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01/06/2006
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When electromechanical braking (EMB) systems finally arrive – perhaps as 14V systems – sensors will be needed to measure the braking force applied to each wheel, writes Roger Bishop.
Sensata Technologies, formerly the Sensors and Controls Division of Texas Instruments, has designed a such a force sensor using proprietary microfused silicon strain gauge (MSG) technology which is successfully employed in pressure sensors currently used in braking, stability and fuel injection systems.
The MSG technology consists of silicon MEMS strain gauge elements, glass-bonded to a stainless steel body which is deformed under the action of pressure or force. The force sensor uses a line-contact system to minimise hysteresis and friction.
To fulfil the high accuracy expectations – 1% full scale error within an operating force range up to 30kN – and to minimise the influence of non-uniformly applied forces, a combination of four gauge elements has been chosen. The output of the strain gauges is interpreted by dedicated signal-conditioning with self-diagnostic capabilities. The resulting signal is analogue and ratiometric to the force and operating voltage.
The sensor is 35mm in diameter and meets industry temperature requirements (–40°C to 150°C) with high reliability, good EMC performance and low cost. It has been integrated into a Continental Teves EMB system where it has proven its functionality and reliability during extensive testing.
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Author
Roger Bishop
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