Mazda Motor Corporation

Mitsubishi Electric Corporation

Denso Corporation

Mazda Motor Corporat Ion

Takafumi Nishio

Takahiko Ono

Takahiro Yamamoto

Toshiaki Nishimoto

Yugou Sunagare

Kazuhiro Nishimura

Toshiaki Maruo

Takaya Okugawa

Kyohei Yasuda

Satoshi Watanabe

Hideki Hagari

Kouichi Miyamoto

Junichi Inoue

Yasushi Nakahara

Tomomi Watanabe

Michihisa Yokono

Masayoshi Higashio

Masanori Hashimoto

Tatsuya Takahata

Katsuhide Akimoto

Takuo Watanuki

Akihiro Noda

Einosuke Suekuni

Shuhei Tsujita

Tooru Matsumoto

Takahito Masuko

Junji Umemura

Nobuhiko Yokoyama

Takano Nakai

Yasunori Matoba

Shin Miura

Kuniaki Wada

Yuri Sakamoto

Takayoshi Fujita

Yuki Sato

Tomohiro Kanaya

Mitsuyuki Murotani

Souichirou Chabata

Ryo Teramoto

Keita Takagi

Tatsuhiro Ito

The control section of a control apparatus executes a first control for operating a voltage application section such as to cause a current to flow in a first direction through a gas sensor in a first period, and a second control for operating the voltage application section such as to cause a current to flow in a second direction, opposite to the first direction, through the gas sensor in a second period. The control apparatus changes the length of at least one of the first period and the second period based on a comparison between a first measurement value, which is the absolute value of a value measured by a sweep measurement section during execution of the first control, and a second measurement value, which is the absolute value of a value measured by the sweep measurement section during execution of the second control.

Control apparatus

An engine control device is provided, which includes a blowby gas passage connecting an engine body to an intake passage so that blowby gas leaked from a combustion chamber is recirculated to the intake passage, a boost pressure changer configured to change a boost pressure of a turbocharger, and a controller configured to set a target boost pressure and control the boost pressure changer. The turbocharger includes a turbine which is provided to an exhaust passage and driven by exhaust gas, and a compressor which is provided to the intake passage and rotary driven by the turbine to boost intake air. The blowby gas passage is connected to the intake passage near the compressor. The controller corrects the target boost pressure when an ambient temperature is below a given determination temperature, to be higher than the target boost pressure when the ambient temperature is at or above the determination temperature.

Engine control device

A control device for an engineincluding cylinders, and configured to perform a reduced-cylinder operation by idling some of cylinders. The control device includes a hydraulic valve-stopping mechanismwhich closes the intake and exhaust valvesof the cylinders in response to establishment of the reduced-cylinder operation execution condition, a hydraulic variable valve timing mechanismcapable of changing a phase of the exhaust valveof the engine, and an ECUwhich controls the valve-stopping mechanismand the hydraulic variable valve timing mechanism. In response to establishment of the reduced-cylinder operation execution condition, the ECUallows the hydraulic variable valve timing mechanismto execute the phase change to the exhaust valve, and subsequently allows the valve-stopping mechanismto bring the intake and exhaust valvesof the cylinders into closed state.

Control device for engine

When an engine rotation speed is lower than a reference rotation speed, first failure determination in which failure of a flow rate control valve is determined based on a pressure change of cooling water detected by a pressure sensor is executed, when a valve closing instruction to switch the flow rate control valve from an opened state to a closed state is output from a valve control device; and when an engine rotation speed is equal to or higher than the reference rotation speed, second failure determination in which failure of the flow rate control valve is determined based on a pressure change of cooling water detected by a pressure sensor is executed, when a valve opening instruction to switch the flow rate control valve from a closed state to an opened state is output from the valve control device.

Cooling device for engine, and failure determination method thereof

An estimation unit estimates a fuel pressure on a discharge side of a high-pressure pump based on an amount of fuel injection with a fuel injection valve from a time point at which a detected fuel pressure changes from a higher status than a first pressure to a lower status, assuming that the fuel has not been discharged with the high-pressure pump. The determination unit determines that a relief valve is in an open status based on a dropping mode of the estimated fuel pressure and a dropping mode of the detected fuel pressure.

Relief valve determination device for high-pressure fuel supply system

Provided is an engine cooling apparatus capable of preventing deterioration in reliability of a cylinder head of an engine during cold engine operation. The engine cooling apparatus comprises an engine cooling water path, a heater core cooling path, and a radiator cooling water path, and further comprises a switching valve for switching among these cooling water paths. The switching valve is operable, when the temperature of an area around an exhaust valve is raised to a value greater than, e.g., 150&#xb0; C., even in a situation where the temperature of cooling water for cooling the engine is equal to or less than, e.g., 50&#xb0; C., to switch from the in-engine cooling water path to the heater core cooling water path.

Engine cooling apparatus

A control device for an engine includes a valve-stopping mechanismwhich holds intake and exhaust valvesof the first and the fourth cylinders (idle cylinders) of four cylinders in closed states, a throttle valve control unit, an ignition period control unit, and an ECUwhich controls the valve-stopping mechanism, the throttle valve control unit, and the ignition period control unit. The ECUsets a retard amount of the ignition period of the idle cylinder behind the basic ignition period at least in starting the all-cylinder operation in accordance with an amount of burned gas existing in the idle cylinder in switching to the all-cylinder operation from the reduced-cylinder operation.

A controller increases an actual oil pressure up to a transient oil pressure (an actuating oil pressure) and then supplies oil adjusted to have the transient oil pressure (the actuating oil pressure) to valve stopping mechanisms to actuate the valve stopping mechanisms. The controller, when actuating the valve stopping mechanisms, starts increase in an intake filling amount when the actual oil pressure increases up to a predetermined determination value set at the transient oil pressure (the actuating oil pressure) or lower.

Device and method for controlling engine

In a predetermined operating region, a fuel injection valve executes a second injection to inject fuel into a cylinder in a compression stroke, and a first injection to inject fuel into the cylinderin the compression stroke or an intake stroke before the second injection. When a purge is executed, the total quantity of fuel to be injected by the fuel injection valve into the cylinder is reduced more than when the purge is not executed, and a fuel reduction quantity of the second injection is made smaller than a fuel reduction quantity of the first injection.

Fuel control device for engine

An exhaust passageincludes: a first passage (high-speed passages, and); and a second passage (low-speed passages, and). A turbine housingis connected to the exhaust passagedownstream from the collector. An exhaust deviceof an engineincludes a valve (an exhaust variable valve) to open and close the first passage. A controller (an engine controller) closes the valve if an engine speed of the engineis lower than a predetermined engine speed and opens the valve if the engine speed of the engineis higher than or equal to the predetermined engine speed. The controller opens the valve even though the engine speed of the engineis lower than the predetermined engine speed if performing the fuel cut control.

Engine exhaust device

A required opening correction amount is calculated based on a target supercharging pressure and an actual supercharging pressure, a target opening is calculated based on a required opening and the required opening correction amount, an actual operating position of a wastegate valve is determined to correspond to a fully closed position when the wastegate valve is in a fully closed condition, an actual opening of the wastegate valve is calculated based on the fully closed position and the actual operating position, an operation amount of an actuator for aligning the target opening with the actual opening is calculated based on the target opening and the actual opening, and when the target opening corresponds to the fully closed condition and the actual operating position is not decreased at or above a prescribed rate, the fully closed position is updated to the actual operating position.

Control apparatus and control method for internal combustion engine

To improve the controllability of the feedback control of the boost pressure, an ECU comprises a valve control part that feedback controls a boost pressure of a turbocharger based on a deviation between a target boost pressure and an actual boost pressure, and a determination part that determines whether or not the exhaust state in an exhaust passage can achieve the target boost pressure, and the feedback control includes at least an integral term, and when the determination part determines the exhaust state cannot achieve the target boost pressure, the valve control part reduces the influence of the deviation on the calculation of integral term compared with that when the exhaust state can achieve the target boost pressure.

Control device of an engine

When it is detected that an exhaust cut valve is stuck in a closed state, a control device stops feedback control and maintains a wastegate valve in a completely open state in each of an open operation range and a closed operation range. When it is detected that the exhaust cut valve is stuck in an open state, the control device stops the feedback control and maintains the wastegate valve in the completely open state in the closed operation range, whereas the control device performs the feedback control in the open operation range.

Control device of turbocharged engine

A control method of a turbocharged engine includes: a bypass passage bypassing a compressor; and a bypass valve configured to open and close the bypass passage. The method includes: a compressor flow rate predicting step of predicting a flow rate of air flowing through the compressor after a predetermined time; a compressor pressure ratio detecting step of detecting a pressure ratio of the compressor; a surging determining step of determining whether or not surging occurs after the predetermined time, in reference to preliminary prepared surging determination data based on the compressor predicted flow rate and the compressor pressure ratio; and a bypass valve controlling step of opening the bypass valve when it is determined in the surging determining step that the surging occurs and closing the bypass valve when it is determined in the surging determining step that the surging does not occur.

Method of controlling turbocharged engine and control device of turbocharged engine

A control apparatus of an engine including intake and exhaust valves and a variable valve timing mechanism for varying open and close timings is provided. The apparatus includes a processor configured to execute an increasing amount controlling module for performing a fuel amount increase control in which a fuel injection amount is increased to decrease an exhaust gas temperature, and a valve controlling module for controlling, via the variable valve timing mechanism, an overlapping period in which the intake and exhaust valves are both opened on intake stroke. When the increasing amount controlling module performs the increase control, based on an increase of a temperature of the exhaust gas in the increase control, the valve controlling module determines whether a protection for an exhaust system component is required, and if the protection is determined to be required, the valve controlling module shortens the overlapping period.

Growing community of inventors

Otake, Japan

Takafumi Nishio