Resolver signal processing system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHideshi Ohya
Life of this patent
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Abstract
The disclosed system generates resolver reference signal on the basis of the clock of CPU 202. The CPU 202 generates resolver output signal sampling and servo control loop trigger signals in synchronization with its own clock. Thus, the synchronization between the reference signal and the sampling is assured. Because the sampling is constantly performed at a fixed phase point of the reference signal, the sampling accuracy is improved, while stable servo control loop response is obtained because the sampling is also synchronous with servo control loop so that the sampling will not interrupt the servo control loop.
Claims20
A resolver signal processing system that supplies a reference signal to a resolver and processes output signals from said resolver which are produced by modulating the amplitude of said reference signal, dependent on the angle of rotation of a rotator, comprising:
- reference signal generating means for generating said reference signal that cycles in a given period on the basis of a clock;
- sampling trigger signal generating means to generate a sampling trigger signal, which cycles in a given period on the basis of the period of said reference signal, in synchronization with said clock;
- detection means to sample said output signals from said resolver in response to said sampling trigger signal and detect sine and cosine modulated signals in accordance with said angle of rotation from said output signals;
- and
- angle of rotation determining means to determine said angle of rotation, based on said sine and cosine modulated signals.
An apparatus that determines an angle of rotation of a rotator, comprising:
- a reference signal generator that generates a periodic reference signal for output to a resolver;
- a sample trigger signal generator that generates sample trigger signals based on an output of the reference signal generator, the sample trigger signal is synchronous with respect to the periodic reference signal;
- a signal sampler, the signal sampler sampling one or more resolver output signals based on the sample trigger signal to obtain magnitudes of the resolver output signals at a specific phase of the resolver output signals;
- and
- a processor that generates the angle of rotation of the rotator based on the magnitudes.
Dependencies are inferred from the claim text.