Feature Sensors & sensing systems
wheel position. Such systems include actuators that provide force feedback to give the feel of conventional steer- ing and also include additional fail-safe safety factors. With such large volume potential, elaborate customisation of sensor com- ponents is almost always included – such as integrated connectors, return springs and mounting plates. For the throttle by wire application, a separate pedal position module and throttle valve module is supplied to a major manufacturer as a one-piece solution, complete with built-in redundant sensors.
Autosports Variohm EuroSensor also works closely with the autosports industry where many sensor concepts have a potential technology transfer to high volume automotive applications. One current project is for a sequential gearbox position indicator for track racing and Raleigh cars, that would be suitable to apply to four-wheel drive transfer cases for range selection and high resolution clutch positions that are used to calculate and modulate the front-rear torque split.
In the past a potentiometric angle sensor was mounted on the outside of the gearbox casing and required
a shaft extension from the gearbox selection mechanism to drive the sensor shaft through a coupling. The new design uses Novotechnik's Touchless technology in the form of an encapsulated magnet that is mounted on the rotating gearbox shaft inside the aluminium gearbox casing, and a separate Hall detector clamped to the outer surface of the gearbox. With the Hall Effect sensor able to operate through the 8mm gearbox wall, this system removes the need to extend and seal the gearbox barrel shaft outside of the casing, resulting in an improved solution with less
Compact and low cost rotary sensors with integrated connector and return spring. Easy mounting and adjustment via robust mounting plates
parts, lighter weight, reduced space and higher efficiency.
Variohm EuroSensor T: 01327 351004
www.variohm.com
Enter 214 Inclinometers for a boring application T
233 gravity-referenced servo inclinometers from Sherborne Sensors are being used in ZED Tunnel Guidance’s Tunnel Boring Machines (TBMs), where precision, reliability and robustness are essential. These inclinometers have a torque balance system which, explains the company, is rugged enough to withstand
the severe shock and vibration experienced in the most hostile of environments, while maintaining optimum levels of accuracy. In addition, the electronics and dual-axis sensors are encased within a compact sealed housing, permitting operation in tough environments and enabling measurement of angular tilt in reference to gravity. Commenting on the selection, Mick Lowe, senior project engineer at Zed Tunnel Guidance, said: “Having evaluated a number of inclinometer products, we found that none were as technically sound or as accurate as Sherborne Sensors’ T233.” Mike Baker, managing director of Sherborne Sensors, added: “By employing the T233 series, ZED Tunnel Guidance has been able to consolidate its hardware into a single target unit, enabling the supply of smaller, simpler, and more cost-effective tunnel guidance systems.” Sherborne Sensors
www.sherbornesensors.com
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