Abstract: The invention provides a control device for mutually monitoring two microcomputers at a low cost while reducing a parts number and doubly monitoring abnormality in each of the microcomputers. The control device transmits a reset signal to a main microcomputer and resets the main microcomputer when a frequency of a first pulse signal deviates from a normal frequency range determined by a frequency calculating means, in which the first pulse signal is output from the main microcomputer, and the frequency calculating means calculates a frequency of the first pulse signal by an input of the first pulse signal to a sub microcomputer. The control device transmits a reset signal to the sub microcomputer and resets the sub microcomputer when a frequency of a second pulse signal deflects from a normal frequency range, by an input of the second pulse signal to the main microcomputer from the sub microcomputer.

Abstract: When control to maintain a constant engine rotation number is executed, the electronic control unit constantly monitors an error of detected throttle position data with respect to a desired throttle control value, executes a first stage of a failure judgment method to judge that a failure of a throttle control system has occurred in a case where an absolute value of the error exceeds a predetermined threshold value continuously for a predetermined time or longer, and executes a second stage of the failure judgment method to judge that a serious failure has occurred in the system in a case where a detected engine rotation number exceeds a predetermined rotation number continuously for a predetermined time or longer, to perform predetermined operations in accordance with the judgment results.

Abstract: The invention provides a control device for mutually monitoring two microcomputers at a low cost while reducing a parts number and doubly monitoring abnormality in each of the microcomputers. The control device transmits a reset signal to a main microcomputer and resets the main microcomputer when a frequency of a first pulse signal deviates from a normal frequency range determined by a frequency calculating means, in which the first pulse signal is output from the main microcomputer, and the frequency calculating means calculates a frequency of the first pulse signal by an input of the first pulse signal to a sub microcomputer. The control device transmits a reset signal to the sub microcomputer and resets the sub microcomputer when a frequency of a second pulse signal deflects from a normal frequency range, by an input of the second pulse signal to the main microcomputer from the sub microcomputer.

Abstract: An air-fuel ratio control device comprising a fuel supply unit, engine operation state detector, air-fuel ratio information detector, and an electronic control unit is disclosed. The electronic control unit determines a fuel injection amount which realizes a target air-fuel ratio while using engine load information by the engine operation state detector on the basis of air-fuel ratio information by the air-fuel ratio information detector, and then outputs a driving signal to the fuel supply unit, to execute feedback control mainly at an excessively rich side air-fuel ratio, characterized in that the air-fuel ratio information detector is an exhaust gas temperature sensor.

Abstract: The invention aims at providing an engine control experimenting apparatus which enables to easily carry out a confirmation test of an operation in all operation states with regard to the performance of various engine control parts constituting an engine system. In this engine control experimenting apparatus, various engine control parts, which are actually mounted on an engine and are required for engine control, are constructed in a state where electrical transmission and fuel supply are enabled in a manner similar to a case where the engine control parts are mounted on a real engine, and a model-based control is performed on the same conditions as those of the actual engine, on the basis of experimental data of the real engine written in an electronic control unit constituting each of the engine control parts.

Abstract: When control to maintain a constant engine rotation number is executed, the electronic control unit constantly monitors an error of detected throttle position data with respect to a desired throttle control value, executes a first stage of a failure judgment method to judge that a failure of a throttle control system has occurred in a case where an absolute value of the error exceeds a predetermined threshold value continuously for a predetermined time or longer, and executes a second stage of the failure judgment method to judge that a serious failure has occurred in the system in a case where a detected engine rotation number exceeds a predetermined rotation number continuously for a predetermined time or longer, to perform predetermined operations in accordance with the judgment results.

Abstract: There is provided an air-fuel ratio control device comprising: fuel supply means; engine operation state detection means; air-fuel ratio information detection means; and an electronic control unit, the electronic control unit being configured to determine a fuel injection amount which realizes a target air-fuel ratio while using engine load information by the engine operation state detection means on the basis of air-fuel ratio information by the air-fuel ratio information detection means, and then output a driving signal to the fuel supply means, to execute feedback control mainly at an excessively rich side air-fuel ratio, characterized in that the air-fuel ratio information detection means is an exhaust gas temperature sensor, and while estimating an air-fuel ratio at this time on the basis of detected exhaust gas temperature information by a predetermined obtaining method, the air-fuel ratio is used for the control.

Abstract: Various engine control parts, which are actually attached to the engine and are necessary for engine control, are constructed in a state where electrical transmission and fuel supply are enabled in a manner similar to a case where the engine control parts are mounted on an actual engine, and model-based control is performed using numerical formulas on the same conditions as those of the actual engine on the basis of test data of the actual engine written in an electronic control unit constituting one of the engine control parts.

Abstract: In a fuel injection control method of an engine which an intake air flow rate is estimated by a predetermined calculating method, using data on detected intake pipe pressure and engine rotating speed, a fuel injection time is determined by a predetermined calculating method, using the intake air flow rate, and a deviation from a target engine rotating speed, and an injector driving signal is outputted by a fuel injection control device, the fuel injection time is obtained by adding a battery voltage fluctuation correction time, and a transient correction injection time which corrects a deviation from the target engine rotating speed, which is obtained by a predetermined calculating method, to a basic injection time obtained by a predetermined calculating method.

Abstract: An engine revolution number is controlled by operating opening and closing of a throttle valve by an engine revolution number control means on the basis of a deviation between a detected engine revolution number and a target engine revolution number, and air-fuel ratio control means applies the engine revolution number and the intake air flow rate to a predetermined numerical formula which is derived from a plurality of sets of data groups including the intake air flow rate and air-fuel ratio, which are obtained from a predetermined experiment model, and expresses the relationship between each data, to thereby calculate a fuel injection time for realizing a target air fuel ratio. A target air fuel ratio is thus realized while minimizing any delay of a response even during a transient operation, and thus, good engine operability is always acquired.

Abstract: The invention aims at providing an engine control experimenting apparatus which enables to easily carry out a confirmation test of an operation in all operation states with regard to the performance of various engine control parts constituting an engine system. In this engine control experimenting apparatus, various engine control parts, which are actually mounted on an engine and are required for engine control, are constructed in a state where electrical transmission and fuel supply are enabled in a manner similar to a case where the engine control parts are mounted on a real engine, and a model-based control is performed on the same conditions as those of the actual engine, on the basis of experimental data of the real engine written in an electronic control unit constituting each of the engine control parts.

Abstract: The problem to be solved by the present invention is to make it possible to scientifically test the performance of various engine control parts constituting a control system of an engine in various operation states when being mounted on an engine. Various engine control parts, which are actually attached to the engine and are necessary for engine control, are constructed in a state where electrical transmission and fuel supply are enabled in a manner similar to a case where the engine control parts are mounted on an actual engine, and model-based control is performed using numerical formulas on the same conditions as those of the actual engine on the basis of test data of the actual engine written in an electronic control unit constituting one of the engine control parts.

Abstract: In a fuel injection control method of an engine which an intake air flow rate is estimated by a predetermined calculating method, using data on detected intake pipe pressure and engine rotating speed, a fuel injection time is determined by a predetermined calculating method, using the intake air flow rate, and a deviation from a target engine rotating speed, and an injector driving signal is outputted by a fuel injection control device, the fuel injection time is obtained by adding a battery voltage fluctuation correction time, and a transient correction injection time which corrects a deviation from the target engine rotating speed, which is obtained by a predetermined calculating method, to a basic injection time obtained by a predetermined calculating method.

Abstract: An engine revolution number is controlled by operating opening and closing of a throttle valve by an engine revolution number control means on the basis of a deviation between a detected engine revolution number and a target engine revolution number, and air-fuel ratio control means applies the engine revolution number and the intake air flow rate to a predetermined numerical formula which is derived from a plurality of sets of data groups including the intake air flow rate and air-fuel ratio, which are obtained from a predetermined experiment model, and expresses the relationship between each data, to thereby calculate a fuel injection time for realizing a target air fuel ratio. A target air fuel ratio is thus realized while minimizing any delay of a response even during a transient operation, and thus, good engine operability is always acquired.

Abstract: The invention achieves a good engine speed control without increasing a cost and a lowering a reliability of an apparatus in a general purpose engine. In a rotating speed control apparatus of an engine in which an electronic control unit (10) controls an engine speed by operating so as to open and close a throttle valve (40) by an electronic governor apparatus (4) on the basis of an engine speed detected by a crank angle sensor (7) corresponding to an engine speed detecting means and regulating an intake air amount, the opening and closing operation of the throttle valve (40) in the electronic governor apparatus (4) is carried out by a rotating force of a motor rotationally driven only in one direction and an elastic repulsive force of a return spring energizing in a reverse direction.

Abstract: The invention can avoid an energy dissipation and a consumption of an apparatus by minimizing a driving amount of a fuel pump and maintain an improved fuel supply state, in a fuel supply system injecting a liquefied gas fuel by an injector and supplying to an engine.

Abstract: In a fuel supply apparatus of a returnless type engine provided with fuel supply pipe lines (5, 6) extended from a fuel tank (2) and having an injector (8) in a leading end side, a fuel pump (3) having an electric motor (31) arranged in the fuel supply pipe line, and an electronic control unit (10) in which a fuel supply control program for controlling so as drive the electric motor (31) and the injector (8) is installed, a pressure sensor (11) detecting a fuel pressure so as to output to the electronic control unit (10) is arranged at a predetermined position of the fuel supply pipe line (6) in a downstream side of the fuel pump (3), and the electronic control unit (10) continuously calculates a minimum driving amount of the electric motor (31) necessary for maintaining a target fuel injection pressure on the basis of the fuel pressure value continuously detected by the electronic control unit (10) so as to command, thereby feedback controlling the operation of the fuel pump (3) and maintaining a fuel inject

Abstract: The invention can avoid an energy dissipation and a consumption of an apparatus by minimizing a driving amount of a fuel pump and maintain an improved fuel supply state, in a fuel supply system injecting a liquefied gas fuel by an injector and supplying to an engine.