Mazda Motor Corporation

Mazda Motor Corporat Ion

Takahiro Yamamoto

Naoki Yamamoto

Daisuke Shimo

Naotoshi Shirahashi

Takeshi Matsubara

Tsunehiro Mori

Takafumi Nishio

Toshiaki Nishimoto

Sangkyu Kim

Masanori Hashimoto

Yoshie Kakuda

Motoshi Kataoka

Kiyoaki Iwata

Nobuhiko Yokoyama

Yoshiaki Nakaya

Kiyonori Nagato

Takeshi Inazumi

Takaya Okugawa

Kuniaki Wada

Toshiaki Wakabayashi

Keisuke Kawahara

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

A rear light is a light disposed in a rear portion of a vehicle, and includes: a light source; a light-transmitting plate that guides incident light from the light source; and a dot portion that is disposed on the light-transmitting plate and reflects incident light to the outside of the vehicle with different reflection intensities depending on positions on the light-transmitting plate.

Vehicle light

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

The compression self-ignition engine fuel injection control device is configured to, during one combustion stroke, perform multiple fuel injections to induce multiple combustions in a cylinder. The fuel injection control device comprises a PCM () configured to set an interval between temporally-adjacent two of the multiple fuel injections, so as to allow valley regions of a curve indicative of a frequency characteristic of a combustion pressure wave generated by the multiple combustions to fall within respective ranges of a plurality of resonant frequency bands of a structure of an engine body of the engine, wherein the PCM is operable to increase the interval between the temporally-adjacent multiple fuel injections to 1.7&#xb1;0.1 msec.

Fuel injectin control method and fuel injection control device for compression self-ignition engine

The compression self-ignition engine fuel injection control device is configured to, during one combustion stroke, perform multiple fuel injections to induce multiple combustions in a cylinder. The fuel injection control device comprises a PCM () configured to set an interval between a pre-injection and a main injection in the multiple fuel injections, so as to allow valley regions of a curve indicative of a frequency characteristic of a combustion pressure wave generated by the multiple combustions to fall within respective ranges of a plurality of resonant frequency bands of a structure of an engine body of the engine, wherein the PCM is operable to increase a fuel injection amount of the pre-injection more largely as an engine load becomes lower at the same engine speed.

Fuel injection control method and fuel injection control device for compression self-ignition engine

A fuel injection control apparatus for an engine in which fuel is injected into a cylinder a plurality of times to cause a plurality of combustions is provided, which includes a controller for controlling a time interval of performing the plurality of fuel injections so that a waveform indicating a frequency characteristic of a combustion pressure wave that is produced by each of the plurality of combustions has valley points at frequencies within a plurality of resonant frequency bands of a structural system of the engine, respectively.

Fuel injection control apparatus for engine

The compression self-ignition engine fuel injection control device is configured to, during one combustion stroke, perform multiple fuel injections to induce multiple combustions in a cylinder. The fuel injection control device comprises a PCM () configured to set an interval between a pre-injection and a main injection in the multiple fuel injections, so as to allow valley regions of a curve indicative of a frequency characteristic of a combustion pressure wave generated by the multiple combustions to fall within respective ranges of a plurality of resonant frequency bands of a structure of an engine body of the engine, wherein the PCM is operable to increase the interval between the pre-injection and the main injection more largely as an engine load becomes lower at a same engine speed.

Growing community of inventors

Hiroshima, Japan

Takahiro Yamamoto