A method and an apparatus for protecting an engine are disclosed which are capable of preventing damage to the engine or associated parts thereof. The engine is provided with an electronic control fuel injection system. A quasi-abnormality of at least one of variables in connection with the engine a
A method and an apparatus for protecting an engine are disclosed which are capable of preventing damage to the engine or associated parts thereof. The engine is provided with an electronic control fuel injection system. A quasi-abnormality of at least one of variables in connection with the engine and the associated parts thereof, such as an engine cooling water, a fuel pressure or the like is detected by a sensor. When the quasi-abnormality of the variable and such a quasi-abnormal state lasts for a predetermined period of time, a throttle opening of an electronic control throttle is regulated so as to limit an engine rotational speed to a low rate.
대표청구항▼
What is claimed is: 1. A method of protecting an engine which is provided with an electronic control fuel injection system, comprising the steps of: detecting a quasi-abnormality of at least one of variables in connection with the engine and parts associated with the engine; when the quasi-abnormal
What is claimed is: 1. A method of protecting an engine which is provided with an electronic control fuel injection system, comprising the steps of: detecting a quasi-abnormality of at least one of variables in connection with the engine and parts associated with the engine; when the quasi-abnormality of the at least one of the variables is detected and lasts for a predetermined period of time, regulating a throttle opening of an electronic control throttle, to thereby limit an engine rotational speed to a low rate, wherein, the at least one of the variables is a temperature of an engine cooling water, the quasi-abnormality thereof is a state that the temperature of the engine cooling water is not less than a predetermined temperature; and freeing the regulation of the throttle opening of the electronic control throttle when an abnormality of cooling water has been avoided, so that a control mode is changed over to a fuel injection control using the electronic control fuel injection system. 2. A method of protecting an engine which is provided with an electronic control fuel injection system, comprising the steps of: detecting a quasi-abnormality of at least one of variables in connection with the engine and parts associated with the engine; and when the quasi-abnormality of the at least one of the variables is detected and lasts for a predetermined period of time regulating a throttle opening of an electronic control throttle to thereby limit an engine rotational speed to a low rate; wherein the at least one of the variables is a fuel pressure, and the quasi-abnormality thereof is a state that the fuel pressure is equal to or less than a predetermined pressure. 3. A method of protecting an engine from overheating, which engine is provided with an electronic control fuel injection system, comprising the steps of: detecting a temperature of an engine cooling water and judging whether or not the detected temperature is equal to or higher than a predetermined temperature; and when the detected temperature is equal to or higher than the predetermined temperature and such a high temperature state lasts for a predetermined period of time regulating a throttle opening of an electronic control throttle, to thereby limit an engine rotational speed to a predetermined low rate; wherein the method further comprises the step of freeing the regulation of the throttle opening of the electronic control throttle when an abnormality of the temperature of the engine cooling water has been avoided, so that a control mode is changed over to fuel injection control using the electronic control fuel injection system. 4. A method of protecting an engine at a low fuel pressure, in which engine a fuel injector is disposed in an air intake passage on an upstream side of a collector portion of an intake manifold of the engine so that a petroleum gas fuel is supplied to a plurality of cylinders of the engine by fuel injection from the fuel injector, and an electronic control throttle is disposed in the air intake passage, comprising the steps of: receiving information in regard to an engine rotational speed, a fuel pressure, a throttle opening, and an angle of an accelerator pedal by means of an engine control unit; and when the fuel pressure becomes equal to or less than a predetermined pressure, regulating a throttle opening of the electronic control throttle, to thereby limit the engine rotational speed to a low rate. 5. An engine power control method for a cargo handling vehicle including an engine which is provided with an electronic control throttle so as to regulate a throttle opening of the electronic control throttle, to thereby restrain a maximum speed of the vehicle, the method comprising the steps of: detecting a speed of the vehicle; determining, based on the detected speed of the vehicle, whether the vehicle is in a cargo handling state, wherein it is determined that the vehicle is in the cargo handling state when the detected speed of the vehicle is at zero; and releasing the regulation of the throttle opening of the electronic control throttle when it has been determined that the cargo handling vehicle is in the cargo handling state, to thereby maximize a shaft torque of the engine. 6. A protecting apparatus for an engine at a low fuel pressure, in which engine a fuel injector is disposed in an air intake passage on an upstream side of a collector portion of an intake manifold of the engine so that a petroleum gas fuel is supplied to a plurality of cylinders of the engine by fuel injection from the fuel injector, and an electronic control throttle is disposed in the air intake passage, the apparatus comprising: an engine speed detecting means for detecting an engine rotational speed; a pressure sensor for detecting a pressure of the petroleum gas fuel supplied to the fuel injector; a throttle position sensor for detecting a throttle opening of the electronic control throttle; an accelerator pedal angle sensor disposed on an accelerator pedal of the engine; and an engine control unit connected to the engine speed detecting means, pressure sensor, throttle position sensor and accelerator pedal angle sensor, for receiving information in regard to the engine rotational speed, the fuel pressure, the throttle opening, and the angle of the accelerator pedal; wherein when the fuel pressure detected by the pressure sensor becomes equal to or less than a predetermined pressure, the engine control unit regulates the throttle opening of the electronic control throttle, to thereby limit the engine rotational speed to a low rate. 7. An apparatus for protecting an engine from overheating, comprising: an electronic control fuel injection system including an electronic control throttle; a detecting means for detecting a temperature of an engine cooling water; a judgment means for judging whether or not the temperature detected by the detecting means is equal to or higher than a predetermined temperature and such a high temperature state lasts for a predetermined period of time, to thereby determine a condition for commencing restriction of an engine rotational speed; a throttle opening control means for regulating a throttle opening of the electronic control throttle so as to make an actual rotational speed of the engine reach an overheat preventing rotational speed when the condition for commencing the restriction of the engine rotational speed is established; and a changing means for releasing the throttle opening control means from the regulation of the throttle opening of the electronic control throttle and changing over a control mode to fuel injection control using the electronic control fuel injection system when an abnormality of the temperature of the engine cooling water has been avoided by the throttle opening control means in such a manner that the throttle opening is regulated to reduce a flow rate of an intake airflow and decrease the engine rotational speed to the overheat preventing rotational speed. 8. The apparatus as defined in claim 7, further comprising an engine rotational speed detecting means for detecting an actual rotational speed of the engine; wherein the throttle opening control means is adapted to regulate the throttle opening of the electronic control throttle in such a manner that the overheat preventing rotational speed is set to a target rotational speed to which the actual rotational speed of the engine detected by the engine rotational speed detecting means is set. 9. An engine power control apparatus for a cargo handling vehicle including an engine which is provided with an electronic control throttle so as to regulate a throttle opening of the electronic control throttle, to thereby restrain a maximum speed of the vehicle, the apparatus comprising: a speed detecting means for detecting a speed of the vehicle; and a determining means for determining, based on an output of the speed detecting means, whether the vehicle is in a cargo handling state, wherein the determining means determines that the vehicle is in the cargo handling state when the output of the speed detecting means indicates the speed of the vehicle is at zero, wherein when the determining means determines that the cargo handling vehicle is in the cargo handling state, the regulation of the throttle opening of the electronic control throttle is released so as to maximize a shaft torque of the engine. 10. The engine power control apparatus as defined in claim 9, further comprising: a maximum speed control means for controlling the throttle opening of the electronic control throttle to restrain the maximum speed of the vehicle; and a changing and controlling means for releasing the maximum speed control means from restraining of the maximum speed of the vehicle when the determining means determines that the cargo handling vehicle is in the cargo handling state, so that the regulation of the throttle opening of the electronic control throttle is released.
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이 특허에 인용된 특허 (5)
Kanno,Isao, Engine control system for outboard motor.
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