IP Library › Granted Patent US 10,408,151

Granted Patent B2

US 10,408,151 · App. 15/829,920 · Granted Sep 10, 2019

Control device

Inventors: Minoru Hotta (Kariya, JP); Yoshihiko Nonogaki (Kariya, JP); Kazuteru Iwamoto (Iwata, JP); Makoto Wakimura (Iwata, JP); Naoki Nagata (Kariya, JP)

Assignees: DENSO CORPORATION; YAMAHA HATSUDOKI KABUSHIKI KAISHA

F02D41/1498 F02B75/02 F02B77/08 F02D41/0097 F02D41/1497 F02D41/22 F02D45/00 G07C5/0825 F02B61/02 F02B2075/027 F02D2041/286 F02D2200/101 F02D2200/1015

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Quick Facts

Patent No.: US 10,408,151
App. No.: 15/829,920
Granted: Sep 10, 2019
Kind: B2

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Abstract

A control device for a rotating element rotated by a four-stroke engine has a high degree of freedom in the choice of an apparatus to which the control device is applicable. The control device includes a rotation speed acquisition unit configured to obtain a rotation speed of the rotating element rotated by the four-stroke engine, and an undulation detection unit configured to, based on the rotation speed obtained by the rotation speed acquisition unit, detect a periodic undulation contained in a rotation fluctuation of the four-stroke engine, the periodic undulation having an angular period longer than a crank angle corresponding to four strokes.

Claims (46)

1. A control device for a rotating element that is rotated by a four-stroke engine,the control device comprising:

a rotation speed acquisition unit configured to obtain a rotation speed of the rotating element rotated by the four-stroke engine;

an undulation detection unit configured to, based on the rotation speed obtained by the rotation speed acquisition unit, detect a periodic undulation contained in a rotation fluctuation of the four-stroke engine, the periodic undulation having an angular period longer than a crank angle corresponding to four strokes; and

an undulation removal unit configured to remove the periodic undulation detected by the undulation detection unit from a rotation speed of the four-stroke engine obtained based on the rotation speed of the rotating element;

wherein

2. The control device according to claim 1 , wherein

the undulation detection unit is configured to detect the periodic undulation by repeatedly calculating an average rotation speed of the four-stroke engine in a 360-degree crank angle zone based on the rotation speed obtained by the rotation speed acquisition unit.

3. The control device according to claim 1 , wherein

the undulation detection unit is configured to detect the periodic undulation by repeatedly calculating an average rotation speed of the four-stroke engine in a 720-degree crank angle zone based on the rotation speed obtained by the rotation speed acquisition unit.

4. The control device according to claim 1 , wherein

the undulation detection unit is configured to detect the periodic undulation by repeatedly calculating an average rotation speed of the four-stroke engine in a (360×m)-degree crank angle zone and to detect the periodic undulation by repeatedly calculating the average rotation speed of the four-stroke engine in a (360×n)-degree crank angle zone, where n represents a natural number different from m, based on the rotation speed obtained by the rotation speed acquisition unit.

5. The control device according to claim 1 , wherein

the undulation detection unit is configured to detect a component of the periodic undulation at a detection target crank angle position, based on a rotation speed in a range from a crank angle position before the detection target crank angle position to a crank angle position after the detection target crank angle position, the rotation speed in the range being obtained by the rotation speed acquisition unit.

6. The control device according to any one of claims 1 or 2 to 5 , wherein

the rotation speed acquisition unit is configured to obtain a rotation speed of the rotating element included in a vehicle, the rotating element being rotated by the four-stroke engine that is provided in the vehicle so as to drive the vehicle, and

the undulation detection unit is configured to detect the periodic undulation contained in a rotation speed of the four-stroke engine provided in the vehicle, based on the rotation speed obtained by the rotation speed acquisition unit.

7. The control device according to claim 6 , wherein

the rotation speed acquisition unit is configured to obtain a rotation speed of the rotating element rotated by the four-stroke engine that is provided in the vehicle so as to drive a wheel of the vehicle, and

the undulation detection unit is configured to detect the periodic undulation contained in a rotation speed of the four-stroke engine that drives the wheel, based on the rotation speed obtained by the rotation speed acquisition unit.

8. The control device according to claim 7 , wherein

the rotation speed acquisition unit is configured to obtain a rotation speed of the rotating element rotated by the four-stroke engine for driving the wheel that is supported by a suspension of the vehicle so as to be swingable in a vertical direction about a shaft extending in a lateral direction of a vehicle body of the vehicle, and

the undulation detection unit is configured to detect the periodic undulation contained in a rotation speed of the four-stroke engine for driving the wheel that is supported to the vehicle body in a front-rear direction so as to be swingable in the vertical direction by the suspension, based on the rotation speed obtained by the rotation speed acquisition unit.

9. The control device according to any one of claims 1 or 2 to 5 , wherein

the control device further comprises at least one misfire determination unit configured to determine a presence or absence of a misfire in the four-stroke engine based on a rotation fluctuation attributable to combustion of the four-stroke engine, the rotation fluctuation attributable to combustion of the four-stroke engine being obtained by removal of a periodic undulation detected by the undulation detection unit from the rotation speed of the four-stroke engine.

10. The control device according to claim 9 , wherein

the at least one misfire determination unit includes two misfire determination units configured to determine the presence or absence of a misfire in the four-stroke engine based on rotation fluctuations in different crank angle zones, respectively, and

the two misfire determination units determine the presence or absence of a misfire in the four-stroke engine based on rotation fluctuations each obtained by removal of a periodic undulation from the rotation speed of the four-stroke engine, the periodic undulation being detected by the undulation detection unit calculating the average rotation speed in a same crank angle zone.

11. The control device according to claim 9 , wherein

12. The control device according to claim 11 , wherein

the undulation detection unit is configured to detect the periodic undulation contained in a rotation speed of the four-stroke engine that drives the wheel, based on a rotation speed obtained by the rotation speed acquisition unit.

13. The control device according to claim 12 , wherein

14. The control device according to claim 10 , wherein

15. The control device according to claim 14 , wherein

16. The control device according to claim 15 , wherein

Assignments (1)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 22, 2018

From: HOTTA, MINORU; NONOGAKI, YOSHIHIKO; IWAMOTO, KAZUTERU; WAKIMURA, MAKOTO; NAGATA, NAOKI

To: DENSO CORPORATION; YAMAHA HATSUDOKI KABUSHIKI KAISHA

Reel/Frame 045002/0319 →

Priority Claims (1)

JP 2015-111921 · Jun 2, 2015 · national

Continuity (2)

Continuation In Part PCTJP2016066206 · Jun 1, 2016

Related Publication 20180087462A1 · Mar 29, 2018