Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Mitsubushi Denki Kabushiki Kaisha

Morio Fujiwara

Tatsuhiko Takahashi

Atsuko Hashimoto

Satoshi Wachi

Koji Wada

Hitoshi Inoue

Teruaki Kawakami

Akiyoshi Katayama

Ryohei Takahashi

An ion current corresponding to an amount of ion produced by combustion of air fuel mixture in a combustion chamber of an internal combustion engine is detected and an ion current parameter indicative of combustion state is calculated from the ion current. The properties of fuel are determined by a change of combustion state from an engine start time, that is, by a change of the ion current parameter.

Internal combustion engine control device

An ignition timing control apparatus can obtain high output torque without generating output torque loss, and avoid the deterioration of audibility due to successive knock occurrences. A cylinder specific ignition timing setting section includes a reference ignition timing control section, and a cylinder specific correction value setting section having correction values of the same number as that of engine cylinders. The reference ignition timing control section calculates reference ignition timing common to all the cylinders and uniformly controls the ignition timings of all the cylinders to a retard angle side to prevent the occurrence of successive knocks. The cylinder specific correction value setting section calculates cylinder specific correction values to compensate for variation in the cylinder specific optimal ignition timings, and sets the cylinder specific correction values for cylinders other than those whose knock frequency becomes equal to a predetermined value or more so as to advance their ignition timings.

Ignition timing control apparatus for internal combustion engine

The valve timing control system of the present invention comprises an actuator for changing an actual valve timing of an intake valve or an exhaust valve; an oil pressure adjusting unit for supplying operating oil to the actuator, and adjusting the oil pressure thereof; an actual valve timing control unit for controlling the actuator by controlling the oil pressure adjusting unit, so that the actual valve timing follows up a target value; and an oil temperature estimation unit for estimating the temperature of the operating oil, according to an operating state of the internal combustion engine from a previous operation, and according to its current operating state. Based on the estimated oil temperature, the actual valve timing control unit switches a control amount for controlling the oil pressure adjusting unit.

Valve timing control system for an internal combustion engine

A valve timing control system for an internal combustion engine for preventing hitching of a lock pin of an actuator at the time of changing a cam angle is provided. The valve timing control system is provided with actuators and connected to cam shafts C and C, hydraulic pressure supply units and for driving the actuators, and a controller A for controlling a hydraulic pressure for the actuators in dependence on engine operation states while changing a relative phase of the cam shafts relative to crank shafts. The actuator includes a locking mechanism for setting the relative phase to a lock-up position, and an unlocking mechanism for releasing the locking mechanism in response to a predetermined hydraulic pressure. The controller executes a releasing operation of the locking mechanism if the lock-up position in the locking mechanism changes from inside a predetermined range to outside the predetermined range.

Valve timing control system for internal combustion engine

A valve timing control system for an internal combustion engine for preventing dispersion of a control amount and unexpected release of a lock pin is provided. The valve timing control system is provided with actuators and connected to cam shafts C and C, hydraulic pressure supply units and for driving the actuators, and a controller A for controlling a hydraulic pressure for the actuators in dependence on engine operation states while changing a relative phase of the cam shafts relative to crank shafts. The actuator includes a locking mechanism for setting the relative phase to a lock-up position, and an unlocking mechanism for releasing the locking mechanism in response to a predetermined hydraulic pressure. The controller makes a limit of control range small when the controller drives the locking mechanism to control the relative phase within a predetermined range of the lock-up position.

A valve timing control system for accelerating activation of a catalytic converter in an internal combustion engine in a cold starting operation mode while enhancing control accuracy by learning a reference position of a cam angle. The system includes actuators ( ) coupled to cam shafts ( C; C), respectively, hydraulic pressure supply means ( ) for driving the actuators ( ), and a controller ( A) for controlling hydraulic pressure fed to the actuators ( ) in dependence on engine operation states to change phases of the cam shafts ( C; C) relative to a crank shaft ( C). The controller ( A) is so designed as to set a valve timing to a most advanced position or alternatively to a most retarded position in a cold-state idling operation mode for the purpose of learning a reference position.

A valve timing control apparatus for an internal combustion engine is capable of ensuring good response within a control range, stability outside the control range, and durability without increasing the capacity of electric power for a drive circuit and an OCV coil. The valve timing control apparatus includes an intake vale , an exhaust valve , an engine operating condition detecting section ( ), a target valve timing calculating section , variable valve timing mechanisms , an actual valve timing detecting section ( ), a control amount calculating section for calculating a control amount based on target valve timing, actual valve timing and engine operating conditions, and an actual valve timing control section ( ) for outputting the control amount as an output control amount to the variable valve timing mechanisms. When the target valve timing is outside a prescribed control range, the control amount calculated by the control amount calculating section is not made as an output control amount supplied to the actual valve timing control section ( ).

Valve timing control apparatus for internal combustion engine

A valve timing control system for an internal combustion engine for preventing dispersion of a control amount and unexpected unlocking of a lock pin is provided. The valve timing control system is provided with actuators and connected to cam shafts C and C, hydraulic pressure supply units and for driving the actuators, and a controller A for controlling a hydraulic pressure for the actuators depending on operating states while changing a relative phase of the cam shafts relative to crank shafts. The actuator includes a locking mechanism for setting the relative phase to a lock-up position and unlocking mechanisms for unlocking the locking mechanism in response to a predetermined hydraulic pressure, and the controller restricts a control of valve timing within a predetermined range of said lock-up position in the locking mechanism.

A valve timing control system for an internal combustion engine for improving engine starting performance by controlling an actuator to a lock-up position upon stopping of the engine and fixing the actuator positively at the lock-up position by a locking mechanism. The control system ( A) includes a power supply interruption detecting means ( ) for detecting a time point when electric power supply is interrupted, a desired valve timing setting means ( A) for setting a desired valve timing (VTo) on the basis of engine operation state (D), and an actual valve timing control means ( A) for driving the actuator ( ) so that the actual valve timing (VTA) coincides with the desired valve timing (VTo). An oil supply means ( ) for supplying a hydraulic pressure to the actuator is controlled over a predetermined time period from the power supply interruption time point in response to a result of detection of the power supply interruption detecting means ( ) for thereby allowing the actuator ( ) to be retained at the lock-up position.

A control system for an internal combustion engine which can judge and detect a failure of a valve, timing changing unit regardless of operating conditions. The system includes a second storage unit,for storing the detection value of an actual valve timing detection unit,when the target advance angle set by a target advance angle setting device,is a predetermined value and updating the storage value, a storage value update inhibiting unit,for inhibiting the update of the storage value of the second storage unit when a change in the storage value updated by a first storage unit,is larger than a predetermined value, and failure judging unit,A for judging a failure of the valve timing changing unit based on the target advance angle set, the detection value of the actual valve timing detection unit and the storage value of the second storage unit.

Control system for internal combustion engine

A control system for an internal combustion engine which can judge and detect a failure of a valve timing changing unit regardless of operating conditions. The system includes a second storage unit,for storing the detection value of an actual valve timing detection unit,when the target advance angle set by a target advance angle setting device,is a predetermined value and updating the storage value, a storage value update inhibiting unit,for inhibiting the update of the storage value of the second storage unit when a change in the storage value updated by a first storage unit,is larger than a predetermined value, and failure judging unit,A for judging a failure of the valve timing changing unit based on the target advance angle set, the detection value of the actual valve timing detection unit and the storage value of the second storage unit.

Growing community of inventors

Tokyo, Japan

Morio Fujiwara