Fuel injection control apparatus for internal combustion engine
First Claim
1. A fuel injection control apparatus for an internal combustion engine comprising:
- a fuel injection valve for injecting fuel into an internal combustion engine;
an electromagnetic actuator for opening and closing said fuel injection valve;
a current supply means for supplying current to said electromagnetic actuator;
a sensor means for detecting a driving condition of said internal combustion engine;
a control means for controlling said electromagnetic actuator through said current supply means in response to an output of said sensor means, so as to adjust fuel injection amount injected through said fuel injection valve in accordance with the driving condition of the internal combustion engine;
said control means comprising a pilot injection means for activating said electromagnetic actuator during a predetermined pilot injection period (TP) so as to cause said fuel injection valve to perform a pilot injection, an injection interrupt means for deactivating said electromagnetic actuator during a predetermined injection interrupt period (TI) so as to interrupt fuel injection after said pilot injection period (TP), and a main injection means for activating said electromagnetic actuator during a predetermined main injection period (TM) after said injection interrupt period (TI) so as to cause said fuel injection valve to perform a main injection; and
an adjusting means for adjusting at least one of a timing and a length of at least either of said pilot injection period (TP), injection interrupt period (TI), and main injection period (TM) in response to the output of said sensor means, so that main fuel injection can be adjusted in accordance with a residual magnetic flux remaining in said electromagnetic actuator at an initiating timing of said main injection period.
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Accused Products
Abstract
A pilot injection amount QP, a main injection amount QM, and a lag TDF between the main and pilot injections are obtained (S130). The pilot injection initiating timing TTP, the pilot injection period TP, the main injection initiating timing TTM, and the main injection period TM are obtained on the basis of the pilot injection amount QP, the main injection amount QM, the fundamental injection initiating timing KT and the common rail pressure Pc (S150). The main injection period correction amount ΔTQM and the injection initiating timing correction shift amount ΔT are then obtained on the basis of the pilot injection period TP and the time lag TDF (S160). Finally, modified by these correction amount ΔTQM and the shift amount ΔT, the pilot injection initiating timing TTP'"'"', the main injection initiating timing TTM'"'"' and the main injection period TM'"'"' are obtained as final values (S170). With this arrangement, a fuel injection control apparatus for an internal combustion engine becomes capable of reducing adverse affects of residual magnetic flux and the pressure pulsation in the fuel injection initiating timing of the main injection, thereby suppressing smoke generation and realizing an optimum fuel injection.
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Citations
20 Claims
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1. A fuel injection control apparatus for an internal combustion engine comprising:
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a fuel injection valve for injecting fuel into an internal combustion engine; an electromagnetic actuator for opening and closing said fuel injection valve; a current supply means for supplying current to said electromagnetic actuator; a sensor means for detecting a driving condition of said internal combustion engine; a control means for controlling said electromagnetic actuator through said current supply means in response to an output of said sensor means, so as to adjust fuel injection amount injected through said fuel injection valve in accordance with the driving condition of the internal combustion engine; said control means comprising a pilot injection means for activating said electromagnetic actuator during a predetermined pilot injection period (TP) so as to cause said fuel injection valve to perform a pilot injection, an injection interrupt means for deactivating said electromagnetic actuator during a predetermined injection interrupt period (TI) so as to interrupt fuel injection after said pilot injection period (TP), and a main injection means for activating said electromagnetic actuator during a predetermined main injection period (TM) after said injection interrupt period (TI) so as to cause said fuel injection valve to perform a main injection; and an adjusting means for adjusting at least one of a timing and a length of at least either of said pilot injection period (TP), injection interrupt period (TI), and main injection period (TM) in response to the output of said sensor means, so that main fuel injection can be adjusted in accordance with a residual magnetic flux remaining in said electromagnetic actuator at an initiating timing of said main injection period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification