公开(公告)号：JP2002004902A

公开(公告)日：2002-01-09

申请号：JP2000187545

申请日：2000-06-19

Applicant: TOYOTA MOTOR CORP

Inventor： SASAKI SHIZUO ,  YOSHIZAKI KOJI ,  GOTO MASAHITO ,  ITO TAKEKAZU

IPC: F02M25/07 ,  F01N3/20 ,  F01N3/24 ,  F02D9/02 ,  F02D21/08 ,  F02D41/00 ,  F02D41/02 ,  F02D41/06 ,  F02D41/38 ,  F02D43/00

Abstract: PROBLEM TO BE SOLVED: To complete the warming-up of a catalyst earlier while suppressing the passage of hydrocarbon through the exhaust gas cleaning catalyst for early change from second combustion into first combustion. SOLUTION: The second combustion is performed at starting an engine where the amount of an EGR gas to be supplied into a combustion chamber 5 is less than the amount of an EGR gas in conjunction with the generation amount of soot to be at a peak (t0-t2), and then the first combustion is performed where the amount of the EGR gas to be supplied into the combustion chamber 5 is more than the amount of the EGR gas in conjunction with the generation amount of the soot to be at the peak (t2 or later). During the second combustion at starting the engine, combustion is executed where the temperature of an exhaust gas from the combustion chamber 5 is relatively high without increasing hydrocarbon in the exhaust gas to make a EGR ratio zero for suppressing the amount of hydrocarbon to be supplied to exhaust gas cleaning catalysts 22, 26a (t0-t1), and then combustion is executed where hydrocarbon in the exhaust gas is increased and the temperature of the exhaust gas from the combustion chamber 5 is relatively high to make the EGR ratio gradually increase for increasing the amount of hydrocarbon to be supplied to the catalysts 22, 26a.

公开(公告)号：JP2000145512A

公开(公告)日：2000-05-26

申请号：JP31635298

申请日：1998-11-06

Applicant: TOYOTA MOTOR CORP

Inventor： SASAKI SHIZUO ,  GOTO MASAHITO ,  ITO TAKEKAZU ,  YOSHIZAKI KOJI ,  MURATA HIROKI

IPC: F02M25/07 ,  F01N3/08 ,  F01N3/24 ,  F02D41/12

Abstract: PROBLEM TO BE SOLVED: To simultaneously prevent discharging soot, NOx, and unburned hydrocarbon, to save fuel at the time of deceleration driving, and to avoid the decreasing of catalyst temperature. SOLUTION: This internal combustion engine simultaneously prevents discharging soot and NOx by executing low-temperature combustion wherein an EGR gas amount supplied into a combustion chamber 5 is more than the EGR gas amount at a peak of generation amount of soot, and wherein soot is hardly generated. And the internal combustion engine prevents discharging unburned hydrocarbon therefrom by oxidizing the unburned hydrocarbon discharged from the combustion chamber 5 with a catalyst 25. At the time of deceleration driving, fuel cutting is executed to save fuel. Furthermore, by executing the fuel cutting at deceleration driving and opening a throttle valve 20, decreasing temperature of the catalyst 25 owing to air passing through the combustion chamber 5 without contributing to combustion is prevented, so that reduction in oxidizing performance of the catalyst 25 with decreasing of the catalyst temperature is prevented.

公开(公告)号：JP2000135939A

公开(公告)日：2000-05-16

申请号：JP31088198

申请日：1998-10-30

Applicant: TOYOTA MOTOR CORP

Inventor： GOTO MASAHITO ,  SASAKI SHIZUO ,  ITO TAKEKAZU

IPC: B60W10/04 ,  B60T13/52 ,  B60T17/00 ,  B60W10/06 ,  B60W10/18 ,  B60W10/184 ,  F01N3/08 ,  F01N3/24 ,  F02D9/02 ,  F02D21/08 ,  F02D41/02 ,  F02D41/04 ,  F02D43/00 ,  F02M25/07 ,  B60K41/20

Abstract: PROBLEM TO BE SOLVED: To use negative pressure generated in an intake passage, as a negative pressure source of a brake booster. SOLUTION: This internal combustion engine selectively performs first combustion hardly generating soot since the EGR gas quantity in a combustion chamber 5 is larger than the EGR gas quantity with the generated quantity of soot reaching its peak, and second combustion in which the EGR gas quantity in the combustion chamber 5 is smaller than the EGR gas quantity with the generated quantity of soot reaching its peak. Negative pressure generated in an air suction pipe 17 downstream of a throttle valve 20 is led into a brake booster 60.

公开(公告)号：JP2000130268A

公开(公告)日：2000-05-09

申请号：JP29991798

申请日：1998-10-21

Applicant: TOYOTA MOTOR CORP

Inventor： ITO TAKEKAZU ,  SASAKI SHIZUO ,  YOSHIZAKI KOJI ,  GOTO MASAHITO ,  MURATA HIROKI

IPC: F02M25/07 ,  F01N3/08 ,  F01N3/24 ,  F02D21/08 ,  F02D41/02 ,  F02D41/14 ,  F02D43/00

Abstract: PROBLEM TO BE SOLVED: To restrain smoke from generating in switching to first combustion and second combustion, and vice versa. SOLUTION: First combustion where the EGR gas amount in a combustion chamber 5 is more than the EGR gas amount with the peak generation of soot and thus generates little soot and second combustion where the EGR gas amount in the combustion chamber 5 is less than the EGR gas amount with the peak generation of soot are selectively performed. Switching from the first combustion to the second combustion is performed from the cylinder having the highest air-fuel ratio in the combustion chamber 5, and switching from the second combustion to the first combustion is performed from the cylinder having the lowest air-fuel ratio in the combustion chamber 5.

公开(公告)号：JP2000130267A

公开(公告)日：2000-05-09

申请号：JP31082498

申请日：1998-10-30

Applicant: TOYOTA MOTOR CORP

Inventor： MURATA HIROKI ,  SASAKI SHIZUO ,  YOSHIZAKI KOJI ,  GOTO MASAHITO ,  ITO TAKEKAZU

IPC: F02M25/07 ,  F01N3/00 ,  F01N3/02 ,  F01N3/08 ,  F01N3/24 ,  F02D21/08 ,  F02D41/02 ,  F02D41/14 ,  F02D43/00

Abstract: PROBLEM TO BE SOLVED: To solve a problem such as generation of misfire by executing combustion wherein a rate of inert gas supplied in a combustion chamber is much more than a rate of inert gas in which a soot generating rate peaks and the soot is hardly generated, and inhibiting combustion wherein the soot is hardly generated when a period rotating speed is not less than prescribed rotating speed. SOLUTION: In a diesel engine 1, a part of exhaust gas is returned to an intake side for recirculation through an EGR passage 29 in order to suppressing the generation of NOx, a combustion temperature falls down in a combustion chamber with increase in an EGR gas rate, and a generating rate of NOx is reduced in association with reduction of the temperature. When an EGR rate exceeds some limit, a rate of smoke is rapidly increased. The EGR gas rate is further increased after the rate of smoke exceeds a peak level a condition becomes an operating condition in which soot is hardly generated. When period rotating speed exceeds not less than prescribed rotating speed during performing a combustion operation in a low temperature, the combustion operation is inhibited. It is thus possible to solve such a failure that a combustion condition is deteriorated and misfire is generated.

公开(公告)号：JP2000120487A

公开(公告)日：2000-04-25

申请号：JP29403498

申请日：1998-10-15

Applicant: TOYOTA MOTOR CORP

Inventor： SASAKI SHIZUO ,  ITO TAKEKAZU ,  ABE TSUKASA ,  GOTO MASAHITO ,  YOSHIZAKI KOJI ,  MURATA HIROKI

IPC: F02M25/07 ,  F01N3/08 ,  F01N3/24 ,  F02D41/04 ,  F02D41/40 ,  F02D45/00

Abstract: PROBLEM TO BE SOLVED: To secure excellent combustion at low temperature at all times by determining whether or not smoke or noise higher than a definite level is generated, or combustion is incomplete. SOLUTION: A first combustion in which the amount of EGR gas within a combustion chamber 5 is greater than the amount of EGR gas where the amount of soot generation is at its peak, and soot is scarcely produced, and a second combustion in which the amount of EGR gas within the combustion chamber 5 is less than the amount of EGR gas where the amount of soot generation is at its peak, are selectively performed. It is determined based on combustion pressure detected by a combustion pressure sensor 37 whether smoke or noise higher than a definite level is generated, or combustion is incomplete, and when it is determined that smoke or noise higher than a definite level is generated, fuel injection timing is delayed or an air-fuel ratio is made lean, and when it is determined that combustion is incomplete, fuel injection timing is advanced, or an air-fuel ratio is made rich.

公开(公告)号：JP2000110669A

公开(公告)日：2000-04-18

申请号：JP28558598

申请日：1998-10-07

Applicant: TOYOTA MOTOR CORP

Inventor： GOTO MASAHITO ,  SASAKI SHIZUO ,  YOSHIZAKI KOJI ,  ITO TAKEKAZU ,  MURATA HIROKI

IPC: F02M25/07 ,  F01N3/24 ,  F02D21/08 ,  F02D41/02 ,  F02D41/30 ,  F02D45/00

Abstract: PROBLEM TO BE SOLVED: To lessen the opportunity for increasing the amount of soot following change-over between combustion at low temperature and second combustion while suppressing the generation of soot and NOx. SOLUTION: The change-over of an engine can be selectively made between combustion at low temperature in which scarcely no soot is generated because the amount of EGR gas (exhaust gas recalculation) to be fed to the inside of a combustion chamber 5, is much more than the amount of EGR gas where the generation of soot is at its peak, and second combustion in which the amount of EGR gas to be fed, is much less than the amount of EGR gas where the generation of soot is at its peak. When it is forecasted based on the frequency of change in loading obtained by a loading sensor 51 and a crank angle sensor 52, information on roads to go by, which is obtained by a navigation system 60 and the like, that the engine is in an operating condition high in the frequency of change-over between combustion at low temperature and second combustion, the execution of combustion at low temperature is prohibited, or the contraction of an operating area for performing combustion at low temperature recluses the frequency of change-over between combustion at low temperature and second combustion.

公开(公告)号：JP2000110633A

公开(公告)日：2000-04-18

申请号：JP28412398

申请日：1998-10-06

Applicant: TOYOTA MOTOR CORP

Inventor： SASAKI SHIZUO ,  ABE TSUKASA ,  GOTO MASAHITO ,  ITO TAKEKAZU ,  YOSHIZAKI KOJI ,  MURATA HIROKI

IPC: F02M25/07 ,  F01N3/24 ,  F02D9/02 ,  F02D21/08 ,  F02D41/02 ,  F02D41/04 ,  F02D41/14 ,  F02D41/18 ,  F02D45/00

Abstract: PROBLEM TO BE SOLVED: To ensure low temperature combustion over a long period. SOLUTION: First combustion, that is, low temperature combustion, in which a volume of exhaust gas recirculation(EGR) gas in a combustion chamber 5, is larger than that with which the quantity of generated soot becomes peak so as to produce substantially no soot, and second combustion in which a volume of EGR gas in a combustion chamber 5, is smaller than that with which the quantity of generated soot becomes peak, are selectively carried out. A throttle valve 25 and an EGR control valve 29 are controlled so as to have desired opening degrees in accordance with an operating condition of an engine. Then, the opening degrees of the throttle valve 29 and the EGR control valve 25 are compensated so as to obtain an intake air volume and an EGR gas volume which are regular.

公开(公告)号：JP2000087806A

公开(公告)日：2000-03-28

申请号：JP26036598

申请日：1998-09-14

Applicant: TOYOTA MOTOR CORP

Inventor： GOTO MASAHITO ,  SASAKI SHIZUO ,  YOSHIZAKI KOJI ,  ITO TAKEKAZU ,  MURATA HIROKI ,  ABE TSUKASA

IPC: F02M25/07 ,  F01N3/08 ,  F01N3/24 ,  F02D21/08 ,  F02D41/02 ,  F02D41/04 ,  F02D41/14 ,  F02D41/16 ,  F02D45/00

Abstract: PROBLEM TO BE SOLVED: To correctly match an EGR(Exhaust Gas Recirculation) rate with a desired EGR rate. SOLUTION: A first combustion that an EGR gas amount in a combustion chamber 5 is larger than an EGR gas amount that a soot generation amount is peaked and soot is hardly generated and a second combustion that the EGR gas amount in the combustion chamber 5 is smaller than the EGR gas amount that the soot generation amount is peaked, are selectively performed. When the first combustion is performed, the downstream pressure of a throttle valve 20 is controlled to a desired pressure that an EGR rate is set to a desired EGR rate.

公开(公告)号：JP2000038944A

公开(公告)日：2000-02-08

申请号：JP20504698

申请日：1998-07-21

Applicant: TOYOTA MOTOR CORP

Inventor： GOTO MASAHITO ,  SASAKI SHIZUO ,  YOSHIZAKI KOJI ,  ITO TAKEKAZU ,  MURATA HIROKI

IPC: F02M25/07 ,  F02D21/08 ,  F02D41/02 ,  F02D41/04 ,  F02D41/40 ,  F02D43/00

Abstract: PROBLEM TO BE SOLVED: To realize fuel injection control suited to each combustion by freely switching primary combustion wherein there is an inert gas rate in a combustion chamber more than an inert gas rate in which a soot generating rate peaks, and secondry combustion wherein the inert gas rate is few in the combustion chamber, and forming a map of a fuel injection time suited to each combustion, SOLUTION: It is judged whether a flag showing that an operating condition of an engine is in a first operating region is set or not. In the case where the flag is set, it is judged whether a command load L is larger than a first boundary X1 or not. When the judgment is L Xi, secondary combustion is carried out, and target openings of the throttle valve 20 and the EG control valve 31 are calculated from a corresponding map.