Injector controlling method using opening duration

Patent metadata

Field	Value
Publication number	US-9932926-B2
Application number	US-201615368301-A
Country	US
Kind code	B2
Filing date	Dec 2, 2016
Priority date	Dec 7, 2015
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

Disclosed is an injector controlling method using an opening duration. The injector controlling method using an opening duration converts a target fuel quantity into an opening duration and sets relationship between the opening duration and an injector actuation signal in order to control the fuel quantity of injectors more accurately.

First claim

What is claimed is:

1. An injector controlling method using an opening duration comprising:
a first step of applying actuation signals to a plurality of injectors and securing a time profile of an output voltage;
a second step of evaluating the time profile to determine a closing time of the injectors;
a third step of learning an opening durations of the injectors based on the closing time;
a fourth step of selecting a standard injector out of the injectors; and
a fifth step of determining second actuation signals to be inputted into the remaining injectors except the standard injector based on the learned opening duration of the standard injector.

2. The injector controlling method according to claim 1 , wherein the output voltage in the first step is a self-induced voltage which is created when a current flow is interrupted after the current flow is formed on the injector by the actuation signal.

3. The injector controlling method according to claim 2 , wherein the second step includes the steps of finding an inflection point from the time profile of the self-induced voltage and determining the closing time based on the inflection point.

4. The injector controlling method according to claim 3 , wherein the inflection point is formed while the self-induced voltage is decayed.

5. The injector controlling method according to claim 1 , wherein the second step is to find an inflection point from the time profile of the self-induced voltage by evaluating the time profile and determine the closing time based on the inflection point.

6. The injector controlling method according to claim 1 , wherein the third step includes the steps of:
determining the opening time based on a current peak value of the actuation signal;
determining a time interval between the opening time and the closing time as an opening duration; and
storing the determined opening duration.

7. The injector controlling method according to claim 1 , wherein in the fourth step, the standard injector is selected by comparing the learned opening durations of the plural injectors.

8. The injector controlling method according to claim 1 , wherein when the fuel quantity corresponding to the learned opening durations of the injectors is divided into a maximum value, an intermediate value and a minimum value, the standard injector is selected among the injectors having the intermediate value.

9. The injector controlling method according to claim 1 , wherein the fifth step includes the steps of: matching the learned opening durations of the injector except the standard injector with the learned opening duration of the standard injector, comparing the actuation signal of the standard injector with the actuation signal of the remaining injectors, and determining the actuation signals of the remaining injectors corresponding with the actuation signal of the standard injector relative to the matched opening duration.

10. The injector controlling method according to claim 1 , further comprising:
a sixth step of applying the actuation signal determined in the fifth step to the remaining injectors in order to control fuel quantities of the injectors.

11. The injector controlling method according to claim 10 , wherein in the sixth step, the fuel quantity is determined applying the relationship between the previously mapped opening duration and the fuel quantity.

12. The injector controlling method according to claim 10 , wherein in the sixth step, the fuel quantity is determined applying the relationship between the learned opening duration of the standard injector and the fuel quantity.

13. A fuel quantity controlling method of an engine in which a plurality of injectors having solenoid coils are mounted, comprising the steps of:
applying an actuation signal to the solenoid coil of each injector;
cutting a flow of current flowing through the solenoid coil when the actuation signal is applied, such that the coil is in a currentless state;
detecting a time profile of voltage induced from the coil of the currentless state;
determining a closing time of the injector based on the detected time profile;
determining an opening time of the injector based on the actuation signal, and learning relationship between an opening duration defined by the opening time and the closing time and the actuation signal; and
selecting a standard injector out of the plural injectors, and deciding second actuation signals for the remaining injectors except the standard injector based on relationship between the actuation signal of the standard injector and the opening duration.

14. The fuel quantity controlling method according to claim 13 , wherein the closing time in the closing time determining step is determined based on an inflection point of the time profile.

15. The fuel quantity controlling method according to claim 13 , wherein the opening duration in the opening duration learning step is defined as a time zone between the opening time and the closing time.

16. A control device of an engine which has a plurality of injectors, comprising:
an actuation signal transmitting unit for transmitting actuation signals to the injectors;
an output signal receiving unit for receiving output voltage corresponding to the actuation signals from the injectors; and
a control unit which secures a time profile of the output voltage and evaluates the time profile to determine a closing time of the injectors, learns relationship between an opening duration defined by an opening time and the closing time and the actuation signal, selecting a standard injector out of the plural injectors, and decides second actuation signals for the remaining injectors except the standard injector based on the opening duration of the standard injector.

Assignees

• Hyundai Autron Co Ltd

Inventors

• Kim Yongha
• Kim Youngjae
• Cho Hyunjae

Classifications

• F02D41/0085

  Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio · CPC title

• F02D2041/2058

  using information of the actual current value · CPC title

• F02M51/0664

  having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding · CPC title

• F02D41/2467 Primary

  for injectors · CPC title

• F02M65/005

  Measuring or detecting injection-valve lift, e.g. to determine injection timing · CPC title