Hydraulic controller and method of controlling same

• US 20050278102A1
• Filed: 06/09/2005
• Published: 12/15/2005
• Est. Priority Date: 06/10/2004
• Status: Active Grant

• Current Assignee: Jatco Limited (Nissan Motor Co., Ltd.)
• Original Assignee: Jatco Limited (Nissan Motor Co., Ltd.)
• Inventors: Takahashi, Seiichiro, Yabe, Yasushi, Kim, Jonggap
• Granted Patent: US 7,715,967 B2
• Time in Patent Office: Days
• US Class Current: 701/53
• CPC Class Codes: F16H 61/30 Hydraulic or pneumatic motors or related fluid control means therefor
• CPC Class Codes: F16H 61/66272 characterised by means for controlling the torque transmitting capability of the gearing

Abstract

A hydraulic controller includes an actuator for electrically controlling the hydraulic pressure, a hydraulic-pressure sensing part for sensing an actual value of the hydraulic pressure in the actuator, and an ECU for controlling the actuator. The ECU includes a fundamental hydraulic-pressure value command part for carrying out setting and command of a fundamental hydraulic-pressure command value, a feedforward control part for calculating through an inverse filter a first target hydraulic-pressure command value in accordance with the fundamental hydraulic-pressure command value, a feedback control part for calculating a second target hydraulic-pressure command value in accordance with the sensed actual value of the hydraulic pressure and the fundamental hydraulic-pressure command value, and a target control-amount determination part for determining a target control amount of the actuator in accordance with the first and second target hydraulic-pressure command value, wherein the ECU controls the actuator in accordance with the determined target control amount.

Claims

1. A hydraulic controller, comprising:

an actuator which electrically controls a hydraulic pressure;

a hydraulic-pressure sensing part which senses an actual value of the hydraulic pressure in the actuator; and

an electronic control unit (ECU) which controls the actuator, the ECU comprising;

a fundamental hydraulic-pressure value command part which carries out setting and command of a fundamental hydraulic-pressure command value;

a feedforward control part which calculates through an inverse filter a first target hydraulic-pressure command value in accordance with the fundamental hydraulic-pressure command value;

a feedback control part which calculates a second target hydraulic-pressure command value in accordance with the sensed actual value of the hydraulic pressure and the fundamental hydraulic-pressure command value; and

a target control-amount determination part which determines a target control amount of the actuator in accordance with the first and second target hydraulic-pressure command value,

the ECU controlling the actuator in accordance with the determined target control amount.

2. The hydraulic controller as claimed in claim 1, further comprising an oil-condition sensing part which senses an actual condition of oil,

wherein the feedforward control part comprises a plurality of inverse filters corresponding to the sensed actual condition of oil.

3. The hydraulic controller as claimed in claim 2, wherein the ECU further comprises a first failure detection part which detects a failure of the hydraulic-pressure sensing part,

wherein when the failure of the hydraulic-pressure sensing part is detected, the feedforward control part selects from the inverse filters an inverse filter corresponding to the sensed actual condition of oil so as to carry out feedforward control, and

wherein the target control amount is determined by the calculated first target hydraulic-pressure command value only.

4. The hydraulic controller as claimed in claim 2, wherein the ECU further comprises a second failure detection part which detects a failure of the oil-condition sensing part,

wherein when the failure of the oil-condition sensing part is detected, the feedforward control part selects from the inverse filters a predetermined inverse filter so as to carry out feedforward control, and

wherein the target control amount is determined by the calculated first target hydraulic-pressure command value only.

5. The hydraulic controller as claimed in claim 2, wherein the actual condition of oil is an oil temperature, wherein the oil-condition sensing part includes an oil-temperature sensing part.

6. The hydraulic controller as claimed in claim 5, wherein the predetermined inverse filter corresponds to the oil temperature in a normal range of a control target to which the hydraulic controller is applied.

7. The hydraulic controller as claimed in claim 5, wherein when the oil temperature is smaller than a predetermined value, the target control-amount determination part determines the target control amount by the first target hydraulic-pressure command value only.

8. The hydraulic controller as claimed in claim 6, wherein the control target is a continuously variable transmission (CVT) which carries out shifting by independently controlling the hydraulic pressures applied to drive and driven pulleys,

wherein the oil temperature in the normal range is 80°

C.

9. The hydraulic controller as claimed in claim 7, wherein the predetermined value is −

10°

C.

10. A method of controlling a hydraulic controller which comprises an actuator electrically controlling a hydraulic pressure and a hydraulic-pressure sensing part sensing an actual value of the hydraulic pressure in the actuator, the method comprising:

carrying out setting and command of a fundamental hydraulic-pressure command value;

calculating through an inverse filter a first target hydraulic-pressure command value in accordance with the fundamental hydraulic-pressure command value;

calculating a second target hydraulic-pressure command value in accordance with the sensed actual value of the hydraulic pressure and the fundamental hydraulic-pressure command value;

determining a target control amount of the actuator in accordance with the first and second target hydraulic-pressure command value; and

controlling the actuator in accordance with the determined target control amount.

11. The method as claimed in claim 10, further comprising:

determining whether or not the hydraulic-pressure sensing part is abnormal;

determining, if it is determined that the hydraulic-pressure sensing part fails to be abnormal, the target control amount in accordance with the first and second target hydraulic-pressure command values; and

determining, if it is determined that the hydraulic-pressure sensing part is abnormal, the target control amount in accordance with the first target hydraulic-pressure command value only.

12. The method as claimed in claim 10, further comprising:

determining whether or not a detection of an oil temperature is abnormal; and

determining, if it is determined that the detection of the oil temperature is abnormal, the target control amount in accordance with only the first target hydraulic-pressure command value calculated using an inverse filter corresponding to the oil temperature in a normal range.

13. The method as claimed in claim 10, further comprising:

determining, when a detected oil temperature is smaller than a predetermined value, the target control amount in accordance with the first target hydraulic-pressure command value only.

14. A hydraulic controller, comprising:

means for electrically controlling a hydraulic pressure;

means for sensing an actual value of the hydraulic pressure in the actuator; and

means for controlling the actuator, the controlling means comprising;

a fundamental hydraulic-pressure value command part which carries out setting and command of a fundamental hydraulic-pressure command value;

a feedforward control part which calculates through an inverse filter a first target hydraulic-pressure command value in accordance with the fundamental hydraulic-pressure command value;

a feedback control part which calculates a second target hydraulic-pressure command value in accordance with the sensed actual value of the hydraulic pressure and the fundamental hydraulic-pressure command value; and

a target control-amount determination part which determines a target control amount of the actuator in accordance with the first and second target hydraulic-pressure command value,

wherein the controlling means control the actuator in accordance with the determined target control amount.