Rate detection method and rate detector
AssigneeNissan Motor Co., Ltd.
InventorsTomohiko Takahashi, Yoshiaki Yoshioka, Tetsuya Iwasaki
Life of this patent
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Abstract
A stream of pulses related to rotation rate drives an interrupt to store first timer values of a first timer and to set a second timer to run from zero. At predetermined fixed time intervals, second timer values of the second timer are stored. The stored first timer values are sampled to determine a first rate related to the input stream. The stored second timer values are sampled to determine a second rate. The first and second rates are selectively used as a final rotation rate related to the input stream.
Claims19
A rate detection method, comprising:
- generating interrupts in response to an input stream;
- storing first timer values of a first timer in response to said interrupts;
- setting a second timer to run from zero in response to said interrupts;
- sampling said stored first timer values to determine a first rate related to said input stream;
- sampling second timer value of said second timer to determine a second rate;
- and
- creating a final rate related to said input stream based on said first and second rates.
A rate detection method, comprising:
- generating first interrupts in response to a first input stream;
- generating second interrupts in response to a second input stream;
- storing first timer values in response to said first interrupts;
- storing second timer values in response to said second interrupts;
- executing a first routine, when selected, which includes sampling said stored first timer values to determine a first rate related to said first input stream as a final rotation rate;
- executing a second routine, when selected, which includes sampling said stored second timer values to determine a second rate related to said second input stream as said final rotation rate;
- and
- selecting one of said first and second routines.
A rate detector for a rotation device, comprising:
- a source outputting a stream of pulses related to rotation rate of a rotation device;
- and
- a programmable signal processor with interrupt input coupled to output of said source, said signal processor being programmed to
- store first timer values of a first timer in response to said interrupts;
- set a second timer to run from zero in response to said interrupts;
- sample said stored first timer values to determine a first rate related to said input stream;
- sample second timer value of said second timer to determine a second rate;
- and
- create a final rate related to said input stream based on said first and second rates.
A rate detector for a rotation device, comprising:
- a source outputting a stream of first pulses related to rotation rate of a rotation device;
- a rotation sensor coupled to said rotation device, said rotation sensor outputting a stream of second pulses related to rotation rate of said rotation device;
- a programmable signal processor with first interrupt input coupled to output of said source and also with second interrupt input coupled to output of said rotation sensor, said signal processor being programmed to:
- store first timer values in response to said first interrupts;
- store second timer values in response to said second interrupts;
- execute a first routine, when selected, which includes sampling said stored first timer values to determine a first rate related to said first input stream as a final rotation rate;
- execute a second routine, when selected, which includes sampling said stored second timer values to determine a second rate related to said second input stream as said final rotation rate;
- and
- select one of said first and second routines.
Dependencies are inferred from the claim text.