Abstract: An internal combustion engine is selectively operative in one of a plurality of combustion modes. A method for controlling the engine includes commanding the engine operation to transition from a first combustion mode to a second combustion mode. Engine valve operation is commanded to a desired valve overlap and valve overlap is monitored. Engine operation is changed to the second combustion mode when the engine valve overlap achieves a predetermined range or threshold.

Abstract: A method is disclosed including operations to interpret an engine load level for a reciprocating piston internal combustion engine. In response to determining the engine load level is less than 40% of a maximum engine load level, the method further includes operations to performing a first fuel injection event including less than 25% of a combustion fuel amount, the first fuel injection event occurring before 10 degrees after top dead center (TDC), to perform a second fuel injection event including between 15% and 65% of the combustion fuel amount, the second fuel injection event occurring after 10 degrees after TDC, and to perform third fuel injection event comprising between 10% and 85% of the combustion fuel amount, the third fuel injection event occurring before 63 degrees after TDC.

Abstract: Methods are provided for operating an engine with a variable fuel blend in a cylinder, where the variable fuel blend varies a peak achievable engine torque for a given operating condition. One example method comprises selectively operating an engine actuator that affects engine torque and engine fuel economy at the given operating condition, and extending operation of the actuator to higher engine torques as a peak engine torque for the given operating condition increases.

Abstract: To avoid the generation of a pumping loss, a communication passage is formed as a bypass passage between an exhaust port and a combustion chamber in an internal combustion engine. The communication passage is provided with a one-way valve as an exhaust gas return amount adjustment means. The one-way valve includes a spring member having a spring constant set to the value such that a valve body does not displace toward the combustion chamber under the pressure of the exhaust gas in the exhaust port. An opening degree of the one-way valve is autonomously adjusted depending on the amount of air introduced from an intake manifold when the pressure within the combustion chamber becomes negative in the intake stroke. Then inside of the combustion chamber is kept at substantially the atmospheric pressure with the exhaust gas returned to the combustion chamber via the communication passage and the aforementioned air.

Abstract: A first exhaust gas sensor signal (vls_up) of a first exhaust gas sensor (AS1) is detected. In addition, a second exhaust gas sensor signal (vls_down) of a second exhaust gas sensor (AS2) is detected. A relevant first estimated value of an emission of at least one exhaust gas component is determined in relation to a position of the first exhaust gas sensor (AS1) in the exhaust gas tract as a function of the first exhaust gas sensor signal (vls_up) and a relevant second estimated value of an emission of the at least one exhaust gas component is determined in relation to a position of the second exhaust gas sensor (AS2) in the exhaust gas tract as a function of the second exhaust gas sensor signal (vls_down). A conversion rate (K) of the at least one exhaust gas component is estimated as a function of a ratio of the second estimated value and the first estimated value of the determined emission. The exhaust gas catalytic converter is diagnosed as a function of the determined conversion rate (K).

Abstract: Disclosed is a diagnostic control apparatus for internal combustion engines capable of accurately diagnosing the presence and extent of air/fuel ratio variations in engine cylinders, even when the system has no part for detecting the air/fuel ratio in each cylinder. The diagnostic control apparatus measures the time required for the crankshaft to rotate to a specified angle for each cylinder; and based on this measured, required time, derives the 0.5 order component as the rotation fluctuation component for each two rotations of the crankshaft per each cylinder or the 1.0 order component as the rotation fluctuation component for each single rotation of the crankshaft; and also counts the number of times the 0.5 order component or 1.0 order component deviates from the preset range in the period set for each cylinder, and diagnoses an error in the output or in the air/fuel ratio for a particular cylinder when that count value exceeds a specified value.

Abstract: In an attempt to regenerate energy of exhaust gas by using a pressure regenerator secured to an exhaust port of a displacement type engine so as to realize the Atkinson's cycle, if the engine is a four-cycle engine, raising regenerative pressure may cause abnormal fuel combustion or melting damage of an exhaust valve. The present invention has successfully solved this problem by using a six-cycle engine. The six-cycle engine with a regenerator according to the present invention is capable of varying proportion of the power output that is generated by the six-cycle engine itself and that is generated by the regenerator. Using this principle enables the six-cycle engine with a generator to be used as an engine that is capable of generating two kinds of output power or as a six-cycle gas turbine with high controllability.

Abstract: The invention relates to the field of methods and devices for reducing the difference between normalized air-fuel ratio of the various cylinders compared with a predetermined value between 0.7 and 1.1, of the normalized air-fuel ratio in an internal combustion engine. The method and devices utilize the signal of the ionization current produced by a suitable device, modifying the quantity of fuel on the basis of the signal determined by means of the method in question in the invention.

Abstract: An intake system for an engine includes a duct defining an intake passage therein, and a cantilevered valve including a valve main body opening/closing the intake passage, a shaft supporting the body, and a valve extension portion. The duct includes a reduced passage portion between the duct and the body when the body is in a fully closed position, a recess accommodating the body and the extension portion when the body is fully opened, and a pressure introduction passage formed between the duct and the body when the body is fully closed, and communicating with a space between the body and the extension portion when the body is fully closed. The extension portion includes a sealing part. The duct and the sealing part define a clearance therebetween when the body is fully closed. The clearance has a smaller sectional area than the reduced passage portion.

Abstract: A machine (100) has an internal combustion engine (104) operating in response to a control signal provided by an engine governor (216). The engine (104) provides a torque output to a machine system providing a machine function. An electronic controller (214) determines a current operating state of the engine (104) and a torque utilization of the machine system, and compares the current operating state of the engine (104) with the torque utilization in an engine droop function (302). A change to an engine speed (308) setting of the engine (104) is instructed in response to a change in the torque signal. Such change is to increase the engine speed (308) setting when the torque utilization is increasing, and to decrease the engine speed (308) setting when the torque utilization is decreasing.

Abstract: To reduce the complexity of an indicating system 6 on an internal combustion engine for determining a parameter, the invention provides that on the basis of the measured variable a computing unit 8 for the indicating system 6 computes crank angle information, and on the basis of the crank angle information thus computed and the measured variable determines an engine parameter.

Abstract: An abnormality diagnosis device is for an exhaust heat recovery equipment including an exhaust heat absorption part absorbing exhaust heat from an engine, a heat release part releasing at least part of the heat absorbed by the absorption part to engine coolant, a circulation loop passing through the absorption part and the release part, the medium circulating around the loop, and an opening and closing valve disposed in the loop between the absorption part and the release part. The equipment closes the valve to stop circulation of the medium when coolant temperature is a preset temperature or above. The device includes an abnormality determination device for determining whether the valve is in an abnormal opening state based on a heat amount transmitted from exhaust heat to coolant through the equipment, when coolant temperature is the preset temperature or above and thereby the valve is closed if the valve is normal.

Abstract: On incompletion of port learning, an auto stop-permitting water temperature is set to a temperature which is higher than a temperature set on completion of the port learning and is higher than a port injection temperature as an upper limit temperature that enables an engine to be driven in a port injection drive mode. This arrangement increases the opportunity of continuing the operation of the engine with fuel injection from a port fuel injection valve without an auto stop, thus increasing the opportunity of the port learning.

Abstract: Methods and devices for controlling the normalized air-fuel ratio of an internal combustion engine, otherwise known, in technical terms, as Lambda. The present invention is based on the use of the ionization current released by a device positioned on each cylinder of the engine. This ionization current is measured by a Control Unit equipped with a low-pass filter and electronic means which implement the invention.

Abstract: The invention provides an ignition control device and a killing control device correspond. An ignition control device comprises an ignition circuit module and a killing control device corresponds. The ignition circuit module comprises a killing control device including a killing switch and a timing retard circuit module connected to the ignition circuit module. When the killing control operates, the ignition circuit stops igniting. The invention has following advantages: reasonable structure, low cost, stable control circuit and safe operation and so on.

Abstract: The present invention provides a fuel saving apparatus that provides information, such as vehicle speed, a fuel injection period, fuel efficiency and engine load, to a driver in real time, thereby enabling the driver to develop economic driving and economical driving habits.

Abstract: At the time of reference position learning for ensuring accuracy in detecting a valve timing, an operation amount of an actuator is set such that intake valve phase changes to a position of most retarded angle as a reference phase. When the intake valve phase reaches the most retarded angle and the change in the intake valve phase stops (YES at S150), it is determined that the intake valve phase has reached the reference phase and the learning is terminated normally. If the learning operation does not end normally even after the time lapse from the start of learning exceeds a limit time Tlmt, the reference position learning is terminated forcibly (YES at S170), and power supply to the actuator is stopped. Thus, power consumption can be reduced and the apparatus can be protected at the time of reference position learning.

Abstract: A control device for an internal combustion engine which, at cold starting, enables an ignition timing retard control for warm-up of a catalyst device and a speed feedback control by means of ignition timing for converging an engine speed to a target speed includes a function for comparing a final ignition timing with a retard lower limit value, and a function for changing the target speed based upon the result of the comparing. When the final ignition timing reaches the retard lower limit value, the target speed is increased by a predetermined speed and when a difference between the final ignition timing and the retard lower limit value exceeds a predetermined angle on an advance side, the target speed is decreased by a predetermined speed. In this way, at cold starting, the engine speed is early converged to the target speed while restricting rotational variations and early warm-up of a catalyst device can be certainly realized.

Abstract: A system having a particulate matter sensor in an exhaust stream of an engine upstream from a particulate filter and another such sensor downstream from the filter. There may also be an exhaust gas recirculation (EGR) control on the engine. The amount of particulate matter in or loading of the filter may be determined by the upstream filter. The working condition of the filter may be determined by the downstream sensor. The filter may have a heater and control for providing operational and particulate matter burn-off temperatures to the filter. A processor may be connected to the sensors, the EGR control and the filter heater control.

Abstract: A no-contact ignition control device includes a stop switch which maintains a second switching element at the OFF state so that an induced voltage of a trigger coil triggers a first switching element and shortcircuit a generation coil. A surge absorption element is connected in parallel to the stop switch. This configuration prevents intrusion of a surge current into the ignition control circuit caused by static electricity accumulated on the surface of casing covering electronic parts of the ignition control circuit and surely avoid dielectric breakdown of the electronic parts or malfunction of the circuit by the surge current.