Active vibration isolating support apparatus and method for controlling the same

• US 20090039577A1
• Filed: 08/08/2008
• Published: 02/12/2009
• Est. Priority Date: 08/10/2007
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Ishiguro, Tetsuya, Nemoto, Hirotomi, Fueki, Shungo
• Granted Patent: US 8,763,996 B2
• Time in Patent Office: Days
• US Class Current: 267/140.130
• CPC Class Codes: B60K 5/1283 Adjustable supports, e.g. the mounting or the characteristics being adjustable
• 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 15/002 characterised by the control method or circuitry control of mechanical oscillations per se G05D19/00
• 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

A method includes the steps of: detecting “starter ON” by IG-SW signal (step S12); calculating an moving average value T_CRKAVE of crank pulse intervals (steps S13-S17); determining engine starting when the T_CRKAVE is less than or equal to a threshold value T_th (step S19); and controlling a vibration isolating support unit M based on a natural vibration frequency of the engine when engine starting is determined (steps S20-S22).

Claims

1. An active vibration isolating support apparatus for reducing vibration transmitted from an engine comprising:

vibration isolating support units to elastically support the engine in a vehicle body each of which comprises an actuator; and

a control unit to estimate a vibrational state based on an output from a sensor for detecting a change in a revolution speed of the engine;

wherein the control unit drives the actuator to extend and contract so as to reduce transmission of vibration, and

wherein the control unit determines a detection of an initial explosion in the engine and drives the actuator of the vibration isolating support unit to extend and contract at a predetermined frequency if the estimated change in the revolution speed of the engine based on the output from the sensor is greater than or equal to a predetermined value after a time when engine starts.

2. The active vibration isolating support apparatus of claim 1,

wherein a reciprocating motion of a piston is converted to a rotary motion of a crankshaft in the engine, and

wherein the control unit controls the actuator of the vibration isolating support unit so as to reduce the transmission of roll vibration of the engine in a direction which is reverse to the rotation direction of the crankshaft of the engine if the initial explosion is determined to be detected after the time when the engine starts.

3. The active vibration isolating support apparatus of claim 2,

wherein the vibration isolating support units are disposed on opposite sides of the crankshaft, and

wherein the control unit drives the actuator of one of the vibration isolating support units to contract, the one of the vibration isolating support units is compressed by roll vibration associated with the initial explosion.

4. The active vibration isolating support apparatus of claim 1, wherein the control unit drives the actuator of the vibration isolating support unit to extend and contract at a natural vibration frequency determined by the engine and the vibration isolating support unit if the initial explosion is determined to be detected after the time when the engine starts.

5. The active vibration isolating support apparatus of claim 4,

wherein the control unit comprises the initial explosion determining unit to determine the detection of an initial explosion in the engine;

and a change detector to detect the magnitude of change in the revolution speed of the engine; and

wherein an elapsed time from the initial explosion to the predetermined revolution speed in the engine is measured, and a magnitude and a period of vibration at the natural vibration frequency of the engine is estimated based on the elapsed time.

11. The active vibration isolating support apparatus of claim 2, wherein the control unit drives the actuator of the vibration isolating support unit to extend and contract at a natural vibration frequency determined by the engine and the vibration isolating support unit if the initial explosion is determined to be detected after the time when the engine starts.

12. The active vibration isolating support apparatus of claim 3, wherein the control unit drives the actuator of the vibration isolating support unit to extend and contract at a natural vibration frequency determined by the engine and the vibration isolating support unit if the initial explosion is determined to be detected after the time when the engine starts.

13. The active vibration isolating support apparatus of claim 11,

wherein the control unit comprises the initial explosion determining unit to determine the detection of an initial explosion in the engine;

and a change detector to detect the magnitude of change in the revolution speed of the engine; and

wherein an elapsed time from the initial explosion to the predetermined revolution speed in the engine is measured, and a magnitude and a period of vibration at the natural vibration frequency of the engine is estimated based on the elapsed time.

14. The active vibration isolating support apparatus of claim 12,

wherein the control unit comprises the initial explosion determining unit to determine the detection of an initial explosion in the engine;

and a change detector to detect the magnitude of change in the revolution speed of the engine; and

wherein an elapsed time from the initial explosion to the predetermined revolution speed in the engine is measured, and a magnitude and a period of vibration at the natural vibration frequency of the engine is estimated based on the elapsed time.

6. In an active vibration isolating support apparatus for reducing vibration transmitted from an engine, wherein the engine in which a reciprocating motion of a piston is converted to a rotary motion of a crankshaft is supported via vibration isolating support units in a vehicle body each of which comprises an actuator, the active vibration isolating support apparatus comprising:

a control unit to make the actuator to extend and contract periodically depending on a vibrational state of the engine, thereby reducing transmission of vibration of the engine to a vehicle body,

wherein the control unit controls the actuator of the vibration isolating support unit so as to reduce transmission of roll vibration of the engine in a direction which is reverse to the rotation direction of the crankshaft of the engine if the initial explosion is determined to be detected after a time when the engine starts.

7. In an active vibration isolating support apparatus for reducing vibration transmitted from an engine, wherein a vibration isolating support units elastically support the engine in a vehicle body each of which comprises an actuator, the active vibration isolating support apparatus comprising:

a control unit to estimate a vibrational state of the engine based on a magnitude of change in a revolution speed of the engine to drive the actuator to extend and contract so as to reduce transmission of vibration,

the control unit comprising;

an initial explosion determining unit to determine a detection of an initial explosion in the engine; and

a change detector to detect the magnitude of change in the revolution speed of the engine;

wherein an elapsed time from the initial explosion to the predetermined revolution speed in the engine is measured, and a magnitude and a period of vibration at the natural vibration frequency of the engine is estimated based on the elapsed time.

8. An active vibration isolating support apparatus for reducing vibration transmitted from an engine comprising:

vibration isolating support units to elastically support the engine in a vehicle body each of which comprises an actuator;

a control unit to estimate a vibrational state based on an output from a sensor for detecting change in a revolution speed of the engine; and

a cylinder pressure sensor to detect cylinder pressure in the engine,

wherein the control unit determines an initial explosion in the engine with the cylinder pressure sensor at a time of engine starts, and drives the actuator to extend and contract at a predetermined fixed frequency.

9. A method for controlling an vibration isolating support unit to elastically support the engine in a vehicle body each of which comprises an actuator;

comprising the steps of;

estimating a vibrational state based on an output from a sensor for detecting change in a revolution speed of the engine;

determining a detection of an initial explosion in the engine if the estimated change in the revolution speed of the engine based on the output from the sensor is greater than a predetermined value at a time of engine starts; and

driving the actuator of the vibration isolating support unit to extend and contract at a natural vibration frequency determined by the engine and the vibration isolating support unit.

10. The method of claim 9, further comprising the steps of:

determining the detection of the initial explosion in the engine via an initial explosion determining unit;

measuring an elapsed time from the initial explosion to a predetermined revolution speed of the engine;

detecting a magnitude of change in the revolution speed of the engine based on the measured elapsed time; and

estimating a magnitude and a period of vibration at the natural vibration frequency of the engine based on the detected magnitude of change in the revolution speed of the engine.