Toyota Jidosha Kabushiki Kaisha

Yukihiro Nakasaka

Daisuke Akihisa

Eiichi Kamiyama

Daisaku Sawada

Naohide Fuwa

Toshiaki Asada

Shinji Sadakane

Yoshihiro Sakayanagi

Hiroshi Kanai

Hiroyuki Tanaka

Keizo Hiraku

Naoto Hisaminato

Takashi Kawasaki

Akira Hashizume

Mamoru Yoshioka

Rentaro Kuroki

Koichi Kimura

Hiroki Murata

Takashi Tsunooka

Fumito Chiba

Yoshiyuki Yamashita

Tomoyuki Kaga

A control device for controlling an internal combustion engine equipped with an engine body, a variable compression ratio mechanism A configured to be able to change a mechanical compression ratio of the engine body, and an intake system configured to be able to make exhaust discharged from combustion chambers of the engine body be recirculated to an intake passage of the engine body. The control device is provided with a compression ratio control part controlling the variable compression ratio mechanism A so that the mechanical compression ratio becomes the target compression ratio. The compression ratio control part sets the target compression ratio at a lower value when exhaust is being recirculated at a predetermined operating region at an engine low load side than when exhaust is not being recirculated.

Control device for internal combustion engine

An internal combustion engine includes a turbocharger, a variable valve timing mechanism, a variable compression ratio mechanism, and an electronic control unit that controls the variable compression ratio mechanism such that the mechanical compression ratio becomes a target mechanical compression ratio and controls the variable valve timing mechanism such that the valve closing timing of the intake valve becomes a target valve closing timing. The electronic control unit brings the target valve closing timing close to an intake bottom dead center and make the target mechanical compression ratio low, compared to a steady state after the intake pressure reaches a target pressure, in a transient state before the intake pressure reaches the target pressure in a case where the intake pressure is increased to the target pressure higher than an atmospheric pressure by the turbocharger.

Internal combustion engine

An in-cylinder pressure sensor is provided. It is determined whether a cylinder for which the in-cylinder air-fuel ratio is to be calculated is a rich cylinder or a lean cylinder. A polytropic index in the expansion stroke is calculated from the in-cylinder pressure detected by the in-cylinder pressure sensor. The calculated polytropic index m is corrected based on an operational condition parameter of an internal combustion engine. An in-cylinder air-fuel ratio is calculated based on the corrected polytropic index m in the expansion stroke, the result of the determination of whether the cylinder is a rich cylinder or a lean cylinder, and an m-A/F curve.

Air-fuel ratio detection device for internal combustion engine

An internal combustion engine having a plurality of cylinders comprises a variable compression ratio mechanism A able to change a mechanical compression ratio. The control device comprises a compression ratio detector for detecting a mechanical compression ratio based on a value of the relative position parameter representing a relative positional relationship between the cylinder blockand a pistonand a compression ratio controller for feedback controlling the mechanical compression ratio so that the mechanical compression ratio becomes a target mechanical compression ratio. In feedback controlling the variable compression ratio mechanism, the compression ratio controller does not use the mechanical compression ratio detected by the compression ratio detector when a crank angle is in a predetermined crank angle range including a time period where the cylinder pressure is equal to or greater than a preset predetermined pressure at least at one cylinder among the plurality of cylinders.

Control device and control method of internal combustion engine

A control system comprising a variable valve timing mechanism (B) able to set a closing timing of an intake valve (), a fuel injector () for feeding fuel to a combustion chamber (), an intake air amount detector () for detecting an amount of intake air fed to an intake passage from the outside air, and a pressure sensor () for detecting the pressure in the intake passage downstream of a throttle valve (). When air in the combustion chamber () is blown back to the intake passage when injection of fuel is restarted after the fuel injection is stopped at the time of deceleration operation, the basis for calculation of the fuel injection amount in the initial cycle when fuel injection is restarted is switched from the amount of intake air detected by the intake air amount detector () to the pressure in the intake passage detected by the pressure sensor ().

Control system of internal combustion engine

A control system for an internal combustion engine is provided with a crankshaft, an intake camshaft with an intake cam, a timing chain, an intake variable valve timing mechanism configured to be able to change at least one of an opening timing and closing timing of an intake valve by controlling a phase of the intake cam, and an electronic control unit configured to set in advance a periodic correction coefficient to vibrate by a period identical to a rotational period of the timing chain and to control the intake variable valve timing mechanism by the periodic correction coefficient to make the phase of the intake cam a target phase.

Control system for internal combustion engine

A diagnostic system for an internal combustion engine includes an in-cylinder pressure sensor and an ECU. The ECU is configured to: (a) determine whether each cylinder of the evaluation target cylinder group is a lean cylinder; (b) estimate a degree of leanness of the air-fuel ratio of the present lean cylinders when the lean cylinders are present in the evaluation target cylinder group; (c) calculate a polytropic index in an expansion stroke for each cylinder; (d) correlate relationship information for defining a relationship between the polytropic index in the expansion stroke and an air-fuel ratio index value with the polytropic index in the expansion stroke of a reference lean cylinder; and (e) calculate the difference in air-fuel ratio between cylinders on the basis of the polytropic index of the reference lean cylinder, the relationship information correlated with the polytropic index of the reference lean cylinder.

Diagnostic system for internal combustion engine

In the present spark ignition internal combustion engine, a shortest self-ignition delay time &#x3c4;min for a maximum cylinder internal pressure Pmax and a maximum cylinder internal temperature Tmax when equivolume combustion is realized is calculated by using a calculation formula which uses a cylinder internal pressure and a cylinder internal temperature to calculate an self-ignition delay time, and a knock limit ignition timing ITA is determined based on the calculated shortest self-ignition delay time.

Spark ignition type internal combustion engine

A base in-cylinder volume is corrected by a learned value to calculate a corrected in-cylinder volume. A difference of a crank angle which gives the corrected in-cylinder volume and the base crank angle is calculated as a 'crank angle correction value', and a base ignition timing is corrected by the crank angle correction value and feedback correction value. An in-cylinder volume at a crank angle where a combustion ratio became a set ratio at the previous combustion is calculated as a 'previous in-cylinder volume VFp', a difference &#x394;VFp of the previous in-cylinder volume VFp with respect to the base in-cylinder volume VBp at the previous combustion is calculated, and the learned value &#x394;VL is updated based on the in-cylinder volume difference VFp.

Ignition timing control system for a spark ignition type internal combustion engine

A control apparatus for an internal combustion engine of the present invention switches a steady-state characteristic that defines a relation between an engine load factor and a throttle opening degree between a high atmospheric pressure steady-state characteristic and a low atmospheric pressure steady-state characteristic in accordance with whether or not the atmospheric pressure is higher than a predetermined value. According to the low atmospheric pressure steady-state characteristic, a throttle opening degree corresponding to an identical engine load factor is set to a smaller value compared to the high atmospheric pressure steady-state characteristic in a medium load region, and the throttle opening degree is set so as to increase as the engine load factor increases towards a full load in a region on the side of a higher load factor than the medium load region.

Control apparatus for internal combustion engine

There is provided an ignition timing control device for an internal combustion engine capable of appropriately performing knock learning by performing knock learning adapted to an engine combustion phenomenon. The inventor has found the principle of a knock reduction effect due to ignition retard is that 'if a combustion period moves toward the retard side, a cylinder volume during the combustion period increases, resulting in curbing of rise in the temperature and pressure of unburned gas'. An ignition timing control device according to the present invention is capable of new knock learning based on the principle, which learns a 'cylinder volume rate'. The cylinder volume rate is a parameter determined from the amount of change in cylinder volume. Even when an operational status changes, learned ignition timing obtained from knock control means can be set to an appropriate value by reflecting the learned cylinder volume rate.

Ignition timing control device for an internal combustion engine

A control pattern corresponding to a ultra high expansion cycle is executed, wherein an actual timing IVCa of an intake valve closing timing is controlled to agree with a steady adapted value IVCt, an actual value &#x3b5;ma of a mechanical compression ratio is controlled to agree with a steady adapted value &#x3b5;mt, and an ignition timing SA is controlled to agree with a steady adapted timing SAt. There are four cases that might be generated, including a case in which the IVCa is shifted toward a retard angle side or toward an advance angle side from the IVCt due to a response delay of a variable intake valve timing apparatus, and a case in which &#x3b5;ma is shifted to a greater side or to a smaller side from the &#x3b5;mt due to the response delay of a variable compression ratio mechanism.

Control apparatus of internal combustion engine

An internal combustion engine which is provided with a variable compression ratio mechanism which can change a mechanical compression ratio and a variable valve timing mechanism which can control a closing timing of an intake valve. A target operating point which can be reached after a fixed time without entering no-entry regions from the current operating point toward an operating point which satisfies the demanded intake air amount is calculated for an operating point which shows a combination of the mechanical compression ratio and the closing timing of the intake valve when the demanded intake air amount changes, and the mechanical compression ratio and the closing timing of the intake valve are made to change toward this target operating point.

A high expansion ratio internal combustion engine includes: a variable compression ratio mechanism that varies a mechanical compression ratio of the internal combustion engine; and a variable valve train in which some valve(s) of a plurality of intake valves is phase-variable and the remaining valve(s) is phase-fixed, the variable valve train being configured such that a working angle of the phase-variable intake valve is larger than a working angle of the phase-fixed intake valve, wherein a valve-open timing of the phase-variable intake valve is retarded after a valve-open timing of the phase-fixed intake valve when the internal combustion engine is under low-load operating state.

High expansion ratio internal combustion engine

A control device applied to a system having an engine configured such that an expansion ratio can be changed is characterized to comprise an expansion ratio acquisition part for acquiring the expansion ratio, and a temperature estimation part for estimating a temperature of an exhaust gas discharged from the engine or a member positioned in a passage for the exhaust gas.

Growing community of inventors

Suntou-gun, Japan

Yukihiro Nakasaka