Fuel injection controller
First Claim
1. A fuel injection controller comprising:
- a first learning device that has a torque calculating device for calculating an instantaneous torque equivalent as a torque equivalent of an output shaft of an internal combustion engine per unit time by filtering a sensed value of rotation speed of the output shaft and an estimating device for estimating an injection characteristic of an injector of the engine based on the instantaneous torque equivalent; and
a second learning device that has an injecting device for injecting equally-divided injection amounts of a required injection amount of fuel for performing feedback control of conforming the sensed value of the rotation speed of the output shaft to a target value and a learning device for learning the injection characteristic of the injector based on the fuel injection amount as of the feedback control, whereinthe first learning device learns the injection characteristic of the injector in an operation area of the engine other than an operation area where the second learning device performs the learning.
1 Assignment
0 Petitions
Accused Products
Abstract
A fuel injection controller performs minute injection amount learning for learning an injection characteristic of an injector related to a minute amount injection such as a pilot injection by performing n-times of injections of fuel amounts obtained by equally dividing a fuel injection amount required during idle rotation speed control. The controller performs relative injection amount learning for learning a variation in the injection characteristics among cylinders based on a correlation between output torque of an engine and the injection amount when the injections of the equally-divided fuel amounts are not performed. Learning areas of the minute amount injection learning and the relative injection amount learning are defined by the injection amount and fuel pressure such that the learning areas do not interfere with each other.
-
Citations
14 Claims
-
1. A fuel injection controller comprising:
-
a first learning device that has a torque calculating device for calculating an instantaneous torque equivalent as a torque equivalent of an output shaft of an internal combustion engine per unit time by filtering a sensed value of rotation speed of the output shaft and an estimating device for estimating an injection characteristic of an injector of the engine based on the instantaneous torque equivalent; and a second learning device that has an injecting device for injecting equally-divided injection amounts of a required injection amount of fuel for performing feedback control of conforming the sensed value of the rotation speed of the output shaft to a target value and a learning device for learning the injection characteristic of the injector based on the fuel injection amount as of the feedback control, wherein the first learning device learns the injection characteristic of the injector in an operation area of the engine other than an operation area where the second learning device performs the learning. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A fuel injection control method comprising:
-
a first learning step of calculating an instantaneous torque equivalent as a torque equivalent of an output shaft of an internal combustion engine per unit time by filtering a sensed value of rotation speed of the output shaft and of estimating an injection characteristic of an injector of the engine based on the instantaneous torque equivalent; and a second learning step of injecting equally-divided injection amounts of a required injection amount of fuel for performing feedback control of conforming the sensed value of the rotation speed of the output shaft to a target value and of learning the injection characteristic of the injector based on the fuel injection amount as of the feedback control, wherein the first learning step learns the injection characteristic of the injector in an operation area of the engine other than an operation area where the second learning step performs the learning.
-
Specification