Abstract: An aircraft engine includes an aircraft engine controller configured to detect an actual peak exhaust gas temperature of a cylinder assembly. The aircraft engine controller detects an intersection between a first function representing a relationship between a set of rich exhaust gas temperature signals and a corresponding set of rich fuel-air ratio values and a second function representing a relationship between a set of lean exhaust gas temperature signals and a set of lean fuel-air ratio values. Based upon the intersection between the first and second functions, the engine controller detects an actual peak fuel-air ratio value for the cylinder assembly and can determine if a correction in the fuel-air ratio of a fuel-air mixture provided to the cylinder assembly is required. Accordingly, the engine controller provides each cylinder assembly of the aircraft engine with an accurate fuel-air mixture to allow for operation of the engine with optimal fuel economy.

Abstract: The invention relates to n internal combustion engine and method for controlling a supercharged internal combustion engine, wherein a deviation of the actual lambda value from a calculated lambda value is detected. The value for the exhaust back pressure is corrected subject to the detected deviation for the event of a valve overlap, when the gas exchange valves of the burner head are simultaneously open. The corrected value for the exhaust back pressure is used to determine the air volume in the cylinder.

Abstract: The present disclosure provides a control strategy for balancing injector-to-injector fueling variations for a combustion engine having multiple combustion chambers (and cylinders), with multiple individually actuated injectors for injecting fuel into the combustion chambers, wherein at least one injector is assigned to each combustion chamber and a common rail supplies fuel to the multiple injectors. The method includes changing the actuation waveform of an injector assigned to a combustion chamber having an exhaust gas temperature deviating by more than the predetermined value from the average exhaust gas temperature, in order to change the amount of fuel injected.

Abstract: A method comprises operating an engine of a vehicle to provide output torque to an input of a torque converter, determining whether the engine is in a cold start condition, fixing an input shaft of a transmission when the engine is in the cold start condition, and coupling the input shaft of the transmission to an output of the torque converter. A control module comprises a combustion control module that operates an engine of a vehicle to provide output torque to an input of a torque converter, a NPD module that determines whether the engine is in a cold start condition, and a transmission control module that fixes an input shaft of a transmission when the engine is in the cold start condition, wherein the input shaft of the transmission is in communication with an output of the torque converter.

Abstract: An oxygen sensor is mounted in an exhaust path of an internal combustion engine. The status of an exhaust gas is detected in accordance with the output of the oxygen sensor. The oxygen sensor incorporates a heater for heating an element of the sensor. In a region in which the temperature of the sensor element is below 300° C., an adsorbable species becomes adsorbed. In a region in which the exhaust pipe temperature is above 80° C., the adsorbable species becomes adsorbed remarkably. Power supply control is continuously exercised over the heater so as to maintain the sensor element at a temperature of 300° C. or higher until the exhaust pipe temperature drops below 80° C. after an internal combustion engine stop. The power supply to the heater is shut off after the exhaust pipe temperature drops below 80° C.

Abstract: A method comprises determining a temperature of a particulate matter (PM) filter in communication with an exhaust gas from an engine; and reducing a power output of the engine when the PM filter is not being regenerated and the temperature exceeds a first predetermined temperature. A control module comprises a PM filter temperature determination module that determines the temperature of a PM filter in communication with an exhaust gas from an engine; and a reduced engine power module in communication with the PM filter temperature determination module that reduces the power output of the engine when the PM filter is not being regenerated and the temperature exceeds a first predetermined temperature.

Abstract: A method for accurate estimation of a gas temperature at transient conditions includes measuring temperature sensor readings in a gas flow and estimating the gas temperature by equating the specific heat properties of the temperature sensor to the sum of conductive heat, convective heat, and radiative heat acting upon the temperature sensor and solving for the gas temperature.

Abstract: A diesel engine may be stably controlled without an exhaust gas temperature at an upstream side of a turbocharger, by a method for controlling a diesel engine that includes: detecting an engine rotation speed; detecting or estimating a lambda value; estimating an exhaust gas temperature at an upstream side of a turbocharger by using relationship between the lambda value and an exhaust temperature; determining whether the estimated exhaust gas temperature exceeds a first predetermined reference value; and limiting an engine output power and/or regeneration of a CPF when the estimated exhaust gas temperature exceeds the first predetermined reference value.

Abstract: An engine air supply control method relating to a turbocharged engine including an intake manifold (20) which is disposed downstream of the compressor of the turbocharger (14) and an exhaust manifold (22) which is disposed upstream of the turbine of the turbocharger (14). The method includes determining the mass air flow supplying the engine and/or the pressure in the intake manifold (20) and the temperature in the exhaust manifold. The pressure in the exhaust manifold (22) is determined as a function of the pressure in the intake manifold (20), the engine speed, the temperatures in the cylinders (4) and in the exhaust manifold (22), the pressure in the intake manifold (20) being optionally determined from the mass air flow. Inversely, the pressure in the intake manifold.

Abstract: A device for controlling an operating state of a catalytic converter of an exhaust line pertaining to an internal combustion engine. The device determines the temperature upstream of the catalytic converter, adds fuel to the exhaust line of the engine at the moment at which the temperature of the exhaust gas upstream of the catalytic converter corresponds to the ignition temperature of a catalytic converter with a normal operation, and controls the quantity of heat emitted by the reaction generated in the catalytic converter as a result of the addition of fuel. The addition device includes a dedicated fuel supply system arranged in the exhaust line of the engine upstream of the catalytic converter to be controlled.

Abstract: A method for regulating an actual output variable of an internal combustion engine to a reference variable. A maximum value for the reference variable is generated as a function of at least one physical variable in the exhaust system of the internal combustion engine and the reference variable is limited to this maximum value.

Abstract: A hybrid vehicle propulsion system, comprising of an engine having at least one combustion cylinder configured to selectively operate in one of a plurality of combustion modes, wherein a first combustion mode is a spark ignition mode and a second combustion mode is a homogeneous charge compression ignition mode, an energy storage device configured to store energy, a motor configured to absorb at least a portion of an output produced by the engine and convert said absorbed engine output to energy storable by the energy storage device and wherein the motor is further configured to produce a motor output, a fuel tank vapor purging system coupled to the engine, and a controller configured to vary fuel vapors supplied to the engine during different combustion modes of the engine.

Abstract: A barometric pressure regulator circuit is described. The circuit includes a memory storing output parameters to be supplied to a pressure regulator unit, and a processor operatively coupled to the memory. The processor is configured to perform operations including receiving voltage signals representing output parameters of an engine, storing the received voltage signals in the memory, identifying output parameters to be supplied to the pressure regulator unit that correspond to the received voltage signals, converting the identified output parameters into output electrical signals, and transmitting the output electrical signals to the pressure regulator unit.

Abstract: A system is provided for removing particulate matter from a diesel particulate filter. The system includes an engine controller coupled to the diesel engine, and to a locomotive controller. The locomotive controller includes an algorithm to create a trip plan to optimize the performance of the locomotive along a route in accordance with a power setting of the diesel engine at each location along the route. Each sensor is configured to output a first alert signal to the engine controller once the trapped particulate matter exceeds a predetermined threshold. Upon receiving the first alert signal, the engine controller communicates with the locomotive controller to determine a time region or distance region within the trip plan when the power setting exceeds a power threshold. The engine controller increases the temperature of the diesel exhaust gas entering the diesel particulate filter during the time region or distance region.

Abstract: An internal combustion engine has at least one cylinder and an exhaust gas tract, in which an exhaust gas sensor, that can be heated in a controlled manner, is arranged. An exhaust gas temperature of an exhaust gas flowing in the exhaust gas tract is determined as a function of the heating power (P_HEAT) supplied to the exhaust gas sensor. An estimated value of the exhaust gas temperature is determined as a function of a physical model of the combustion of the air/fuel mixture and of the exhaust gas tract as a function of at least one operating variable of the internal combustion engine, but independent of the heating power supplied to the exhaust gas sensor. Model parameters of the physical model are adapted as a function of a deviation of the estimated value and of the exhaust gas temperature determined by the supplied heating power.

Abstract: A system and method for controlling an engine involves providing a model for volumetric efficiency. The model recognizes that volumetric efficiency (VE) has stronger dependency on intake pressure than on exhaust pressure. The model allows tuning of the relative importance of intake pressure to exhaust pressure, specifically, by reducing the relative importance of the exhaust pressure to intake pressure in the composite volumetric efficiency load variable. The model provides for a calculation where the exhaust pressure term of the engine pressure ratio is de-rated through the use of an exponent less than one.

Abstract: A control system for an internal combustion engine, which is capable of properly performing air-fuel ratio control and ignition timing control according to an actual amount of intake air, even when reliability of the results of detection of the operating condition of a variable intake mechanism is low. The control system for controlling air-fuel ratio and ignition timing includes an ECU. The ECU calculates a target air-fuel ratio, calculates an air-fuel ratio correction coefficient, calculates a statistically processed value of an air-fuel ratio index value, calculates a corrected valve lift and a corrected cam phase, and determines a fuel injection amount according to the corrected valve lift, the corrected cam phase, and the air-fuel ratio correction coefficient.

Abstract: An engine protection system for a construction machine can individually diagnose the exhaust temperature specific to each cylinder of an engine corresponding to an engine revolution speed in order to find an abnormal condition of each engine cylinder in advance. A revolution speed sensor 14 detects revolution speed of an engine mounted in the construction machine and, a plurality, e.g., 16, cylinder temperature sensors 20a-20p detect exhaust temperatures of respective cylinders of the engine. A data recording unit 26 and a display controller 24 store the detected engine revolution speed and the detected exhaust temperatures of the respective cylinders. Trend data, which is produced based on the stored data, is sent to an office via a portable terminal and the display controller 24 outputs, a signal for playing back and displaying snapshots based on the stored data to a display unit 23 disposed in the cab 5.

Abstract: A method for controlling exhaust gas temperature of a combustion engine comprising: setting predefined high and low exhaust temperatures; using at least one sensor to measure exhaust gas temperature; using computer instructions to instruct a processor to compare the measured temperature to the predefined high and low exhaust temperatures, determine a change between a first measured temperature and a second measured temperature over a small defined time interval, multiply the change by a factor that coincides with an internal lag time of the at least one sensor to provide a forecasted exhaust gas temperature, and control voltage to at least one accessory of the combustion engine to reduce the exhaust gas temperature when the forecasted exhaust gas temperature reaches or exceeds the predefined high exhaust temperature, or to increase the exhaust gas temperature when the forecasted exhaust gas temperature reaches the predefined low exhaust temperature.

Abstract: An exhaust control system for an internal combustion engine having a plurality of actuators wherein each actuator controls a predetermined engine parameter. A plurality of sensors are also associated with the engine and each sensor provides an output representative of an engine operating condition. The control system includes a PID controller associated with each actuator and in which each PID controller has an input, an output and a feedback between the input and the output. A distribution function circuit is operatively connected in series with the inputs of the PID controller. The distribution function circuit receives an error signal representative of the difference between a target value and an actual value of one or more engine operating conditions, previously determined control factor values and the feedback from each PID controller as input signals. The distribution function circuit varies the input to each PID controller as a function of the distribution function input signals.

Abstract: The invention relates to n internal combustion engine and method for controlling a supercharged internal combustion engine, wherein a deviation of the actual lambda value from a calculated lambda value is detected. The value for the exhaust back pressure is corrected subject to the detected deviation for the event of a valve overlap, when the gas exchange valves of the burner head are simultaneously open. The corrected value for the exhaust back pressure is used to determine the air volume in the cylinder.

Abstract: A fuel supply system of the present invention is characterized by including: a fuel reformer (4) for producing a reformed gas-containing fuel by causing discharge in a raw liquid fuel; and a fuel supply device (8) for supplying the reformed gas-containing fuel or a mixture of the reformed gas-containing fuel and the raw fuel into a combustion chamber of an engine (5).

Abstract: An apparatus for monitoring the condition of a particulate filter situated within the exhaust flow path of a combustion engine, the apparatus comprising: means defining an exhaust gas recirculation (EGR) passage; means located within said exhaust gas recirculation (EGR) passage for sensing pressure and generating a signal indicative thereof; and computing means arranged to derive a pressure reduction value corresponding to the signal generated by said pressure-sensing means. The computing means will then determine whether said pressure reduction value exceeds a predetermined value and provide an indication of an unacceptable condition of the particulate filter.

Abstract: An internal-combustion engine, comprises at least one cylinder, at least one intake pipe and at least one exhaust pipe associated to the cylinder, at least one intake valve and at least one exhaust valve, which control passage through the intake and exhaust pipes, wherein there are provided first sensor device(s) for detecting the temperature in the intake pipe, second sensor device(s) for detecting the pressure in the intake pipe, third sensor device(s) for detecting the engine r.p.m., and fourth device(s) for detecting or calculating the temperature in the exhaust pipe. An electronic control unit pre-arranged for receiving the signals at output from the first second and third sensor device(s) calculates the amount of fresh air taken in by the engine on the basis of a mathematical model that is of general applicability and that, in particular, is applicable irrespective of the technological implementation specifically used for a system for variable valve actuation with which the engine can be provided.

Abstract: An exhaust recirculation system is provided for reducing NOx emitted from the power source at low-idle speeds. The power source has at least one combustion chamber, an intake manifold, a first exhaust manifold, and a second exhaust manifold. The exhaust recirculation system has a valve located in at least one of the first or second exhaust manifolds. The valve is moveable to increase the temperature of an exhaust gas by directing exhaust gas from the at least one of the first and second exhaust manifolds to the intake manifold. Furthermore, the exhaust recirculation system has a controller configured to determine at least one power source condition indicative of an exhaust temperature and move the valve in response to the determination.

Abstract: In a method and apparatus for the cylinder-specific determination and control of a fuel injection quantity for a multi-cylinder internal combustion engine, the exhaust gas pressures of the cylinders of the internal combustion engine is recorded on a time-resolved, i.e. crankshaft angle-resolved, basis, and an exhaust gas pressure is calculated therefrom individually for each cylinder and used to determine the fuel quantity injected into the corresponding cylinder. In a comparison with a desired value the cylinder-specific actual fuel injection quantity error is then determined and used to set a corrected quantity of fuel to be injected into the corresponding cylinder.

Abstract: The temperature of an exhaust gas flowing through an exhaust passage 3 is estimated or detected, and the temperature of an active element of an exhaust gas sensor 8. (O2 sensor) is controlled at a predetermined target temperature by a heater using the estimated or detected temperature of the exhaust gas. For estimating the temperature of the exhaust gas in the vicinity of the exhaust gas sensor 8, the exhaust passage 3 extending up to the exhaust gas sensor 8 is divided into a plurality of partial exhaust passageways 3a through 3d, the temperatures of the exhaust gas in the partial exhaust passageways 3a through 3d are estimated successively from an exhaust port 2 of an engine 1. The temperature of the exhaust gas is estimated according to an algorithm which takes into account a heat transfer between the exhaust gas and passage-defining members 6a, 6b, 7 which define the exhaust passage 3 and a heat radiation from the passage-defining members into the atmosphere.

Abstract: Provided is a control device for an internal combustion engine that can execute a sulfur purge in a favorable manner under all conditions without complicating the control action or the engine structure. The process comprises detecting a temperature of the NOx catalytic converter, detecting an exhaust air fuel ratio in the catalytic converter, computing a target exhaust air fuel ratio according to a detected temperature of the NOx catalytic converter, and controlling a fuel injection valve so as to make an actual exhaust fuel ratio agree with the target exhaust air fuel ratio. If the temperature of the NOx catalytic converter is not high enough to enable a sulfur purge, a temperature increase control is executed to increase the temperature of the NOx catalytic converter by suitably changing various engine parameters.

Abstract: In order to improve the performance of a common rail engine and reduce the number of false alarms by the exhaust gas temperature monitoring system, the present disclosure provides a control strategy for balancing injector-to-injector fueling variations for a combustion engine having multiple combustion chambers (and cylinders), with multiple individually actuated injectors for injecting fuel into the combustion chambers, wherein at least one injector is assigned to each combustion chamber and a common rail supplies fuel to the multiple injectors.

Abstract: In an engine fuel supply method, a first fuel pressure difference between a fuel injection amount computation timing and a first fuel injection timing and a second fuel pressure difference between the fuel injection amount computation timing and a second fuel injection timing are estimated at the fuel injection amount computation timing based on a control state of a fuel pneumatic transportation amount of a high-pressure fuel pump. The first fuel injection amount is corrected based on the first fuel pressure difference and the second fuel injection amount is corrected based on the second fuel pressure difference. A fuel injection valve is selectively controlled to supply the high-pressure fuel directly into a cylinder of the engine at the first fuel injection timing with the corrected first fuel injection amount and at the second fuel injection timing with the corrected second fuel injection amount.

Abstract: A method and a device for operating an internal combustion engine make it possible to monitor a temperature sensor or a lambda sensor in an exhaust system of the internal combustion engine for functionality in the entire operating range of the internal combustion engine. To that end, the plausibility of the signal of the temperature sensor is checked with a signal of the lambda sensor for a predetermined relationship.

Abstract: A control system for estimating the performance of a compressor is disclosed. The control system has a compressor fluidly connected to an inlet manifold of a power source. The control system also has a power source speed sensor to provide an indication of a rotational speed of the power source, an inlet pressure sensor to provide an indication of a pressure of a fluid within the inlet manifold, an inlet temperature sensor to provide an indication of a temperature of the fluid within the inlet manifold, an atmospheric pressure sensor to provide an indication of an atmospheric pressure, and a control module in communication with each of the sensors. The control module is configured to monitor an engine valve opening duration and an exhaust gas recirculation valve position, and estimate a compressor inlet pressure based on the provided indications, the monitored duration, and the monitored position.

Abstract: The controller includes combustion mode switching means for decreasing an exhaust gas temperature in the spark ignition combustion immediately before the combustion mode switching based on an estimated exhaust gas temperature immediately before the combustion mode switching, or for decreasing an EGR amount in the HCCI combustion immediately after the combustion mode switching.

Abstract: In an internal-combustion engine, comprising at least one cylinder, at least one intake pipe and at least one exhaust pipe associated to the cylinder, at least one intake valve and at least one exhaust valve, which control passage through said intake and exhaust pipes, there are provided first sensor means for detecting the temperature in said intake pipe, second sensor means for detecting the pressure in said intake pipe, third sensor means for detecting the engine r.p.m., and fourth means for detecting or calculating the temperature in said exhaust pipe. An electronic control unit pre-arranged for receiving the signals at output from said first, second and third sensor means calculates the amount of fresh air taken in by the engine on the basis of a mathematical model that is of general applicability and that, in particular, is applicable irrespective of the technological implementation specifically used for a system for variable valve actuation with which the engine can be provided.

Abstract: A control apparatus retards ignition timing of the engine, and increases an amount of a fuel supplied to the engine based on a retard amount of the ignition timing, by calculating a maximum engine intake air amount at which an exhaust system temperature can be maintained at or below a predetermined upper limit temperature by increasing the amount of the fuel supplied to the engine without causing a misfire of the engine, and limiting an engine intake air amount to a value no greater than the maximum engine intake air amount.

Abstract: A method for controlling and regulating an electrical heating of a probe situated in the exhaust system of an internal combustion engine, a total heating power of the probe being set, and an actual temperature value of the probe being determined by measuring a characteristic parameter, e.g., a resistance. To prevent overheating of the probe ceramics, and therefore over-compensation of aging effects when using such a method, a rated heating power is determined by way of a program map as a function of operating points of the internal combustion engine; a control heating power is determined from the actual temperature value and a new setpoint value in a controller; and the total heating power is formed as the sum of the rated heating power and the control heating power. Moreover, due to this procedure, the regulating reserve of the controller is retained in wide ranges of the operating points. A cost advantage is yielded, because a measuring resistor and an analog-to-digital converter can be omitted.

Abstract: A method for operating a marine engine uses four valves to control the flow of secondary air that is inducted into each of the cylinders of an engine. An oxygen sensor is disposed in an exhaust passage downstream from the cylinders and upstream from a catalytic converter. A carburetor is calibrated to provide a richer than stoichiometric air/fuel ratio so that inducted secondary air through the valves associated with each cylinder can result in a stoichiometric ratio of air flowing into each cylinder. The cylinders are each provided with their own valve in order to allow the air/fuel ratios to be equalized for each cylinder regardless of the configuration and geometry of the intake manifold and its associated conduits.

Abstract: An air fuel ratio control system includes an exhaust gas sensor to sense an oxygen concentration in an exhaust passage of an internal combustion engine, and a controller. The controller is configured to judge that the exhaust gas sensor is in an active state, by monitoring a decrease of an output of the exhaust gas sensor from a level greater than a first predetermined value, to a level smaller than or equal to the predetermined first predetermined value, and to allow the air fuel ratio control when the exhaust gas sensor is judged to be in the active state.

Abstract: An internal combustion engine including a carburetor. The internal combustion engine includes a choke valve disposed within the carburetor, and a choke lever interconnected with the choke valve for movement with the choke valve. The engine also includes a throttle valve disposed within the carburetor and a throttle lever interconnected with the throttle valve for movement therewith. An intermediate lever is disposed between the throttle lever and the choke lever for movement with the choke and throttle levers. In one embodiment, the engine includes a connecting link coupled between the choke and intermediate levers, the connecting link movable with movement of the choke lever such that movement of the choke lever is translated into movement of the intermediate lever.

Abstract: The present invention has been realized in order to keep the cylinder exhaust temperature of a gas engine within a predetermined range, and thereby prevent the generation of misfire and knocking. In the present invention, in S1, when the number of rotations of the engine is greater than a predetermined number, in S2, the exhaust temperatures of the cylinders are sampled at predetermined intervals, in S3, an average of the exhaust temperatures is calculated, in S4, the load factor at that point is determined, in S5, the average exhaust temperature Tave is compared with the exhaust temperature T(n) of each cylinder, and it is determined whether the deviation ?Tn is greater or smaller than the set deviation Tlimit for that load factor. When the deviation ?Tn is smaller, the exhaust temperature is within the set deviation and there is no need to adjust the fuel spray period, and therefore the sequence returns to S2.

Abstract: A method for operating a variable compression ratio internal combustion engine includes the steps of determining a compression ratio operating state of the engine and inferring an exhaust temperature for the engine based at least in part on the compression ratio operating state of the engine.

Abstract: A computer implemented lean assist function monitors exhaust gas temperature in a plurality of cylinders in an engine along with fuel flow. The lean assist function automatically detects whether the pilot is leaning for best power or best economy and provides an indication to the pilot when the desired fuel mixture has been achieved based on the monitored temperatures.

Abstract: An automatic choke apparatus for use in an internal combustion engine. The choke apparatus includes a choke valve automatically operable in response to the speed of the engine, a thermally conductive assembly that conducts heat from exhaust gases produced by the engine, a thermally responsive member in thermal communication with the thermally conductive assembly, and a mechanism that moves in response to the thermally responsive member to cause the choke valve to remain in at least a partially open position during engine starting when the thermally responsive member senses a temperature above a predetermined temperature. The thermally conductive assembly at least partially surrounds the path of the exhaust gases.

Abstract: A method for determining the instantaneous temperature of a medium, the medium surrounding an element able to be electrically heated at least intermittently to a constant, known temperature. It is provided for the instantaneous temperature of the medium to be determined from a heating power supplied to the element.

Abstract: In one embodiment of the present invention, a system is disclosed for monitoring the backpressure produced by a particulate filter of an internal combustion engine. When the backpressure of the engine exceeds a predetermined threshold, indicating that the particulate filter should be serviced soon, an input to the electronic control module (ECM) indicating the intake manifold boost pressure is shunted to ground, thereby giving the ECM a false indication that no boost is being applied to the intake manifold. This will cause the ECM, according to its normal engine management software, to derate the engine performance to a “no air torque setting”, thereby limiting the amount of torque that the vehicle operator can extract from the engine. This decreased performance of the engine provides a very high incentive to the vehicle operator to bring the vehicle in for servicing, at which point the particulate filter can be serviced.

Abstract: An engine control system for maintaining the operator-commanded speed setting of an internal combustion engine over a range of engine loads and for easy starting and improved efficiency over a range of ambient and engine operating temperatures. The engine control system includes a governor assembly driven by the engine, the governor assembly supplying an output to a sensor assembly through a mechanical coupling member operator. The sensor assembly provides an engine speed control signal which corresponds to operator commanded engine speed and actual engine speed. The engine speed control signal is provided to a throttle actuator to control actual engine speed is controlled to correspond with the operator-commanded engine speed regardless of loads imposed on the engine.

Abstract: The invention relates to a virtual sensor of exhaust emissions from a fuel-injection endothermic engine having a combustion chamber in each of its cylinders, a fuel injector serving each combustion chamber, and an electronic fuel-injection control unit. Advantageously, the virtual sensor includes an input interface receiving a signal from at least one pressure sensor for measuring the pressure inside at least one combustion chamber of the engine, a second input interface receiving signals from the electronic fuel-injection control unit, and a calculation block to provide estimates of the amounts of nitrogen compounds and particulates in the emissions based on the pressure and other relevant signals to the engine operation.

Abstract: Increase in quantity of particulates during a prescribed time period is acquired as first difference data (DX) that is based on pressure differential ?P across a filter (32) and derived from first estimation data (D2) obtained from a first estimation calculator (52) and is simultaneously acquired as second difference data (DY) that is based on integration of the quantity of particulate generation per unit time and derived from second estimation data (D3) obtained from a second estimation calculator (53), and the second estimation data (D3) is corrected using correction data (D4) calculated from the first and second difference data (DX, DY) to acquire corrected second estimation data (D6). A discriminator (73) determines which of the first estimation data (D2) and corrected second estimation data (D6) is suitable data and the regeneration control of the filter is conducted using the so-selected estimation data (Q).

Abstract: A fuel injection control device includes an after treatment device for purifying exhaust gas by the action of a catalyst, an exhaust gas temperature detector for detecting the exhaust gas temperature, and a controller for controlling the fuel injection quantity and fuel injection timing. The controller executes an exhaust gas temperature increase control by post-injection when the exhaust gas temperature detected by exhaust gas temperature detection means is less than the activity temperature of the catalyst in the after treatment device.

Abstract: A hydraulically actuated electronically controlled unit injection system comprises a pressure intensifier associated with a hydraulically controlled differential valve (HDV) having a poppet valve opening into a working chamber of the pressure intensifier wherein there is a throttling slot between the poppet valve chamber and the working chamber with either at least a bypass channel between the poppet valve chamber and the working chamber or a bore connecting the working chamber to a control chamber of the HDV.