Air-fuel ratio control device and method
A control device, air-fuel ratio technology, applied in engine control, fuel injection control, electrical control, etc., can solve problems such as output performance fluctuations, air-fuel ratio target value fluctuations, etc.
Active Publication Date: 2007-09-19
NISSAN MOTOR CO LTD
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Problems solved by technology
[0003] However, although the device described in Patent Document 1 performs feedback control to the stoichiometric air-fuel ratio, the control switches to feed-forward control in the rich air-fuel ratio range in which the fuel injection amount is made larger than that corresponding to the acceleration The amount of isochronous theoretical air-fuel ratio
This disadvantageously causes large fluctuations relative to the target value of the air-fuel ratio in the rich air-fuel ratio range, which leads to fluctuations in output performance
Method used
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[0029] FIG. 1 is a system diagram of an air-fuel ratio control device for an engine (internal combustion engine).
[0030] Air is sucked into the combustion chamber of each cylinder of the engine 1 from the air filter 2 via the intake passage 3 , the throttle valve 4 and the intake manifold 5 . In each branch portion of the intake manifold 5, a fuel injection valve 6 is provided for each cylinder. However, the fuel injection valve 6 may be arranged to directly face the inside of the fuel chamber.
[0031] The fuel injection valve 6 is an electromagnetic fuel injection valve (injector), which is opened by passing a current to a solenoid and closed by stopping the current. More specifically, the fuel injection valve 6 is opened by turning on a current according to a drive pulse signal from an engine control unit (hereinafter referred to as ECU) 12 described later and injects and supplies fuel supplied by a fuel pump (not shown in the drawing). shown) is delivered under pressur...
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An air-fuel ratio feedback control range is enlarged to improve exhaust purification performance and output stability. In one aspect, an air-fuel ratio control apparatus of an internal combustion engine comprises an air-fuel ratio sensor capable of detecting an air-fuel ratio across both lean and rich ranges with a theoretical air-fuel ratio interposed therebetween. Feedback control is performed so as to bring an actual air-fuel ratio into a target air-fuel ratio at least in a predetermined operational range on the basis of a detected value of the air-fuel ratio sensor. Even in a range where the air-fuel ratio is made richer than the theoretical air-fuel ratio, the target air-fuel ratio is set to be richer, and the air-fuel ratio feedback control may still be executed.
Description
technical field [0001] The present invention relates to an air-fuel ratio control device for an internal combustion engine, and in particular to a device and technique for controlling the air-fuel ratio with high precision over a wide operating range. Background technique [0002] In an internal combustion engine including a purification catalyst in an exhaust passage, feedback control of the air-fuel ratio is performed so as to keep the air-fuel ratio near the theoretical air-fuel ratio at which the purification efficiency of the catalyst is high. Japanese Published Patent Application No. 10-288075 (Patent Document 1) discloses an air-fuel ratio control device that performs high-precision feedback control by using an air-fuel ratio sensor capable of detecting an air-fuel ratio within a wide operating range. [0003] However, although the device described in Patent Document 1 performs feedback control to the stoichiometric air-fuel ratio, the control switches to feed-forward...
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Login to View More IPC IPC(8): F02D41/14
CPCF02D41/1495F02D41/10F02D41/1403F02D41/1475F02D41/1482F02D41/1483
Inventor 中泽智加藤浩志
Owner NISSAN MOTOR CO LTD