Kabushiki Kaisha Toyota Jidoshokki

Masahiro Machida

Hiroshi Kuzuyama

Tsutomu Kawae

Takehito Hamamatsu

A fuel injection device is provided with a fuel injection valve to inject fuel into a combustion chamber of an engine, and an electronic control unit to operate the fuel injection valve to inject the fuel in multiple separate injections. The electronic control unit controls a timing of a first fuel injection by the fuel injection valve to carry out the first fuel injection on the retard side with respect to a timing when a premix duration immediately after the first fuel injection is minimum, and controls a timing of a second fuel injection by the fuel injection valve in such a manner that a heat release rate waveform produced by the first fuel injection and the second fuel injection carried out thereafter has a double-peaked shape.

Fuel injection device

An intake passage () communicating with a combustion chamber () comprises a first branch intake passage () having an intake port () at one end thereof and also having an intake manifold including a surge tank (), a second branch intake passage () having an intake port () at one end thereof and also having an intake manifold including a surge tank (), and a common intake passage () communicating with the ends of the first branch intake passage () and the second branch intake passage (). The common intake passage () is provided with a mixer () for producing a mixture. The intake passage () is provided with a switching valve () for bringing the common intake passage () into communication with at least one of the first branch intake passage () and the second branch intake passage ().

Premixed compression ignition type engine and method of controlling intake air thereof

At high temperature, namely, when the temperature of intake air is higher than a predetermined normal temperature range, an ECU () controls a variable valve timing mechanism () such that the timing for closing an exhaust valve () is adjusted to a retard side, thereby reducing the amount of high-temperature internal EGR gas to avoid the occurrence of pre-ignition. At intermediate load and high load, the ECU () makes the retard amount of the timing for closing the exhaust valve () larger than that at low load, thereby reducing the amount of internal EGR gas. At intermediate load and in an intermediate-revolution range or a high-revolution range, the rotating speed of an electric motor () is increased to raise a supercharging pressure exerted by a supercharger (). At high load and in the high-revolution range, the electric motor () for the supercharger () and an EGR control valve () are controlled such that the supercharging pressure rises and the amount of external EGR gas increases as the temperature of intake air detected by a temperature sensor () rises.

Growing community of inventors

Aichi, Japan

Masahiro Machida