Abstract: An injection valve injects a given amount of fuel into an engine in response to an injection pulse. An ECU inputs the injection pulse corresponding to an amount of injected fuel. The ECU inputs information on an amount of injected fuel corresponding to the number of injection pulses to a display controlling portion through a communication line. The ECU produces the information on the amount of injected fuel composed of digital data whenever a given number of injection pulses corresponds to the given amount of fuel. The display controlling portion decides that the given amount of fuel is injected from the injection valve when a predetermined number of pieces of digital data are properly received. The display controlling portion calculates an instantaneous fuel consumption based on an amount of injected fuel thus decided and an operating distance to cause a meter to display information on the instantaneous fuel consumption.

Abstract: A vehicle anti-theft device (60) is configured from: a box-like case body (132) having on the bottom (161) a hole (173) through which air comes in and goes out; a movement display member (170) of which the center is arranged along the perpendicular line extending from the center of the hole (173), and which is secured to the ceiling (162) of the case body by means of a tool (176) inserted from the hole (173) and transmits the movement, state to the outside of the case body (132); and a substrate (67) which is built into the case body (132) and on which electronic components for actuating the movement display member (170) are mounted.

Abstract: A waterproof structure for an electronic device (60) includes: a case (130) which is disposed in a location in a vehicle (10) distant from a receiving antenna (61), which houses a processing unit (69) that processes location information, and which has a wiring hole (171) through which a wire (62) passes; a cylindrical part (172) which extends in the axial direction of the wire from the case in such a manner as to surround the wiring hole; a seal member (167) which is housed in a compressed state in the cylindrical part, and surrounds the wire; and a cap (160) which is attached to the case in an attachable/detachable manner, has a hole (168) through which the wire passes, and prevents the seal member from moving.

Abstract: A vehicle anti-theft device (60) contains: a case body (132); a lid member (156) for closing the opening (167) of the case body; a substrate (67) which is inserted in a removable manner into the case body (132) from the opening thereof and on which electronic components are mounted; a sub-battery (88) for supplying power to the substrate (67); and a sealing member (157) which is fitted into the opening (167) of the case body and has a substrate pressing part (203) for preventing the substrate from being extracted and a sub-battery pressing part (204) for preventing the sub-battery (88) from being extracted.

Abstract: A waterproof structure for an electronic device (60) includes: a case (130) which is disposed in a location in a vehicle (10) distant from a receiving antenna (61), which houses a processing unit (69) that processes location information, and which has a wiring hole (171) through which a wire (62) passes; a cylindrical part (172) which extends in the axial direction of the wire from the case in such a manner as to surround the wiring hole; a seal member (167) which is housed in a compressed state in the cylindrical part, and surrounds the wire; and a cap (160) which is attached to the case in an attachable/detachable manner, has a hole (168) through which the wire passes, and prevents the seal member from moving.

Abstract: A vehicle anti-theft device (60) contains: a case body (132); a lid member (156) for closing the opening (167) of the case body; a substrate (67) which is inserted in a removable manner into the case body (132) from the opening thereof and on which electronic components are mounted; a sub-battery (88) for supplying power to the substrate (67); and a sealing member (157) which is fitted into the opening (187) of the case body and has a substrate pressing part (203) for preventing the substrate from being extracted and a sub-battery pressing part (204) for preventing the sub-battery (88) from being extracted.

Abstract: A vehicle anti-theft device (60) is configured from: a box-like case body (132) having on the bottom (161) a hole (173) through which air comes in and goes out; a movement display member (170) of which the center is arranged along the perpendicular line extending from the center of the hole (173), and which is secured to the ceiling (162) of the case body by means of a tool (176) inserted from the hole (173) and transmits the movement, state to the outside of the case body (132); and a substrate (67) which is built into the case body (132) and on which electronic components for actuating the movement display member (170) are mounted.

Abstract: An injection valve injects a given amount of fuel into an engine in response to an injection pulse. An ECU inputs the injection pulse corresponding to an amount of injected fuel. The ECU inputs information on an amount of injected fuel corresponding to the number of injection pulses to a display controlling portion through a communication line. The ECU produces the information on the amount of injected fuel composed of digital data whenever a given number of injection pulses corresponds to the given amount of fuel. The display controlling portion decides that the given amount of fuel is injected from the injection valve when a predetermined number of pieces of digital data are properly received. The display controlling portion calculates an instantaneous fuel consumption based on an amount of injected fuel thus decided and an operating distance to cause a meter to display information on the instantaneous fuel consumption.

Abstract: A control unit is provided for increasing the number of engine revolutions per minute to a predetermined number of revolutions per minute when the throttle is closed and when the engine has been rotated for more than a prescribed time period at more than a prescribed number of revolutions per minute, and the throttle has been opened for more than a prescribed time period at more than a prescribed opening. The control unit increases the number of engine revolutions per minute to a predetermined number of revolutions per minute irrespective of the throttle and maintains the same for a predetermined retention time when the steering handle is turned to the left or the right by more than a prescribed angle. The time to start controlling the number of engine revolutions per minute may be delayed by providing a delay time for delaying the time to start controlling the engine revolutions. The number of engine revolutions per minute may be controlled after the hull is underwater.

Abstract: A rotation-angular-position detecting apparatus of a rotor is capable of confirming an angular position of a rotation of the rotor within a relatively short period of time following a start of the rotation. The rotation-angular-position detecting apparatus includes a second rotor which rotates in a rotation interlocked with a first rotor with a plurality of first detection members formed at equal intervals in a rotational direction of the first rotor at a predetermined speed ratio with respect to the first rotor, and has a plurality of second detection members formed at unequal intervals in a rotational direction of the second rotor. A second pickup is provided for generating a second detection signal when sensing the proximity of any one of the second detection members on the second rotor.

Abstract: A totally closed value of the throttle valve of an engine having a fast idle function will be rendered capable of being correctly detected. The opening indicated value IACV to be supplied to the motor during a fast idle operation is a value obtained by adding the water temperature correction value and the atmospheric pressure correction value to the totally closed reference value. A value obtained by subtracting the water temperature correction value and the atmospheric pressure correction value from the actual opening to be detected by the throttle sensor is set to the totally closed value. When the value obtained by subtracting the water temperature correction value and the atmospheric pressure correction value from the actual opening goes out of the dead zone, the totally closed value is replaced with the value obtained by subtracting both correction values from the actual opening.

Abstract: To allow an engine having an intake duct for drawing running air to produce a high output by performing appropriate fuel injection depending on dynamic pressure variations. A vehicle speed corrective coefficient calculator calculates a fuel corrective coefficient KVPLS based on a vehicle speed VPLS, and a throttle corrective coefficient calculator calculates a corrective coefficient KV&thgr;TH based on a throttle opening &thgr;TH. A corrective coefficient multiplier multiplies the fuel corrective coefficient KVPLS and the corrective coefficient KV&thgr;TH, thus calculating a vehicle speed fuel adjustment corrective coefficient KVAF. An injection time calculator calculates a basic injection time TiM based on the throttle opening &thgr;TH and an engine rotational speed Ne, and also calculates a fuel injection time Ti by reading the vehicle speed fuel adjustment corrective coefficient KVAF and correcting the basic injection time TiM.

Abstract: An engine speed calculating apparatus capable of calculating an engine speed without being affected by pulsating revolutions in a low engine speed range. A time required for a crankshaft of an engine to revolve through a predetermined angle is measured upon each completion of revolution through the predetermined angle, and an engine speed is calculated on the basis of measured result data of the time required for revolution through the predetermined angle. When the preceding calculated engine speed is determined to be lower than a predetermined engine speed, an engine speed is calculated on the basis of a time required for the crankshaft to revolve through an angle larger than the predetermined angle.

Abstract: a control unit is provided for closing the throttle when the engine has been rotated for more than a prescribed time period at more than a prescribed number of revolutions, and the throttle has been opened for more than a prescribed time period at more than a prescribed opening. The control unit increases the number of engine revolutions to a predetermined number of revolutions irrespective of the throttle and maintains the same for a predetermined retention time when the steering handle is turned to the left or the right by more than a prescribed angle. The time to start controlling the number of engine revolutions may be delayed by providing a delay time for delaying the time to start controlling the engine revolutions. The number of engine revolutions may be controlled after the hull is underwater. As a consequence, the amount of sideslip of the jet propulsion boat can be improved.

Abstract: A totally closed value of the throttle valve of an engine having a fast idle function will be rendered capable of being correctly detected. The throttle valve can be opened and closed by the motor during a fast idle operation. The opening indicated value IACV to be supplied to the motor is a value obtained by adding the water temperature correction value and the atmospheric pressure correction value to the totally closed reference value. A value obtained by subtracting the water temperature correction value and the atmospheric pressure correction value from the actual opening to be detected by the throttle sensor is set to the totally closed value. At the totally closed value, there is provided a dead zone. When the value obtained by subtracting the water temperature correction value and the atmospheric pressure correction value from the actual opening goes out of the dead zone, the totally closed value is replaced with the value obtained by subtracting both correction values from the actual opening.

Abstract: A required fuel amount for an engine is calculated at a predetermined calculation cycle. A fuel injection amount to be injected from an upstream injection valve and a fuel injection amount to be injected from a downstream injection valve are then calculated. After fuel injection on the basis of the calculated fuel injection amounts, a lack of fuel delivered by the fuel injection amounts immediately before re-calculation of a required fuel amount at the calculation cycle until the end of an intake stroke (end of an intake valve opening period), is calculated by subtracting the fuel injection amounts from the re-calculated required fuel amount. The calculated lack of fuel amount is injected from the downstream injection valve during the intake stroke, e.g., in stages 6 and 7.

Abstract: A required fuel amount for an engine is calculated at a predetermined calculation cycle. A fuel injection amount to be injected from an upstream injection valve and a fuel injection amount to be injected from a downstream injection valve are then calculated. After fuel injection on the basis of the calculated fuel injection amounts, a lack of fuel delivered by the fuel injection amounts immediately before re-calculation of a required fuel amount at the calculation cycle until the end of an intake stroke (end of an intake valve opening period), is calculated by subtracting the fuel injection amounts from the re-calculated required fuel amount. The calculated lack of fuel amount is injected from the downstream injection valve during the intake stroke, e.g., in stages 6 and 7.

Abstract: Calculating an acceleration corrective in response to a subtle change in a throttle action by utilizing first and second rate-of-change calculators to calculate rates of change D&thgr;THA, D&thgr;THB of a throttle opening in preceding first and second periods (second period>first period) per a predetermined crankshaft rotational angle). A maximum value updater updates a stored value in a maximum value memory with a greater one of past and present maximum rates of change D&thgr;TH of the throttle opening, based on a compared result from a comparator. Points in a plurality of cycles read from a point calculator based on the maximum rate of change D&thgr;TH of the throttle opening are added together and inputted to a corrective value calculator.

Abstract: To change a fuel injection quantity to follow a throttle opening change in a low load region. A first calculator calculates a basic injection time using a throttle opening and an engine rotational speed. A second calculator calculates a basic injection time using an intake pipe negative pressure and the engine rotational speed. A selector selects the first calculator when the load is higher, and selects the second calculator when the load is lower. If the rate of change of the throttle opening is greater than a reference value, then a switcher sets the selector to select the first calculator. Thus, if the rate of increase of the throttle opening is greater than the reference value even when the load is low, the first calculator is selected.

Abstract: An engine speed calculating apparatus capable of calculating an engine speed without being affected by pulsating revolutions in a low engine speed range. A time required for a crankshaft of an engine to revolve through a predetermined angle is measured upon each completion of revolution through the predetermined angle, and an engine speed is calculated on the basis of measured result data of the time required for revolution through the predetermined angle. When the preceding calculated engine speed is determined to be lower than a predetermined engine speed, an engine speed is calculated on the basis of a time required for the crankshaft to revolve through an angle larger than the predetermined angle.