Keihin Corporation

Fujitsu Corporation

Fujitsu Semiconductor Limited

Fujitsu Microelectronics Limited

Kenichi Nomura

Takumi Kimura

Hideyuki Shinobu

Naoki Ozawa

Satoshi Chida

Hiroaki Tani

Hideaki Anbutsu

Toshiaki Chida

Cheng Giam Tan

A logic simulation method includes causing a physical specification detector to detect physical specifications of an analog circuit (a PLL circuit and a DLL circuit) as a verification object described in a logic library; causing a monitor to monitor whether a signal or setting during a logic simulation satisfies the physical specifications; and causing a warning section to issue a warning when the signal or the setting fails to satisfy the physical specifications.

Logic simulation method and logic simulator

A delay circuit has a second delay elementsupplied with a delay time control signal Vcntl from a frequency variable oscillatorincluding a first delay elementof which delay time as a concomitant of signal propagation is controlled by a delay time control signal and a phase inverting elementinverting a phase of the signal, and an adjusting element, connected in series to the second delay element, to which the signal is propagated, wherein a total of the delay time of the second delay elementand the delay time of the adjusting elementis adjusted.

Delay circuit

An electric parts attaching structure for a throttle body includes: a throttle body () having an intake passage () in which a throttle valve () is arranged, and a housing () for accommodating electric parts formed on the outside thereof; an intake passage information detection sensor () which is attached to a bottom section () of said housing () for detecting information in said intake passage (); and a circuit board () which is disposed on a side opposite to a side facing the bottom section (), of said intake passage information detection sensor (), and is attached to said housing () in state where connection pins () extending from the intake passage information detection sensor (), are inserted into connection holes ().

Electric parts attaching structure and attaching method for throttle body, and throttle body

To provide a fuel injection apparatus preferable for a marine engine which can prevent a metal soap from being generated in a motor portion of a high pressure electric pump even when fuel containing sea water is sucked into the electric pump, a high pressure electric pump (HP) is provided with a pump portion (P) and a motor portion within a pump housing (), the pump portion (P) sucks fuel within a vapor separator (V), high pressure fuel the pressure of which has been increased by the pump portion (P) is discharged through the periphery of the motor portion, the motor portion of the high pressure electric pump (HP) is formed as a brushless motor portion, and a resin material is molded on the outer periphery of a drive coil (B) constituting the brushless motor portion, thereby shutting off contact between the drive coil (B) and the fuel.

Fuel injection apparatus for marine engine

In a fuel injection apparatus in which a pressure regulator is attached to a vapor separator, in order to make the vapor separator compact, to improve corrosion resistance of the pressure regulator and to maintain a stable pressure regulating operation for a long time period, a vapor separator is constituted by a chamber and a cover, a pressure regulator is arranged within a recess portion of the cover and above a fixed fuel liquid surface, the longitudinal axis of the pressure regulator is arranged in a state of being approximately parallel to the fuel liquid surface, a pressure fuel inflow passage is formed in the cover and is formed so as to be branched from a fuel discharge passage formed in the cover, and a vent hole of a spring chamber is open at a lower position in the gravitational direction.

A voltage controlled oscillation circuit with an oscillation frequency thereof controlled in accordance with an external voltage is disclosed. An odd number of inversion circuit elements such as inverters for inverting output signals thereof with respect to input signals thereto are connected in series with each other. An output side of the last-stage one of the odd number of the inversion circuit elements is connected to an input side of the first-stage one of the inversion circuit elements to thereby cause an oscillation. A plurality of oscillation frequency variable control units such as variable resistor circuit elements for changing an oscillation frequency in accordance with an external voltage are each inserted between each set of adjacent inversion circuit elements. A plurality of fixed resistor circuit elements each having a fixed resistance value are connected in parallel with a plurality of the oscillation frequency variable control units, respectively. The functions of both the variable resistor circuit elements and the fixed resistor circuit elements can be carried out at the same time by the use of a depletion type transistor or a transistor of a short channel type.

Voltage controlled oscillation circuit having oscillation frequency variable control units inserted between inversion circuit elements

The invention provides a fuel distribution pipe which can restrict an increase of temperature of a fuel flowing within a fuel distribution path of the fuel distribution pipe, whereby it is possible to improve an operation property of the engine. In the fuel distribution pipe, the fuel distribution path is pierced along a line X&mdash;X in a direction of a longitudinal axis of the fuel distribution pipe and an injection valve supporting hole for inserting and supporting a rear end portion of the fuel injection valve and a fuel introduction path for supplying a fuel having a pressure increased by a fuel pump are continuously provided in the fuel distribution path of the fuel distribution pipe, and a cooling water flow path extending along the line X&mdash;X in the direction of the longitudinal axis of the fuel distribution path and sectioned from the fuel distribution path is provided on an outer periphery of the fuel distribution path, thereby introducing a cooling water into the cooling water flow path.

Fuel distribution pipe in fuel injection apparatus

A mounting apparatus of a fuel injection valve by which a fuel injection valve can be securely mounted to a fuel distributing pipe with a significantly simple engaging member so as to improve a performance of mounting to a suction pipe and increase a production efficiency. In accordance with the mounting structure of the fuel injection valve, in a state of the fuel introduction cylinder portion ( ) of the fuel injection valve (J) being inserted into the fuel introduction cylinder portion guide hole ( ) of the fuel distributing pipe (D) and the rear end surface ( A) of the engaging flange portion ( ) being brought into contact with the lower end surface (D ) of the fuel distributing pipe (D), the first engaging protrusion ( A) of the engaging member (K) is arranged in such a manner as to be engaged with the first engaging groove ( ) of the fuel distributing pipe (D), the fork portion ( ) is arranged in such a manner as to be inserted between the opposing flat wall portions ( E, F) of the fuel injection valve (J), the second engaging protrusion ( ) is arranged in such a manner as to be fitted to the second engaging groove ( ) of the fuel distributing pipe (D), and the engaging flange portion ( ) of the fuel injection valve (J) is gripped by the lower end surface (D ) of the fuel distributing pipe (D) and the fork portion ( ) of the engaging member (K).

Mounting apparatus of fuel injection valve

A fixing unit has a crown-shaped resilient member comprising an annular cylindrical member and a flange extending integrally from an upper end of the annular cylindrical member. The annular cylindrical member has a first tooth, and the flange has a second curved portion. The first tooth engages in an annular groove defined in the outer circumferential surface of an upper end of the housing, and the second curved portion presses a step on the outer circumferential surface of a lower portion of a sensor case, for fixing the sensor case and the housing to each other. A first support has a first flange supported on a step on an inner wall surface of the housing, and a second support has a first flange supported on another step on the inner wall surface of the housing. A coil is sandwiched and held between the first and second supports. The sensor case is directly held against the first support. The lower surface of the sensor case and the upper end of the housing are spaced a given distance from each other. A crown-shaped resilient member is installed on joined portions of the sensor case and the housing to hold the sensor case, the housing, the first and second supports, and the coil securely together.

Valve device

A coupling means comprises a first retainer and a second retainer. The first and second retainers are fastened to a first annular groove and a second annular groove of a valve stem respectively, and they are fixed by an energizing action in the vertical direction effected by a second elastic member. The first retainer is energized upwardly by a first elastic member provided on a lower side of the first retainer, and it abuts against the lower surface of a projection of a plunger. In this arrangement, the plunger is displaced downwardly while pressing the first retainer. Thus, the valve stem is moved downwardly together with the first retainer.

Growing community of inventors

Kawasaki, Japan

Kenichi Nomura