Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Mitsubishi Fuso Truck & Bus Corporation

Susumu Kohketsu

Keiki Tanabe

Shinji Nakayama

Yoshiyuki Akao

Yoshimasa Matsura

Norio Nakazawa

Seijiro Kotooka

Tetsuo Takemoto

Yoshihisa Yamaki

Tetsuo Suzuki

Kazutoshi Mori

Yasunori Daigo

Eiji Mizote

Tomomi Nakagawa

Toru Kawatani

Hiroshi Jyoutaki

Youichi Ohgaki

Immediately before fuel pressure is increased by a pressure-increase mechanism, a pressure-increase control valve of each cylinder is opened in timing that does not overlap the timing of opening of an injection control valve, and the period of time for which the pressure-increase control valves is opened is gradually increased. As a result, it is possible to prevent the quantity of fuel consumed by the pressure-increase mechanism from rapidly increasing when the increase of fuel pressure is started.

Common rail fuel injection system

A failure detection apparatus for an internal combustion engine includes failure detecting means (S&#x2013;S) for detecting abnormality of fresh air quantity detecting means (air flow sensor) based on the result of comparison between a fresh air quantity detected by the fresh air quantity detecting means (air flow sensor) and a fresh air quantity reference value set by fresh air quantity reference value setting means (S), and a supercharger equipped with variable nozzles/vanes. The fresh air quantity reference value setting means sets the reference value (S) in accordance with not only the operating state (engine speed N, fuel injection quantity Q, etc.) of the engine but also a target vane opening set for the variable nozzles/vanes of the supercharger by target vane opening setting means (S, S).

Failure detection apparatus for an internal combustion engine

A failure detection apparatus for an internal combustion engine includes failure detecting means (S-S) for detecting abnormality of fresh air quantity detecting means (air flow sensor) based on the result of comparison between a fresh air quantity detected by the fresh air quantity detecting means (air flow sensor) and a fresh air quantity reference value set by fresh air quantity reference value setting means (S), and exhaust flow rate adjusting means. The fresh air quantity reference value setting means sets the reference value (S) in accordance with not only the operating state (engine speed N, fuel injection quantity Q, etc.) of the engine but also a target adjustment amount (target throttle valve opening) set for the exhaust flow rate adjusting means by target adjustment setting means (S, S).

A failure detection apparatus for an internal combustion engine includes failure detecting means (S-S) for detecting abnormality of fresh air quantity detecting means (air flow sensor) based on the result of comparison between a fresh air quantity detected by the fresh air quantity detecting means (air flow sensor) and a reference value for the fresh air quantity set by fresh air quantity reference value setting means (S), and an EGR device (EGR passage, EGR valve, target opening setting means, EGR valve control means). The fresh air quantity reference value setting means sets the reference value (S) in accordance with not only the operating state (engine speed N, fuel injection quantity Q, etc.) of the engine but also a target EGR valve opening set by target opening setting means (S, S).

A pressure-elevating type fuel injecting system selectively injects via injectors fuel stored in a common rail or fuel whose pressure is elevated by a pressure elevating mechanism into a combustion chamber, and comprises a crank angle sensor producing crank pulse signals in accordance with operating states of an engine, a pulse interval calculating unit calculating pulse intervals between respective crank pulse signals, and a determination unit determining the malfunction of the pressure elevating mechanism when a variation of the pulse interval is above a determination threshold.

Pressure-elevating type fuel injecting system

An accumulator type fuel injection system adapted to prevent engine trouble by making a judgement that fuel injection rate switching change-over valves provided correspondingly to fuel injection nozzles in cylinders, a valve for controlling the pressure in a low-pressure accumulator or means for detecting fuel pressures in accumulators gets out of order, and carrying out when any of these parts break down a control operation of a limp-home mode in which a region of an operation of an engine is limited. To provide such an accumulator type fuel injection system, a control means is formed so that, when a judgement that first control valves , a second control valve or pressure sensors for detecting the fuel pressures in the respective accumulators get out of order is given, the control means sets a discharge pressure of a fuel pump not higher than a permissible pressure in a second accumulator , and injects a fuel from fuel injection nozzles

Accumulator type fuel injection system

A pressure-elevating type fuel injecting system pressurizes high pressure fuel from a pressure accumulating chamber using a pressure-elevating mechanism and injects the pressure-elevated fuel into combustion chambers by injectors. The pressure-elevating type fuel injecting system comprises a target fuel injection quantity setting unit which sets a target fuel injection quantity, a time difference setting unit which sets a time difference between a timing for opening an injector electromagnetic valve and a timing for operating an pressure-elevating mechanism electromagnetic valve, an initial fuel injection quantity calculating unit calculating an initial fuel injection quantity on the basis of a time-dependent variation of fuel pressure and the time difference, and a final injection period setting unit which calculates an operation period of the injector electromagnetic valve, on the basis of a final fuel injection quantity and the time-dependent variation of the pressure of the pressure-elevated fuel.

The present invention relates to an EGR control unit and EGR control method for controlling an EGR adjusting apparatus, and it is an object of the invention to calculate an EGR rate at a low cost and to control an operation of the EGR apparatus with high accuracy. The EGR control unit is made up of temperature detecting devices detect in-passage temperature at least two of an intake passage, an atmospheric air introduction passage located on the upstream side of the intake passage and communicated with the atmosphere and an EGR passage, an actual EGR rate calculating device for calculating a rate of an exhaust gas to an intake gas in an internal combustion engine on the basis of information on temperatures detected by the temperature detecting devices, and an EGR controller for controlling the EGR adjusting device through the use of the actual EGR rate calculated by the actual EGR rate calculating device.

EGR control unit and EGR control method

An ECU preliminarily obtains a target supercharging pressure determined based on an engine rotational speed and an engine load, and stores the target supercharging pressure value. The ECU commands a flow passage area changing unit to set an exhaust gas flow passage area to the maximum flow passage area or the minimum flow passage area, and judges the abnormality of a supercharger by comparing supercharging pressure detected by a supercharging pressure sensor and the stored target supercharging pressure.

Variable displacement supercharging system and method for detecting abnormality of supercharging system

By setting a switching timing of switching means that connects either one of a high pressure fuel source and a low pressure fuel source to an injector earlier than a point of time when an injector finishes a high pressure fuel injection, leak fuel or return fuel is reduced and an engine load is reduced and therefore mileage is improved.

Fuel injection apparatus of engine

A common-rail injection system includes a first accumulator of high pressure and a second accumulator of low pressure. The common-rail injection system includes a post injection control device for injecting additional low-pressure fuel from the second accumulator through a fuel injection nozzle after main fuel is injected. The post injection control device injects the additional fuel the injection terminates at a first timing when the fuel pressure in either fuel passage or second accumulator lowers to a predetermined value lower than that of the high-pressure fuel or at a second timing when an exhaust stroke of the engine is completed, whichever earlier.

Accumulator type fuel injection apparatus

In a common rail system comprised of a first accumulator storing high-pressure fuel and a second accumulator storing low-pressure fuel, additional fuel is injected when a fuel pressure in a fuel passage or in the second accumulator (low inlet pressure of an injector) is reduced to a low pressure approximate to the pressure of the low-pressure fuel stored in the second accumulator after a switching valve is operated for disconnection from the fuel passage (switching valve drive signal OFF) at a point in time when a main injection control device finishes the injection of fuel (injector drive signal OFF) or after the main injection control device finishes the injection of fuel. This keeps the fuel pressure as low as possible during post injection to prevent the fuel from adhering to the wall surfaces of cylinder liners.

Accumulator fuel injection system

A controller ( ) of an accumulator fuel-injection apparatus opens a selector valve ( ) for injection rate switching for a short time between auxiliary injection and main injection, the selector valve controlling high-pressure fuel supply from a high-pressure accumulator ( ) to a fuel passage ( ) on the downstream side of a check valve ( ), whereby a fuel pressure higher than an auxiliary injection pressure and lower than a main injection pressure is formed in the fuel passage on the downstream side of the selector valve ( ). By opening, in this state, an on-off valve ( ) for injection timing control to start the main injection, a proper pressure higher than the auxiliary injection pressure and lower than the subsequent main injection pressure is established in the initial stage of main injection, improving fuel economy and exhaust-gas characteristic.

Accumulator fuel-injection apparatus

An accumulator fuel injection system for controlling an injection rate according to the operating state of an engine comprises: a first accumulation chamber for containing high-pressure fuel supplied by a fuel supply pump a first electromagnetic valve device provided in a fuel passage which connects the first accumulation chamber with a fuel injection valve the first electromagnetic valve switching the fuel passage between a connected state or a disconnected state; a branch passage branched from the fuel passage at downstream side of the first electromagnetic device the branch passage having sufficiently lower constant fuel pressure than fuel pressure in the first accumulation chamber and a second electromagnetic valve device provided in a fuel return passage connecting the fuel injection valve with a fuel tank the second electromagnetic valve device switching fuel, which is injected from the fuel injection valve between an injected state and an uninjected state; and control means for opening the first electromagnetic valve device prior to the opening of the second electromagnetic valve device and then opening the second electromagnetic valve device

Growing community of inventors

Tokyo, Japan

Susumu Kohketsu