Toyota Jidosha Kabushiki Kaisha

Keiko Hasegawa

Mamoru Tomatsuri

Toshio Inoue

Keita Fukui

Katsuhiko Yamaguchi

Daigo Ando

Naoto Suzuki

Osamu Harada

Takahiro Nishigaki

Shunsuke Fushiki

Kazuhiro Ichimoto

Naoki Kurata

Tsukasa Abe

Yukio Kobayashi

Ikuo Ando

Kazuyuki Tokuda

Koji Morita

Takuji Matsubara

Yukihiro Sonoda

Yusuke Nakayama

Katsuiko Yamaguchi

When the engine being in an idling operation and it is in a running state (S, S), a value 1 is set to a learning-determination flag F(step S) and the learning of the idling control value is performed when the transmission is in the state of Lo gear and it is not immediately after a Hi-Lo shifting has been performed (Sto S).

Vehicle and control method thereof

In a hybrid vehicle, when a deceleration demand based on accelerator-off is made in selecting an S position that allows arbitrary selection of shift positions SPto SP, and fuel cut cannot be prohibited from a state of a battery, an engineand motors MGand MGare controlled so that a driving force based on a torque demand Tr* is outputted with the fuel cut (Steps S, S, Sto S). When the deceleration demand based on the accelerator-off is made in selecting the S position, and the fuel cut can be prohibited from the state of the battery, the engineand the motors MGand MGare controlled so that the enginesubstantially performs self-sustaining operation at a target rotation speed Neand a driving force based on the torque demand Tr* is outputted (Steps Sto S).

Hybrid vehicle and control method of the same

In an engineincluding an in-cylinder injector, the valve timing of an intake valve is retarded by VVT (Variable Valve Timing) controlled by an engine ECU to decompress in a combustion chamber at engine startup. In accordance with a configuration in which the valve timing of intake valve is advanced in a stepped manner from an initial set value, fuel injection from in-cylinder injector is inhibited during the time when the advance is equal to or below a predetermined standard value, and fuel injection from in-cylinder injector is allowed when exceeding the predetermined standard value, whereby degradation in the exhaust emission level in accordance with start time decompression control can be suppressed.

Control apparatus for internal combustion engine

The technique of the invention determines whether input data for driving and controlling a cooling fan have any abnormality (steps Sand S), sets an actual drive level F* of the cooling fan to a high level (Hi) in the event of detection of any abnormality (step S), and controls a fan motor to drive the cooling fan at the set drive level F* (step S). This arrangement effectively prevents a temperature rise to an abnormally high level in any of an engine and motors even in the event of any abnormality arising in the input data.

Cooling system, control method of the same, and motor vehicle

In a vehicle incorporating an internal combustion engine having in-cylinder injectors and intake manifold injectors and performing engine intermittent operation control, at the end of vehicle operation, the fuel pressure is decreased in both a high-pressure delivery pipe and a low-pressure delivery pipe by actuation (opening) of an electromagnetic relief valve and by stop of operation of a low-pressure fuel pump. This prevents deterioration in emission performance at the next engine start attributable to fuel leakage due to degradation in oil tightness of the injectors during the operation stop period. When the engine is temporarily stopped by engine intermittent operation control, while the low-pressure fuel pump is stopped, actuation (opening) of the electromagnetic relief valve is prohibited. At the engine restart after temporary stop, the fuel in the high-pressure delivery pipe having its pressure secured at a certain level is injected to quickly start the engine.

Control apparatus for vehicle

A low-pressure delivery pipe provided with intake manifold injectors, a fuel pressure regulator, a high-pressure fuel pump, a high-pressure delivery pipe provided with in-cylinder injectors, and an electromagnetic relief valve are connected in series at the downstream of a low-pressure fuel pump that discharges a fuel within a fuel tank at a prescribed pressure. Since the low-pressure delivery pipe is arranged downstream of the low-pressure fuel pump, the fuel pressure within the low-pressure delivery pipe is lowered upon stop of vehicle operation, in response to stop of the low-pressure fuel pump. The fuel pressure within the high-pressure delivery pipe is also lowered in response to stop of the low-pressure fuel pump, by opening the electromagnetic relief valve upon stop of vehicle operation. Thus, oil tightness of the injectors during the stop of vehicle operation is ensured.

Fuel supply system for internal combustion engine

The start control procedure of the invention lags an open-close timing VVT of an intake valve, restricts a throttle opening TH of a throttle valve, and starts cranking an engine with a lower torque Tlow. When a pressure Pf of a fuel supplied to in-cylinder fuel injection valves reaches or exceeds a preset reference value, which is greater than a sum of an in-cylinder compression pressure Pin and a closed valve position-retaining pressure Pcv of the in-cylinder fuel injection valves, the start control procedure cranks the engine with a standard cranking torque Tset. The start control procedure then starts advance of the open-close timing VVT of the intake valve, cancels the restriction of the throttle opening TH, and starts fuel injection from the in-cylinder fuel injection valves. This arrangement enables the fuel pressure Pf to quickly rise to or above the sum of the in-cylinder compression pressure Pin and the closed valve position-retaining pressure Pcv, and thereby effectively prevents the in-cylinder fuel injection valves from being inadequately opened.

Internal combustion engine system and starting method of internal combustion engine

In hybrid vehicle, when the shift position SP is set to the S position at which a driver is allowed to select any one of the shift positions SPto SP, and it is determined that warm-up of a purifying device has not been completed, the target air-fuel ratio AF* is set based on the S position/low coolant temperature-time target air-fuel ratio setting map. The air-fuel ratio AF* set based on the S position/low coolant temperature-time target air-fuel ratio setting map tends to be richer than the target air-fuel ratio AF* set based on any one of the normal-time target air-fuel ratio setting map and the D position/low coolant temperature-time target air-fuel ratio setting map that are used when the D position is selected.

Hybrid vehicle and method for controlling hybrid vehicle

The auto engine start control of the invention regulates a throttle valve to a restricted opening to reduce an air intake flow at an ordinary start of an engine (step S). When the driver stamps on an accelerator pedal to raise an engine power demand Pe* to or above a preset threshold value Pref, the auto engine start control regulates the throttle valve to a standard opening to ensure the air intake flow corresponding to the engine power demand Pe* (step S) and thereby cranks the engine. This arrangement desirably dampens potential vibration induced by ignition at the ordinary start of the engine, while ensuring prompt output of the required driving force from the engine under the condition of the higher engine power demand Pe*.

Auto start-stop device for internal combustion engine and motor vehicle equipped with auto start-stop device

A temporary increase in an amount of fuel at start of an engine is controlled on the basis of an estimated amount of fuel that has adhered to the perimeter of intake ports at start of the engine. If the engine is restarted soon after being stopped, the increase in the amount of fuel is reduced by a correction amount that is reduced gradually with the lapse of time. If only a considerably short length of time has elapsed, the amount of fuel is not increased. If the engine is started twice within a short period, the increase in the amount of fuel at the latter start of the engine changes continuously from the increase in the amount of fuel at the former start of the engine.

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Toyota, Japan

Keiko Hasegawa