Data gathering system for automotive vehicles
First Claim
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1. A system comprising:
- (a) at least one sensor for providing an analog sensor voltage signal related to an engine operating condition;
(b) a first reference voltage source for providing a first predetermined voltage indicative of a first reference value;
(c) a second reference voltage source for providing a second predetermined voltage lower than said first predetermined voltage;
(d) an A/D converter for converting an input analog voltage to a digital value, said A/D converter having an input for receiving said input analog voltage and including a capacitor having first and second terminals, said first terminal being connected to said A/D converter input, and control means for placing said capacitor in a charging mode to permit said capacitor to charge in response to said input analog voltage for a predetermined time period, applying a third predetermined voltage to said capacitor second terminal at the termination of said capacitor charging mode, placing said capacitor in a discharging mode to discharge the same at a constant rate until the voltage at said capacitor first terminal falls to a predetermined value after the termination of said capacitor charging mode, and resetting said capacitor to its initial state;
(e) a multiplexor having data channels for connecting said first and second reference voltage sources and said sensor to said A/D converter input, respectively; and
(f) a digital computer for sequentially selecting said multiplexor data channels in a desired order for sequentially coupling said first and second reference voltage sources and said sensor to said A/D converter input, said digital computer storing a digital value corresponding to said first reference value and receiving from said A/D converter and storing digital values for said sensor voltage and said first and second predetermined voltages, and calculating a corrected digital value corresponding to the sensor voltage from said stored digital values.
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Abstract
A data gathering system is disclosed for use with an automotive vehicle. The system includes an A/D converter for converting an input analog value into a corresponding digital value, a multiplexor having a number of data channels for transferring vehicle operation variable indicative analog values to the A/D converter when rendered conductive, and a digital computer for selectively rendering the data channel conductive in a predetermined sequence. The digital computer is adapted to correct the converted values according to supply voltage variations and store the corrected values therein.
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Citations
3 Claims
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1. A system comprising:
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(a) at least one sensor for providing an analog sensor voltage signal related to an engine operating condition; (b) a first reference voltage source for providing a first predetermined voltage indicative of a first reference value; (c) a second reference voltage source for providing a second predetermined voltage lower than said first predetermined voltage; (d) an A/D converter for converting an input analog voltage to a digital value, said A/D converter having an input for receiving said input analog voltage and including a capacitor having first and second terminals, said first terminal being connected to said A/D converter input, and control means for placing said capacitor in a charging mode to permit said capacitor to charge in response to said input analog voltage for a predetermined time period, applying a third predetermined voltage to said capacitor second terminal at the termination of said capacitor charging mode, placing said capacitor in a discharging mode to discharge the same at a constant rate until the voltage at said capacitor first terminal falls to a predetermined value after the termination of said capacitor charging mode, and resetting said capacitor to its initial state; (e) a multiplexor having data channels for connecting said first and second reference voltage sources and said sensor to said A/D converter input, respectively; and (f) a digital computer for sequentially selecting said multiplexor data channels in a desired order for sequentially coupling said first and second reference voltage sources and said sensor to said A/D converter input, said digital computer storing a digital value corresponding to said first reference value and receiving from said A/D converter and storing digital values for said sensor voltage and said first and second predetermined voltages, and calculating a corrected digital value corresponding to the sensor voltage from said stored digital values. - View Dependent Claims (2, 3)
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Specification