Control method for CVVD apparatus at engine stop

Patent metadata

Field	Value
Publication number	US-11092097-B2
Application number	US-201916531841-A
Country	US
Kind code	B2
Filing date	Aug 5, 2019
Priority date	Mar 18, 2019
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A control method for CVVD apparatus at engine stop, the control method may include receiving, by a controller, vehicle operation information from an information detection portion, determining, by the controller, whether it corresponds to a stop of an engine through the vehicle operation information, determining, by the controller, a predetermined target valve duration of a CVVD apparatus according to a stopping type of the engine in the stop of the engine, controlling, by the controller, the valve duration of the CVVD apparatus according to the predetermined target valve duration determined by the controller, determining, by the controller, if a current RPM of the engine is lower than a predetermined control stop RPM, and stopping the controlling of the valve duration of the CVVD apparatus if the current RPM is lower than the predetermined control stop RPM.

First claim

What is claimed is:

1. A method of controlling a continuous variable valve duration (CVVD) apparatus at engine stop, the method comprising:
receiving, by a controller, vehicle operation information from an information detector;
determining, by the controller, when the vehicle operation information corresponds to a stop of an engine;
determining, by the controller, a predetermined target valve duration of the CVVD apparatus according to the stop of the engine, in a response of determining that the vehicle operation information corresponds to the stop of the engine;
controlling, by the controller, a valve duration of the CVVD apparatus according to the predetermined target valve duration determined by the controller;
determining, by the controller, when a current revolutions per minute (RPM) of the engine is lower than a predetermined control stop RPM; and
stopping the controlling of the valve duration of the CVVD apparatus upon determining that the current RPM is lower than the predetermined control stop RPM,
wherein the predetermined target valve duration is a minimum valve duration to a maximum valve duration of 45% to 55%.

2. The method of claim 1 , further including:
determining, by the controller, when a current valve duration of the CVVD apparatus has reached the predetermined target valve duration upon determining that the current RPM is not lower than the predetermined control stop RPM.

3. The method of claim 2 , further including:
storing, by the controller, the current valve duration of the CVVD apparatus, in a response of determining that the current valve duration of the CVVD apparatus has reached the target valve duration.

4. The method of claim 1 , wherein the predetermined control stop RPM is 100 rpm to 300.

5. The method of claim 1 , wherein the stop of the engine includes an ignition key off, an engine stall stop or a stop by an idle stop.

6. The method of claim 5 , wherein the controller is configured to set an ignition target valve duration as the predetermined target valve duration in the ignition key off.

7. The method of claim 5 , wherein the controller is configured to set an engine stall target valve duration as the predetermined target valve duration of the CVVD in the engine stall stop.

8. The method of claim 5 , wherein the controller is configured to set an idle stop target valve duration as the predetermined target valve duration in the stop by the idle stop.

9. The method of claim 5 ,
wherein the information detector includes an ignition key sensor; and
wherein the ignition key off is determined according to an output signal of the ignition key sensor.

10. The method of claim 5 ,
wherein the information detector includes an RPM sensor; and
wherein the engine stall stop is determined according to an output signal of the RPM sensor.

11. The method of claim 5 ,
wherein the information detector includes an accelerator pedal sensor and a brake pedal sensor; and
wherein the stop by the idle stop is determined according to output signals of the accelerator pedal sensor and the brake pedal sensor.

12. The method of claim 1 ,
wherein the information detector includes an ignition key sensor, an RPM sensor, an accelerator pedal sensor, a brake pedal sensor, and a valve duration sensor, and
wherein the vehicle operation information includes output signals of the ignition key sensor, the RPM sensor, the accelerator pedal sensor, the brake pedal sensor, and the valve duration sensor.

13. A system of controlling a continuous variable valve duration (CVVD) apparatus at engine stop, the system comprising:
an information detector; and
a controller connected to the information detector and configured of:
receiving vehicle operation information from the information detector;
determining when the vehicle operation information corresponds to a stop of an engine;
determining a predetermined target valve duration of the CVVD apparatus according to the stop of the engine, in a response of determining that the vehicle operation information corresponds to the stop of the engine;
controlling a valve duration of the CVVD apparatus according to the predetermined target valve duration determined by the controller;
determining when a current revolutions per minute (RPM) of the engine is lower than a predetermined control stop RPM; and
stopping the controlling of the valve duration of the CVVD apparatus upon determining that the current RPM is lower than the predetermined control stop RPM,
wherein the predetermined target valve duration is a minimum valve duration to a maximum valve duration of 45% to 55%.

14. The system of claim 13 , wherein the controller is further configured of:
determining when a current valve duration of the CVVD apparatus has reached the predetermined target valve duration upon determining that the current RPM is not lower than the predetermined control stop RPM.

15. The system of claim 14 , wherein the controller is further configured of:
storing the current valve duration of the CVVD apparatus, in a response of determining that the current valve duration of the CVVD apparatus has reached the predetermined target valve duration.

16. The system of claim 14 ,
wherein the information detector includes an ignition key sensor, an RPM sensor, an accelerator pedal sensor, and a brake pedal sensor,
wherein the stop of the engine includes an ignition key off, an engine stall stop or a stop by an idle stop,
wherein the ignition key off is determined according to an output signal of the ignition key sensor,
wherein the engine stall stop is determined according to an output signal of the RPM sensor, and
wherein the stop by the idle stop is determined according to output signals of the accelerator pedal sensor and the brake pedal sensor.

17. The system of claim 16 ,
wherein the controller is configured to set an ignition target valve duration as the predetermined target valve duration in the ignition key off,
wherein the controller is configured to set an engine stall target valve duration as the predetermined target valve duration of the CVVD in the engine stall stop, and
wherein the controller is configured to set an idle stop target valve duration as the predetermined target valve duration in the stop by the idle stop.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Kia Corp

Inventors

• Moon Chi Ho

Classifications

• F02N11/0814

  comprising means for controlling automatic idle-start-stop · CPC title

• F02D2041/001

  for engines with variable valve actuation · CPC title

• F02D13/0215 Primary

  changing the valve timing only · CPC title

• F02N11/06

  and with ignition apparatus · CPC title

• F02D43/04

  using only digital means · CPC title