Failure memory device

• US 4,910,678 A
• Filed: 03/30/1988
• Issued: 03/20/1990
• Est. Priority Date: 03/31/1987
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Maekawa, Hirotoshi, Hirano, Shigeaki, Tatemoto, Minoru, Kubozono, Tsutomu
• Primary Examiner(s): Chin, Gary
• Application Number:
  US07/175,298
• Time in Patent Office: 720 Days
• Field of Search: 364/424.03, 364/424.01, 364/424.04, 340/551, 340/52 R, 340/52 F, 340/438, 371/18, 371/17, 371/21, 371/11, 73/489, 73/490, 73/491, 73/117.3
• US Class Current: 701/35
• CPC Class Codes: B60G 17/0185 for failure detection
• CPC Class Codes: B60G 2600/08 Failure or malfunction detecting means
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: G07C 5/0808 Diagnosing performance data testing of vehicles G01M17/00; testing of electrical installation on vehicles G01R31/005
• CPC Class Codes: G07C 5/085 using electronic data carriers
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A failure hysteresis memory device which is constructed with a vehicle-side connector to be connected to a plurality of electronic control devices mounted on the vehicle; a tester-side connector to be connected to a trouble-diagnosis multi-function tester or a display device; signal conversion device for converting a signal from the vehicle-side connector to produce an output signal to the tester-side connector; a memory unit to store therein the output signal converted by the signal conversion means; and a micro-computer which processes information contained in the input signal and controls the constituent members.

Claims

1. device for recording vehicular failures which comprises:

a vehicle-side connector to be connected to a plurality of electronic control devices which are mounted in a vehicle wherein said connector has a plurality of pins which can send and receive a plurality of signals;

a tester-side connector, to be connected to a trouble-diagnosis multi-function tester or a display device and which has a plurality of pins which can send and receive signals;

signal conversion means which converts analog signals received from said pins in said vehicle-side connector to produce a digital output signal on said pins in said tester-side connector;

a memory unit to store therein the output signal converted by said signal conversion means;

a micro-computer which processes information contained in a signal produced by said vehicle-side connector and which controls said signal conversion means and said memory means; and

a multiplexer controlled by said micro-computer for selecting a given signal from the plurality of signals produced on the pins of said vehicle-side connector and for dynamically reconfiguring the connections between said vehicle-side connector and said tester-side connector.

2. A device according to claim 1, further comprising:

a plurality of vehicle-side connectors are provided and wherein each of said connectors has a plurality of pins the same in number as the pins as that of said electronic control devices.

3. A device according to claim 2, further comprising:

a plurality of multiplexers; and

wherein a selection signal is produced from the micro-computer to select an appropriate one of said multiplexers.

4. A device according to claim 3, wherein a signal passing through said selected multiplexer is converted to a serial signal and stored in said memory device.