Data processor in automobiles

• US 4,539,641 A
• Filed: 03/23/1982
• Issued: 09/03/1985
• Est. Priority Date: 03/23/1981
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Kawashimo, Norishige, Nakajima, Joe
• Primary Examiner(s): Krass, Errol A.
• Assistant Examiner(s): Cosimano, Edward R.
• Application Number:
  US06/361,477
• Time in Patent Office: 1,260 Days
• Field of Search: 364/424, 364/550, 364/551, 364/561
• US Class Current: 701/35
• CPC Class Codes: G01D 9/28 Producing one or more recordings, each recording being of the values of two or more different variables G01D9/38, G01D9/40 take precedence
• CPC Class Codes: G07C 5/0816 Indicating performance data, e.g. occurrence of a malfunction
• CPC Class Codes: G07C 5/0825 using optical means

Abstract

A data handling system for an automobile comprises an odometric data generator which provides odometric data corresponding to the travel distance of the automobile. A nonvolatile memory stores total odometric data, an adder receives the odometric data provided from the odometric data generator and the previous total odometric data provided from the nonvolatile memory, and a control circuit controls the writing of data into the nonvolatile memory in accordance with the state of a key switch. The adder receives the present odometric data and the previous odometric data, to thereby provide total odometric data up to the present time. This total odometric data is displayed by an appropriate display device. In response to the turn-off of the key switch, the total odometric data provided from the adder is written into the nonvolatile memory. Thus, an odometer can be implemented in electronic circuit form.

Claims

1. For use in a processor-based control system associated with a vehicle, said vehicle having sensors generating signals representative of prescribed conditions of the vehicle, a data handling system comprising:

an electrically erasable and programmable read only memory;

means, coupled to said electrically erasable and programmable read only memory and said sensors, for generating data indicative of a condition of said vehicle in response to signals generated by said sensors and causing said data to be written into said electrically erasable and programmable read only memory;

a control switch, the operation of which governs the operation of said data handling system, wherein said means for generating data comprises means for causing said data to be written into said memory in response to the turning-off of said control switch;

switching means for controlling the supply of power for said electrically erasable and programmable read only memory; and

control means, coupled to said switch means and responsive to the operation of said control switch, for causing said switching means to supply power to said electrically erasable and programmable read only memory for a prescribed period of time subsequent to the turning-off of said control switch after which prescribed period of time the supply of power to said memory is cut off.

2. A system according to claim 1, wherein said means comprises means, responsive to the turning-on of said control switch, for generating data indicative of a condition of the vehicle on the basis of signals generated by said sensors and data stored in said electrically erasable and programmable read only memory.

3. A system according to claim 1, wherein said sensors include sensor means for generating signals representative of the travel distance of said vehicle and said means includes means for generating data representative of the total travel distance of said vehicle in response to the turning-off of said control switch.

4. A system according to claim 1, wherein said data writing causing means comprises means, responsive to the turning-off of said control switch for causing a portion of said data to be written into those memory addresses the contents of which provided a basis for the generation of said data in response to the turning-on of said control switch.

5. A system according to one of claims 1 and 2, further comprising display means, coupled to said data generation means, for displaying prescribed information in accordance with the data generated by said data generation means.

6. A system according to claim 1, wherein said vehicle includes sensor means generating signals representative of preselected operational conditions of the vehicle and wherein said data handling system further comprises

additional memory;

and

means, coupled to said sensor means, for generating further data representative of said preselected operational conditions of the engine and causing said further data to be written into said additional memory.

7. A system according to claim 6, wherein said further data writing causing means includes means, coupled to said memory, for causing prescribed data stored in said electrically erasable and programmable read only memory to be written into said additional memory.

8. A system according to claim 11, further comprising display means, coupled to said additional memory, for displaying prescribed information in accordance with the data stored therein.

9. A system according to claim 8, wherein said prescribed data is representative of the travel distance of said vehicle.

10. A system according to claim 9, wherein said preselected operational conditions correspond to a condition of fuel remaining in a fuel tank.