초록 ▼

To permit continued operation of a vehicle in spite of malfunction of an electronic ignition computer system, or any other electronic control module in an automotive vehicle, a transducer (10) provides an output to a trigger stage which has its output connected a digitally operating microprocessor (

To permit continued operation of a vehicle in spite of malfunction of an electronic ignition computer system, or any other electronic control module in an automotive vehicle, a transducer (10) provides an output to a trigger stage which has its output connected a digitally operating microprocessor (17) and to a bypass or transfer switch (21). The output from the microprocessor is connected to an analog and operating output stage (19, 20) to be controlled by the digital system of the microprocessor (17). Upon sensing of low operating voltage (U) as determined, for example, by a threshold switch (22), or of starting condition the switch (21) is closed, bypassing or interrupting connection to the microprocessor, and directly connecting signals from the transducer output stage to the input of the ignition circuit to permit operation under emergency conditions. The analog portion of the system is a single integrated module, separate from the digitally operating microprocessor (17) for ease of error diagnosis, maintenance and repair. This is particularly important with digitally operating control systems (17) which are subject to malfunction under low voltage conditions or upon occurrence of stray or distrubance signals in the network, for example under starting conditions.

대표청구항 ▼

Electronic engine control system for an internal combustion engine (E) with emergency operation mode having means (N) providing an operating voltage (U) of varying low-voltage levels; a transducer (10) coupled to the engine (E) and providing engine speed signals; a trigger circuit (15) coupled to th

Electronic engine control system for an internal combustion engine (E) with emergency operation mode having means (N) providing an operating voltage (U) of varying low-voltage levels; a transducer (10) coupled to the engine (E) and providing engine speed signals; a trigger circuit (15) coupled to the transducers, receiving the engine speed signals and providing trigger signals; a digitally operating signal processing stage (17) receiving (a) operating voltage (U) from said voltage providing means (N), and (b) the trigger signals, and providing digitally processed output control signals; coupling circuit means (19) receiving said processed output control signals and providing engine operating signals; engine operation elements (20) coupled to the engine operating signals for controlling operation of the engine (E), said trigger circuit and said coupling circuit means forming at least part of an analog portion of the system in which the signals occurring therein are processed in analog mode, and said digital signal processing stage forming a digital portion of the system in which the signals occurring therein are processed in digital mode; voltage level sensing means (22) coupled to the operating voltage providing means (N) and providing operating voltage level signals representative of, respectively, operating voltage above or below a predetermined level, and thus indicating either “adequate voltage”or “low voltage”conditions; and switch means (21, 21′) controlled by said operating voltage level signals and connecting the trigger signals to the coupling circuit means (19) and bypassing said digitally operating signal processing stage (17) when said operating voltage sensing means senses an operating voltage below a predetermined level and provides a corresponding “low voltage condition”signal, said voltage level sensing means and said switch means forming part of said analog portion of the system.