Electronic control unit for two-cycle internal combustion engine with exhaust control valve

An electronic control unit for a two-cycle internal combustion engine with an exhaust control valve, comprising:

• an injector for supplying fuel to the internal combustion engine with the exhaust control valve whose opening is changed to adjust exhaust timing;
• injection amount determination means for determining an injection amount determining variable, which determines the injection amount of fuel injected from said injector, for various control conditions;
• injector driving means for driving said injector so as to inject fuel of the injection amount determined by the injection amount determining variable determined by said injection amount determination means;
• ignition timing determination means for determining the ignition timing of said internal combustion engine for various control conditions;
• and
• ignition device driving means for driving an ignition device which ignites said internal combustion engine and performing igniting operation when the ignition timing determined by said ignition timing determination means is detected,
• wherein said electronic control unit further comprises a valve opening sensor for detecting an opening degree of said exhaust control valve;
• injection amount determining variable arithmetical operation map storage means which stores a plurality of injection amount determining variable arithmetical operation maps prepared for different values of the opening degree of said exhaust control valve;
• and valve abnormality detection means for detecting abnormality of operation of said exhaust control valve, and
• said injection amount determination means is comprised so that, when the abnormality of said exhaust control valve is not detected by said valve abnormality detection means, the injection amount determining variable arithmetical operation map selected according to the opening degree of said exhaust control valve detected by said valve opening sensor is used to arithmetically operate said injection amount determining variable, and when the abnormality of said exhaust control valve is detected, of the maps stored in said injection amount determining variable arithmetical operation map storage means, the injection amount determining variable arithmetical operation map in which the injection amount of arithmetically operated fuel is at the maximum is used to arithmetically operate said injection amount determining variable.

An electronic control unit for a two-cycle internal combustion engine with an exhaust control valve, comprising:

• an injector for supplying fuel to the internal combustion engine with the exhaust control valve whose opening is changed to adjust exhaust timing;
• injection amount determination means for determining an injection amount determining variable, which determines the injection amount of fuel injected from said injector, for various control conditions;
• injector driving means for driving said injector so as to inject fuel of the injection amount determined by the injection amount determining variable determined by said injection amount determination means;
• ignition timing determination means for determining the ignition timing of said internal combustion engine for various control conditions;
• and
• ignition device driving means for driving an ignition device which ignites said internal combustion engine and performing igniting operation when the ignition timing determined by said ignition timing determination means is detected,
• wherein said electronic control unit further comprises a valve opening sensor for detecting an opening degree of said exhaust control valve;
• injection amount determining variable arithmetical operation map storage means which stores a plurality of injection amount determining variable arithmetical operation maps for normal state which are prepared for different values of the opening degree of said exhaust control valve and an injection amount determining variable arithmetical operation map for abnormal state which is used when the operation of said exhaust control map is abnormal;
• and valve abnormality detection means for detecting the abnormality of operation of said exhaust control valve, and
• said injection amount determination means is comprised so that, when the abnormality of said exhaust control valve is not detected by said valve abnormality detection means, the injection amount determining variable arithmetical operation map for the normal state selected according to the opening degree of said exhaust control valve detected by said valve opening sensor is used to arithmetically operate said injection amount determining variable, and when the abnormality of said exhaust control valve is detected, of the maps stored in said injection amount determining variable arithmetical operation map storage means, the injection amount determining variable arithmetical operation map for the abnormal state is used to arithmetically operate said injection amount determining variable.

An electronic control unit for a two-cycle internal combustion engine with an exhaust control valve, comprising:

• an injector for supplying fuel to the internal combustion engine with the exhaust control valve whose opening is changed to adjust exhaust timing;
• injection amount determination means for determining an injection amount determining variable, which determines the injection amount of fuel injected from said injector, for various control conditions;
• injector driving means for driving said injector so as to inject fuel of the injection amount determined by the injection amount determining variable determined by said injection amount determination means;
• ignition timing determination means for determining the ignition timing of said internal combustion engine for various control conditions;
• and
• ignition device driving means for driving an ignition device which ignites said internal combustion engine and performing igniting operation when the ignition timing determined by said ignition timing determination means is detected,
• wherein said electronic control unit further comprises a valve opening sensor for detecting an opening degree of said exhaust control valve;
• injection amount determining variable arithmetical operation map storage means which stores a plurality of injection amount determining variable arithmetical operation maps prepared for different values of the opening degree of said exhaust control valve;
• valve abnormality detection means for detecting the abnormality of operation of said exhaust control valve;
• injection amount determining variable correction data arithmetical operation means for arithmetically operating injection amount determining variable correction data, which is used to correct the injection amount determining variable determined by said injection amount determination means to the increase side when the operation of said exhaust control valve is abnormal, for various control conditions;
• and injection amount correction means for correcting the injection amount determining variable determined by said injection amount determination means so that said injection amount takes an increased value by using the injection amount determining variable correction data arithmetically operated by said injection amount determining variable correction data arithmetical operation means when the abnormality of said exhaust control valve is detected by said valve abnormality detection means, and
• said injection amount determination means is comprised so as to arithmetically operate said injection amount determining variable by using the injection amount determining variable arithmetical operation map selected according to the opening degree of said exhaust control valve detected by said valve opening sensor.

An electronic control unit for a two-cycle internal combustion engine with an exhaust control valve, comprising:

• a throttle sensor for detecting an opening degree of a throttle valve of the two-cycle internal combustion engine with the exhaust control valve whose opening is changed to adjust exhaust timing;
• injection amount determination means for determining an injection amount determining variable so as to obtain an air-fuel mixture with a predetermined air-fuel ratio for the intake air amount to a cylinder of said internal combustion engine estimated from the opening degree of said throttle valve detected by said throttle sensor and from the rotational speed of said internal combustion engine;
• injector driving means for driving an injector so as to inject fuel of the injection amount determined by the injection amount determining variable determined by said injection amount determination means;
• ignition timing determination means for determining ignition timing of said internal combustion engine for various control conditions;
• ignition device driving means for driving an ignition device which ignites said internal combustion engine and performing igniting operation when the ignition timing determined by said ignition timing determination means is detected;
• wherein said electronic control unit further comprises valve abnormality detection means for detecting abnormality of the operation of said exhaust control valve when it is detected that the rotational speed of said internal combustion engine is lower than a set value despite the fact that it is detected for more than set time by said throttle sensor that said throttle valve is in a fully-opened state, and
• said injection amount determination means is comprised so that, when said valve abnormality detection means detects the abnormality of the operation of said exhaust control valve, said injection amount is increased to a value higher than the value determined by said control condition at the normal state.

An electronic control unit for a two-cycle internal combustion engine with an exhaust control valve, comprising:

• a throttle sensor for detecting an opening degree of a throttle valve of the two-cycle internal combustion engine with the exhaust control valve whose opening is changed to adjust exhaust timing;
• injection amount determination means for determining an injection amount determining variable so as to obtain an air-fuel mixture with a predetermined air-fuel ratio for the intake air amount to a cylinder of said internal combustion engine estimated from the opening degree of said throttle valve detected by said throttle sensor and from the rotational speed of said internal combustion engine;
• injector driving means for driving an injector so as to inject fuel of the injection amount determined by the injection amount determining variable determined by said injection amount determination means;
• ignition timing determination means for determining ignition timing of said internal combustion engine for various control conditions;
• and
• ignition device driving means for driving an ignition device which ignites said internal combustion engine and performing igniting operation when the ignition timing determined by said ignition timing determination means is detected,
• wherein said electronic control unit further comprises valve abnormality detection means for detecting abnormality of the operation of said exhaust control valve when it is detected that the rotational speed of said internal combustion engine is lower than a set value despite the fact that it is detected for more than set time by said throttle sensor that said throttle valve is in a fully-opened state, and
• said injection amount determination means is comprised so that, when said valve abnormality detection means detects the abnormality of the operation of said exhaust control valve, said injection amount is increased to a value higher than the value determined by said control condition at the normal state within a range not exceeding the maximum value that said injection amount can take for said control condition at the normal state.

An electronic control unit for a two-cycle internal combustion engine with an exhaust control valve, comprising:

• a throttle sensor for detecting an opening degree of a throttle valve of the two-cycle internal combustion engine with the exhaust control valve whose opening is changed to adjust exhaust timing;
• an intake pressure sensor for detecting intake pipe pressure of said internal combustion engine;
• an atmospheric pressure sensor for detecting atmospheric pressure;
• injection amount determination means for arithmetically operating an injection amount determining variable so as to obtain an air-fuel mixture with a predetermined air-fuel ratio for an intake air amount to a cylinder of said internal combustion engine estimated from the intake pipe pressure detected by said intake pressure sensor, the opening degree of said throttle valve detected by said throttle sensor, and the rotational speed of said internal combustion engine;
• injector driving means for driving an injector so as to inject fuel of the injection amount determined by the injection amount determining variable determined by said injection amount determination means;
• ignition timing determination means for determining ignition timing of said internal combustion engine for various control conditions;
• and
• ignition device driving means for driving an ignition device which ignites said internal combustion engine and performing igniting operation when the ignition timing determined by said ignition timing determination means is detected,
• wherein said electronic control unit further comprises valve abnormality detection means for detecting abnormality of the operation of said exhaust control valve when it is detected that the rotational speed of said internal combustion engine cannot exceed a set value despite the fact that it is detected that a difference between the atmospheric pressure detected by said atmospheric pressure sensor and the intake pipe pressure detected by said intake air sensor is not larger than a set value, and
• said injection amount determination means is comprised so that, when said valve abnormality detection means detects the abnormality of the operation of said exhaust control valve, said injection amount is increased to a value higher than the value determined by said control condition at the normal state.

An electronic control unit for a two-cycle internal combustion engine with an exhaust control valve, comprising:

• a throttle sensor for detecting an opening degree of a throttle valve of the two-cycle internal combustion engine with the exhaust control valve whose opening is changed to adjust exhaust timing;
• an intake pressure sensor for detecting intake pipe pressure of said internal combustion engine;
• an atmospheric pressure sensor for detecting atmospheric pressure;
• injection amount determination means for arithmetically operating an injection amount determining variable so as to obtain an air-fuel mixture with a predetermined air-fuel ratio for an intake air amount to a cylinder of said internal combustion engine estimated from the intake pipe pressure detected by said intake pressure sensor, the opening degree of said throttle valve detected by said throttle sensor, and the rotational speed of said internal combustion engine;
• injector driving means for driving an injector so as to inject fuel of the injection amount determined by the injection amount determining variable determined by said injection amount determination means;
• ignition timing determination means for determining ignition timing of said internal combustion engine for various control conditions;
• and
• ignition device driving means for driving an ignition device which ignites said internal combustion engine and performing igniting operation when the ignition timing determined by said ignition timing determination means is detected,
• wherein said electronic control unit further comprises valve abnormality detection means for detecting abnormality of operation of said exhaust control valve when it is detected that the rotational speed of said internal combustion engine cannot exceed a set value despite the fact that it is detected that a difference between the atmospheric pressure detected by said atmospheric pressure sensor and the intake pipe pressure detected by said intake air sensor is not larger than a set value, and
• said injection amount determination means is comprised so that, when said valve abnormality detection means detects abnormality of the operation of said exhaust control valve, said injection amount is increased to a value higher than the value determined by said control condition at the normal state within a range not exceeding the maximum value that said injection amount can take for said control condition at the normal state.