Fuel injection control system for internal combustion engine
First Claim
1. A fuel injection control system for an internal combustion engine provided with a fuel injection valve comprising:
- means for detecting the intake manifold pressure of said engine and providing an output signal;
fuel flow arithmetic unit means for calculating a fuel flow amount in accordance with said output signal of said engine;
memory means having an address input coupled to an output of said arithmetic unit means, said memory means storing values of a driving time for corresponding values applied to said address input from said arithmetic unit means; and
means for driving said fuel injection valve with driving times determined in accordance with values outputted from said memory means, said outputted values being used to compensate for the non-linearity of the actual relationship between the driving time of said fuel injection valve and the amount of fuel actually injected;
wherein said values stored in said memory means are determined so that said fuel injection valve is driven with driving times such that a predetermined constant air-to-fuel ratio is maintained; and
wherein said means for driving said fuel injection valve is synchronized in accordance with output pulses produced by engine speed detecting means.
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Abstract
A fuel injection control system for an internal combustion engine in which the amount of fuel injected per input stroke of the engine is precisely controlled so that a predetermined constant air-to-fuel ratio is maintained at all times. A fuel flow arithmetic unit, operating from inputs supplied from a sensor which detects the pressure in the intake manifold of the engine, calculates a fuel flow amount per intake stroke. The output of the fuel flow arithmetic unit is applied as an address input to a memory in which are prestored values of driving times for each value supplied from the fuel flow arithmetic unit. The driving times are calculated taking into account the non-zero opening and closing times of the fuel injection valves, thereby eliminating nonlinearities in the fuel flow amount driving time characteristics. A driving signal generating circuit drives (opens) the fuel injection valves for times indicated by the driving times outputted by the memory.
10 Citations
1 Claim
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1. A fuel injection control system for an internal combustion engine provided with a fuel injection valve comprising:
- means for detecting the intake manifold pressure of said engine and providing an output signal;
fuel flow arithmetic unit means for calculating a fuel flow amount in accordance with said output signal of said engine;
memory means having an address input coupled to an output of said arithmetic unit means, said memory means storing values of a driving time for corresponding values applied to said address input from said arithmetic unit means; and
means for driving said fuel injection valve with driving times determined in accordance with values outputted from said memory means, said outputted values being used to compensate for the non-linearity of the actual relationship between the driving time of said fuel injection valve and the amount of fuel actually injected;wherein said values stored in said memory means are determined so that said fuel injection valve is driven with driving times such that a predetermined constant air-to-fuel ratio is maintained; and wherein said means for driving said fuel injection valve is synchronized in accordance with output pulses produced by engine speed detecting means.
- means for detecting the intake manifold pressure of said engine and providing an output signal;
Specification
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- Resources
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Current AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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Original AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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InventorsKishimoto, Yuuji
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Primary Examiner(s)Chin, Gary
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Application NumberUS06/758,848Time in Patent Office900 DaysField of Search364/431.05, 364/431.12, 123/480, 123/478, 123/486US Class Current701/104CPC Class CodesF02D 41/32 of the low pressure type F0...
