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: A carburetor 1 with a starting fuel supply mechanism 6 which additionally supplies a starting fuel at the start of an engine includes a choke valve in suction passages 4 and 4 extending through a main body 2; and a starting fuel supply path disposed as a bypass of a main fuel passage to connect a float chamber 3a to the suction passages 4 and 4, the starting fuel supply path being provided with an opening/closing valve opened by interlocking with the closing operation of the choke valve, and a valve body 5 of the choke valve which performs the closing operation presses valve opening/closing means 61 while abutting on one end of the valve opening/closing means 61, to open the opening/closing valve of the starting fuel supply path, so that the starting fuel can be prepared to be supplied.

Abstract: In the carburetor 1A with the acceleration pump of the present embodiment, when a plunger 16 is stopped at the position of a top dead center in a cylinder 10 and the acceleration pump mechanism is not operated as in an idle operation or the like, a gap w having a predetermined width is formed between the tip of a rod 14A and a rod abutment face 16a of the plunger 16, whereby an operational error generated in a link system which transmits the opening/closing operation of a throttle valve to the rod is eliminated through this gap.

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: According to the present invention of the simple structure in which the back pressure chamber of the inner vent type regulator is divided by the inner vent diaphragm and the displacement limitation rod protrudes from the center portion thereof to the center portion of the pressure regulation diaphragm, it is possible to suppress the variation in air-fuel ratio to a minimum both when the air cleaner is blocked and at the time of high load operation, without being accompanied by a rise in costs.

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: To prevent back bleed in a carburetor including a slow fuel passage branched from a main fuel passage, in a carburetor for an engine in which a slow air intake port to introduce air into a slow air bleed passage opens on the side of a suction passage; a slow fuel passage is connected in the middle of a main fuel passage on the upstream side, joins the slow air bleed passage on the downstream side, and has an open end on the side of the suction passage; and the main fuel passage opens in a state where a main nozzle projects in a venturi part of the suction passage, wherein the slow air intake port is opened at a predetermined position of the venturi part having an inner diameter equal to or less than that of the suction passage at a position where the main fuel passage opens.

Abstract: An electronic control unit corresponding to a fuel injection control apparatus measures an interval time in ignition signals input by wirings, detects an erroneous connection of wiring by comparing a combination of the measured interval times with a combination of interval times in the case that the wiring is in a correct connection in the same engine stroke, which is previously stored, corrects a setting in such a manner as to output the fuel injection signal to the same cylinder at the same timing as the case that the wiring is in the correct connection, by detecting the erroneous connection and stores the setting, and thereafter outputs a fuel ignition signal on the basis of the corrected setting.

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: In a method of permitting an electronic control device 10A that is a fuel injection control device constituting a part of a fuel injection system of an engine 1 to generate a fuel injection signal depending on an engine operation state while determining fuel injection timing by an engine rotation signal, and to output the signal to an injector 5, thereby controlling fuel injection of the engine, the electronic control unit 10A continuously detects a supply voltage thereto, and recognizes starting of rotation of the engine 1 when it is detected that a predetermined fluctuation has occurred in the supply voltage at the time of starting or when it is determined that the supply voltage at the time of starting is below a predetermined reference voltage value, and starts fuel injection even before input of the engine rotation signal.

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: A throttle apparatus embedding an electronic control unit in which a circuit board of the electronic control unit is embedded within a throttle body and a connector for connecting to an external portion connected to a terminal provided in the circuit board protrudes from an outer wall of the throttle body in a direction approximately along a terminal side of the circuit board surface from one side line of the circuit board, wherein the circuit board is storable within the throttle body by selecting an optional mounting direction from at least two or more directions having different angles on the same plane around a center portion of the circuit board, and an insertion portion capable of protruding the connector to an external portion through an outer wall of the throttle body is provided at each of corresponding positions of the outer wall.

Abstract: A fuel injection control apparatus for an engine which carried out a fuel injection control according to a speed density system which estimates an intake air amount from detected engine rotational speed value and intake pipe pressure value to decide a fuel injection amount, the control apparatus preventing an air fuel ratio from becoming lean due to clogging of an air cleaner, by calculating an intake pipe pressure differential pressure value between an intake pipe pressure average value and an intake pipe pressure minimum value which are continuously detected, and by correcting the fuel injection amount according to a predetermined procedure while using the differential pressure value of the intake pipe pressure.

Abstract: The present invention provides a throttle apparatus having an electronic control means built-in which uses an engine fuel supply system having a carburetor specification and is arranged for constructing a fuel injection system in accordance with an electronic control.

Abstract: A throttle apparatus embedding an electronic control unit in which a circuit board of the electronic control unit is embedded within a throttle body and a connector for connecting to an external portion connected to a terminal provided in the circuit board protrudes from an outer wall of the throttle body in a direction approximately along a terminal side of the circuit board surface from one side line of the circuit board, wherein the circuit board is storable within the throttle body by selecting an optional mounting direction from at least two or more directions having different angles on the same plane around a center portion of the circuit board, and an insertion portion capable of protruding the connector to an external portion through an outer wall of the throttle body is provided at each of corresponding positions of the outer wall.

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: A method and an apparatus detect an erroneous connection between a plurality of ignition devices and a fuel injection control device. A first time interval is measured from an input of an ignition signal for a certain cylinder to an input of the next ignition signal and a second time interval from an input of the next ignition signal to an input of a further next ignition signal. An erroneous connection is determined by comparing a relationship between the first time interval and the second time interval with a previously stored normal relationship between the first time interval and the second time interval that are correctly connected in accordance with a predetermined procedure. The erroneous connection is outputted and displayed to a predetermined erroneous connection display device if it is determined that the erroneous connection exists.