Toyota Jidosha Kabushiki Kaisha

Yuki Haba

Kohei Yoshida

Yusuke Nozaki

Yuki Bisaiji

Naoya Okamoto

Nobumoto Ohashi

Yoshio Yamashita

Taro Aoyama

Teruhiko Miyake

Naoki Takeuchi

Hajime Takagawa

Yoshito Nogi

Koki Uno

Masashi Shinoda

Koji Nakayama

In an internal combustion engine, an exhaust purification catalyst and a hydrocarbon feed valve are arranged in an exhaust passage. When a temperature of the exhaust purification catalyst falls in a first catalyst temperature region (I), a first NOpurification method is performed, while when a temperature of the exhaust purification catalyst falls in a second catalyst temperature region (II), a second NOpurification method is performed. When the temperature of the exhaust purification catalyst falls in a region (IIP) in the second catalyst temperature region close to the first catalyst temperature region, the temperature of the exhaust purification catalyst is made to increase to shift the region in which the temperature of the exhaust purification catalyst falls to the first catalyst temperature region to thereby switch the NOpurification method used from the second NOpurification method to the first NOpurification method.

Exhaust purification device for internal combustion engine

In an internal combustion engine, a hydrocarbon feed valve () and an exhaust purification catalyst () are arranged in an engine exhaust passage. When releasing the stored NOfrom the exhaust purification catalyst (), usually combustion gas of a rich air-fuel ratio is generated in the combustion chamber () to make the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst () rich. When releasing the stored NOfrom the exhaust purification catalyst () in case where the temperature of the exhaust purification catalyst () is low, the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst () is made rich by injecting hydrocarbons from the hydrocarbon feed valve ().

Exhaust purification system of internal combustion engine

In an internal combustion engine, a hydrocarbon feed valve and an exhaust purification catalyst are arranged in an engine exhaust passage. A first NOremoval method which reduces NOcontained in an exhaust gas by a reducing intermediate which is generated by injecting hydrocarbons from the hydrocarbon feed valve within a predetermined range of period and a second NOremoval method in which an air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst is made rich by a period which is longer than this predetermined range are used. The switching temperatures ST and STof the exhaust purification catalyst at which temperature an NOremoval method is switched from the second NOremoval method to the first NOremoval method, are made lower if the amount of NOin the exhaust gas flowing into the exhaust purification catalyst increases.

Exhaust purification system for an internal combustion engine

In an internal combustion engine, a hydrocarbon feed valve and an exhaust purification catalyst are arranged in an engine exhaust passage. A first NOX removal method which injects hydrocarbons from the hydrocarbon feed valve within a predetermined range of period so that the reducing intermediate generated thereby reduces the NOX contained in the exhaust gas and a second NOX removal method which makes the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst a first target rich air-fuel ratio by a period which is longer than this predetermined range are used. When the NOX removal method is switched from the second NOX removal method to the first NOX removal method, the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst is made a second target air-fuel ratio which is smaller than the first target rich air-fuel ratio.

The influenced of condensed water on an EGR device is alleviated. A device () that controls a cooling system including adjusting means for being able to adjust a circulation amount of coolant in a first flow passage, including an engine cooling flow passage, an EGR cooling flow passage and a radiator flow passage, and a second flow passage, including the engine cooling flow passage, the EGR cooling flow passage and a bypass flow passage and not including the radiator flow passage, includes: measuring means for measuring a temperature of the coolant; limiting means for limiting circulation of the coolant at starting an internal combustion engine; and control means for circulating the coolant preferentially through the second flow passage via control over the adjusting means based on the measured temperature in a period in which circulation of the coolant is limited.

Control device for cooling system

A hydrocarbon feed valve and an exhaust purification catalyst are arranged in an engine exhaust passage. A first NOpurification method which injects hydrocarbons from the hydrocarbon feed valve by a predetermined period to thereby remove NOwhich is contained in the exhaust gas and a second NOpurification method which makes the air-fuel ratio of the exhaust gas which flows into the exhaust purification catalyst rich to make the exhaust purification catalyst release the stored NOwhen the NOwhich is stored in the exhaust purification catalyst exceeds a first allowable value are selectively used. Hydrocarbons are injected from the hydrocarbon feed valve by the predetermined period, and when the NOwhich is stored in the exhaust purification catalyst exceeds a second allowable value which is smaller than the first allowable value, the air-fuel ratio of the exhaust gas which flows into the exhaust purification catalyst is made rich.

A tubular outer needle, slidably housed in a body, can communicate nozzle and suck chambers R, Rwith each other and shut them from each other, and defines nozzle and suck chambers R, R. A rod-like inner needle, coaxially slidably housed in the outer needle, has a tip end portion movable into the suck chamber Rat its lowermost position. In the range of small inner lift amount, an annular clearance is formed between an inner peripheral surface of an inner side wall defines the suck chamber Rand an outer peripheral surface of an outer side wall of the needle tip end portion. Outer and inner lift amounts are regulated such that when fuel injection is started, the outer and inner lift amounts simultaneously increase from zero while when fuel injection is terminated, the inner lift amount returns to zero after the outer lift amount returns zero.

Growing community of inventors

Mishima, Japan

Yuki Haba