摘要:
In an internal combustion engine capable of selectively switching between a low temperature combustion state and an ordinary combustion state, a combustion control apparatus can suppress an amount of smoke emitted from the engine to the ambient atmosphere, and at the same time provide acceleration performance to better meet driver's requirements. The apparatus includes a map unit for calculating a maximum fuel injection amount, which is an upper limit for the amount of fuel being able to be injected into a combustion chamber, and the map unit comprises a low temperature combustion map used at the time of low temperature combustion and an ordinary combustion map used at the time of ordinary combustion, these maps being provided separately from each other.
摘要:
The present invention proposes a fuel pressure control apparatus for a high-pressure fuel injection system which sufficiently reduces a fuel pressure in an accumulator line (20) while preventing the high-pressure fuel injection system from being adversely affected. The fuel pressure control apparatus for the high-pressure fuel injection system is equipped with an accumulator line (20) for accumulating fuel supplied from a fuel pump (30) at a high pressure and supplying the fuel to fuel injection valves (12), and with a relief valve (22) for discharging fuel in the accumulator line (20). Furthermore, the apparatus is equipped with fuel pressure control means (68) for detecting a fuel pressure in the accumulator line (20) and driving the relief valve (22) so as to reduce the fuel pressure in accordance with a pressure reduction requirement based on a comparison between the detected fuel pressure and a target pressure. An electronic control unit (60) determines a detection timing of the fuel pressure in such a manner as to prevent a period during which the fuel pump (30) force-feeds fuel from overlapping with the detection timing of the fuel pressure by detection means (68).
摘要:
An electronic control unit (51) sets a split injection region in which fuel injection is divisionally performed by performing main injection and pilot injection, and an injection stop region in which fuel injection is stopped, in accordance with operational conditions of a diesel engine (1), and performs fuel injection control based on the opening and closing operation of the electromagnetic valves (3) of injectors (2). A boundary region in which only the pilot injection with an effective amount of injection secured is performed is set in a region between the split injection region and the injection stop region. This region setting avoids execution of only the main injection in a state where the pilot injection is not performed and therefore a suitable combustion environment is not secured.
摘要:
The present invention provides a method of determining abnormality, which is capable of specifying a fuel force-feed system subject to an abnormality without causing fluctuations of a fuel pressure in an accumulator line. A fuel pump (30) is provided with a first supply pump (50a) and a second supply pump (50b), and these supply pumps (50a, 50b) alternately force-feed fuel to a common rail (20). Respective fuel injection valves (12) carry out fuel injection based on a fuel pressure (rail pressure) in the common rail (20). An ECU (60) detects a rail pressure rise amount during a fuel force-feed period and calculates an estimated value of rail pressure rise amount based on a force-feed command value for the fuel pump (30). The ECU (60) determines which one of the supply pumps (50a, 50b) is in the process of force-feeding fuel in a certain fuel force-feed period, and determines individually the occurrence of an abnormality in the respective supply pumps (50a, 50b) based on the detected value and the estimated value of rail pressure rise amount.
摘要:
In order to provide a fuel injection pump capable of discriminating a cylinder, the fuel injection pump (1) capable of supplying fuel to engine (2) having a plurality of cylinders is provided with reference signal generating system (7, 35) capable of generating a plurality of reference signals corresponding to a plurality of cylinders. Of a plurality of reference signals, a specific reference signal differs from the reference signals other than said specific reference signal. The time point at which the specific reference signal is generated is related to a predetermined cylinder out of a plurality of cylinders, whereby the specific cylinder can be identified by means of a single fuel injection pump by discriminating the specific reference signal by discrimination means (71). Therefore, where the difference in fuel injection rate as to a plurality of cylinders is measured during the manufacturing process of the fuel injection pump, it becomes possible to correct the fuel injection rate to reduce the difference in the fuel injection rate by individual cylinders.
摘要:
In order to provide a fuel injection pump capable of discriminating a cylinder, the fuel injection pump (1) capable of supplying fuel to engine (2) having a plurality of cylinders is provided with reference signal generating system (7, 35) capable of generating a plurality of reference signals corresponding to a plurality of cylinders. Of a plurality of reference signals, a specific reference signal differs from the reference signals other than said specific reference signal. The time point at which the specific reference signal is generated is related to a predetermined cylinder out of a plurality of cylinders, whereby the specific cylinder can be identified by means of a single fuel injection pump by discriminating the specific reference signal by discrimination means (71). Therefore, where the difference in fuel injection rate as to a plurality of cylinders is measured during the manufacturing process of the fuel injection pump, it becomes possible to correct the fuel injection rate to reduce the difference in the fuel injection rate by individual cylinders.
摘要:
When sulfur components accumulate on an exhaust gas control catalyst (36a, 38a), a PM accumulation amount PMsm is increased and the frequency with which a lean-burn temperature increase routine is executed under fine particle regeneration control is increased (step S102). As a result, the sulfur components accumulated on the exhaust gas control catalyst (36a, 38a) are released using the lean-burn temperature increase routine of the fine particle regeneration control. Therefore, even when sulfur poisoning is so excessive that the engine operating state does not come into the sulfur poisoning recovery control execution range, the lean-burn temperature increase routine of the fine particle regeneration control can be executed so that the excessive sulfur components on the exhaust gas control catalyst (36a, 38a) can be released by executing this lean-burn temperature increase routine. Because the sulfur components released by executing the lean-burn temperature increase routine are excessive sulfur components that have accumulated on the exhaust gas control catalyst (36a, 38a) and the frequency with which the lean-burn temperature increase routine is executed is high, it is possible to keep down the concentration of sulfur components that are released.