Analog-to-digital conversion system for an electronic control system of a motor vehicle
First Claim
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1. An analog-to-digital conversion system for obtaining digital values for an electronic control system of a motor vehicle having various sensors to detect operating conditions of said motor vehicle and to produce analog signals comprising:
- input determining means for generating a select signal to select one of a plurality of channels corresponding to one of said sensors and operating conditions;
converting means responsive to said analog signals and said select signal for converting the analog signal corresponding to said one sensor and operating condition into digital signals at a predetermined timing;
changeover means responsive to said digital signals for storing said digital signals as digital values art respective addresses;
calculating means responsive to said digital values for calculating a difference between a present said digital value at a present time and an old digital value obtained at a previous time and for producing a difference signal;
comparing means responsive to said difference signal for effectively comparing said present digital value with said old digital value in order to select a smallest difference value and for producing a corresponding signal; and
retrieving means responsive to said corresponding signal for retrieving as a newly obtained digital value the digital value corresponding to said smallest difference value stored in said respective address, whereby influence of noise in said newly obtained digital value have been eliminated without delay.
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Abstract
An analog/digital converter for converting analog output signals to digital values. The difference between the converted digital value and a reference digital value obtained at the last routine of the program is calculated. In accordance with the difference the closer digital value to the reference value is selected and the closer digital value is set as a proper digital value.
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Citations
5 Claims
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1. An analog-to-digital conversion system for obtaining digital values for an electronic control system of a motor vehicle having various sensors to detect operating conditions of said motor vehicle and to produce analog signals comprising:
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input determining means for generating a select signal to select one of a plurality of channels corresponding to one of said sensors and operating conditions; converting means responsive to said analog signals and said select signal for converting the analog signal corresponding to said one sensor and operating condition into digital signals at a predetermined timing; changeover means responsive to said digital signals for storing said digital signals as digital values art respective addresses; calculating means responsive to said digital values for calculating a difference between a present said digital value at a present time and an old digital value obtained at a previous time and for producing a difference signal; comparing means responsive to said difference signal for effectively comparing said present digital value with said old digital value in order to select a smallest difference value and for producing a corresponding signal; and retrieving means responsive to said corresponding signal for retrieving as a newly obtained digital value the digital value corresponding to said smallest difference value stored in said respective address, whereby influence of noise in said newly obtained digital value have been eliminated without delay. - View Dependent Claims (2, 3, 4)
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5. An analog-to-digital conversion method for obtaining digital values for an electronic control system of a motor vehicle having various sensors to detect operating conditions of said motor vehicle and to produce analog signals, comprising the steps of:
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selecting one of channels corresponding to one of said sensors and operating conditions; generating a select signal corresponding to said one channel; converting said analog signal corresponding to said select signal and said one sensor and operating condition into digital signals at a predetermined timing; storing said digital signals as digital values at respective addresses; calculating a difference between a present of said digital values at a present time and an old digital value obtained at a previous time; comparing said present digital value with said old digital value in order to select a smallest difference value; and retrieving as a newly obtained digital value the digital value corresponding to said smallest difference value stored in said respective address, whereby influences of noise in said newly obtained digital value have been eliminated without delay.
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Specification