摘要:
The disclosed internal combustion engine (1) has an electric water pump (56) and a water temperature sensor (92) that detects coolant water temperature (THW). An electronic control device (91) stops the driving of the water pump (56) when the coolant water temperature (THW) is lower than a baseline temperature (THW). Meanwhile, the electronic control device (91) drives the water pump (56) in accordance with the coolant water temperature (THW) when the coolant water temperature (THW) is higher than the baseline temperature (THW). When the driving of the water pump (56) is stopped, the internal combustion engine (1) forbids at least one engine control until the water pump (56) is driven.
摘要:
A combustion speed, for example, is estimated or evaluated, with a required accuracy, more simply than the conventional art, while reducing man-hours to produce a heat generation rate waveform of an internal combustion engine. An increase rate of a heat generation rate relative to a change in a crank angle in a heat generation rate increasing period (e.g., a first-half combustion period a ) in which the heat generation rate increases after ignition of an air-fuel mixture is defined as a heat generation rate gradient b / a that is one of characteristic values of the heat generation rate waveform. The heat generation rate gradient is estimated based on a fuel density (e.g., fuel density Á fuel@dQpeak at heat generation rate maximum time) at a predetermined time set in advance in the heat generation rate increasing period so as to produce the heat generation rate waveform using the estimated heat generation rate gradient.
摘要:
Die Erfindung betrifft ein handgeführtes Arbeitsgerät (1) und ein Verfahren zu dessen Herstellung. Das handgeführte Arbeitsgerät umfasst einen Verbrennungsmotor (2) mit einem Zylinder (3), in dem ein von einem Kolben (4) begrenzter Brennraum (5) ausgebildet ist. Der Kolben (4) treibt im Betrieb über ein Pleuel (6) eine Kurbelwelle (7) um eine Drehachse (8) der Kurbelwelle (7) rotierend an. Das Arbeitsgerät (1) umfasst eine Steuereinrichtung (13, 13', 13 ") und eine Zündeinrichtung (10). Die Zündeinrichtung (10) umfasst eine Zündkerze (12). Die Kurbelwelle (7) ist drehfest mit einem Träger für mindestens einen Signalgeber verbunden. Der Signalgeber ist an dem Träger fixiert. Die Zündeinrichtung (10) zündet unter Nutzung eines vom Signalgeber erzeugten Signals zu einem von der Steuereinrichtung (13, 13', 13") vorgegebenen Zündzeitpunkt die Zündkerze (12). Der Träger besitzt eine polygonkegelförmige Aufnahme (14). Die Kurbelwelle (7) weist einen polygonkegelförmigen Abschnitt (15) auf, der mit der polygonkegelförmigen Aufnahme (14) des Trägers korrespondiert und in der polygonkegelförmigen Aufnahme (14) angeordnet ist. Für das Verfahren weist die Kurbelwelle (7) ein Ausrichtungselement (24) auf. Der polygonkegelförmige Abschnitt (15) der Kurbelwelle (7) wird derart geschliffen, dass der polygonkegelförmige Abschnitt (15) in vordefinierter Weise zum Ausrichtungselement (24) orientiert ist.
摘要:
A control device of an internal combustion engine calculates an abnormal combustion prevention torque for preventing an abnormal combustion due to self-ignition whose heat source is a mixture of supplied fuel to the internal combustion engine and lubricant oil, on the basis of a cylinder wall temperature of the internal combustion engine or a temperature of a parameter in correlation with the cylinder wall temperature, and controls a torque of the internal combustion engine to prevent the torque of the internal combustion engine from becoming equal to or more than the abnormal combustion prevention torque.
摘要:
A combustion speed, for example, is estimated or evaluated, with a required accuracy, more simply than the conventional art, while reducing man-hours to produce a heat generation rate waveform of an internal combustion engine. An increase rate of a heat generation rate relative to a change in a crank angle in a heat generation rate increasing period (e.g., a first-half combustion period a ) in which the heat generation rate increases after ignition of an air-fuel mixture is defined as a heat generation rate gradient b / a that is one of characteristic values of the heat generation rate waveform. The heat generation rate gradient is estimated based on a fuel density (e.g., fuel density ρ fuel@dQpeak at heat generation rate maximum time) at a predetermined time set in advance in the heat generation rate increasing period so as to produce the heat generation rate waveform using the estimated heat generation rate gradient.
摘要:
A control apparatus for an internal combustion engine includes an in- cylinder pressure sensor (34) for detecting an in-cylinder pressure (P, 100). In-cylinder heat release amount data is calculated (102) based on in-cylinder pressure data synchronized with the crank angle that is sampled using the in-cylinder pressure sensor (34). If the number of items of the heat release amount data that are located in a combustion period identified using the heat release amount data is two or more (104), the control apparatus determines that the in-cylinder pressure data that is sampled in synchronization with the crank angle is reliable (106) and the engine can be controlled accordingly.
摘要:
An internal combustion engine system includes: an in-cylinder pressure sensor 30; a crank angle sensor 42; and a seal portion 34 that seals a space between an outer face of a housing 301 and a wall surface of a cylinder head 32. A slope k that is a ratio of the amount of decrease in a heat release amount Q relative to the amount of increase in a crank angle is calculated in a period during an expansion stroke from a combustion end point θ max until an opening timing of an exhaust valve 22. The existence or nonexistence of an abnormality in the sealing function of the seal portion 34 is determined based on whether or not a ratio X of the amount of decrease in the slope k to the amount of increase in an engine speed is greater than a threshold value α.
摘要:
Methods and systems for engine control optimization are provided. A first and a second operating condition of a vehicle engine are detected. An initial value is identified for a first and a second engine control parameter corresponding to a combination of the detected operating conditions according to a first and a second engine map look-up table. The initial values for the engine control parameters are adjusted based on a detected engine performance variable to cause the engine performance variable to approach a target value. A first and a second sensitivity of the engine performance variable are determined in response to changes in the engine control parameters. The first engine map look-up table is adjusted when the first sensitivity is greater than a threshold, and the second engine map look-up table is adjusted when the second sensitivity is greater than a threshold.