Control system for active vibration isolation support system and method of use

• US 20070029712A1
• Filed: 07/28/2006
• Published: 02/08/2007
• Est. Priority Date: 08/05/2005
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Nemoto, Hirotomi
• Granted Patent: US 7,717,408 B2
• Time in Patent Office: Days
• US Class Current: 267/140.400
• CPC Class Codes: F02B 75/22 with cylinders in V, fan, or star arrangement
• CPC Class Codes: F02D 17/02 Cutting-out cutting-out engines in multiple engine arrangements F02D25/04
• CPC Class Codes: F16F 13/268 comprising means for acting dynamically on the walls bounding an equilibration chamber F16F13/264 take precedence
• CPC Class Codes: F16F 15/02 Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems F16F15/005 takes precedence ; layered products B32B; suppression of vibration in ships B63; relieving load on bearings, using magnetic means F16C39/06

Abstract

In a V6 engine that can switch between a first running state and a second running state which differ in the number of cylinders that are permitted to operate, when switching from L3 selective cylinder operation to V4 selective cylinder operation is determined to be required, control of an active vibration isolation support system corresponding to L3 selective cylinder operation is normally continued for one cycle. However, in this case of switching from L3 selective cylinder operation to V4 selective cylinder operation, a vibration pattern of L3 selective cylinder operation continues for longer than usual, that is, for a period greater than one cycle. Therefore, control of the active vibration isolation support system corresponding to the vibration pattern of L3 selective cylinder operation is continued for two cycles of the vibration pattern, thereby further effectively improve a vibrational state when switching between running states from L3 selective cylinder operation to V4 selective cylinder operation.

Claims

1. A control system for an active vibration isolation support system which supports, on a vehicle body, an engine that can switch between a first running state and a second running state which differ in the number of cylinders that are permitted to operate,

the active vibration control system comprising an actuator, and

the control system comprising a control device for controlling the actuator according to a vibrational state of the engine so as to suppress transmission of vibration from the engine to the vehicle body,

wherein the control device continues control of the actuator corresponding to a vibration pattern of a running state prior to switching between running states for at least a period corresponding to one cycle of the vibration pattern, after determining that switching between the first and second running states is required, and

wherein, if the vibration pattern of the running state prior to switching between running states continues after the control device determines that switching between the first and second running states is required, the control device continues control of the actuator corresponding to the vibration pattern of the running state prior to switching between running states for a period corresponding to one cycle of the vibration pattern after extinction of the vibration pattern of the running state prior to the switching between running states.

2. The control system for an active vibration isolation support system of claim 1 wherein

the engine comprises six cylinders arranged in a V formation having a cyclic all-cylinder operation vibration pattern, and

wherein when switching between a running state comprising all-cylinder operation to a selective cylinder operation in which only three in-line cylinders are operating,

the engine switches over from all cylinder operation to three cylinder in-line operation at a time t1,

a final cycle of the all-cylinder operation vibration pattern ends at a time t2 which is subsequent to time t1, and

control of the active vibration isolation support system corresponding to all-cylinder operation is extended from the time t2 to a time t3, where the time period t3-t2 corresponds to one cycle of the all-cylinder operation vibration pattern.

3. The control system for an active vibration isolation support system of claim 2 wherein

control of the active vibration isolation support system corresponding to selective cylinder operation is started at the time t2 such that the time period t3-t2 is an overlap period where the control corresponding to selective cylinder operation overlaps control corresponding to all-cylinder operation.

4. The control system for an active vibration isolation support system of claim 1 wherein

the engine comprises six cylinders arranged in a V formation, and

wherein when switching between a running state comprising selective cylinder operation in which only three in-line cylinders are operating to an operating state in which all cylinders are operating,

the engine switches over from three in-line cylinder operation to all-cylinder operation at a time t1,

the three in-line cylinder operation comprises a cyclic three in-line cylinder operation vibration pattern, and a final cycle of the three in-line cylinder operation vibration pattern ends at a time t2 which is subsequent to time t1, and

control of the active vibration isolation support system corresponding to three in-line cylinder operation is extended from the time t2 to a time t3, where the time period t3-t2 corresponds to one cycle of the three in-line cylinder operation vibration pattern.

5. The control system for an active vibration isolation support system of claim 4 wherein

control of the active vibration isolation support system corresponding to selective cylinder operation is started at the time t2 such that the time period t3-t2 is an overlap period where the control corresponding to selective cylinder operation overlaps control corresponding to all-cylinder operation.

6. The control system for an active vibration isolation support system of claim 1 wherein

the engine comprises six cylinders arranged in a V formation, and

wherein when switching between a running state comprising selective cylinder operation in which only three in-line cylinders are operating to a running state comprising selective cylinder operation in which only four cylinders arranged in a V formation are operating, the engine switches over from said three cylinder operation to said four cylinder operation at a time t1,

the three in-line cylinder operation comprises a cyclic three in-line cylinder operation vibration pattern, and a final cycle of the three in-line cylinder operation vibration pattern ends at a time t2 which is subsequent to time t1, and

control of the active vibration isolation support system corresponding to three in-line cylinder operation is extended from the time t2 to a time t3, where the time period t3-t2 corresponds to two cycles of the three in-line cylinder operation vibration pattern.

7. The control system for an active vibration isolation support system of claim 6 wherein

control of the active vibration isolation support system corresponding to said four cylinder operation is started at the time t2 such that the time period t3-t2 is an overlap period where the control corresponding to three cylinder operation overlaps control corresponding to four cylinder operation.

8. The control system for an active vibration isolation support system of claim 1 wherein

the engine comprises six cylinders arranged in a V formation, and

wherein when switching between a running state comprising selective cylinder operation in which only four cylinders arranged in a V formation are operating to a running state comprising selective cylinder operation in which only three in-line cylinders are operating,

the engine switches over from said four cylinder operation to said three cylinder operation at a time t1,

the four cylinder operation comprises a cyclic 4V cylinder operation vibration pattern, and a final cycle of the 4V cylinder operation vibration pattern ends at a time t2 which is subsequent to time t1, and

control of the active vibration isolation support system corresponding to four cylinder operation is extended from the time t2 to a time t3, where the time period t3-t2 corresponds to one cycle of the 4V cylinder operation vibration pattern.

9. The control system for an active vibration isolation support system of claim 8 wherein

control of the active vibration isolation support system corresponding to said three cylinder operation is started at the time t2 such that the time period t3-t2 is an overlap period where the control corresponding to three cylinder operation overlaps control corresponding to four cylinder operation.

10. The control system for an active vibration isolation support system of claim 1 wherein control of the active vibration isolation support system comrprises

a read-in period in which the vibrational state of the engine is monitored for one cycle of the vibration pattern,

a calculation period immediately following the read-in period, the calculation period comprising one cycle of the vibration pattern during which calculation of a control current for the actuator is performed, and

a control period immediately following the calculation period, the control period comprising one cycle of the vibration pattern during which the control current is outputted to the actuator.

11. The control system for an active vibration isolation support system of claim 1 wherein operation of the active vibration isolation support system in a current cycle of vibration is based on the vibrational state of the cycle of vibration which occurred before the cycle of vibration previous to the current cycle of vibration.

12. A method of controlling an active vibration isolation support system which supports, on a vehicle body, an engine that can switch between a first running state and a second running state which differ in the number of cylinders that are permitted to operate,

the active vibration control system comprising an actuator, and

the control system comprising a control device for controlling the actuator according to a vibrational state of the engine so as to suppress transmission of vibration from the engine to the vehicle body,

the method comprising the following steps:

controlling the actuator corresponding to a vibration pattern of a running state prior to switching between running states for at least a period corresponding to one cycle of the vibration pattern, after determining that switching between the first and second running states is required, and

if the vibration pattern of the running state prior to switching between running states continues after the control device determines that switching between the first and second running states is required, controlling the actuator corresponding to the vibration pattern of the running state prior to switching between running states for a period corresponding to one cycle of the vibration pattern after extinction of the vibration pattern of the running state prior to the switching between running states.

13. The method of controlling an active vibration isolation support system of claim 12 wherein

the engine comprises six cylinders arranged in a V formation having a cyclic all-cylinder operation vibration pattern, and

wherein when switching between a running state comprising all-cylinder operation to a selective cylinder operation in which only three in-line cylinders are operating, the method comprises the following method steps:

switching the engine over from all cylinder operation to three cylinder in-line operation at a time t1,

ending a final cycle of the all-cylinder operation vibration pattern at a time t2 which is subsequent to time t1, and

extending control of the active vibration isolation support system corresponding to all-cylinder operation from the time t2 to a time t3, where the time period t3-t2 corresponds to one cycle of the all-cylinder operation vibration pattern.

14. The method of controlling an active vibration isolation support system of claim 12 wherein

the engine comprises six cylinders arranged in a V formation, and

wherein when switching between a running state comprising selective cylinder operation in which only three in-line cylinders are operating to an operating state in which all cylinders are operating and in which the three in-line cylinder operation comprises a cyclic three in-line cylinder operation vibration pattern, the method comprises the following method steps:

switching the engine over from three in-line cylinder operation to all-cylinder operation at a time t1,

ending a final cycle of the three in-line cylinder operation vibration pattern at a time t2 which is subsequent to time t1, and

extending control of the active vibration isolation support system corresponding to three in-line cylinder operation from the time t2 to a time t3, where the time period t3-t2 corresponds to one cycle of the three in-line cylinder operation vibration pattern.

15. The method of controlling an active vibration isolation support system of claim 12 wherein

the engine comprises six cylinders arranged in a V formation, and

wherein when switching between a running state comprising selective cylinder operation in which only three in-line cylinders are operating to a running state comprising selective cylinder operation in which only four cylinders arranged in a V formation are operating, and in which the three in-line cylinder operation comprises a cyclic three in-line cylinder operation vibration pattern, the method further comprising the following method steps:

switching the engine over from said three cylinder operation to said four cylinder operation at a time t1,

ending a final cycle of the three in-line cylinder operation vibration pattern at a time t2 which is subsequent to time t1, and

extending control of the active vibration isolation support system corresponding to three in-line cylinder operation from the time t2 to a time t3, where the time period t3-t2 corresponds to two cycles of the three in-line cylinder operation vibration pattern.

16. The method of controlling an active vibration isolation support system of claim 12 wherein

the engine comprises six cylinders arranged in a V formation, and

wherein when switching between a running state comprising selective cylinder operation in which only four cylinders arranged in a V formation are operating to a running state comprising selective cylinder operation in which only three in-line cylinders are operating, and in which four cylinder operation comprises a cyclic 4V cylinder operation vibration pattern, the method further comprises the following method steps:

switching the engine over from said four cylinder operation to said three cylinder operation at a time t1,

ending a final cycle of the 4V cylinder operation vibration pattern at a time t2 which is subsequent to time t1, and

extending control of the active vibration isolation support system corresponding to four cylinder operation from the time t2 to a time t3, where the time period t3-t2 corresponds to one cycle of the 4V cylinder operation vibration pattern.