Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Other

Keizo Hiraku

Hideki Suzuki

Hiroshi Kanai

Hirohiko Yamada

Akira Hashizume

Toru Kidokoro

Noboru Takagi

Takashi Tsunooka

Kiyoo Hirose

Naohide Fuwa

Yukihiro Nakasaka

Toshiki Annoura

Nobuhiko Koga

Naoki Takahashi

Takahiko Fujiwara

Masahiko Takeuchi

Kaoru Ohtsuka

Tadashi Suzuki

Masakazu Yamada

Yuji Miyanoo

Yusuke Kawamura

Akemi Satou

Tomoyuki Kaga

Takahiro Yamanashi

Takashi Yui

Kazuki Sato

Takahiro Fujiwara

An exhaust gas purification catalyst includes: a lower catalyst layer that contains a ceria-zirconia mixed oxide having 50 to 70 mass % of CeOand 5 mass % or more of PrOand carries at least one of Pt and Pd; and an upper catalyst layer that contains at least zirconia and carries at least Rh, wherein the total amount of CeOper liter of the carrier base is 15 to 30 g. Because the amount of CeOis small, formation of HS is suppressed and a high capability of adsorbing and releasing oxygen is brought out in spite of the small amount of CeO.

Exhaust gas purification catalyst

An engine has a variable valve actuation mechanism that varies lift characteristics of an intake valve. An idle speed control apparatus has a control section for controlling an intake air amount of the engine in an idle state for adjusting an actual engine speed to a target engine speed. The control section sets a control amount related to control of the intake air amount in correspondence with the lift characteristics, which are varied by the variable valve actuation mechanism. Accordingly, the engine speed in the idle state is effectively controlled in correspondence with changes of the lift characteristics.

Apparatus and method for controlling idle speed of internal combustion engine

A combustion condition for each of plural cylinders included in an internal combustion engine is set by the following control that is performed according to an intake air amount in each of the plural cylinders. A reference cylinder is set to a cylinder in which the intake air amount is smallest, and a fuel injection amount for the reference cylinder is set to a fuel injection amount for realizing a stoichiometric air-fuel ratio. The air-fuel ratio in each of the cylinders other than the reference cylinder is set according to the intake air amount in each of the cylinders such that the torque equal to reference torque generated in the reference cylinder is generated. When this setting is performed, air-fuel ratios that are out of a predetermined region in the vicinity of the stoichiometric air-fuel ratio (i.e., air-fuel ratios that are in an avoidance region) are excluded. With respect to a cylinder in which the torque equal to the reference torque cannot be generated only by setting the air-fuel ratio, correction of the ignition timing is further performed so as to suppress a difference between the torque generated in the cylinder and the reference torque.

Internal combustion engine including plural cylinders, control apparatus and control method for internal combustion engine including plural cylinders

A control device of a multicylinder internal combustion engine provided with a valve operating characteristic control means for controlling a valve operating characteristic of at least one of an intake valve and exhaust valve, which estimates an intake difference of cylinders and limits a control range of said valve operating characteristic in accordance with said estimated intake difference.

Control device for multicylinder internal combustion engine

An ignition timing control apparatus for an engine includes a controller that sets an ignition timing considering a change of a temperature or a pressure in a combustion chamber at a time when an opening/closing characteristic of an intake valve is changed, the opening/closing characteristic including a valve opening timing and a valve closing timing at least one of which is changed by a variable valve mechanism for the engine.

Ignition timing control apparatus for engine

An controller detects a change in a load generation state of an accessory device that generates a load on the internal combustion engine during operation, and the controller in turn controls a variable valve mechanism to change at least one of an operation angle and a valve lift of an intake valve of the internal combustion engine, as well as changing an amount of an intake air drawn into the internal combustion engine, in response to the detected change in the load generation state of the accessory device.

Idling speed control system and method

If a valve timing adjusting mechanism has a problem, an ECU determines whether or not actual valve timing VTa is larger than valve timing advanced angle limit value VTegr. Depending on the determination, the ECU selects a value for target valve operating angle VLt from safety angles including intermediate valve operating angle VLmid and maximum valve operating angle VLmax. Each of the safety angles VLmid, VLmax is a valve operating angle at which engine combustion is stabilized at the current valve timing. With the valve operating angle fixed at the safety angle VLmid or VLmax, a throttle valve controls intake air amount. This prevents the engine combustion from becoming unstable, thus enabling the engine to be operated in an engine safety mode.

Intake air amount control apparatus and intake air amount control method for internal combustion engines

An inter-bank variation detection device of an internal combustion engine provided with a valve opening characteristic setting means () for changing the valve opening characteristic of an intake valve () for each of the cylinders (#1 to #4) or each of the bank (BL, BR); an indicator detecting means for detecting indicators of the state of combustion for each bank at the time of a first valve opening characteristic set by the valve opening characteristic setting means and the time of a second valve opening characteristic smaller than the first valve opening characteristic; a fuel injection amount variation detecting means () for detecting variation of the fuel injection amount for each bank by using the indicator (Xfn) detected by the indicator detecting means at the time of the first valve opening characteristic; and a valve opening characteristic variation detecting means () for detecting variation of the valve opening characteristic for each bank by using the indicator (Xsn) detected by the indicator detecting means at the time of the second valve opening characteristic and the variation of the fuel injection amount detected by the fuel injection amount variation detecting means is provided. It is also possible to change the valve opening characteristic of the intake valve by the valve opening characteristic setting means so that the variation of valve opening characteristic for each cylinder or each bank is eliminated.

Inter-cylinder variation detection device and inter-bank variation detection device of internal combustion engine

The power circuit device for vehicles is provided with a grounding portion for grounding portions closer to a power consumption device side than a relay of main conductive routes when the relays used for the main conductive routes extending from an accumulator of a vehicle to a fuel heating device, a catalyst heating device, an electric pump, or the like is turned OFF, so that a false power application is not executed even a short-circuit occurs in a part of a power circuit. Also, when two relays are arranged in series, the grounding portion is provided for the relay closer to the power consumption device in order to monitor a voltage level of the main conductive route and make it easy to detect a short-circuit or a disconnection occurrence.

Power circuit device for vehicles and control method thereof

An engine is provided with a variable valve mechanism capable of changing a degree of an operating angle and a phase of a valve-open period of an intake valve. A controller selectively executes at least one of a plurality of knock controls including a phase adjustment of the valve-open period of the intake valve when a knocking is detected by a knock sensor. When the operating angle of the intake valve is smaller than 180 degrees, a knock control is selected and executed such that a valve-open timing IVO of the intake valve does not exceed a predetermined timing (TDC+&#x3b1;) retarded from a top dead center TDC by a predetermined angle &#x3b1;. Specifically, for example, when the operating angle is smaller than 180 degrees and the valve-open timing IVO of the intake valve is after the top dead center TDC, the valve-open timing IVO is advanced.

Control system and method for internal combustion engine with variable valve mechanism

An intake air amount control apparatus for an internal combustion engine is provided with: an opening control mechanism and a variable valve mechanism, which control an intake air amount; an intake characteristics change mechanism for controlling the intake air amount by adjusting a parameter or parameters different from those of the above two mechanisms; and an intake amount control device for performing a cooperative control of these mechanisms upon the occurrence of any normal condition. The intake air amount control apparatus is also provided with: an abnormality detection device for detecting an abnormal condition in these three mechanisms; and a fail-safe device for controlling the intake air amount of the opening control mechanism out of these three mechanisms and controlling the other two mechanism, so as to fix their control amounts to constant values.

Intake air amount control apparatus and method of internal combustion engine

To detect a failure of the fuel heaters of a multi-cylinder internal combustion engine of vehicles by utilizing a microcomputer of a vehicle operation control device and sensors already provided in the vehicle such as an air/fuel ratio sensor or a crankshaft rotation sensor, with a supplement of substantially only a software, a failure of the heater corresponding to one of the cylinders is detected based upon a change exhibited in at least one parameter with regard to the operating conditions of the engine such as exhaust air/fuel ratio, crankshaft rotation angular speed, etc. by the injected fuel not having been heated as expected by a predetermined operation of each heater.

Method for detecting failure of injection fuel heaters of internal combustion engine

In a control system of an internal combustion engine including an intake flow control valve disposed downstream of a throttle valve, a controller controls opening and closing of the intake flow control valve, depending upon an operating state of the internal combustion engine. Upon detection of a failure in the intake flow control valve, the controller controls an intake air amount or flow rate to a different value.

Control system and method for internal combustion engine

An intake device of an internal combustion engine is provided that includes an intake flow control valve shaped so as to be capable of effectively forming a tumble flow within a combustion chamber when there is a projection within an intake pipe located downstream of the intake flow control valve. The intake device of the internal combustion engine includes an intake flow control valve between a throttle valve provided within an intake pipe and a fuel injector located downstream of the throttle valve, for producing a tumble flow in a combustion chamber. The intake flow control valve includes a valve body. The valve body has a bypass airflow producing portion formed at a position corresponding to that of the fuel injector (i.e., a projection within the intake pipe) when viewed in a flow direction of the airflow. The valve body is shaped to have a projection, thereby allowing an airflow formed by the intake flow control valve to bypass the projection within the intake pipe located downstream of the intake flow control valve.

Intake device for an internal combustion engine and method thereof

A warm-up control apparatus of an internal combustion engine is installed in a vehicle equipped with a brake booster that uses a negative pressure in an intake pipe of the internal combustion engine. The apparatus performs a warm-up control of the engine by retarding the ignition timing and increasing the amount of intake air. If during execution of the warm-up control, the brake pedal is operated, or the accelerator is off while the vehicle is running at or above a predetermined speed, or the decreasing rate of the amount of accelerator operation is greater than or equal to a predetermined value while the vehicle is running at or above a predetermined speed, the control apparatus recovers the intake pipe negative pressure by reducing the amount of intake air set in relation to the warm-up control.

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Nishikamo-gun, Japan

Keizo Hiraku