A method for calibrating an electronic fuel injector with a control module and the electronic fuel injector disposed on a test apparatus may include: setting a supply voltage to a control module; applying a control voltage signal having a pulse width to an electronic fuel injector by the control module; determining whether a fuel pressure of a fuel supply to the electronic fuel injector decreases by a predetermined amount; and in response to determining that the fuel pressure of the fuel supply to the electronic fuel injector decreases by the predetermined amount, recording the pulse width and the supply voltage to the control module.

A control device for an internal combustion engine is provided. The control device includes an electronic control unit. The electronic control unit is configured to set a target air-fuel ratio to a rich air-fuel ratio from a time at which fuel cut control for terminating fuel supply to a combustion chamber during operation of the internal combustion engine is terminated to a time at which an output air-fuel ratio of a downstream-side air-fuel ratio sensor becomes a rich determination air-fuel ratio or lower, temporarily set the target air-fuel ratio to the rich air-fuel ratio after the output air-fuel ratio of the downstream-side air-fuel ratio sensor becomes the rich determination air-fuel ratio or lower, and thereafter set the target air-fuel ratio to a lean air-fuel ratio.

A control apparatus for an engine introduces purge gas containing fuel gas evaporated from a fuel tank into an intake system includes an air-fuel ratio calculation unit that calculates an air-fuel ratio (AF) of the engine, and a purge rate calculation unit that calculates a purge rate (R.sub.PRG) corresponding to an introduction rate of the purge gas. The control apparatus further includes a concentration calculation unit that calculates a concentration (K.sub.AF.sub._.sub.PRG) of the purge gas based on the air-fuel ratio (AF) calculated by the air-fuel ratio calculation unit and the purge rate (R.sub.PRG) calculated by the purge rate calculation unit. A decision unit permits or inhibits the concentration calculation unit to calculate the concentration (K.sub.AF.sub._.sub.PRG) based on the purge rate (R.sub.PRG) calculated by the purge rate calculation unit. The estimation accuracy of the concentration (K.sub.AF.sub._.sub.PRG) of purge gas is improved.

A method of controlling a concentration of hydrocarbons in exhaust gas from an internal combustion engine includes sensing an oxygen percentage of the flow of exhaust gas from the internal combustion engine and determining a concentration of hydrocarbons in the flow of exhaust gas. An engine control module may then adjust the sensed oxygen percentage of the exhaust gas based on the determined concentration of hydrocarbons in the flow of exhaust gas to define a corrected oxygen percentage. The control module may then control at least one of a hydrocarbon injection rate for in-cylinder combustion of the internal combustion engine, and a hydrocarbon injection rate for a post combustion exhaust gas treatment process, based on the corrected oxygen percentage, to control the concentration of hydrocarbons in the exhaust gas.

A method involves controlling a fuel injector to inject a first quantity of a fuel into a cylinder from a plurality of cylinders, of an engine and detecting a first value of a parameter associated with the engine. The method further involves controlling the fuel injector to inject a second quantity of the fuel different from the first quantity of the fuel, into the cylinder of the engine and detecting a second value of the parameter associated with the engine. The method also involves comparing the first value with the second value and detecting a hardware anomaly associated with the engine based on the comparison of the first value with the second value.

A control system for an engine of a vehicle includes an adder module that determines a temperature sum based on a sum of a plurality of temperatures determined based on (i) a plurality of operating parameters of the vehicle and (ii) a plurality of predetermined values calibrated for determining an estimated temperature at a location within an exhaust system of the vehicle. A temperature difference module determines a temperature difference based on the temperature sum and a previous value of the temperature difference. An estimating module determines the estimated temperature at the location within the exhaust system based on the temperature difference and a reference temperature. An actuator control module selectively adjusts at least one engine actuator based on the estimated temperature.

A control system for an engine of a vehicle includes an adder module that determines a pressure sum based on a sum of a plurality of pressures determined based on (i) a plurality of operating parameters of the vehicle and (ii) a plurality of predetermined values calibrated for determining an estimated pressure at a location within an exhaust system of the vehicle. An estimating module determines the estimated pressure at the location within the exhaust system based on the pressure sum and a reference pressure. An actuator control module selectively adjusts at least one engine actuator based on the estimated pressure.

The present disclosure generally relates to internal combustion engines. The teachings thereof may be embodied in methods for the measuring of a feedback signal generated by the movement dynamics of a fuel injector in operation. A method may include: (a) generating an electrical test pulse; (b) feeding the test pulse into an actuation line connecting the output stage to the injector to an electric drive of the injector; (c) measuring an electrical response pulse generated by the actuation line in response to the test pulse; (d) identifying a characteristic feature of the measured response pulse; (e) transferring the feature to a control and evaluation unit; (f) evaluating the feature; and (g) acquiring the characteristic information item about the measuring channel based on the evaluation of the transferred characteristic feature.

A control apparatus of an engine including intake and exhaust valves and a variable valve timing mechanism for varying open and close timings is provided. The apparatus includes a processor configured to execute an increasing amount controlling module for performing a fuel amount increase control in which a fuel injection amount is increased to decrease an exhaust gas temperature, and a valve controlling module for controlling, via the variable valve timing mechanism, an overlapping period in which the intake and exhaust valves are both opened on intake stroke. When the increasing amount controlling module performs the increase control, based on an increase of a temperature of the exhaust gas in the increase control, the valve controlling module determines whether a protection for an exhaust system component is required, and if the protection is determined to be required, the valve controlling module shortens the overlapping period.

A control device for controlling an engine based on an operating state of a vehicle is provided. The control device includes a processor configured to execute a basic target torque determining module for determining a basic target torque based on an operating state of the vehicle, a torque reduction amount determining module for determining a torque reduction amount based on a part of the operating state of the vehicle, a final target torque determining module for determining a final target torque based on the basic target torque and the torque reduction amount, an engine controlling module for controlling the engine to output the final target torque, and a torque change smoothing module for smoothing a chronological change of the final target torque corresponding to the torque reduction amount at a smaller smoothing degree than that of the chronological change of the final target torque corresponding to the basic target torque.