Title:
【発明の名称】車両の触媒温度検出装置
Document Type and Number:
Japanese Patent JP2860866
Kind Code:
B2
Abstract:
PCT No. PCT/JP94/01827 Sec. 371 Date Jun. 7, 1995 Sec. 102(e) Date Jun. 7, 1995 PCT Filed Oct. 28, 1994 PCT Pub. No. WO95/12752 PCT Pub. Date Jun. 11, 1995Apparatus and method for estimating the temperature of a catalytic converter for automotive engine can be estimated simply and accurately. Specifically, the cooling water temperature Tws at start-up is presumed to correspond to the ambient temperature, and a lost heat amount Tm is estimated based on the cooling water temperature Tws at start-up, and on the vehicle speed VSP. Then, a time integral value STm of the lost heat amount Tm is computed. On the other hand, the engine intake air quantity Q is presumed to correspond to an exhaust quantity, and a received heat amount Tp, which the catalytic converter absorbs from the exhaust, is estimated based on the intake air quantity Q. Then, a time integral value STp of the absorbed heat amount Tp is computed. The time integral value STm is then subtracted from the time integral value STp to obtain a heat amount X retained in the catalytic converter. The heat amount X is then compared with a predetermined value to estimate if the catalytic converter has reached an activation temperature.
Inventors:
TOMIZAWA NAOMI
Application Number:
JP27423393A
Publication Date:
February 24, 1999
Filing Date:
November 02, 1993
Export Citation:
Assignee:
YUNISHIA JETSUKUSU KK
International Classes:
F02B77/08; F01N3/20; F01N3/24; F01N11/00; F02D41/06; F01N9/00; (IPC1-7): F01N3/20; F02B77/08
Domestic Patent References:
| JP5272394A | ||||
| JP5195759A | ||||
| JP2305309A | ||||
| JP783039A |
Attorney, Agent or Firm:
Fumio Sasashima