1. An active vibration control system for use in a hybrid vehicle having a generator motor for assisting an engine in rotating a crankshaft thereof, comprising:
a basic signal generator for generating a harmonic basic signal from a rotational frequency of the crankshaft;
an adaptive notch filter for being supplied with said basic signal and outputting a control signal;
a combiner for combining said control signal and a drive signal for said generator motor with each other and supplying a combined signal to said generator motor;
an error signal detector for detecting a rotational speed fluctuation of the crankshaft and outputting an error signal representative of the detected rotational speed fluctuation;
a corrective filter for being supplied with said basic signal and outputting a reference signal, said corrective filter having a transfer function of said generator motor; and
filter coefficient updating means for being supplied with said error signal and said reference signal and successively updating a filter coefficient of said adaptive notch filter so that said error signal will be minimized,
wherein the control signal effects only frequencies relative to the rotational speed fluctuation of the crankshaft, and the drive signal is representative of a motor assistance signal, and
wherein the system suppresses a torque fluctuation of the crankshaft in response to the torque fluctuation without detriment to a response of the motor assistance signal.
2. A hybrid vehicle incorporating an active vibration control system according to claim 1.
3. An active vibration control system according to claim 1, wherein the drive signal for said generator motor is representative of a field current value and a rotational speed that correspond to a to-be-applied torque proportional to a throttle valve opening g.
4. A method of improving a vibration control capability of a hybrid vehicle having a generator motor for assisting an engine in rotating a crankshaft thereof, comprising the steps of:
generating a harmonic basic signal from a rotational frequency of the crankshaft with a basic signal generator;
multiplying a transfer function of said generator motor by said basic signal with a reference signal generating circuit to generate a reference signal;
detecting a rotational speed fluctuation of said crankshaft with an error signal detector to generate an error signal;
updating a filter coefficient of an adaptive notch filter so that said error signal will be minimized, based on said reference signal and said error signal, with filter coefficient updating means;
processing said basic signal with said adaptive notch filter to generate a control signal; and
combining said control signal and a drive signal for said generator motor with each other and supplying a combined signal to said generator motor, wherein the control signal effects only frequencies relative to the rotational speed fluctuation of the crankshaft, and the drive signal is representative of a motor assistance signal;
whereby vibrations of said crankshaft is reduced to increase a vibration control capability of said hybrid vehicle, and
whereby a torque fluctuation of the crankshaft is suppressed in response to the torque fluctuation without detriment to a response of the motor assistance signal.
5. A method of improving a vibration control capability according to claim 4, wherein the drive signal for said generator motor is representative of a field current value and a rotational speed that correspond to a to-be-applied torque proportional to a throttle valve opening.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A heat dissipation device comprising:
a heat-absorbing portion adapted for being attached to a heat-generating electronic component;
a heat-dissipating portion comprising a plurality of fins extending from the heat-absorbing portion and being disposed on the heat-absorbing portion; and
a heat capacitor attached to the heat-absorbing portion, the heat capacitor comprising a sealed container made of a material with a high heat conductivity and a heat-storing material made of a phase-change thermal interface material, the heat-storing material being received in the container, the heat-storing material changing from solid state to liquid state when absorbing heat from the heat-generating electronic component.
2. The heat dissipation device as claimed in claim 1, wherein the heat capacitor is located on the heat-absorbing portion and in the heat-dissipating portion.
3. The heat dissipation device as claimed in claim 2, wherein the heat-absorbing portion defines a groove receiving a bottom of the heat capacitor.
4. The heat dissipation device as claimed in claim 2, wherein the heat-absorbing portion is a plate-like base and the heat-dissipating portion is a fin assembly disposed on the base.
5. The heat dissipation device as claimed in claim 4, wherein the base defines a groove in a center thereof to divide the fin assembly into two parts.
6. The heat dissipation device as claimed in claim 5, wherein each part comprises a support extending from the base, a plurality of first and second fins arranged on two lateral sides of the support, the first and second fins being parallel and perpendicular to the base, respectively.
7. The heat dissipation device as claimed in claim 6, wherein a bottom of the heat capacitor is received in the groove.
8. A heat dissipation device comprising:
a base having a bottom surface for contacting a heat-generating electronic component thereon;
a fin assembly disposed on a top surface of the base, the fin assembly comprising two supports extending upwardly and outwardly from the base, each support comprising a plurality of fins arranged on two opposite sides thereof; and
a heat capacitor disposed on the top surface of the base and located corresponding to the heat-generating electronic component, the heat capacitor comprising a sealed container made of a material having a high heat conductivity and a heat-storing material disposed within the container;
wherein the heat-storing material is capable of changing from a first state to a second state by absorbing heat and changing from the second state to the first state by releasing the heat stored therein, and wherein the first state is a solid state and the second state is a liquid state.
9. The heat dissipation device as claimed in claim 8, wherein the heat-storing material is made of a phase-change thermal interface material.
10. The heat dissipation device as claimed in claim 9, wherein the heat capacitor is located on the base and in the fin assembly.
11. The heat dissipation device as claimed in claim 9, wherein the base defines a groove in the top surface thereof and a bottom of the heat capacitor is thermally contacted with the top surface of the base at a bottom extremity of the groove.
12. The heat dissipation device as claimed in claim 11, wherein each support comprises a plurality of first fins parallel to the base and a plurality of second fins perpendicular to the base.
13. The heat dissipation device as claimed in claim 12, wherein the fin assembly is divided into two symmetrical parts by the groove.
14. A heat dissipation device comprising:
a base having a bottom face contacting with a heat-generating electronic component;
a heat capacitor mounted to the base and located above the heat-generating electronic component; and
a plurality of fins extending from the base and located beside the heat capacitor, wherein the heat capacitor receives a phase-change thermal interface material therein, the phase-change thermal interface material changing from solid state to liquid state upon receiving heat from the heat-generating electronic component.
15. The heat dissipation device as claimed in claim 8, wherein each of the supports extends slantwise from the base, and there is an acute angle between the base and each of the supports.
16. The heat dissipation device as claimed in claim 15, wherein a plurality of first fins extends vertically from each of the supports, and a plurality of second fins extends horizontally from each of the supports, and the first and second fins are located at flanks of each of the supports.
17. The heat dissipation device as claimed in claim 16, wherein the first fins have different lengths along a vertical direction and the second fins have different lengths along a horizontal direction.
18. The heat dissipation device as claimed in claim 15, wherein the two supports form a V-shaped configuration extending from the base.