Input/output signal checker for an electronic control unit in an

Details Input/output signal checker for an electronic control unit in an Input/output signal checker for an electronic control unit in an

1987-09-03

1988-07-12

Levy, Stewart J.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

G01M 1500

Patent

active

047561866

ABSTRACT:
A checker for checking a plurality of input signals including signals representing operation parameters of a multi-cylinder internal combustion engine, the input signals being supplied to an electronic control unit for electronically controlling the operation of the engine, and a plurality of output signals outputted from the electronic control unit in response to the input signals. The checker has displays which display the respective input signals and output signals in respective modes. A display hold circuit is connected with a display to have a received signal in the display continuously over a desired time period. A frequency divider circuit is connected with an operation sequence display for displaying operation sequence of fuel injection valves and divides the frequency of the signal representing the operation sequence in a predetermined ratio and then delivers the frequency divided signal to the operation sequence display.

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