Interrelated power delivery controls – including engine control – Transmission control – Engine controlled by transmission
Reexamination Certificate
2000-02-02
2001-05-15
Wright, Dirk (Department: 3681)
Interrelated power delivery controls, including engine control
Transmission control
Engine controlled by transmission
Reexamination Certificate
active
06231478
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and a system for controlling idle revolution number of an engine depending on a state of a driving load of an automatic transmission.
2. Description of the Prior Art
As to a conventional system for controlling engine revolution number, an idle revolution number control in due consideration of effects of state of load of an automatic transmission exerted on the engine driving condition is being carried out, as disclosed in the Japanese Publication Patent No. H02-057211, by setting an idle target revolution number using informations such that whether the shift position of the automatic transmission is in nonrunning range or in running range upon carrying out detection of position of shift lever of the automatic transmission.
Now, the hydraulic automatic transmission carries out the speed change control by controlling the oil pressure within the automatic transmission, and then, if delivery power of an oil pump happens to change due to change of engine revolution number and oil temperature and the like, time required for speed change too changes. In the case where the delivery power of the oil pump is lowered that is seen, for example, when the engine revolution number is low due to an extremely high temperature or an extremely low temperature, the time required for speed change operation becomes long and therefore, there was a problem to produce a time delay until completion of actual speed change from the time when the shift position of the automatic transmission is changed.
This is to say that because, in the conventional idle revolution number control system, judgement of whether the driving load exists or not is made based on whether the shift lever position is in running range or nonrunning range, that system can not cope with the time discrepancy between the timing of shift lever position change from being changed to the nonrunning range to the running range and that of actual clutch cloupling of the automatic transmission, and thus there was a case where a spouting up of the engine revolution number was induced.
As a measure against this situation, for example according to Japanese Laid-Open Patent Application No. H05-280400, an arrangement is made such that the idle target revolution number is changed with a delay by a predetermined time, which is decided depending on oil temperature of an automatic transmission, from the time when the shift position is changed from nonrunning range to running range.
However, even if an arrangement is made such that the idle revolution number is maintained to the target idle revolution number of nonrunning range within a predetermined time, which is decided depending on the oil temperature of the automatic transmission, from the time when the shift position is changed from the nonrunning range to the running range as disclosed by the prior art as given above, due to the fact that the control factor is the oil temperature only, there was a problem such that any countermeasure could not be devised when delivery power changes were to be caused by factors other than the oil temperature.
The present invention has been made to solve the foregoing problems and provides method and system of an idle revolution number control system being capable of preventing a spouting up of engine revolution number caused by unmatched condition between the shift position change of the automatic transmission and the change of actual condition of driving load.
SUMMARY OF THE INVENTION
The method of controlling idle revolution number of an engine according to claim
1
characterized in that when a shift position of an automatic transmission is changed from a nonrunning range to running range, a starting timing of a clutch coupling of an automatic transmission is detected and, when the clutch coupling starting is detected, quantity of bypass air flowing through a bypass passage of a throttle valve being provided in an air intake passage for supplying air to the engine is controlled so as to control the idle revolution number.
The control system of idle revolution number of an engine according to claim
2
comprises a means for detecting a starting timing of a clutch coupling of said automatic transmission when the shift position is changed from a nonrunning range to a running range, a means for setting a bypass air compensation quantity at the timing when the starting timing of the clutch coupling is detected depending on a driving load condition during the running range positioned and carrying out compensation of the bypass air quantity by the bypass air compensation quantity and also carrying out control of the intake air control valve depending on the compensated bypass air quantity.
The control system of idle revolution number for an engine according to claim
3
comprises a means for detecting a starting timing of a clutch coupling of the automatic transmission when the shift position is changed from a nonrunning range to a running range, a means for setting a first target revolution number when the shift position is in the nonrunning range and maintaining the engine revolution number to the first target idle revolution number and a means for setting a second target idle revolution number when the shift position is in the running range and for controlling the idle revolution number so as to, when the shift position is changed from the nonrunning range to the running range, maintain the engine revolution number to the first target idle revolution number until the starting timing of the clutch coupling is detected and maintain the engine revolution number to the second target idle revolution number from the time when the starting timing of the clutch coupling is detected.
The control system of idle revolution number of an engine according to claim
4
is constituted by incorporating, into the control system according to claim
2
, a means for detecting engine revolution number, a means for setting a first target revolution number when the shift position is in the nonrunning range and maintaining the engine revolution number to the first target idle revolution number and a means for setting a second target idle revolution number when the shift position is in the running range and for controlling the idle revolution number so as to, when the shift position is changed from the nonrunning range to the running range, maintain the engine revolution number to the first target idle revolution number until the starting timing of the clutch coupling is detected and maintain the engine revolution number to the second target idle revolution number from the time when the starting timing of the clutch coupling is detected.
The control system of idle revolution number of an engine according to claim
5
comprises a means for detecting cooling water temperature and the control system is constructed so that a compensation quantity of the bypass air is set at the time when the shift position of the automatic transmission is in running range depending on the detected cooling water temperature.
The control system of idle revolution number of an engine according to claim
6
, comprises a means for detecting engine revolution number, a means for detecting oil temperature of the automatic transmission, a means for controlling oil pressure within the automatic transmission depending on the engine revolution number and the detected oil temperature and a means for controlling timing of the clutch coupling of the automatic transmission by means of the oil pressure control.
REFERENCES:
patent: 5048372 (1991-09-01), Sodeno et al.
patent: 5050453 (1991-09-01), Yamaguchi
patent: 5794262 (1998-08-01), Robinson
patent: 5833572 (1998-11-01), Leising et al.
patent: 6106432 (2000-08-01), Nishida
patent: H5-280400 (1993-10-01), None
Mitsubishi Denki & Kabushiki Kaisha
Sughrue Mion Zinn Macpeak & Seas, PLLC
Wright Dirk
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