Cylinder judging device for internal combustion engine

A cylinder discriminating apparatus for an internal combustion engine provided in a multiple cylinder type internal combustion engine provided with a plurality of cylinders having one combustion stroke per two turns of a crankshaft and entering the combustion stroke in sequence at equal intervals, comprising:

• injection control means for controlling the actuation of a fuel injection valve provided in each of said cylinders;
• rotational variation detecting means for detecting the rotational variation of said internal combustion engine;
• identifying means for generating a signal for identifying the particular cylinder of said internal combustion engine;
• cylinder discriminating means for discriminating the stroke phase of a cylinder in said internal combustion engine in accordance with the output of said identifying means and said rotational variation detecting means;
• said identifying means being configured as a sensing member which is provided on a rotating output shaft of said internal combustion engine and generates a signal corresponding to each cylinder or each cylinder group with a 360.degree. different stroke phase of said internal combustion engine and an identification signal for identifying the single particular cylinder or the two particular cylinders with a 360.degree. different stroke phase in synchronization with the rotation of said rotating output shaft;
• fuel cut judging means for determining a fuel cut zone in vehicle deceleration where fuel injection is cut by said injection control means;
• and
• rotational variation imparting means for giving a rotational variation to said internal combustion engine by controlling the operation of said injection control means when said fuel cut zone is detected by said fuel cut judging means;
• said rotational variation imparting means actuating said fuel injection valve for said single particular cylinder or said particular cylinder and a cylinder entering the combustion stroke continuously with this particular cylinder to inject fuel when said internal combustion engine has odd-numbered cylinders, and
• actuating said fuel injection valve for either one of the two particular cylinders with 360.degree. different stroke phase or either one of said two particular cylinders and a cylinder entering the combustion stroke continuously with this cylinder to inject fuel when said internal combustion engine has even-numbered cylinders.

A cylinder discriminating apparatus for an internal combustion engine provided in a multiple cylinder type internal combustion engine provided with a plurality of cylinders having one combustion stroke per two turns of a crankshaft and entering the combustion stroke in sequence at equal intervals, comprising:

• cranking detecting means for detecting the cranking state of said internal combustion engine;
• injection control means for controlling the actuation of a fuel injection valve provided in each of said cylinders;
• rotational variation detecting means for detecting the rotational variation of said internal combustion engine;
• identifying means for generating a signal for identifying a particular cylinder of said internal combustion engine;
• cylinder discriminating means for discriminating the stroke phase of a cylinder in said internal combustion engine in accordance with the output of said identifying means and said rotational variation detecting means;
• said identifying means being configured as a sensing member which is provided on a rotating output shaft of said internal combustion engine and generates a signal corresponding to each cylinder or each cylinder group having a 360.degree. different stroke phase of said internal combustion engine and an identification signal for identifying a single particular cylinder or two particular cylinders having a 360.degree. different stroke phase in synchronization with the rotation of said output rotating shaft;
• fuel cut judging means for judging a fuel cut zone in vehicle deceleration where fuel injection is cut by said injection control means;
• first rotational variation imparting means for producing a rotational variation to said internal combustion engine by controlling the operation of said injection control means when the cranking of said internal combustion engine is detected by said cranking detecting means;
• and
• second rotational variation imparting means for providing a rotational variation to said internal combustion engine by controlling the operation of said injection control means when said fuel cut zone is detected by said fuel cut judging means;
• said first rotational variation imparting means stopping the operation of said fuel injection valve for said single particular cylinder or said particular cylinder together with a cylinder entering the combustion stroke continuously with this particular cylinder, or making the fuel injection amount from said fuel injection valve to these cylinders different from the fuel injection amount from said fuel injection valve to other cylinders when said internal combustion engine has odd-numbered cylinders, and
• stopping the operation of said fuel injection valve for either one of the two particular cylinders having a 360.degree. different stroke phase or either one of said two particular cylinders together with a cylinder entering the combustion stroke continuously with this cylinder, or making the fuel injection amount from said fuel injection valve to these cylinders different from the fuel injection amount from said fuel injection valve to other cylinders when said internal combustion engine has even-numbered cylinders;
• said second rotational variation imparting means actuating said fuel injection valve for said single particular cylinder or said particular cylinder and a cylinder entering the combustion stroke continuously with this particular cylinder to inject fuel when said internal combustion engine has odd-numbered cylinders, and
• actuating said fuel injection valve for either one of the two particular cylinders having a 360.degree. different stroke phase or either one of said two particular cylinders together with a cylinder entering the combustion stroke continuously with this cylinder to inject fuel when said internal combustion engine has even-numbered cylinders;
• said injection control means having means for controlling the fuel injection for each cylinder on the basis of the cylinder discrimination result determined by the operation of said first rotational variation imparting means during the time from when said internal combustion engine is started to when the cylinder discrimination result is determined by the operation of said second rotational variation imparting means, and controlling the fuel injection for each cylinder on the basis of the cylinder discrimination result determined by the operation of said second rotational variation imparting means after the cylinder discrimination result is determined by the operation of said second rotational variation imparting means.

A cylinder discriminating apparatus for an internal combustion engine provided in a multiple cylinder type internal combustion engine provided with a plurality of cylinders having one combustion stroke per two turns of a crankshaft and entering the combustion stroke in sequence at equal intervals, comprising:

• steady running state detecting means for detecting the steady running state of said internal combustion engine;
• injection control means for controlling the actuation of a fuel injection valve provided in each of said cylinders;
• rotational variation detecting means for detecting the rotational variation of said internal combustion engine;
• identifying means for generating a signal for identifying a particular cylinder of said internal combustion engine;
• cylinder discriminating means for discriminating the stroke phase of said cylinder in said internal combustion engine in accordance with the output of said identifying means and said rotational variation detecting means;
• said identifying means being configured as a sensing member which is provided on an rotating output shaft of said internal combustion engine and generates a signal corresponding to each cylinder or each cylinder group having a 360.degree. different stroke phase of said internal combustion engine and an identification signal for identifying a single particular cylinder or two particular cylinders having said 360.degree. different stroke phase in synchronization with the rotation of said output rotating shaft;
• and
• rotational variation imparting means for producing a rotational variation to said internal combustion engine by controlling the operation of said injection control means when the steady running state of said internal combustion engine is detected by said steady running state detecting means;
• said rotational variation imparting means stopping the operation of said fuel injection valve for said single particular cylinder or said particular cylinder together with a cylinder entering the combustion stroke continuously with said particular cylinder, or making the fuel injection amount from said fuel injection valve to these cylinders different from the fuel injection amount from said fuel injection valve to other cylinders when said internal combustion engine has odd-numbered cylinders, and
• stopping the operation of said fuel injection valve for either one of said two particular cylinders having a 360.degree. different stroke phase or either one of said two particular cylinders together with a cylinder entering the combustion stroke continuously with this cylinder, or making the fuel injection amount from said fuel injection valve to these cylinders different from the fuel injection amount from said fuel injection valve to other cylinders when said internal combustion engine has even-numbered cylinders;
• and
• controlled variable regulating means for regulating a controlled variable relating to the rotational speed of said internal combustion engine to keep said rotational speed at a predetermined speed or higher before said rotational variation imparting means is operated.