Riverside, Calif. − Bourns, Inc. has expanded its non-contacting torque sensor product line with new devices optimized for electric power assisted steering (EPAS) automotive applications. The new models include a torque-only sensor, a torque angle sensor, and a torque index sensor. These non-contacting sensors feature clock spring-free and Hall Effect (HE)-based technology, which allows measurement without the constraints of a connecting cable for the transmission of power and output signals, said Bourns.
The torque-only sensor (TOS) measures the relative shift angle between two rotating shafts linked by a torsion bar. It works by converting the angular data is into a voltage output that is fed to the EPAS electronic control unit (ECU) to determine how much power assistance is required. This sensor is suited for applications where a steering angle sensor is already discretely fitted to the column electronic architecture or mounted below the airbag housing, said Bourns. It's a good fit for applications that need to eliminate a connecting cable from the design.
The torque angle sensor (TAS) collectively measures torque, steering wheel angle and speed with a number of steering wheel turns. The upper portion of the sensor contains components for differential torque measurement, and the lower housing uses a set of satellite gears to measure the rate and number of steering wheel turns. The steering angle sensor output is absolute and offers true power-off capability, said Bourns. This sensor can be used in vehicles that require both torque and steering angle feedback. The TAS sensor design replaces the need to fit two discrete devices.
The Bourns torque index sensor (TIS) features an additional HE switch that functions by counting the number of turns of the steering shaft for comparative analysis with an EPAS motor. A motor position sensor (MPS) obtains the relative value of angles from the steering assist motor. By comparing this information, the TIS sensor can accurately determine the absolute value of the steering angle without the use of a discrete steering angle sensor. The torque index sensor is said to provide a more cost-effective solution when the total EPAS system cost is considered.
Availability: Bourns' Stock Check includes a shopping cart to distributor inventory. The tool can be found on Bourns' website.
Additional information: Here's a link to Bourns' automotive sensors product portfolio.