Title:
Engine control
Document Type and Number:
Japanese Patent JP6350425
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve the estimation accuracy of purge concentration, and to ensure a supply chance of purge gas.SOLUTION: An ECU 70 is equipped with an air-fuel ratio control portion 71 which feedback controls fuel amount by using a feedback correction value Qfb calculated on the basis of an air-fuel ratio; and a concentration estimating portion 73 which estimates purge concentration. The air-fuel ratio control portion 71 executes air-fuel ratio learning for calculating an air-fuel learning value Qg of the fuel amount on the basis of the feedback correction value Qfb, and feedback controls the fuel amount by using the air-fuel ratio learning value Qg and the feedback correction value Qfb after the air-fuel ratio learning. The concentration estimating portion 73 selectively executes first concentration estimation which estimates purge concentration on the basis of a deviation of the feedback correction values Qfb before/after purging, and second concentration estimation which makes the air-fuel ratio control portion 71 purge after executing the air-fuel ratio learning, and estimates purge concentration on the basis of a deviation between an initial value of the feedback correction value Qfb and the feedback correction value Qfb after the purging.SELECTED DRAWING: Figure 3
Inventors:
High Naoya Ta
Kunihiro Yoshima
Kunihiro Yoshima
Application Number:
JP2015143976A
Publication Date:
July 04, 2018
Filing Date:
July 21, 2015
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
F02M25/08; F02D41/14
Domestic Patent References:
| JP11030159A | ||||
| JP2001152976A |
Attorney, Agent or Firm:
Maeda patent office