Using a Magnetic Encoder in an Anti-Lock Braking Application
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This document is part of a comprehensive tutorial on industrial Digital I/O and Counter/Timer hardware. Learn about National Instruments product offerings for digital and timing I/O, the Industrial Feature Set including watchdog timers and isolation, complementary devices like relays, solenoids and encoders, concepts like sinking and sourcing, and see how these devices can be used in your industrial application.
For more information return to the Complete Industrial Digital I/O and Counter/Timer Tutorial
Using a Magnetic Encoder in an Anti-Lock Braking Application
Automotive standards and expectations continue to rise resulting in more importance being placed on the testing of all critical systems of an automobile. One of the key systems of any vehicle is the anti-locking braking system (ABS) that must be go through extensive tests to assure the safety of the passengers. The reliability of the ABS is determined by the ability to quickly and repeatedly control the speed of a vehicle. The goal of ABS tests is to accurately acquire and analyze data about the speed of the car and the timing of the brakes.
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An ABS test system includes encoders that transmit the angular information about the car’s axes in the form of a digital square wave. This signal can then be passed into a PC based test and measurement system to determine the direction and speed of rotation. The MDFK-08 magnetic encoder by Baumer Electric Ltd. provides a non-contact sensor that operates in industrial environments with voltages up to 30 VDC.
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The features of the NI 6624 allow it to be used in a wide range of high voltage automotive applications and tests. The NI 6624 has hardware triggering capabilities that can be used to synchronize the encoder measurements with other events in the test, such as the application of the brakes.
Creating a program to measure a quadrature encoder is simple in NI-DAQmx. The NI-DAQmx Assistants can quickly generate code to acquire the basic encoder signals. The code provides a stable measurement and test system that can be deployed quickly on the test floor, or vehicle.
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NI 6624
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