Rotary magnet quotient measurement mechanism for motor vehicle engine - contains magnetic coils acted on by pulse width modulated signals dependent on physical measurement parameter

摘要

The rotary magnet quotient measurement mechanism contains two mutually perpendicularly oriented magnetic coils (1,2) which produce a resultant magnetic field for a rotary magnetic indicator. The coils are acted upon by a variable control signal dependent on the measurement parameter. The first coil receives a control signal varying with the parameter and the second receives a control signal equal to the difference between the first control signal and a signal complementary to it. The control signals are pulse width modulated signals with frequency significantly higher than the indicator natural frequency. USE/ADVANTAGE - For indicating a physical parameter, esp. tank contents or coolant temp. in ic engine. Simplified drive arrangement.