Control device

Patent metadata

Field	Value
Publication number	US-10955046-B2
Application number	US-201816623572-A
Country	US
Kind code	B2
Filing date	Aug 27, 2018
Priority date	Aug 28, 2017
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A control device that includes an electronic control unit that is configured to perform, when specific control that causes a change in a state of a hydraulic circuit in the hydraulic control device that involves an increase in hydraulic pressure at the discharge port is performed in a state in which a rotational speed of the electric motor is a first rotational speed, torque increase control that controls drive of the electric motor such that torque of the electric motor starts to increase before hydraulic pressure at the discharge port increases by the specific control.

First claim

The invention claimed is:

1. A control device whose control target is an oil supply device including a motor-driven oil pump driven by an electric motor; and a hydraulic control device that controls hydraulic pressure of oil discharged from a discharge port of the motor-driven oil pump, and supplies the oil to a vehicle drive transmission device, the control device driving the electric motor by sensorless control performed based on an estimated rotational position or an estimated rotational speed, the control device comprising:
an electronic control unit that is configured to perform,
when specific control that causes a change in a state of a hydraulic circuit in the hydraulic control device that involves an increase in hydraulic pressure at the discharge port is performed in a state in which a rotational speed of the electric motor is a first rotational speed, torque increase control that controls drive of the electric motor such that torque of the electric motor starts to increase before hydraulic pressure at the discharge port increases by the specific control.

2. The control device according to claim 1 , wherein the first rotational speed is a rotational speed determined based on an amount of oil required by the vehicle drive transmission device.

3. The control device according to claim 1 , wherein in the torque increase control, drive of the electric motor is controlled such that a rotational speed of the electric motor after an increase in hydraulic pressure at the discharge port is maintained higher than or equal to a minimum rotational speed at which the sensorless control can be performed.

4. The control device according to claim 3 , wherein in the torque increase control, drive of the electric motor is controlled such that a rotational speed of the electric motor starts to increase from the first rotational speed before hydraulic pressure at the discharge port increases by the specific control.

5. The control device according to claim 4 , wherein a rotational speed of the electric motor is reduced to the first rotational speed after a lapse of a predetermined period of time from a start of the torque increase control.

6. The control device according to claim 5 , wherein an instruction to start the specific control is provided after providing an instruction to start the torque increase control.

7. The control device according to claim 6 , wherein the specific control is a control for switching the hydraulic circuit in order to change a destination of oil to be supplied, the oil being discharged from the discharge port.

8. The control device according to claim 6 , wherein
the hydraulic control device includes:
a discharge oil passage connected to the discharge port; and
a hydraulic regulating valve provided in the discharge oil passage and regulating hydraulic pressure on an upstream side to set hydraulic pressure by emitting part of oil discharged from the discharge port to a downstream side, and

the specific control is a control for changing a hydraulic pressure instruction provided to the hydraulic regulating valve in order to increase the set hydraulic pressure.

9. The control device according to claim 6 , wherein
the hydraulic control device includes a solenoid valve provided in an oil passage in the hydraulic circuit and regulating whether to supply hydraulic pressure to a downstream side, or hydraulic pressure supplied to a downstream side, and
the specific control is a control for changing a state of the solenoid valve.

10. The control device according to claim 1 , wherein in the torque increase control, drive of the electric motor is controlled such that a rotational speed of the electric motor after an increase in hydraulic pressure at the discharge port is maintained higher than or equal to a minimum rotational speed at which the sensorless control can be performed.

11. The control device according to claim 1 , wherein in the torque increase control, drive of the electric motor is controlled such that a rotational speed of the electric motor starts to increase from the first rotational speed before hydraulic pressure at the discharge port increases by the specific control.

12. The control device according to claim 1 , wherein an instruction to start the specific control is provided after providing an instruction to start the torque increase control.

13. The control device according to claim 1 , wherein the specific control is a control for switching the hydraulic circuit in order to change a destination of oil to be supplied, the oil being discharged from the discharge port.

14. The control device according to claim 1 , wherein
the hydraulic control device includes:
a discharge oil passage connected to the discharge port; and
a hydraulic regulating valve provided in the discharge oil passage and regulating hydraulic pressure on an upstream side to set hydraulic pressure by emitting part of oil discharged from the discharge port to a downstream side, and

the specific control is a control for changing a hydraulic pressure instruction provided to the hydraulic regulating valve in order to increase the set hydraulic pressure.

15. The control device according to claim 1 , wherein
the hydraulic control device includes a solenoid valve provided in an oil passage in the hydraulic circuit and regulating whether to supply hydraulic pressure to a downstream side, or hydraulic pressure supplied to a downstream side, and
the specific control is a control for changing a state of the solenoid valve.

16. The control device according to claim 2 , wherein in the torque increase control, drive of the electric motor is controlled such that a rotational speed of the electric motor starts to increase from the first rotational speed before hydraulic pressure at the discharge port increases by the specific control.

17. The control device according to claim 2 , wherein an instruction to start the specific control is provided after providing an instruction to start the torque increase control.

18. The control device according to claim 2 , wherein the specific control is a control for switching the hydraulic circuit in order to change a destination of oil to be supplied, the oil being discharged from the discharge port.

19. The control device according to claim 2 , wherein
the hydraulic control device includes:
a discharge oil passage connected to the discharge port; and
a hydraulic regulating valve provided in the discharge oil passage and regulating hydraulic pressure on an upstream side to set hydraulic pressure by emitting part of oil discharged from the discharge port to a downstream side, and

the specific control is a control for changing a hydraulic pressure instruction provided to the hydraulic regulating valve in order to increase the set hydraulic pressure.

20. The control device according to claim 2 , wherein
the hydraulic control device includes a solenoid valve provided in an oil passage in the hydraulic circuit and regulating whether to supply hydraulic pressure to a downstream side, or hydraulic pressure supplied to a downstream side, and
the specific control is a control for changing a state of the solenoid valve.

Assignees

• Aisin Aw Co

Inventors

• Nishimura Keisuke
• Tajima Yoichi
• Okasaka Kazuomi

Classifications

• F04B49/06 Primary

  Control using electricity (regulating by means of floats actuating electric switches F04B49/04) · CPC title

• F04B2205/02

  Pressure in the inlet chamber · CPC title

• F04B2203/0207

  Torque · CPC title

• F16H61/0206

  Layout of electro-hydraulic control circuits, e.g. arrangement of valves · CPC title

• F04B2203/0209

  Rotational speed · CPC title