자동차, 건설 기계, 자율 주행 차량의 조향 시스템 검증 등에 활용이 가능합니다.

Steering system setup

The CLSx steering sensor is particularly suitable for use in driving dynamics tests such as:

  • ISO 4138 Steady-state circular driving
  • ISO 7975 Braking in a turn
  • ISO 7401 Lateral transient response test
  • ISO 3888 Severe lane-change maneuver
  • ISO 7401 Sinus weave test
  • ISO 17288 Free-steer behavior
  • ECE-R 79 Steering equipment
  • NHTSA Fishhook test (tipping stability)

Evaluation of driver assistance systems and autonomous driving

When operating vehicles with driver assistance systems, Advanced Driver Assistance Systems (ADAS) and autonomous driving functions, the following still applies: the driver is responsible and must be able to control his vehicle at all times. This means that steering maneuvers by ADAS systems such as lane keeping and lane change assistants must be able to be influenced manually by the driver at any time. The steering torque required for this - also known as overpressure torque - must not exceed 3 Nm.  The CLSx steering sensor is ideal for investigating this overpressure torque, as it delivers high-resolution results even in this small measurement range. The original steering wheel with all functions, including airbag and capacitive hands-off detection, is retained. Due to the very compact size and the low weight, the sensor has a low mass inertia torque. In addition, it operates with particularly low friction. All this ensures that the mounted steering sensor has hardly any influence on the steering system of the production vehicle. The steering behavior thus remains equivalent to that of the production vehicle.

Misuse test for steering systems

In a misuse test, the behavior of a vehicle or a vehicle component is examined in extreme situations - as is the case with steering systems. A test is the sliding along an obstacle with corresponding steering torque and permanent steering angle, for example on a curb.
The CLSx steering sensor can be used to precisely examine the maximum steering torques that can occur. For safety reasons (protection of the test driver), the CLSx steering sensor has a high breaking strength of over 500 Nm.

Comfort measurements

Comfort and handling behavior are tested in continuous operation under realistic driving conditions. An important component is the measurement of steering vibrations in the x, y and z directions. With the integrated MEMS acceleration sensor, the CLSx steering effort sensor measures vibrations in all three spatial axes up to 5 g. In addition, the rotational acceleration up to ±10,000 °/s2 is also measured.

Usability

Thanks to the universal adapter system, the CLSx steering effort sensor can be used to investigate the steering behavior of almost all steering systems in vehicle construction and mechanical engineering sectors:

 

  • Passenger cars and trucks
  • Agricultural machinery (tractors, harvesters)
  • Road construction machines and special vehicles
  • Shipbuilding, watercraft, aviation
  • Test benches for steering systems

Technical Data - CLSx

Steering torque

ParameterValueRemarks
Measuring principletemperature compensated strain gauge application
Measurement range±100 Nm others upon request
Accuracy0.1% FSCombined (gain error and non-linearity)
Bandwidth0 to 800 Hzsampling rate 5 kHz

Steering angle

ParameterValueRemarks
Measuring principleincremental angle encoder
Measurement range±1440 °
Accuracy0.045 °
Bandwidth0 to 800 Hzsampling rate 5 kHz

Steering velocity (angular velocity)

ParameterValueRemarks
Measuring principlecalculated from angle
Measurement range±2048 °/s
Bandwidth0 to 800 Hzsampling rate 5 kHz

Vibration and acceleration

ParameterValueRemarks
Vibrationin the center of the steering column, measurement range up to 5 g in x, y and z direction
Rotational accelerationmeasurement range ±10000 °/s2

General data

ParameterValueRemarks
Sensor heightapprox. 30 mmwithout adapter
Sensor weightapprox. 0.6 kgwithout adapter
Overload>100% of the measurement range
Mech. breaking torque>500 Nm
Adaptionspecial adaption sets for any car or truck manufacturer available

Moment of inertia
Sensor

Steering wheel or column adapter


approx. 3000 g cm2

typ. approx. 500 g cm2
Working temperature-20°C to +80°C

Control unit

ParameterValueRemarks
Supply9 to 36 V DC
CAN outputfreely configurable
Analog outputfreely configurable, max. ±10 V
Auto zerowith push-button for torque and angle at
the panel or by remote control
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