Sampling measurement data generation apparatus
First Claim
1. A sampling measurement data generation apparatus comprising:
- means for generating a continuous analog signal which represents a physical state of a moving object to be measured;
an encoder mechanically coupled to said moving object so as to move in synchronism with the moving object;
means for generating sampling signals having a period corresponding to movement of said encoder;
means for generating a measurement start signal and a measurement end signal for presetting a measurement range corresponding to movement of said encoder;
means for sampling said continuous analog signal using said generated sampling signals;
means for generating clock signals;
means for counting the number of said clock signals which appear between each of adjacent two of said sampling signals generated by said sampling signals generation means;
means for converting said sampled analog signal into digitial signals; and
means for storing said digital signals;
whereby the sampling period is determined by the output of said means for counting with said number of said clock signals being related to said digital data stored in said storing means.
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Abstract
Sampling pulses are obtained by a plurality of sampling through holes which are formed at equal angular intervals in a disc encoder which is fixed to a crankshaft of a piston engine to be measured. An analog output from a pressure sensor for sensing the pressure inside a cylinder is sampled, held by the obtained sampling pulses and converted into a digital signal to provide digital measurement data. The digital measurement data is written into a RAM during a positive period of an internal clock pulse under the control of a direct memory access control circuit and the RAM is accessed by a CPU during a negative period of the internal clock pulse. The digital data read out of the RAM is undergone for the data arithmetic operation by the CPU in the realtime manner.
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Citations
4 Claims
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1. A sampling measurement data generation apparatus comprising:
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means for generating a continuous analog signal which represents a physical state of a moving object to be measured; an encoder mechanically coupled to said moving object so as to move in synchronism with the moving object; means for generating sampling signals having a period corresponding to movement of said encoder; means for generating a measurement start signal and a measurement end signal for presetting a measurement range corresponding to movement of said encoder; means for sampling said continuous analog signal using said generated sampling signals; means for generating clock signals; means for counting the number of said clock signals which appear between each of adjacent two of said sampling signals generated by said sampling signals generation means; means for converting said sampled analog signal into digitial signals; and means for storing said digital signals; whereby the sampling period is determined by the output of said means for counting with said number of said clock signals being related to said digital data stored in said storing means. - View Dependent Claims (2, 3, 4)
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Specification