Abstract: A method of operating a rotary engine including a rotor engaged to a shaft and rotationally received in a housing to define a plurality of working chambers of variable volume, including delivering a pilot quantity of fuel into a pilot cavity in successive communication with the working chambers, igniting the pilot quantity of fuel within the pilot cavity, and delivering a main quantity of fuel into the working chambers downstream of the successive communication of the pilot cavity with the working chambers, where at least one of the pilot quantity and the main quantity is varied between successive rotations of the shaft.

Abstract: A controller for an internal combustion engine includes a fuel introduction process of introducing an air-fuel mixture containing fuel injected by a fuel injection valve into an exhaust passage without burning the air-fuel mixture in a cylinder. The fuel introduction processor is configured to perform, during the execution of the fuel introduction process, a determination process of determining whether afterfire, in which the air-fuel mixture burns at an upstream side of a three-way catalyst device in the exhaust passage, has occurred and a stopping process of stopping the fuel introduction process when determining in the determination process that the afterfire has occurred.

Abstract: An information transmission system includes a communication connection device and a server. The communication connection device includes a use determination unit, a first communicator, a second communicator, and a communication control unit. The use determination unit determines whether a movable object is in use. The second communicator communicates with the server for a larger volume of data than the first communicator at a time, or communicates with the server more frequently than the first communicator. The communication control unit causes the second communicator to transmit, selectively from transmission information, specific transmission information including predefined movable object information to the server when the use determination unit determines that the movable object is not in use and the second communicator is enabled to communicate with a communication base station.

Abstract: Methods and systems are provided for learning fuel injector error for cylinder groups during a deceleration fuel shut-off (DFSO), where all cylinders of an engine are deactivated, sequentially firing each cylinder of a cylinder group, each cylinder fueled via consecutive first and second fuel pulses of differing fuel pulse width from an injector. Based on a lambda deviation between the first and second pulses, a fuel error for the injector and an air-fuel ratio imbalance for each cylinder is learned. Alternatively or additionally, a difference in crankshaft acceleration between the first and second pulses relative to the expected deviation may be used to learn torque error, and adjust fuel injector error and air-ratio imbalance for each cylinder.

Abstract: There is provided a controller for an internal combustion engine that includes an exhaust gas recirculation device. The exhaust gas recirculation device includes an exhaust gas recirculation passage, which connects a portion of the intake passage located at a downstream side of the throttle valve with an exhaust passage, a recirculation valve, which opens and closes the exhaust gas recirculation passage, and an actuator, which drives and opens the recirculation valve. The controller includes a processor configured to execute a fuel cut-off process that stops fuel injection from the fuel injection valve, to open the recirculation valve when the fuel cut-off process is executed, and to execute a pressure increase process that increases pressure of the portion of the intake passage at the downstream side of the throttle valve before opening the recirculation valve.

Abstract: A computer-assisted inspection system provides computer architectures and software controlled algorithms to automatically provide vehicle inspections and repair recommendations including estimated repair time and cost of depression type damage such as dents. Features provided by a handheld wireless touchscreen based inspection device include flat car part picking, auto grading including seller grading, and automatic calculation of body and bumper dent repair parameters and directions.

Abstract: A system and method for monitoring a gas station can be used to prevent deceptive practices, such as a gas station that deceives a refueling amount or supplies inferior fuel. The gas station monitoring system includes: at least one telematics terminal that collects refueling information and transmits the refueling information to the outside; a credit card company server that transmits payment information of a gas station to the outside; a traffic information providing server that transmits traffic information including a position of the gas station to the outside; and a telematics server that determines the gas station to be a dishonest gas station that deceives a refueling amount by comparing information that is transmitted from the at least one telematics terminal and the payment information.

Abstract: In one aspect of the invention, an engine is operated in a skip cylinder engine braking mode. In the skip cylinder engine braking mode, selected working cycles of selected working chambers are deactivated. Other selected working cycles of the selected working chambers are operated in a braking mode. Accordingly, individual working chambers are sometimes deactivated and sometimes operated in the braking mode while the engine is operating in the skip cylinder engine braking mode. Various methods for cylinder control are described, which improve fuel economy, catalytic converter performance, and vehicle NVH characteristics.

Abstract: An exhaust system including a selective catalytic reduction (SCR) component and an oxidation catalyst component. The exhaust system also includes an exhaust treatment fluid injection system for dispersing an exhaust treatment fluid into an exhaust stream at a location adjacent either the SCR component or the oxidation catalyst component, wherein the exhaust treatment fluid injection device includes a common rail that provides the exhaust treatment fluid under pressure to a plurality of injectors that dose the exhaust treatment fluid into the exhaust stream. The exhaust treatment fluid injection device also includes a return rail for returning unused exhaust treatment fluid to the fluid source. Each of the common rail and return rail can be configured to allow drainage of the exhaust treatment fluid as a freeze-protection feature.

Abstract: A vehicle air conditioner control system has an air conditioning device for performing a refrigerating cycle, having a compressor that intakes, compresses, and discharges a refrigerant, a condenser that condenses the refrigerant discharged from the compressor, an expansion valve that depressurizes the refrigerant condensed by the condenser, an evaporator that performs heat exchange between open air and the refrigerant to vaporize the refrigerant, a compressor ON/OFF control device that controls a running rate of the compressor by alternating between an ON state and an OFF state, a vehicle deceleration fuel cut-off executing device that performs cut-off fuel supply during vehicle deceleration, and a fuel supply recovery executing device that cancels fuel cut-off and recovers fuel supply during vehicle deceleration fuel cut-off period based on a demand to turn on the compressor.

Abstract: Disclosed are an apparatus and a method for processing a fuel cut starting or releasing the fuel cut using a tilt angle of a vehicle or a clearance angle of an acceleration pedal. An exemplary embodiment of the present invention can reflect driving habit or acceleration intention of a driver by interlocking a clearance angle of the acceleration pedal in addition to starting or releasing a fuel cut according to a tilt angle of a vehicle, thereby increasing fuel efficiency driving or convenience of driving. The exemplary embodiment of the present invention can improve stability of driving by applying a haptic technology.

Abstract: In a vehicle in which an output of an engine is transmitted to a driving wheel through a transmission, an engine control device stops fuel injection of the engine, when engine rotational speed is above a preset specific fuel cut-off rotational speed while the vehicle is coasting; and restarts the fuel injection, when the engine rotational speed falls below a recovery rotational speed while the fuel injection is stopped, wherein the recovery rotational speed is below the specific fuel cut-off rotational speed. When determining that an operating state allows the stop and restart of fuel injection to be repeated, the engine control device sets a hunting-preventing fuel cut-off rotational speed based on an input shaft rotational speed of the transmission, wherein the hunting-preventing fuel cut-off rotational speed replaces the specific fuel cut-off rotational speed.

Abstract: A control for an internal combustion engine having a fuel injection valve for directly injecting fuel to a combustion chamber of the engine, an ignition device for burning an air-fuel mixture containing the fuel injected from the fuel injection valve, and a variable cylinder management mechanism that is capable of changing the number of operating cylinders is provided. The control includes making a transition to an operating mode where the number of operating cylinders is decreased through the variable cylinder management mechanism. It is predicted based on an operating condition of the engine that an air-fuel ratio of an exhaust atmosphere of the engine becomes lean due to a stop of the fuel injection into one or more cylinders to be halted by the transition.

Abstract: An internal combustion engine is provided with a fuel injector which injects fuel into an intake port and exhaust variable valve timing mechanism which changes a valve timing of an exhaust valve. A control device executes early exhaust valve closing control which advances a closing timing of an exhaust valve when conditions for executing early exhaust valve closing control stand. The control device detects an output torque output by an engine body. At the time of deceleration of the engine, even when the condition for executing early exhaust valve closing control stands, execution of early exhaust valve closing control is prohibited when it is predicted that the output torque will become smaller than the limit torque. Thus, due to execution of the early exhaust valve closing control, a large torque fluctuation is prevented from occurring at the time of deceleration of the engine.

Abstract: A control device for an internal combustion engine is provided. The control device includes means which controls fuel injection by a fuel injection device, and means which controls the throttle. The fuel injection control means sequentially restarts fuel injection for each cylinder in accordance with an ignition sequence among cylinders when cancellation conditions of fuel cut are satisfied during implementation of the fuel cut. Meanwhile, the throttle control means firstly controls the throttle to a closing side when the cancellation conditions of fuel cut are satisfied. The throttle is controlled to the closing side, whereby the air amount in the intake pipe is decreased, and the air amount in a cylinder which is the basis of calculation of a fuel injection amount is also decreased.

Abstract: In order to determine the quality of fuel in an auto-igniting internal combustion engine, a defined fuel amount is injected at defined crank shaft angles during a deceleration fuel shut-off phase of the internal combustion engine. The thereby created crankshaft torque contribution is detected and an absolute or relative measure is determined for the fuel quality thereof.

Abstract: A control system of an internal combustion engine in which a first fuel of ammonia and a second fuel which is easier to burn than ammonia are used as fuels. An ammonia ratio is usually set to a reference ammonia ratio which is determined in advance in accordance with an operating state of an engine. At the time when feed of the fuel is restarted after suspension of feed of the fuel at the time of deceleration, the ammonia ratio is temporarily made lower than the reference ammonia ratio in accordance with the operating state of the engine.

Abstract: There is provided, in one aspect of the present description, a method of controlling a spark ignited internal combustion engine having a fuel injector which injects fuel directly into its combustion chamber. The method comprises stopping the fuel injection if a desired torque for the engine is a predetermined torque or less and a speed of the engine is a predetermined speed or greater. The method comprises resuming the fuel injection by injecting a first amount of fuel directly into the combustion chamber during a negative pressure period and injecting a second amount of the fuel into the combustion chamber during an intake period. The method further includes resuming the fuel injection by injecting a third amount of the fuel directly into the combustion chamber during the negative pressure period and injecting a fourth amount of the fuel into the combustion chamber during the intake period.

Abstract: A fuel injection control apparatus is provided with a supply control section, a stop control section, a timing estimating section and a torque recovery control section. The supply control section controls fuel supplied to an engine based on a detected prescribed vehicle running state. The stop control section stops supplying fuel upon detecting a first prescribed vehicle running state. The timing estimating section estimates a timing at which a drive train transmitting a drive force from the engine to a wheel will change from a non-drive state in which the engine rotates due to a force from the wheel to a drive state in which the wheel rotates due to a drive force of the engine. The torque recovery control section resumes supplying fuel upon detecting a second prescribed vehicle running state and stops resumption of fuel being supplied for a prescribed amount of time based on the timing.

Abstract: A direct-injection, compression-ignition internal combustion engine control adapts nominal minimum pulsewidth parameters controlling the fuel injectors to minimize pilot fuel delivered to the cylinders required to initiate a preliminary combustion event.

Abstract: The invention is directed to the improvement of starting performance in an engine rotational speed region that exceeds an idle rotation region without affecting normal traveling performance. At the time when a vehicle starts moving, when in an electronic control unit, the rotational speed of an engine is in a predetermined range that exceeds an idle rotation region and the engine rotational speed decreases, the electronic control unit adds a corrected fuel injection amount corresponding to the rate of decrease to a target fuel injection amount to create a new target fuel injection amount. When the rotational speed of the engine increases, the electronic control unit subtracts a corrected fuel injection amount corresponding to the rate of increase of the engine rotational speed from a target fuel injection amount to create a new target fuel injection amount. Control of the output of the engine is performed by the electronic control unit.

Abstract: A control system for an internal combustion engine for driving a vehicle, which controls an output torque of the engine, is provided. In this control system, a rapid change in a demand torque of the engine is detected, and a feedforward correction amount is generated during a correction period which is substantially equal to a resonance period of a powertrain of the vehicle, from a time when the rapid change in the demand torque is detected. An output torque control amount of the engine is corrected with the feedforward correction amount. A torque change amount integrated value is calculated by integrating an amount of change in the demand torque, and the feedforward correction amount is generated according to the torque change amount integrated value.

Abstract: An engine control system for preventing automatic increasing of an engine speed above a threshold engine speed when increasing engine speed toward an elevated transmission mainshaft speed during a transmission downshift includes a downshift sensor for detecting a transmission downshift in a manual transmission and an electronic control unit (ECU) operatively connected to the downshift sensor for receiving a downshift signal therefrom indicative of the transmission downshift. The ECU automatically increases the engine speed toward a transmission mainshaft speed when the downshift sensor detects a transmission downshift. The ECU limits the increasing of the engine speed to an engine target speed that is below the threshold engine speed.

Abstract: An internal combustion engine control apparatus includes a fuel supplying mechanism supplying fuel to the internal combustion engine; an exhaust gas recirculating mechanism recirculating exhaust gas of the internal combustion engine to an intake side of the internal combustion engine; a flow adjuster selectively increasing and decreasing a strength of flow of the supplied fuel and the recirculated exhaust gas in a cylinder of the internal combustion engine; a stop controller controlling the fuel supplying mechanism to stop the supply of fuel and controlling the exhaust gas recirculating mechanism to stop the recirculation of exhaust gas, when the internal combustion engine is operated in a predetermined deceleration mode; and in-cylinder flow controller controlling the flow adjuster to increase the strength of the flow when the control to stop the supply of fuel is cancelled.

Abstract: An engine control system and method for controlling engine air flow during a deceleration fuel cut includes an internal combustion engine, an anti-lock braking system (ABS), and an electronic control unit (ECU) that controls the engine. The ECU establishes a desired air flow rate for the internal combustion engine, which is taken from an ABS failed condition look-up table when determined that the ABS has failed while the engine is in a deceleration fuel cut mode, and otherwise is taken from a normal condition look-up table.

Abstract: A vehicle control system includes a sensor that generates a vehicle speed signal. A cruise control system generates a cruise control signal to maintain a vehicle at a target speed. A control module compares the vehicle speed signal to the target speed signal. The control module calculates different cruise control gains to delay changes in throttle position of the cruise control system when the vehicle speed signal is greater than the target speed.

Abstract: Systems and methods involving multiplexed engine control signals are provided. In this regard, a representative engine control system for a gas turbine engine includes: a signal relay device operative to receive multiplexed signals from an engine electronic control (EEC), demultiplex the signals, and provide demultiplexed signals to corresponding ones of multiple control devices of the engine.

Abstract: An internal combustion engine is provided with a fuel injector which injects fuel into an intake port and exhaust variable valve timing mechanism which changes a valve timing of an exhaust valve. A control device executes early exhaust valve closing control which advances a closing timing of an exhaust valve when conditions for executing early exhaust valve closing control stand. The control device includes a torque detecting means which detects an output torque output by an engine body. At the time of deceleration of the engine, even when the condition for executing early exhaust valve closing control stands, execution of early exhaust valve closing control is prohibited when it is predicted that the output torque will become smaller than the limit torque. Thus, due to execution of the early exhaust valve closing control, a large torque fluctuation is prevented from occurring at the time of deceleration of the engine.

Abstract: It is suppressed that nanoparticles generated in an internal combustion engine are discharged into the atmosphere. In a cylinder or an exhaust system of the internal combustion engine, microparticles having a particle diameter larger than that of the nanoparticles are generated, and the nanoparticles generated in the internal combustion engine are adsorbed by the microparticles, thereby increasing the diameter of the nanoparticles. The microparticles can be generated in the cylinder as the soot, for example. Additionally, by providing a carbon microparticle generation device in the exhaust system, the microparticles can be generated, too. By making the nanoparticles adsorbed by the microparticles and increasing the diameter of the nanoparticles, discharging of the nanoparticles can be suppressed.

Abstract: A universal energy-saving system for multiple working conditions includes an electronic control unit and an actuator. The electronic control unit is adapted to sample, process running, information of a vehicle and an instruction of a driver, control on and off of a fuel injector, and adapted to drive the actuator to lock or release an exhaust valve after opening the exhaust valve, so as to realize working under multiple working conditions. A, normal working condition, the performance of the original vehicle does not change; B, racing and gliding with reduced pressure, no fuel is used and there is no emission; C, working with reduced cylinders when waiting red light and cruising, non-working cylinders race with reduced pressure and no fuel. The features include: fuel of the engine is cut off when gliding, the exhaust valve is constantly half open, the engine races with reduced pressure; the inlet valve opens and closes normally, an inlet manifold is vacuum, direction and braking are not affected.

Abstract: In a vehicle in which an output of an engine is transmitted to a driving wheel through a transmission, an engine control device stops fuel injection of the engine, when engine rotational speed is above a preset specific fuel cut-off rotational speed while the vehicle is coasting; and restarts the fuel injection, when the engine rotational speed falls below a recovery rotational speed while the fuel injection is stopped, wherein the recovery rotational speed is below the specific fuel cut-off rotational speed. When determining that an operating state allows the stop and restart of fuel injection to be repeated, the engine control device sets a hunting-preventing fuel cut-off rotational speed based on an input shaft rotational speed of the transmission, wherein the hunting-preventing fuel cut-off rotational speed replaces the specific fuel cut-off rotational speed.

Abstract: An engine control system and method for controlling engine air flow during a deceleration fuel cut includes an internal combustion engine, an anti-lock braking system (ABS), and an electronic control unit (ECU) that controls the engine. The ECU establishes a desired air flow rate for the internal combustion engine, which is taken from an ABS failed condition look-up table when determined that the ABS has failed while the engine is in a deceleration fuel cut mode, and otherwise is taken from a normal condition look-up table.

Abstract: A method of regulating a throttle opening of an engine in a hybrid electric vehicle system includes initiating a fuel-cut off operating mode of the engine, monitoring an engine speed during said fuel cut-off operating mode and regulating the throttle opening based on the engine speed during the fuel-cut off mode to maintain a manifold absolute pressure (MAP) of the engine above a threshold MAP.

Abstract: It is an object to improve starting performance in an engine rotational speed region that exceeds an idle rotation region without affecting normal traveling performance. At the time when a vehicle starts moving, when in an electronic control unit 2, the rotational speed of an engine 1 is in a predetermined range that exceeds an idle rotation region and the engine rotational speed decreases, the electronic control unit 2 adds a corrected fuel injection amount corresponding to the rate of decrease to a target fuel injection amount to create a new target fuel injection amount (S202 to S208), and when the rotational speed of the engine 1 increases, the electronic control unit subtracts a corrected fuel injection amount corresponding to the rate of increase of the engine rotational speed from a target fuel injection amount to create a new target fuel injection amount (S212 to S218), whereby control of the output of the engine 1 is performed by the electronic control unit 2.

Abstract: To enable smooth, highly accurate deceleration in various usage conditions of an outboard motor and realize stabilized engine speed after deceleration, a fuel controller for controlling the amount of fuel fed to an engine of an outboard motor mounted on a boat includes a deceleration determining section arranged to determine deceleration of the boat, an engine speed detecting section arranged to detect the engine speed of the engine, an engine load detecting section arranged to detect the load on the engine, and a controller arranged to control the amount of fuel fed to the engine when the boat is in deceleration according to the detected engine speed and engine load.

Abstract: A method and apparatus, and vehicle on which the apparatus is mounted, for controlling combustion of a fuel-injection, internal-combustion engine with two or more cylinders are provided. The method includes determining a deceleration condition of a vehicle being driven by the engine, and thinning the fuel-injection of the engine when the deceleration condition is determined.

Abstract: Fuel injection is controlled to cause one of multiple cylinders to receive fuel injection and to stop in a predetermined range over an intake stroke to a compression stroke in an operation stop of the internal combustion engine. At the time of stopping the engine, fuel injection is allowed only while the observed rotation speed of the internal combustion engine is between a preset start rotation speed and a preset stop rotation speed, and at least one of the start rotation speed and the stop rotation speed are regulated based on a detected rotation stop position of a crankshaft in the operation stop of the internal combustion engine and a state of fuel injection in the cylinder stopping in the predetermined range.

Abstract: A method of feeding fuel to an engine, comprising the steps of determining whether or not the engine is decelerating based on a time-lapse change rate of an engine speed of the engine, and reducing an amount of the fuel to be fed to air taken into the engine from outside to less than a reference amount preset according to the engine speed when it is determined that the engine is decelerating.

Abstract: Fuel management system for operation of a spark ignition gasoline engine. The system includes a gasoline engine powering the vehicle and a source of gasoline for introduction into the engine. A source of an anti-knock fuel such as ethanol is provided. An injector directly injects the anti-knock fuel into a cylinder of the engine and the control system shuts down the engine by stopping gasoline and anti-knock agent flow into the engine during vehicle deceleration and idling and restarts the engine upon driver demand. Direct ethanol injection and engine shutdown results in efficiencies similar to those of full hybrid vehicles.

Abstract: There is provided a control system for controlling an internal combustion engine with an exhaust system provided with a catalyst, comprising a fuel cut means for stopping the supply of fuel to the internal combustion engine when the vehicle in which the internal combustion engine is mounted is in a decelerating state, the control system of an internal combustion engine characterized in that, in the case that the fuel cut is executed, when the speed SPD of the vehicle is higher than a predetermined first vehicle speed Sh, the intake air amount Ga of the internal combustion engine is made smaller than the intake air amount Gai of when the internal combustion engine is in the idling state (step 120), while when the speed SPD is the first vehicle speed Sh or less, the intake air amount Ga is made larger than the intake air amount Gai of when the internal combustion engine is in the idling state (step 130).

Abstract: To enable smooth, highly accurate deceleration in various usage conditions of an outboard motor and realize stabilized engine speed after deceleration, a fuel controller for controlling the amount of fuel fed to an engine of an outboard motor mounted on a boat includes a deceleration determining section arranged to determine deceleration of the boat, an engine speed detecting section arranged to detect the engine speed of the engine, an engine load detecting section arranged to detect the load on the engine, and a controller arranged to control the amount of fuel fed to the engine when the boat is in deceleration according to the detected engine speed and engine load.

Abstract: The problem during overrun fuel cut-off operations, i.e. cut-off of fuel injection during trailing throttle conditions of the vehicle, is that the transition entails an undue torque jump, resulting in the smooth operation of the engine and the driving comfort of the passengers of the vehicle being affected. The aim of the invention is to reduce the torque jump. Said aim is achieved by injecting fuel into a cylinder of the Otto engine in a multiple injection process, at least a partial quantity of the fuel that is to be injected being injected during the compression phase, whereby the quantity of air that is taken in advantageously decreases because no internal cooling takes place while the efficiency is advantageously reduced due to the lesser degree of swirling, resulting in lower torque. Overall, torque (DM) is reduced to a significantly greater extent than by merely adjusting the spark angle (ZW) while smooth operation of the Otto engine is not affected.

Abstract: A method for operating a drive unit, in which, given the use of a vehicle-speed controller, the actual speed is prevented from exceeding the setpoint speed too significantly. In the method, a setpoint value for an output variable of the drive unit is predetermined. An overrun fuel cutoff of the drive unit is enabled as soon as the setpoint value for the output variable falls below a characteristic value for the overrun fuel cutoff.

Abstract: Fuel injection is controlled to cause one of multiple cylinders to receive fuel injection and to stop in a predetermined range over an intake stroke to a compression stroke in an operation stop of the internal combustion engine. At the time of stopping the engine, fuel injection is allowed only while the observed rotation speed of the internal combustion engine is between a preset start rotation speed and a preset stop rotation speed, and at least one of the start rotation speed and the stop rotation speed are regulated based on a detected rotation stop position of a crankshaft in the operation stop of the internal combustion engine and a state of fuel injection in the cylinder stopping in the predetermined range.

Abstract: Engine cylinder reactivation from a fuel-cut state is controlled based on a calculated future engine speed and a minimum allowable engine speed. The future engine speed is calculated based on the current rate of change of engine speed and a duration required to reactivate an engine cylinder. The duration can be in the time domain, or engine event domain, for example.

Abstract: In order to prevent the generation of surge noise or other abnormal phenomena during deceleration of a vehicle, the present engine control apparatus comprises a turbo-supercharger driven by exhaust energy of the engine, at least one of an NOx trap catalyzer and a DPF mounted in the exhaust path of the engine for purifying the exhaust, an EGR path interconnecting the exhaust path and the inlet path of the engine, an EGR valve for adjusting the cross-section of the duct of the EGR path, means for detecting deceleration, and a fuel cutoff control means that, if predetermined conditions are satisfied, effects fuel cutoff control to reduces the rate of fuel injection, wherein the EGR valve is closed during the period of vehicle deceleration.

Abstract: The invention comprises a method to determine a position of a piston in a cylinder of an engine during ongoing operation, comprising adapting pressure sensing devices to monitor in-cylinder pressure, and, operating the engine. In-cylinder pressure is monitored along with a corresponding engine crank position. The engine is operated in a motoring mode and in a cylinder firing mode, and a plurality of instantaneous in-cylinder pressure states are determined during compression and expansion strokes. Pressure ratios are determined based upon the instantaneous in-cylinder pressure states, which are used to determine an engine crank angle and compression ratio error and, adjust the monitored engine crank position based upon the crank angle error and readjust engine operation according to these sensed errors.

Abstract: A method is provided for operating an internal combustion engine 10 in overrun condition, which method includes the steps of: release of a monitoring of a control signal for a power actuator of the internal combustion engine when predetermined release conditions have been satisfied, which include the exceeding of a release rotary speed of the internal combustion engine; after the release, comparing a control signal for the power actuator of the internal combustion engine to a threshold value, and triggering an error response if the control signal exceeds the threshold value. The method provides that the release speed is varied as a function of the intervention of an idling speed control in the formation of the control signal. Also provided is a control unit which controls such a method.

Abstract: A fuel injection valve control to correctingly increase the fuel amount appropriately for realizing a favorable acceleration performance at the time of accelerating after a throttle full closure period is finished.

Abstract: An electronic control unit compulsorily stops supply of a fuel injection quantity, which is calculated based on various parameters including a throttle opening degree, performed by an injector in accordance with a crank angle signal if a series of operations, of rapidly opening a throttle valve from a certain throttle opening degree and then rapidly closing the throttle valve, occurs within a predetermined time in one combustion cycle of an internal combustion engine after completion of stroke determination. The electronic control unit removes the compulsory stoppage of the supply of the fuel injection quantity if drawing of an air intake quantity overlaps with at least one-third of an intake stroke in one combustion cycle of the engine.