Abstract: One aspect of a motor control device according to the present invention is a motor control device that controls a motor of an electric pump. The motor control device includes a drive unit that supplies a drive current to the motor; a control unit that controls a rotation speed of the motor by controlling the drive unit based on a rotation speed command value; and a current detection unit that detects the drive current supplied to the motor, and supplies a current detection value indicating a detection result of the drive current to the control unit. The control unit determines whether or not a foreign fluid suction abnormality occurs in the electric pump, based on a first current detection value acquired at a first timing when the rotation speed command value changes from a first command value to a second command value and a second current detection value acquired after the first timing.

Abstract: A method and system for correcting a fuel injection amount that injects fuel may include applying a current value for injecting a target fuel amount and injecting fuel under a driving condition in which fuel injection is blocked; determining a frequency analysis value for a pressure signal of the fuel pressure rail when the fuel is injected; determining a fuel amount difference corresponding to a difference value between the frequency analysis value and a reference frequency analysis value stored in a data storage in advance; and correcting a current value of the injector which is applied to inject the target fuel amount to remove the fuel amount difference.

Abstract: A fuel tank isolation valve (FTIV) is provided, configured for being disposed in fluid flow communication with a fuel tank and a carbon canister of a fuel system, the FTIV including an integrated controller and a solenoid coupled to a valve, the solenoid being movable between a normally closed position in which the valve is closed and prevents fluid communication through a first flowpath through the FTIV, and an open position in which the valve is open and allows for fluid communication through the first flowpath, the integrated controller being configured for generating actuation signals to the solenoid, responsive to parameter signals received from one or more sensors associated with the fuel tank. A sensing system for use with a fuel system is also provided, the sensing system including the FTIV and at least one such sensor. A fuel system is also provided, including a fuel tank and a carbon canister, and also including the sensing system for use therewith.

Abstract: A method of conducting an engine power assurance check includes performing a first engine power assurance check wherein the first engine power assurance check is judged as passing or failing based on power performance values calculated assuming the presence of a substantially clogged or blocked inlet barrier filter and in response to a fail result of the first engine power assurance check, performing a second engine power assurance check wherein the second power assurance check is judged as passing or failing based on power performance values calculated assuming at least one of no inlet barrier filter being installed and an open bypass of an installed inlet barrier filter.

Abstract: An embodiment includes a method of monitoring a fluid pump that includes receiving time domain measurement data indicating vibrations occurring in a fluid pump, and filtering the measurement data to remove measurement data components having frequencies below a threshold frequency, the removed measurement data components associated with cyclical motions of the fluid pump. The method also includes dividing the filtered measurement data into a plurality of subsets, each subset corresponding to a pump cycle, and estimating a peak count for each subset, the peak count being a number of peaks having an amplitude that exceeds a selected amplitude threshold, the amplitude threshold associated with impacts between internal components of the pump. The method further includes comparing the peak count with an expected peak count, and determining whether the pump is in a condition selected from at least one of a wear condition and a failure condition based on the comparison.

Abstract: Methods and systems are provided for diagnosing functionality of a vehicle fuel system and a vehicle evaporative emissions system, and one or more components thereof, subsequent to refueling a vehicle fuel tank, and wherein the refueling event may comprise a remote refueling event. In one example, after completion of the refueling event, the fuel system and evaporative emissions system are sealed from atmosphere and from each other, and pressure is monitored in both the fuel system and evaporative emissions system in order to indicate the presence or absence of undesired evaporative emissions in both the fuel system and evaporative emissions system, and to indicate whether the fuel system is effectively sealed from the evaporative emissions system. In this way, costs associated with vehicle repair may be decreased, and undesired evaporative emissions to the atmosphere may be reduced.

Abstract: Methods and systems are provided for reducing evaporative emissions from a vehicle by performing a fine leak test at a vehicle assembly plant. Fuel tank pressure generated after a green tank fueling event is monitored as the vehicle moves along an assembly line. A leak is determined based on a rate of pressure bleed-up over the duration, and accordingly the vehicle is directed to a repair station.

Abstract: Disclosed is an apparatus for bypassing and testing a fuel pump relay for a fuel pump of a vehicle. In an aspect, the apparatus includes a first pair of terminal pins configured to be inserted into the run/start signal fuse slot in the fuse box of the vehicle, a second pair of terminal pins configured to be inserted into a fuel pump fuse slot in the fuse box of the vehicle, a power input device configured to be conductively coupled to a power source of the vehicle, and a circuit configured to conductively couple, based on reception of electrical current from a run/start signal out terminal pin of the first pair of terminal pins, the power input device to a fuel pump terminal pin of the second pair of terminal pins to provide electrical current from the power input device to the fuel pump of the vehicle.

Abstract: A control device for an internal combustion engine is equipped with an electronic control unit. The electronic control unit is configured to: i) calculate amplitudes of respective waves, respectively, originating from a plurality of factors that causes fuel pressure pulsation within a low-pressure fuel passage, vibration frequencies of the respective waves within a crank angle range of 360 degrees, initial phases of the respective waves, and central fuel pressure values of the respective waves; and ii) predict a fuel pressure value at an arbitrary crank angle according to a model formula showing a synthesized wave obtained by synthesizing the respective waves, on a basis of the amplitudes, the vibration frequencies, the initial phases, and the central fuel pressure values of the respective waves calculated.

Abstract: Methods and systems are provided for managing fuel vapor in a vehicle evaporative emissions system configured with a fuel vapor canister for capturing and storing vapors from a vehicle fuel tank. In one example, a three-way valve is positioned between the fuel vapor canister and atmosphere, and may function during engine-off conditions to direct fuel tank vapors through the fuel vapor canister where they may be adsorbed, and then to an intake manifold of the engine where a second adsorbent for capturing and storing fuel vapors is positioned. In this way, fuel vapors that are not adsorbed by the fuel vapor canister, or fuel vapors that are freed from the canister during engine-off conditions may be routed to the second adsorbent prior to exiting to atmosphere, thus reducing undesired bleed emissions.

Abstract: Systems and methods for performing evaporative emissions leak detection in a vehicle are provided. In one embodiment, a method comprises initiating a leak test via an electronic controller in a vehicle responsive to selected route conditions. In this way, a leak test may run without premature termination, therefore saving resources.

Abstract: A method for checking an assembly wrench, having an integrated angular measuring device, includes: fixing the assembly wrench in a rotatable fixing device; activating the angular measuring device integrated in the assembly wrench; rotating the fixing device by at least one specified angle; reading off the angle of rotation measured by the angular measuring device integrated in assembly wrench; and comparing the angle of rotation measured by the angular measuring device integrated in the assembly wrench to the specified angle, by which the fixing device has been rotated.

Abstract: Methods and systems are provided for performing fuel tank pressure sensor rationality for a hybrid electric vehicle during refueling. In one example, a method may include indicating degradation of the fuel tank pressure sensor based on the pressure detected in the canister vent line when the canister vent line is restricted.

Abstract: A first housing has a canister passage communicating a first interior with a canister. A second housing has an atmospheric passage communicating a second interior with an atmosphere. A switching valve is accommodated in the first housing to switch communication of the canister passage with selectively one of a pressure detection passage and the atmospheric passage. A switching valve bypass passage communicates the canister passage with the pressure detection passage and bypasses the switching valve. A partition member separates the first interior from the second interior and has a communication hole communicating the first interior with the second interior. A contact member is equipped to an end of the partition member and is in contact with at least one of the first housing and the second housing. The partition member forms a clearance with the first housing and the second housing.

Abstract: A vaporized fuel processing apparatus has a fuel tank, a canister configured to adsorb vaporized fuel, a vapor path connecting the canister to the fuel tank, a closing valve provided in the vapor path, a pressure sensor measuring inner pressure of the fuel tank, and an electric control unit connected with the closing valve and the pressure sensor. The electric control unit is configured to close or open the closing valve in order to initialize the closing valve or open the closing valve in order to release the vaporized fuel from the fuel tank. Further, the electric control unit is configured to detect failure of the closing valve depending on change in the inner pressure of the fuel tank within a predetermined time from when the closing valve is opened or is closed for initialization of the closing valve or release of the vaporized fuel from the fuel tank.

Abstract: A test stand for testing a fluid injection pump and/or a fluid injector has a device for conditioning a test fluid used for the testing. The device has a tank to accommodate and store the test fluid, a first fluid removal line to withdraw test fluid from the tank and to convey it to the fluid injection pump, and a cooling circuit for cooling the test fluid stored inside the tank. The cooling circuit has a second fluid removal line and a return line. The fluid removal line is to withdraw test fluid from the tank and is connected to a heat exchanger, which cools the test fluid withdrawn from the tank. The return line is connected to the heat exchanger and returns the test fluid from the heat exchanger back into the tank.

Abstract: A leakage diagnosis apparatus is applied to an evaporated-gas purge system including a negative-pressure sensor and a pressure detecting portion. The negative-pressure sensor introduces a negative pressure into an evaporation system. The pressure detecting portion detects the pressure in the evaporation system. The leakage diagnosis apparatus includes a leakage-diagnosis portion and a determining portion. The leakage-diagnosis portion executes a leakage diagnosis to determine whether a leakage of the evaporation system is generated. The determining portion determines whether an evaporated-gas amount in the evaporation system is in an excessive state while the internal combustion engine is stopped. The leakage-diagnosis portion prohibits or terminates the leakage diagnosis, when the determining portion determines that the evaporated-gas amount is in the excessive state.

Abstract: A turbine liquid fuel simulator exposes the components of a liquid fuel system in a turbine engine to the same fuel flows and pressures that the liquid fuel system would endure in an actual startup and run sequence, without burning or otherwise emitting the liquid fuel from the system. A fuel porting mechanism, such as a direction control valve, is installed in each combustor of the turbine engine. The fuel porting mechanism is movable from a first position, wherein liquid fuel is delivered to the combustor nozzle to be burned in normal operation, to a second position, wherein the liquid fuel is diverted to return lines that deliver the liquid fuel back to the fuel tank. To simulate the actual pressures and flows, pressure differential orifices can be installed in the return fuel lines. The orifices includes structures that modify the liquid fuel flow to mimic delivery to the nozzle.

Abstract: A method for monitoring a fuel pressure in a fuel injection system of an internal combustion engine. A setpoint fuel pressure is initially set in the fuel injection system. Next, a first fuel injection and a subsequent second fuel injection are executed at a time interval shorter than a decay time of a pressure wave in the fuel injection system, triggerable by the first fuel injection. In an additional step, a monitored fuel injection quantity, which is injected via the second fuel injection, is ascertained. An action is executed if the monitored fuel injection quantity differs from a setpoint fuel injection quantity, which is predefinable for the setpoint fuel pressure, by more than a limiting value. The invention also relates to a computer program product for executing the method and to a device for monitoring a fuel pressure in a fuel injection system of an internal combustion engine.

Abstract: An ECU executes a program including the steps of: executing fuel-cut control when an IG OFF operation has been performed and a vehicle is traveling; determining torque command values of a first MG and a second MG when a charge power upper limit value Win is reduced; controlling the first MG based on the determined torque command value of the first MG; and controlling the second MG based on the determined torque command value of the second MG.

Abstract: A method for determining if an injector (10) is in a blocked state, the injector including a coil of resistance R and of inductance L, passed through by a power supply current of maximum intensity (Imax), and powered by a voltage E, the method includes: controlling the opening of the injector, measuring the intensity I passing through a measurement resistance r as a function of time t, determining a necessary duration ? to reach a predetermined intensity value (Ipred), lower than the maximum intensity (Imax), computing the inductance L as a function of the necessary duration, if L?Lth, then the injector is blocked in the closed position, otherwise if L<Lth, the injector is blocked in the open position, with Lth being a threshold value of the inductance.

Abstract: A device for detecting a fault in a low-pressure fuel pump of a turbojet. The pump is driven by an accessory gearbox including a gear for mechanically driving the accessories. The device measures the vibration frequencies of the accessory gearbox and detects, from among the frequencies, at least one vibration frequency of the low-pressure fuel pump. The device allows a fault in the low-pressure fuel pump to be detected as soon as it occurs.

Abstract: A diagnostic test is conducted by operating an engine-generator set at a plurality of reduced speeds. At each of those speeds, operating parameters of the engine are sensed and analyzed to detect an unsatisfactory operating condition. For example, such operating parameters may include speed of the engine-generator set, engine oil pressure and level, engine temperature, coolant level, and battery voltage. When a transition in engine speed occurs, a throttle test also may be conducted to measure how quickly and smoothly the engine reaches the new speed. After the engine reaches the normal operating speed, the generator is activated to produce electricity. One or more characteristic of that electricity, such as voltage, current and frequency, are sensed and evaluated to detect an unsatisfactory operating condition.

Abstract: A system for a vehicle includes a first pressure module and a blockage indication module. The first pressure module receives a signal from a pressure sensor that measures pressure within a fuel vapor purge system. The first pressure module generates a first pressure based on the signal at a first time and generates a second pressure based on the signal at a second time. The second time is after the first time. The blockage indication module indicates whether a blockage is present in the fuel vapor purge system between the pressure sensor and a fuel tank based on a difference between the first and second pressures.

Abstract: Disclosed is a technique for ranking a driver's fuel efficiency among other drivers based on various variables associated with the environment in which the vehicle is being driven. More particularly, the present invention, selects, as a category, one or more factors affecting fuel efficiency, and, as one or more, variables another one or more. Vehicle data is then collected by a communications device which is associated with a particular trip. Next an average of the fuel efficiencies and an average of the variables for the trip are calculated accordingly the selected one more categories. The fuel efficiency of the trip corresponding to a same category for every coordinate point of the variable is then statistically processed to calculate the average of the fuel efficiency and the standard deviation of the fuel efficiency and regularized (processed as a GAP calculation) to determine the ranking of a vehicle driver.

Abstract: A method for detecting and isolating an actual fault in a fuel delivery system having a fuel pump and a fuel pump motor, includes monitoring fuel pressure, pump current, and pump voltage. Each of a plurality of fault triggers are designated as one of flagged and un-flagged based on at least one of the fuel pressure, the pump current and the pump voltage. The actual fault in the fuel delivery system is isolated from a plurality of possible faults when a condition respective to one of the possible faults is satisfied based on at least one of the plurality of fault triggers designated as flagged and un-flagged.

Abstract: A test system of a fluid pump which has a pump includes a test fixture which supports the fluid pump, a fluid flow path, and a connecting pipe arranged at the test fixture and having one end side connected to a discharge port of the pump and the other end side connected to the fluid flow path. The connecting pipe has a main pipe member, a movable pipe member arranged slidably inside the main pipe member and having an end which is positioned sticking out from the main pipe member, and a seal clamp provided at an end of the movable pipe member. When the movable pipe member receives fluid pressure inside of the main pipe member, the seal clamp which is pushed against the discharge port of the pump holds the discharge port of the pump liquid-tightly.

Abstract: An object of the invention is to provide a fuel-aspect sensor having higher detection accuracy. A first electrode is inserted into a hole formed in a first housing member. A cylindrical second electrode is inserted into and firmly fixed to the first electrode by a cylindrical insulating member. A first elastic member, for example, made of rubber, is arranged between the first electrode and a second housing member. The first electrode has a large-diameter portion, which is biased by the first elastic member toward a sealing surface formed on an inner wall of the hole, so as to fluid-tightly seal a space between the first electrode and the second housing member.

Abstract: A method of monitoring operation of a fuel system includes urging a fuel flow from a fuel source toward a pressure regulating valve via a fuel pump. A pressure of the fuel flow is detected at the pressure regulating valve, and a pump speed required to produce a selected pressure at the pressure regulating valve is detected. The pump speed is compared to a range of acceptable pump speeds, and an operational status of the fuel pump is determined based on a result of the comparison.

Abstract: A method for detecting and isolating an actual fault in a fuel delivery system having a fuel pump and a fuel pump motor, includes monitoring fuel pressure, pump current, and pump voltage. Each of a plurality of fault triggers are designated as one of flagged and un-flagged based on at least one of the fuel pressure, the pump current and the pump voltage. The actual fault in the fuel delivery system is isolated from a plurality of possible faults when a condition respective to one of the possible faults is satisfied based on at least one of the plurality of fault triggers designated as flagged and un-flagged.

Abstract: A test station for testing a fluid pump and/or a fluid injector has a fluid-pump receiving device for accommodating a fluid pump, a fluid-injector receiving device for accommodating a fluid injector, a fluid line which hydraulically connects the fluid-pump receiving device to the fluid-injector receiving device and which enables a fluid flow from the fluid pump to the fluid injector during operation, a sealed cooling circuit through which coolant is circulating during operation, and a first heat exchanger, which is developed and disposed in the fluid line so as to have the fluid flow and the coolant flow pass through it during operation such that a heat transfer takes place between the fluid flow and the coolant flow.

Abstract: A test system of a fluid pump which has a pump includes a test fixture which supports the fluid pump, a fluid flow path, and a connecting pipe arranged at the test fixture and having one end side connected to a discharge port of the pump and the other end side connected to the fluid flow path. The connecting pipe has a main pipe member, a movable pipe member arranged slidably inside the main pipe member and having an end which is positioned sticking out from the main pipe member, and a seal clamp provided at an end of the movable pipe member. When the movable pipe member receives fluid pressure inside of the main pipe member, the seal clamp which is pushed against the discharge port of the pump holds the discharge port of the pump liquid-tightly.

Abstract: A method and apparatus for identifying a component failure within a thermal regenerator operates as follows. The burner control unit monitors at least one of a fuel pump characteristic for a fuel pump and an ignition system characteristic for an ignition system. The fuel pump is used to supply fuel to a fuel-fired burner and the ignition system is used to ignite fuel supplied to the fuel-fired burner. The fuel pump characteristic is communicated to the burner control unit which compares the fuel pump characteristic to a predetermined fuel pump criteria. The ignition system characteristic is communicated to the burner control unit which compares the ignition system characteristic to a predetermined ignition system criteria. The burner control unit identifies a fuel pump failure when the fuel pump characteristic does not meet the fuel pump criteria, and identifies an ignition system failure when the ignition system characteristic does not meet the ignition system criteria.

Abstract: A method and an apparatus for testing the piston (2) of an injection pump of a pressure medium, the piston comprising a longitudinal groove (2b) that begins from its frontal face (2a) and extends on its side, and a screw-shaped guide edge (2c) that abuts on the envelope surface of the piston. According to the invention, the piston (2) is inserted, with its frontal face (2a) first, into a testing cylinder (1), wherein the clearance between the piston (2) and the testing cylinder (2) is tight and wherein a specific testing pressure is exerted on the envelope surface of the piston, in a limited area, from the vicinity of the said guide edge (2c) to a selected measurement point. The piston (2) is moved in the testing cylinder (1), so that the said measurement point moves, following the guide edge (2c). Changes in the testing pressure are monitored to observe any failures in the piston (2) and the said guide edge (2c).

Abstract: In a method for determining a controlled variable of pressure control of a high-pressure accumulator of an injection system, a setpoint pressure gradient value is determined in the high-pressure accumulator as a function of the maximum possible actual pressure gradient value.

Abstract: A device for detecting a fault in a low-pressure fuel pump of a turbojet. The pump is driven by an accessory gearbox including a gear for mechanically driving the accessories. The device measures the vibration frequencies of the accessory gearbox and detects, from among the frequencies, at least one vibration frequency of the low-pressure fuel pump. The device allows a fault in the low-pressure fuel pump to be detected as soon as it occurs.

Abstract: A water jet propulsion boat is constructed such that a fuel pressure detection device is free from a detection error or breakdown and a restart ability of an engine is protected against malfunction. A fuel tank is provided in a boat body of the water jet propulsion boat through vibration absorbing members. A fuel pump unit including a fuel pump is provided in the fuel tank. A fuel pressure sensor is provided in the fuel pump unit. An electric control device stops the fuel pump if the value detected by the fuel pressure sensor is out of the normal value range. Additionally, an electric control device stops operation of the fuel pump if the fall sensor detects the overturning of the boat body and if the detected value of the fuel pressure sensor is out of the normal value range. A regulator and a filter are provided to the fuel pump unit.

Abstract: A procedure for determining the proportion of components of a fuel mixture, which is boosted with a fuel pump, and a device for implementing the procedure are suggested. A measure for the power input of the fuel pump is detected, with whose aid the proportion of components of the fuel mixture is determined. By proceeding according to the invention a special sensor, which is susceptible to components of the fuel mixture can be waived.

Abstract: A system and method for testing the operation of fuel pump is disclosed. The apparatus includes a pressure measurement portion, a flow measurement portion, an electrical diagnostic portion, and a fault simulation portion, where a user can simulate a number of potential fuel system failures to determine the diagnostics of the fuel system. The method includes the steps of measuring an electrical value related to the fuel pump, measuring a pressure related to the fuel pump, measuring a fuel flow related to the fuel pump, simulating a fuel system failure condition, and determining an operating status of the fuel pump.

Abstract: A method for detecting abnormality in a fluid supply line is provided that uses a fluid control apparatus with a pressure sensor so that abnormality of malfunction and sheet leaks of a plurality of valves incorporated into the fluid supply line can be checked easily, promptly and accurately by operating the flow rate control apparatus possessing the pressure sensor. Specifically, using a fluid supply line provided with the flow rate control apparatus possessing the pressure sensor equipped with a flow rate setting mechanism, a flow rate/pressure display mechanism, and/or a flow rate self-diagnosis mechanism, abnormality of the control valves, installed with the flow rate control apparatus and on the upstream side and downstream side thereof, is detected by using the pressure value displayed and/or the value diagnosed with a self-diagnosis mechanism of the flow rate control apparatus.

Abstract: A method and apparatus for identifying a component failure within a thermal regenerator operates as follows. The burner control unit monitors at least one of a fuel pump characteristic for a fuel pump and an ignition system characteristic for an ignition system. The fuel pump is used to supply fuel to a fuel-fired burner and the ignition system is used to ignite fuel supplied to the fuel-fired burner. The fuel pump characteristic is communicated to the burner control unit which compares the fuel pump characteristic to a predetermined fuel pump criteria. The ignition system characteristic is communicated to the burner control unit which compares the ignition system characteristic to a predetermined ignition system criteria. The burner control unit identifies a fuel pump failure when the fuel pump characteristic does not meet the fuel pump criteria, and identifies an ignition system failure when the ignition system characteristic does not meet the ignition system criteria.

Abstract: A lift mechanism diagnostic system comprises a fuel pump disabling module, a pressure module, and a diagnostic module. The fuel pump disabling module selectively disables a fuel pump that is driven by a camshaft. The pressure module determines a first pressure of fluid provided to a variable valve lift mechanism when the variable valve lift mechanism is operated in a first lift mode while the fuel pump is disabled and determines a second pressure of the fluid when the variable valve lift mechanism is operated in a second lift mode while the fuel pump is disabled. The diagnostic module selectively diagnoses a fault in the variable valve lift mechanism based on the first and second pressures.

Abstract: An abnormality detection device of a fuel pump reduces costs and prevents detection error or breakdown by making the fuel pressure sensor unnecessary. The abnormality detection device includes an abnormality detection circuit, a fuel pump driving voltage detection unit to detect the voltage value of an abnormality detection circuit, and a meter. The abnormality detection circuit is constituted by the circuit including a resistance disposed between a battery side of the fuel pump motor to drive the fuel pump and a ground side. If the voltage value detected by the fuel pump driving voltage detection unit is larger than the upper limit or lower than the lower limit of the normal range, the warning lamp of the meter flashes and a buzzer makes an alarm sound. The abnormality detection circuit is housed in the fuel pump module disposed in the fuel tank.

Abstract: A method and an apparatus for testing the piston (2) of an injection pump of a pressure medium, the piston comprising a longitudinal groove (2b) that begins from its frontal face (2a) and extends on its side, and a screw-shaped guide edge (2c) that abuts on the envelope surface of the piston. According to the invention, the piston (2) is inserted, with its frontal face (2a) first, into a testing cylinder (1), wherein the clearance between the piston (2) and the testing cylinder (2) is tight and wherein a specific testing pressure is exerted on the envelope surface of the piston, in a limited area, from the vicinity of the said guide edge (2c) to a selected measurement point. The piston (2) is moved in the testing cylinder (1), so that the said measurement point moves, following the guide edge (2c). Changes in the testing pressure are monitored to observe any failures in the piston (2) and the said guide edge (2c).

Abstract: The invention provides a method for determining the angular position of a pump shaft relative to a pump body. The method comprises: providing the pump shaft with a first locating feature; providing the pump shaft with a second locating feature; providing a measurement device provided with a measurement member; engaging the measurement member with the first locating feature and determining a first distance between the first locating feature and a reference feature provided on the measurement device; engaging the measurement member with the second locating feature and determining a second distance between the second locating feature and a reference feature provided on the measurement device; and determining the difference between the first and second distances to provide an indication of the angular position of the pump shaft relative to the pump body. The invention also provides apparatus suitable for performing the above method.

Abstract: An engine control system includes a driver module and a diagnostics module. The driver module includes a high-side driver and a low-side driver, which selectively actuate a load. The driver module generates status signals based on detection of each of a plurality of failure modes of the high-side and low-side drivers. The diagnostics module increments a first error count for a first mode of the plurality of failure modes when the status signals indicate the driver module has detected the first mode. The diagnostics module increments a corresponding total count each time the driver module analyzes the first mode. The diagnostics module sets a fail state for a diagnostic trouble code (DTC) when the first error count for the first mode reaches a first predetermined threshold prior to the total count reaching a second predetermined threshold.

Abstract: A lift mechanism diagnostic system comprises a fuel pump disabling module, a pressure module, and a diagnostic module. The fuel pump disabling module selectively disables a fuel pump that is driven by a camshaft. The pressure module determines a first pressure of fluid provided to a variable valve lift mechanism when the variable valve lift mechanism is operated in a first lift mode while the fuel pump is disabled and determines a second pressure of the fluid when the variable valve lift mechanism is operated in a second lift mode while the fuel pump is disabled. The diagnostic module selectively diagnoses a fault in the variable valve lift mechanism based on the first and second pressures.

Abstract: This invention provides an electric fuel pump tester that allows a technician to simulate the real-life operation of the electrical system of the vehicle, i.e., when the fuel pump is installed. The present invention provides a tester that includes a load that is similar to that of an installed fuel pump. In this manner, a technician may monitor simulated real-life operation of the vehicle's electrical system.

Abstract: Methods and apparatus are disclosed for detecting whether a gear-driven fuel pump has been installed correctly in a fuel injected IC engine, the pump gear being driven by an engine gear to provide fuel to injectors via a fuel rail. The method may include providing a pump element pumping event. The method may also include disabling overlapping fuel injectors and overlapping pumping events during the test period surrounding the selected pumping event, and measuring the pressure in the rail during the pumping event with the overlapping injectors disabled, the at least two different engine crank angles surrounding the pumping event. The method also may further include determining from the measured rail pressures whether the pumping event occurred at a desired engine crank angle. Apparatus to carry out the methods may include a computer programmed for controlling the sequence of the providing, disabling, measuring, and determining functions, as well as software for carrying out the respective functions.

Abstract: Methods and apparatus are provided for testing a fuel pump in a fuel supply system on a IC fuel injected engine, the pump having a pumping element for supplying fuel injectors via a fuel rail. The method includes providing a pump element pumping event; disabling overlapping injectors during a test-period that includes the pumping event; measuring pressure in the rail at least two engine crank angles surrounding the pumping event during the test period; and determining a fuel delivery rate value for the pump based on the measured rail pressures. Methods and apparatus also are provided for determining quantitative leakage rate in the fuel supply system of a fuel injected IC engine, the fuel system including a fuel pump with one or more pumping elements supplying injectors via a fuel rail.