Abstract: A fuel injection control device for an internal combustion engine includes a canister which temporarily collects fuel vapor purge gas generated in a fuel tank and a canister purge gas control system which introduces the collected fuel vapor purge gas into the internal combustion engine during the operation thereof.

Abstract: A malfunction detecting apparatus of an evaporated fuel purge system includes: a negative pressure control part for switching on a purge control valve to open a purge line between a canister and an intake passage of an engine during a process time, and for switching off the purge control valve at the end of the process time, so that the purge line and a vapor line are subjected to a negative pressure of the intake passage; a pressure detecting part arranged in a line connected to the purge line and to the vapor line for measuring a purge line pressure within the system and for outputting the measured pressure; and a discriminating part for detecting whether or not a malfunction in the system has occurred, based on the measured pressure supplied from the pressure detecting part, for calculating a continuous time during which the measured pressure is continuously lower than a reference pressure value within the process time, and for detecting whether or not the continuous time exceeds a reference time value wit

Abstract: A rotary distributor type fuel pumping apparatus has two pairs of plungers housed in respective diametrical bores which intersect each other. One of the plungers is longer than the remaining plungers conveniently by providing an extension at its inner end. The extension lies in the paths of movement of the remaining plungers so as to minimize the risk of damage to the plungers.

Abstract: When a damage in a high pressure line of a fuel pressure control system for a high pressure fuel injection engine is detected the fuel pressure is reduced to prevent fuel from blowing out of the damaged part. An acceleration detected by the acceleration sensor is compared with a set value. When the detected acceleration exceeds the set value, the system determines that such an emergency as a collision has happened, fully opens a solenoid type high pressure regulator provided downstream of the high pressure line of fuel system and stops the operation of a feed pump provided in a low pressure delivery line. Thereupon, the feed pump stops delivering the fuel to a high pressure fuel pump. On the other hand, the high pressure regulator is in a fully opened position. Thus, the fuel pressure in the high pressure line is relieved to a fuel tank.

Abstract: A method for determining the operability of a tank-venting system on a motor vehicle subjects the signals for the volume flow through the tank-venting valve and the signals for the pressure difference between the tank interior and the ambient to a cross-covariance analysis. The above-mentioned signals are formed by a high pass in advance of forming the cross-covariance function and the maximum or the mean value of the cross-covariance function is formed with respect to the product of the two input variables. A variance measure is formed for the signal of the volume flow through the tank-venting valve and a transfer factor is computed from the variance measure and the mean value or maximum. The tank-venting system is deemed to be operational when the transfer range lies in a pregiven region. An advantage of the method is seen in the independence of the tank-pressure changes which are not caused by volume-flow changes through the tank-venting valve.

Abstract: An evaporative emission control system of an internal combustion engine's fuel system including a vent valve. The vent valve provides a mechanism for closing the evaporative emission control system creating a pressure differential between system and atmospheric under various conditions whereby the system can be automatically diagnosed. The vent valve relieves pressure or vacuum in the system that exceeds a threshold necessary to detect the presence of leaks. The vent valve includes a vacuum actuator providing a low restriction flow path for system purges.

Abstract: A throttle control system capable of ensuring and maintaining a minimum function of driving a motor vehicle by engine power with safety. A malfunction detection section detects a malfunction of at least one of first and second accelerator sensors and an accelerator switch on the basis of first and second accelerator operation amount signals and an accelerator switch output signal. A throttle opening control section forms a throttle control signal according to the first accelerator operation amount signal when the accelerator sensors are operating normally, and forms the throttle control signal on the basis of the accelerator output signal when a malfunction of the first or second accelerator sensor is detected.

Abstract: A device for feeding the vapors present in the free space of a fuel tank into the intake manifold of an internal combustion engine wherein the free space and the intake manifold are connected by a line in which an activated carbon container and a stop valve are connected in series, the activated carbon container being connected with the atmosphere by a vent line and the vent line can be closed by a vent line valve. The device further comprises an excess pressure valve and/or a vacuum valve which may be in the same housing as the vent line valve.

Abstract: An evaporative emission control system includes a valve arranged in a passage communicating between a fuel tank and a canister. The valve opens the passage when pressure within part of the evaporative emission control system upstream of the valve exceeds a predetermined value and, closes the passage when the pressure is below the predetermined value. It is determined that the evaporative emission control system is normal when a value of the pressure with the part of the system detected by a pressure sensor is lower than a predetermined reference value below atmospheric pressure.

Abstract: In a diagnostic apparatus for an evaporative fuel purge system having a canister receiving fuel from a fuel tank via a vapor passage, the fuel being supplied to an intake air passage of an internal combustion engine via a purge passage from the canister, a pressure detecting unit detects a pressure in the evaporative fuel purge system. A decision making unit determines whether or not a failure has occurred in the evaporative fuel purge system on the basis of a relationship between the pressure detected by the pressure detecting unit and a decision value. A correction unit corrects the relationship on the basis of a value of a parameter having an influence on the pressure detected by the pressure detecting unit.

Abstract: The tank/canister volume's integrity against unacceptable leakage measured by a diagnostic test performed by an on-board diagnostic system which includes an electrically operated air pump and tank-mounted analog pressure transducer. At the beginning of a test, the engine management computer closes the canister purge solenoid valve and operates the pump to begin pressurization of the tank/canister volume. The pumped air is introduced via the canister's atmospheric vent port at a regulated pressure. Failure to build tank pressure to a predetermined pressure within a predetermined time indicates a gross leak. If no gross leak exists, the pressure will build, and the time required to build to a given pressure from the start pressure provides a measurement of any leakage that may be present. The fuel fill level in the tank affects this time, and it is taken into account in the measurement.

Abstract: An apparatus and method for use in diagnosing an evaporative emission canister collection and purge system. An EVAP system of a vehicle can be diagnosed through the use of a swellable adsorbent disposed in the system's canister. The swellable adsorbent is expandable upon adsorption of fuel vapors and contractible upon desorption. By sensing the expansion and contraction response, a diagnostic mechanism can determine whether the vapor collection and purge functions are operating properly.

Abstract: A fuel vapor purge system for an internal combustion engine comprises a fuel tank, a purge pipe for introducing fuel vapor generated in the fuel tank into an intake passage of the engine, a purge valve installed in the piping, an engine control unit for opening the purge valve in dependence on the state in which the engine operates, a pressure sensor for detecting a pressure within the fuel tank, and an alarm being operative under the control of the engine control unit. The engine control unit opens the purge valve for a first predetermined period when the engine operation is in a steady state, makes decision as to occurrence of an abnormality in the purge system on the basis of a magnitude of change in the internal pressure of the fuel tank over a second predetermined period covering the first predetermined period, and activates the alarm when occurrence of an abnormality is determined.

Abstract: An evaporative fuel-processing system for an internal combustion engine, incorporates an evaporative emission control system in which a first control valve is arranged across an evaporative fuel-guiding passage extending between a fuel tank and a canister, a second control valve across a purging passage extending between the canister and the intake system of the engine, and a third control valve at an air inlet port of the canister, respectively. An ECU generates operation command signals to the first to third control valves for closing or opening the same to bring the evaporative emission control system into a predetermined negatively pressurized state. The ECU is responsive to an output from a parameter sensor which detects at least one of vehicle speed, temperature within the fuel tank, and an amount of fuel within the fuel tank, for determining whether there is an abnormality in the evaporative emission control system, based upon an output from a tank internal pressure sensor.

Abstract: A method for testing for the operability of a tank-venting apparatus on a motor vehicle having an internal combustion engine, the tank-venting apparatus including a tank having a tank pressure sensor, an adsorption filter and a venting line which is closable via a shutoff valve and a tank-venting valve, the adsorption filter being connected to the tank via a tank-supply line and the tank-venting valve being connected to the adsorption filter via a valve line.

Abstract: Leakage from a portion of a canister purge system which includes a fuel tank and a vapor collection canister is detected by closing off that portion and then positively pressurizing it by means of an air pump. The air that is pumped by the air pump is split into two separate paths, one to pressurize the closed-off portion of the system, and the other to flow through a known orifice. A differential flow meter compares the flow through one path with that through the other to determine if there is leakage.

Abstract: A tank venting system which avoids soiling of the negative pressure protection valve which can cause problems in functional capability. The negative pressure protection valve is preceded by the intake air filter of the engine, so that with the negative pressure protection valve opened, a pressure equalization between the atmosphere and the tank venting system takes place by means of intake air filtered by the intake air filter. The tank venting system according to the invention is used to vent a fuel tank of a mixture-compressing internal combustion engine with externally supplied ignition.

Abstract: An on-board diagnostic system for an evaporative emission control system of an internal combustion engine powered vehicle employs a positive displacement reciprocating pump to create in evaporative emission space a pressure that differs significantly from ambient atmospheric pressure. The pump is powered by using engine intake manifold vacuum to force an intake stroke during which both an internal spring is increasingly compressed and a charge of ambient atmospheric air is created in an air pumping chamber space. Vacuum is then removed, and the spring relaxes to force a compression stroke wherein a portion of the air charge is forced into the evaporative emission space. The rate at which the pump reciprocates to alternately execute intake and compression strokes indicates the pressure and flow through a leak in the evaporative emission space. Detection of this rate serves as a measurement of leakage for the purpose of distinguishing integrity of the evaporative emission space from non-integrity.

Abstract: A flame arrestor is disclosed for use with an intake of an internal combustion engine, comprising a cylindrical housing defining an inlet and an outlet and a plurality of honeycombed passageways extending between the inlet and the outlet, wherein each of the plurality of honeycombed passageways has a predetermined length and a predetermined small cross-section substantially smaller than the predetermined length. The cylindrical housing is welded within a mounting bracket adapted for receipt in the intake of the internal combustion engine. The flame arrestor is particularly beneficial for use in a boosted engine in that cooling effectiveness and manufacturability are enhanced by the use of the honeycombed structure.

Abstract: An insert to be threaded into a spark plug hole of an internal combustion engine. The insert includes a reservoir for holding lubricant and a dessicant to protect the engine during periods of storage. The non threaded end of the insert includes a tip on which the spark plug wires may be attached in order to keep the wires in order.

Abstract: A failure-detecting device detects failure of a tank internal pressure sensor for an internal combustion engine. The tank internal pressure sensor is provided in a fuel tank for detecting pressure within the fuel tank. The failure of the tank internal pressure sensor is detected by detecting an amount of variation in an output from the tank internal pressure sensor occurring within a predetermined time period elapses after the start of the engine and determining that the tank internal pressure sensor is abnormal when the amount of variation is below a predetermined value upon the lapse of the predetermined time period. A fail-safe device inhibits abnormality diagnosis of the evaporative emission control system when it is determined that the tank internal pressure sensor is abnormal.

Abstract: A breather valve for the gas tank of an internal combustion engine having an adsorption filter which is linked to the atmosphere by a breather line which is controlled by a shut-off valve. The tank breather valve is constructed so that pressure build up in the fuel tank, the lines, and the adsorption filter do not lead to damage of the valves. The magnetic circuit of the shut-off valve provides that above a predetermined pressure in the adsorption filter, the generated pressure is sufficient to open the shut-off valve, thereby facilitating pressure relief without any damage. The breather is particularly suitable for internal combustion engines in motor vehicles.

Abstract: An evaporated fuel purge control apparatus includes a purge control valve arranged in a purge passage between a canister and an intake passage of an engine, the purge control valve being switched on and off in accordance with a control factor, the control factor indicating a duty ratio of an on-time of the purge control valve within a duty cycle to a total duty-cycle time, a detecting part for detecting an operating condition under which the engine is operating, and a flow rate control part for setting a control factor for the purge control valve in accordance with the operating condition detected by the detecting part, the control factor set by the flow rate control part allowing a flow rate of evaporated fuel fed from the canister into the intake passage through the purge control valve to be maintained at a constant level when the operating condition of the engine changes.

Abstract: A method of monitoring, while on board an automotive vehicle, one or more of catalyst performance, engine misfire, and combustion quality, the vehicle having an internal combustion engine equipped with a catalyst for converting noxious emissions of the engine, comprising: (i) exposing at least one pair of EGO sensors to substantially the same emissions either exiting from the engine or from the catalyst, one of the EGO sensors having its electrode highly catalytic, and the other sensor having its electrode low-to-noncatalytic; (ii) comparing the outputs of the sensor electrodes (amplitude, frequency, or phase shift) to determine if there is a sufficient differential to indicate a misfire or poor combustion in the case of the sensors being located downstream of the engine exhaust but upstream of the catalyst, or indicating poor catalyst efficiency in the case of the sensors being placed substantially immediately downstream of the catalyst. The catalyst may be a three-way catalyst (or an oxidation catalyst).

Abstract: In a fuel vapor processing apparatus of a fuel tank for an internal combustion engine, fuel vapor in the fuel tank is supplied to a fuel vapor collecting canister filled with an absorbent, and is absorbed and collected therein, and the absorbed fuel in the canister is introduced into the downstream of a suction air throttle valve in a suction air passage through a control valve.

Abstract: A method of monitoring, while on board an automotive vehicle, one or more of catalyst performance, engine misfire, and combustion quality, the vehicle having an internal combustion engine equipped with a catalyst for converting noxious emissions of the engine, comprising: (i) exposing at least one pair of EGO sensors to substantially the same emissions either exiting from the engine or from the catalyst, one of the EGO sensors having its electrode highly catalytic, and the other sensor having its electrode low-to-noncatalytic; (ii) comparing the outputs of the sensor electrodes (amplitude, frequency, or phase shift) to determine if there is a sufficient differential to indicate a misfire or poor combustion in the case of the sensors being located downstream of the engine exhaust but upstream of the catalyst, or indicating poor catalyst efficiency in the case of the sensors being placed substantially immediately downstream of the catalyst. The catalyst may be a three-way catalyst (or an oxidation catalyst).

Abstract: A fuel delivery control apparatus for use with an internal combustion engine having a throttle valve located in an induction passage for controlling the amount of air to the engine. The engine is associated with an evaporated fuel purging unit having a canister adapted to accumulate evaporated fuel from a fuel tank. A basic value of the amount of fuel metered to the engine is calculated based on the sum of the amount of air supplied to the engine through the throttle valve and the amount of air supplied to the engine from the canister. The basic value is corrected by subtracting the amount of evaporated fuel introduced from the canister to the engine from the calculated basic value. The fuel metered to the engine is controlled based on the corrected basic value.

Abstract: An apparatus for controlling pressures within a fuel tank is provided in a purge pipe connected between the fuel tank and a canister. In an operating condition of an engine, a diaphragm in a control valve provided in a purge pipe between the fuel tank and the canister is moved upward by an intake negative pressure to decrease a set load of a spring, and in a stopped condition of the engine, the diaphragm moves downward to increase the set load of the spring. As a result, in the operating condition of the engine, a valve member is opened when a pressure within the fuel tank exceeds a lower predetermined level. In the stopped condition of the engine, the valve member is opened when a pressure within the fuel tank exceeds a higher predetermined level. Therefore, even when a leakage accident occurs in the operating condition of the engine, evaporated fuel is prevented as much as possible from being discharged in a large amount into the atmosphere.

Abstract: A pair of embodiments of flame arrester arrangements for marine propulsion engines wherein the flame arrester is positioned vertically above the thermostat housing at one end of the engine and the plenum chamber for the intake manifold is disposed above the exhaust elbow of the engine so as to provide good induction efficiency and compact size. Different configurations of flame arresters are disclosed and they both provide very large effective inlet areas and, at the same time, good flame protection.

Abstract: An evaporative fuel-processing system for an internal combustion engine, in which a first control valve is arranged across an evaporative fuel-guiding passage extending from a fuel tank to a canister, a second control valve across a purging passage extending from the canister to the intake system of the engine, and a third control valve at an air inlet port of the canister, respectively. An ECU generates operation command signals to the first to third control valves for closing or opening the same. The ECU is responsive to an output from a tank internal pressure sensor which detects pressure within the fuel tank and the operation command signals, for detecting an abnormality in operation of a predetermined one of the first to third control valves.

Abstract: An evaporative fuel-processing system for an internal combustion engine includes an evaporative emission control system having a canister, a first passage connecting between the canister and a fuel tank, a second passage connecting between the canister and the intake system of the engine, and a purge control valve arranged across the second passage, a drain shut valve for opening and closing an inlet port of the canister, and pressure sensors for detecting pressure within the evaporative emission control system. The evaporative emission control system is negatively pressurized by introducing negative pressure from the intake system into the evaporative emission control system by opening the purge control valve and closing the drain shut valve, to thereby bring the evaporative emission control system into a predetermined negatively pressurized state, and then closing the purge control valve to complete the negative pressurization.

Abstract: The invention relates to a method and an arrangement for diagnosing a tank-venting system of a motor vehicle wherein a pregiven underpressure is adjusted in the tank-venting system in order to determine if the system is tight. Then, a check is made to determine at which gradient this underpressure decays when the tank-venting system is completely closed. The system is evaluated as being leaky when the underpressure decays more rapidly than corresponding to a pregiven threshold. To arrive at the pregiven underpressure, much more vapor must be pumped from the system for an empty tank than for a full tank. The pulse-duty factor for opening the tank-venting valve on the system is made to vary in dependence upon the fill level of the tank in order that pumping does not take place too rapidly or too intensely for a full tank and not too long for an almost-empty tank.

Abstract: A tank-venting system has the following features: a tank 10; an adsorption filter 13 which is connected to the tank via a tank-connecting line 12 and which has a venting line 14 which can be closed off by a shut-off valve 15; and, a tank-venting valve 16 which is connected to the adsorption filter via a valve line 17; a pressure connection 21 on the valve line close to the tank-venting valve; and, a pressure sensor 11 on the tank.With the aid of this tank-venting system, the following method can be carried out: closing the tank-venting valve and the shut-off valve; supplying compressed air to the pressure connection; measuring the pressure in the tank; and, checking if the pressure satisfies a pregiven pressure condition and determining the tank-venting system as being inoperable in the event that this is not the case.

Abstract: An apparatus for monitoring air leakage into a fuel supply system for an internal combustion engine is provided. This system comprises a pressure sensor for detecting a pressure level in a fuel supply passage of the fuel supply system which communicates between a fuel tank and an intake passage of the engine and providing a signal indicative thereof, an air leakage control valve for leaking ambient air into the fuel supply passage at a preselected rate, and an air leakage monitoring unit for detecting a first pressure in the fuel supply system when the air leakage control valve is closed to restrict the leakage of the ambient air and a second pressure when the air leakage control valve is open to leak the ambient air into the fuel supply passage, the air leakage monitoring unit providing an alarm signal indicating that there is a preselected amount of air leakage in the fuel supply system based on a difference between the first and second pressures.

Abstract: A fuel injection device for internal combustion engines, in which the control of the high-pressure delivery of the pump piston is achieved via a magnet valve disposed in a line between the pump work chamber and a fuel tank. To that end, the magnet valve has a valve member, actuated counter to the force of a valve spring by an electrical actuator and the valve member cooperates, by its sealing face with a valve seat and is pressure balanced via a cross-sectional constriction, which is disposed in a pressure chamber that communicates with the pump work chamber. In the event of a fracture of the valve member, in order to avoid blocking of the magnet valve when closed and an attendant uncontrolled, excessive fuel injection quantity, an axial bore is disposed inside the valve member, which bore feeds into a connecting line and on into the low-pressure chamber, and via which the high fuel pressure can drop after the valve member breaks.

Abstract: A control system is described for the electric fuel pump of an internal combustion engine, with a sensor for the speed of a shaft of the engine and with a logic circuit for providing a shut off signal for the pump, depending on the speed detected, where the signal of a further sensor (14) for the speed is supplied to the a logic circuit (16, 17), and where shut off then takes place only when both speed signals deviate from a specified range. In this way, it is ensured that the vehicle remains drivable if one of the two sensors (13) or (14) fails.

Abstract: A control system for a multiple cylinder, direct fuel injected, spark ignited, internal combustion engine that protects the fuel injectors by precluding the possibility of firing of the spark plugs at a time when a fuel injector is open and if the kill switch has been turned on. The control circuit precludes the disabling of the ignition circuits until all fuel injectors of the engine are in their closed positions.

Abstract: An evaporative fuel-processing system for an internal combustion engine in a vehicle, comprises an evaporative emission control system. A purge control valve is arranged across a purging passage for controlling opening thereof, and a drain shut valve is arranged across an inlet port of a canister. The evaporative fuel-processing system has a function of detecting abnormalities in the evaporative control system and the fuel tank. The ECU detects an amount of evaporative fuel generated within the fuel tank, and inhibits the abnormality detection of the evaporative control system, when the amount of generated evaporative fuel exceeds a predetermined value.

Abstract: The invention is directed to a method and an arrangement for making a tank-venting diagnosis for a motor vehicle. The underpressure in a tank-venting apparatus is measured and tank venting is inhibited when a determination is made that a test condition is satisfied according to which a check is made as to whether a threshold underpressure is exceeded during a tank-venting phase. The method ensures that a tank-venting apparatus will not be damaged by an underpressure which is too high and which can occur when the venting arrangement of the adsorption filter of the apparatus is blocked or when a shutoff valve of the venting arrangement no longer opens.

Abstract: An apparatus for detecting a malfunction in an evaporated fuel purge system, includes a diagnosis control valve provided in an air inlet passage connecting an air inlet of a canister to the atmosphere, a pressure sensor provided at an intermediate portion of a vapor passage between a fuel tank and a purge control valve for sensing a pressure in the vapor passage, and a control part for controlling opening and closing operations of both the purge control valve and the diagnosis control valve.

Abstract: The present invention provides a system for detecting leaks in the evaporative emission control system utilized in automotive vehicles. Such control systems include a carbon filled canister having both a vent port and a fuel vapor port. The fuel vapor port, as well as a vapor line from the fuel tank, are connected through a purge valve to the intake manifold of the internal combustion engine. The present invention includes a vent valve which is fluidly connected with the canister vent port. An electronic control system closes both the vent valve and opens the purge valve thereby exposing the evaporative emission control system to the partial vacuum in the intake manifold. After a predetermined time period, the purge valve is closed thus entrapping the partial vacuum in the purge system while a pressure transducer thereafter monitors the partial vacuum in the purge system.

Abstract: A fuel tank and filler system for an internal combustion engine includes a fuel tank, a filler pipe extending into the fuel tank, and a check valve comprising a collapsible, normally open tube secured around the outlet of the fuel filler pipe within the tank. Fuel entering the tank passes through the filler pipe and collapsible tube unimpeded. The collapsible tube has sufficient flexibility, however, to collapse upon itself in the event that fuel begins to flow outwardly through the filler pipe, thereby preventing fuel from leaving the tank through the filler pipe.

Abstract: A malfunction sensing apparatus for a fuel vapor control system includes a fuel tank and a canister containing an adsorbent for adsorbing fuel vapor. The canister has an inlet connected to the fuel tank and an outlet. A purge control valve is connected to the outlet for connecting and disconnecting the outlet of the canister from the air intake pipe of an engine. A pressure sensor senses the internal pressure of the fuel tank. A malfunction sensing means responsive to the pressure sensor senses a malfunction when the purge control valve is open and the pressure sensed by the pressure sensor is above a prescribed value. A prohibiting means senses the rate of change and/or the magnitude of the pressure sensed by the pressure sensor with the purge control valve closed and prohibits malfunction sensing by the malfunction sensing means when the rate of change of the pressure exceeds a prescribed rate and/or the magnitude of the pressure exceeds a prescribed value.

Abstract: A device for controlling a fuel evaporative purge system having a solenoid valve arranged in a purge passage, comprises a unit for determining a maximum amount of fuel vapor to be purged, an air flow meter, a unit for calculating a maximum purging ratio of the maximum amount of fuel vapor to an amount of intake air, a unit for setting a purging ratio which is gradually varied during the purging process, and a unit for activating the solenoid valve. In the purging operation, the activating unit drives the valve at a duty-ratio identical to a ratio of the purging ratio to the maximum purging ratio.

Abstract: In accordance with one aspect of the present invention, an apparatus is provided for a vehicle equipped with a drive system and a controller for regulating the operating speed of the drive system. The apparatus includes at least one sensor for sensing a vehicle parameter and producing a parameter signal in response to the sensed parameter. A diagnostic device is provided for receiving the parameter signal, processing the parameter signal to detect the presence of an undesirable operating condition; determining the severity of the undesirable operating condition in accordance with a preselected strategy and responsively producing a severity level signal. The controller receives the severity level signal and limits the maximum speed of the vehicle in response to the severity level signal, whereby the maximum allowable vehicle speed decreases as the severity level signal increases.

Abstract: A malfunction detection apparatus for detecting a malfunction in an evaporative fuel purge system, which malfunction detection apparatus is able to suppress a fluctuation of an air-fuel ratio. A negative pressure inside an intake passage is introduced into the evaporative fuel purge system. The existence/nonexistence of a malfunction in the evaporative fuel purge system is determined by using pressure values inside the evaporative fuel purge system which values are detected and supplied by a pressure detecting unit. The apparatus is provided with an air-fuel ratio fluctuation suppressing unit for suppressing a fluctuation of the air-fuel ratio of air suctioned into an engine when introducing the negative pressure into the evaporative fuel purge system.

Abstract: A method for operating an closed-loop control system for injecting fuel into an internal combustion engine, with the control system having an error correcting capability for deviations that occur in the control signal being processed by the control system, and with the control system having a controlling element, which is embodied as a precontrol, PI-controller that are operated in parallel, and a non-volatile memory for storing deviation signals.

Abstract: A malfunction detection apparatus for detecting a malfunction in an evaporated fuel purge system in which fuel vapor from a fuel tank is adsorbed in an adsorbent in a canister and the adsorbed fuel vapor in the adsorbent is purged into an intake passage of an engine. The apparatus includes a detection part for detecting a concentration of fuel in the fuel vapor purged into the intake passage so that a change in the detected fuel concentration from a time when a purge cutting is performed to a time when a purging is performed after the purge cutting has been performed is detected, and a discrimination part for determining whether there is a malfunction in the system on the basis of the change in the detected fuel concentration by the detection part.

Abstract: A system is described to detect methane gas at oil well and natural gas well sites that will generate a warning signal when a first, lower concentration of methane gas is detected and will generate a second signal when a higher, more dangerous level of methane gas is detected. A methane monitoring control and sensor device is mounted within the environment of an internal combustion engine and is used to detect the concentration levels of methane gas and to generate two signals. A first signal will generate a warning, and a second signal will affect engine shutdown by means of a compressed air operated valve closing the air intake to the engine.

Abstract: Disclosed is an evaporative fuel purging apparatus used for an internal combustion engine. A canister having an absorbing agent for absorbing an evaporative fuel generated in a fuel tank of the internal combustion engine is provided. A drain control valve is provided on a drain port for opening the canister to the atmospheric air, and which is adapted to open and close the drain port. A purge control valve is provided on a purge passage communicating the canister to a part of an intake system, and which is adapted to purge the evaporative fuel absorbed into the canister through opening and closing the purge passage. A diagnostic device diagnoses the presence or absence of leakage in a purge system which is sealed up by closing the drain control valve and the purge control valve after pressure-reduction treatment.