Fuel injection diagnostic control device
First Claim
1. A diagnostic/control device for a fuel injected internal combustion engine, the device comprising a control system including means for electrical connection directly to at least one fuel injector of the engine and to an engine management computer normally connected thereto, the control system further including means for receiving a reference signal directly from the engine management computer and to modify the signal and, after modification of the signal, transmit the modified signal to said at least one fuel injector.
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Accused Products
Abstract
A diagnostic/control device for fuel injected internal combustion engines comprising a control system (14) connectable via leads (16) to the fuel injectors (10) after disconnection therefrom of an engine management computer (11), the latter being connected directly (at 18) to the control system (14). An oxygen sensor (13) is connected (at 17) to the control system (14) whereby the latter is connected between the engine management computer (11) and the fuel injectors (10) and can be operated in closed circuit or open circuit mode to control the injectors directly when required independently of the engine management computer (11).
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Citations
20 Claims
- 1. A diagnostic/control device for a fuel injected internal combustion engine, the device comprising a control system including means for electrical connection directly to at least one fuel injector of the engine and to an engine management computer normally connected thereto, the control system further including means for receiving a reference signal directly from the engine management computer and to modify the signal and, after modification of the signal, transmit the modified signal to said at least one fuel injector.
- 18. A method of testing a fuel injected internal combustion engine having an engine management computer, comprising the steps of providing a device including a control system, electrically connecting the control system directly to at least one fuel injector of an engine in place of an engine management computer normally connected thereto, connecting the control system also to the engine management computer, and modifying a signal therefrom to cause the control system to actuate said at least one injector according to the modified signal.
Specification