Abstract: In an apparatus for controlling warm-up operation of a general-purpose internal combustion engine having a throttle valve installed in an air intake pipe and connectable to an operating machine to be used as a prime mover of the machine, it is configured to calculate a basic fuel injection amount based on an engine speed and a throttle opening and control engine warm-up operation by calculating a warm-up time fuel injection amount by correcting the calculated basic fuel injection amount based on one of a temperature change amount of a spark plug seat of the engine, the throttle opening and an output of the operating machine and injecting fuel from an injector by the calculated warm-up time fuel injection amount. With this, it becomes possible to calculate a fuel injection amount suitable for the engine warm-up condition by using an appropriate parameter in place of the lubricating oil temperature.

Abstract: In an apparatus installed on a boat (A) in plural boats including (A, B) for avoiding collision with the boat (B), there are equipped with first and second radio-wave transceiver units installed at spaced positions that transmit to and receive radio waves of a predetermined frequency from the boat (B), and first and distance calculating units that calculate clearance distances from the boat (B) based on attenuation degree of the radio waves transmitted from the boat (B). An intersection point of circles whose origins in an x-y coordinate plane are set to positions corresponding to the first and second positions and whose radii are set to values corresponding to the calculated clearance distances. Direction and position of the boat (B) are estimated from the intersection point, and an instruction necessary for avoiding collision with the boat (B) is issued based on the estimated direction and position.

Abstract: In an apparatus for controlling posture of a small boat having a hull and an even number of outboard motors mounted side by side on a stern of the hull, each equipped with a propeller driven by an engine and a throttle actuator adjusting a throttle valve opening of the engine, an inclinometer is installed in one of the outboard motors that produces an output indicating inclination of the hull relative to a vertical axis around a roll axis. It is determined whether the hull inclines to port or starboard from the output of the inclinometer and when it does, operation of the throttle actuators of the outboard motors are controlled on a side determined to incline downward to increase engine speed, while controlling operation of the throttle actuator of the outboard motor on a side determined to incline upward to decrease the engine speed.

Abstract: In a small boat emergency stop apparatus having an operator's cockpit and a passenger seat installed spaced apart from the cockpit, there are provided with an operator transmitter wearable by the operator to transmit a radio-wave signal of a predetermined strength, a passenger transmitters wearable by the passenger to transmit a radio-wave signal of the same predetermined strength and a receiver installed at a location closer to the cockpit than the passenger seat to receives the radio-wave signals transmitted by the operator and passenger transmitters successively. It is identified which of the operator and the passenger is a wearer of the transmitter and is then discriminated whether strength of the radio-wave signal transmitted from the identified wearer is smaller than a predetermined value. When it is, it is discriminated that emergency occurred in the wearer and an emergency action of engine stopping or engine speed reducing is performed.

Abstract: An image signal processing apparatus includes a first control unit starting activation in response to an activation request, a decoding unit, and a second control unit. Each of the decoding unit and the second control unit starts activation when the first control unit completes the activation, and shifts from an off-state to a normal operating state after the activation is completed. In the normal operating state, the decoding unit receives an image signal from outside and outputs the image signal after executing a decoding process to the image signal. In the normal operating state, the second control unit processes an image included in the image signal outputted from the decoding unit, and displays the processed image. When the first control unit completes the activation and the decoding unit completes the activation, the first control unit instructs the decoding unit to perform a setting for executing the decoding process.

Abstract: In an apparatus for controlling an air/fuel ratio of a general-purpose internal combustion engine using mixed fuel containing alcohol and gasoline and operated at a desired engine speed inputted by the operator while a throttle opening is regulated such that a detected engine speed converges to the inputted desired engine speed, a fuel injection amount for mixed fuel determined based on fuel injection amount characteristics is increased/decreased when a load is kept constant and the output air/fuel ratio (at which an output of the engine becomes maximum) is estimated. And the fuel injection amount is corrected based on the estimated air/fuel ratio, thereby enabling to estimate the output air/fuel ratio without using an expensive air/fuel ratio sensor and to feedback-control the fuel injection amount such that the engine is operated at the output air/fuel ratio.

Abstract: A vehicular video processing device includes a clock output unit and an output unit. A video signal output from an external video device via a video signal receiving unit and having predetermined format and first bit width is inputted to the vehicular video processing device together with a first clock signal. The clock output unit outputs a second clock signal having a frequency acquired by multiplying first clock signal frequency by a predetermined multiplier factor. The output unit converts the video signal having the first bit width to a video signal having a second bit width smaller than the first bit width according to the multiplier factor, and outputs the converted video signal together with the second clock signal. With above-described device, image processing can be properly performed to a video signal having a format difficult to be directly input or output.

Abstract: A vehicular video processing device includes a clock output unit and an output unit. A video signal output from an external video device via a video signal receiving unit and having predetermined format and first bit width is inputted to the vehicular video processing device together with a first clock signal. The clock output unit outputs a second clock signal having a frequency acquired by multiplying first clock signal frequency by a predetermined multiplier factor. The output unit converts the video signal having the first bit width to a video signal having a second bit width smaller than the first bit width according to the multiplier factor, and outputs the converted video signal together with the second clock signal. With above-described device, image processing can be properly performed to a video signal having a format difficult to be directly input or output.

Abstract: In an apparatus for detecting fuel shortage of a general-purpose internal combustion engine connectable to an operating machine to be used as a prime mover of the machine, the engine being supplied with fuel stored in a tank and having an actuator adapted to open and close a throttle valve installed in an air intake pipe so as to achieve a desired engine speed set by an operator, comprising a fuel shortage condition detector adapted to detect whether the engine is in a fuel shortage condition, and an engine stopper adapted to stop the engine when the engine is detected to be in the fuel shortage condition. With this, it becomes possible to detect whether the engine having the electronic governor is in the fuel shortage condition, thereby preventing occurrence of trouble such as afterburning.

Abstract: In an apparatus for controlling an air/fuel ratio of a general-purpose internal combustion engine using mixed fuel containing alcohol and gasoline and operated at a desired engine speed inputted by the operator while a throttle opening is regulated such that a detected engine speed converges to the inputted desired engine speed, a fuel injection amount prepared for mixed fuel is increased/decreased when a load is kept constant and the output air/fuel ratio (at which an output of the engine becomes maximum) is estimated. A rate of alcohol contained in the fuel is estimated from the estimated air/fuel ratio and the fuel injection amount is corrected based on the estimated alcohol rate, thereby determining the fuel injection amount appropriately in accordance with the estimated alcohol rate.

Abstract: In an apparatus for discriminating a piston stroke of a general-purpose internal combustion engine connectable to an operating machine to be used as a prime mover of the machine and having a four-stroke operating cycle comprising intake, compression, expansion and exhaust, the operating cycle is discriminated based on intake air temperature detected by an intake air temperature sensor whether a stroke next to a predetermined crank angular position at which a crank angle sensor produces an output is the intake stroke or the expansion stroke, when operation of the engine is determined to be under a stable condition. With this, it becomes possible to discriminate the four-stroke operating cycle of the general-purpose engine without using an expensive pressure sensor.

Abstract: A power generator starts an engine by overcoming an inrush current occurs. A calculator (21) retrieves an outputtable current of a generator according to an engine speed. A calculator (23) calculates the lacking amount of the outputtable current relative to a load current. When the remaining battery level is sufficient, a DC/DC converter controller (24) supplies a current corresponding to the lacking amount from the battery (4) to a DC part (52). If the battery (4) starts supplying a power, FETs (Qa to Qf) of a rectifying part (51) are powered off and an output of the power generator (3) is stopped. When an engine frequency stability deciding part (27) decides the engine frequency is stable the rectifying part (51) restarts the output of the generator (3) and the current supply from the battery (4) to the DC part (52) is stopped.

Abstract: In an apparatus for detecting fuel shortage of a general-purpose internal combustion engine connectable to an operating machine to be used as a prime mover of the machine, the engine being supplied with fuel stored in a tank and having an actuator adapted to open and close a throttle valve installed in an air intake pipe so as to achieve a desired engine speed set by an operator, comprising a fuel shortage condition detector adapted to detect whether the engine is in a fuel shortage condition, and an engine stopper adapted to stop the engine when the engine is detected to be in the fuel shortage condition. With this, it becomes possible to detect whether the engine having the electronic governor is in the fuel shortage condition, thereby preventing occurrence of trouble such as afterburning.

Abstract: In an apparatus for discriminating a piston stroke of a general-purpose internal combustion engine connectable to an operating machine to be used as a prime mover of the machine and having a four-stroke operating cycle comprising intake, compression, expansion and exhaust, the operating cycle is discriminated based on intake air temperature detected by an intake air temperature sensor whether a stroke next to a predetermined crank angular position at which a crank angle sensor produces an output is the intake stroke or the expansion stroke, when operation of the engine is determined to be under a stable condition. With this, it becomes possible to discriminate the four-stroke operating cycle of the general-purpose engine without using an expensive pressure sensor.

Abstract: In an apparatus for controlling warm-up operation of a general-purpose internal combustion engine having a throttle valve installed in an air intake pipe and connectable to an operating machine to be used as a prime mover of the machine, it is configured to calculate a basic fuel injection amount based on an engine speed and a throttle opening and control engine warm-up operation by calculating a warm-up time fuel injection amount by correcting the calculated basic fuel injection amount based on one of a temperature change amount of a spark plug seat of the engine, the throttle opening and an output of the operating machine and injecting fuel from an injector by the calculated warm-up time fuel injection amount. With this, it becomes possible to calculate a fuel injection amount suitable for the engine warm-up condition by using an appropriate parameter in place of the lubricating oil temperature.

Abstract: A power generator starts an engine by overcoming an inrush current occurs. A calculator (21) retrieves an outputtable current of a generator according to an engine speed. A calculator (23) calculates the lacking amount of the outputtable current relative to a load current. When the remaining battery level is sufficient, a DC/DC converter controller (24) supplies a current corresponding to the lacking amount from the battery (4) to a DC part (52). If the battery (4) starts supplying a power, FETs (Qa to Qf) of a rectifying part (51) are powered off and an output of the power generator (3) is stopped. When an engine frequency stability deciding part (27) decides the engine frequency is stable the rectifying part (51) restarts the output of the generator (3) and the current supply from the battery (4) to the DC part (52) is stopped.

Abstract: Suppresses noise due to high engine speed and improves emission and fuel consumption of a hybrid generator. A difference computing unit 29 computes a first difference between an alternator output and a load output. A difference computing unit 31 computes a second difference between a battery output and the load output. When the battery output is greater than a battery output stopping threshold, the alternator output is fixed and the first difference is compensated for by the battery output. When the battery output is less than the battery output stopping threshold, the engine speed is increased to compensate for the second difference by the output of the alternator 3. To compensate for the second difference, a target engine speed is determined using a relationship of the second difference and the target engine speed. The engine speed is converged at the target engine speed.

Abstract: A PLL circuit is disclosed that comprises a controlling unit that switches at a predetermined timing to enable/disable the phase difference signal supplied from the phase comparator to the low pass filter; and a resistor element that is disposed between a predetermined potential and a signal line for supplying the phase difference signal from the phase comparator to the low pass filter, when the phase difference signal is enabled, the oscillation circuit performing oscillation operation based on the voltage signal corresponding to the phase difference signal, when the phase difference signal is disabled, the low pass filter being supplied with the predetermined potential through the resistor element to allow the oscillation circuit to perform oscillation operation based on the voltage signal generated depending on the supplied predetermined potential.

Abstract: In an apparatus for controlling an air/fuel ratio of a general-purpose internal combustion engine using mixed fuel containing alcohol and gasoline and operated at a desired engine speed inputted by the operator while a throttle opening is regulated such that a detected engine speed converges to the inputted desired engine speed, a fuel injection amount prepared for mixed fuel is increased/decreased when a load is kept constant and the output air/fuel ratio (at which an output of the engine becomes maximum) is estimated. A rate of alcohol contained in the fuel is estimated from the estimated air/fuel ratio and the fuel injection amount is corrected based on the estimated alcohol rate, thereby determining the fuel injection amount appropriately in accordance with the estimated alcohol rate.

Abstract: In an apparatus for controlling an air/fuel ratio of a general-purpose internal combustion engine using mixed fuel containing alcohol and gasoline and operated at a desired engine speed inputted by the operator while a throttle opening is regulated such that a detected engine speed converges to the inputted desired engine speed, a fuel injection amount for mixed fuel determined based on fuel injection amount characteristics is increased/decreased when a load is kept constant and the output air/fuel ratio (at which an output of the engine becomes maximum) is estimated. And the fuel injection amount is corrected based on the estimated air/fuel ratio, thereby enabling to estimate the output air/fuel ratio without using an expensive air/fuel ratio sensor and to feedback-control the fuel injection amount such that the engine is operated at the output air/fuel ratio.