US20060192329A1 - Actuator drive control device for active vibration isolation support system, and actuator drive control method for the same - Google Patents
Actuator drive control device for active vibration isolation support system, and actuator drive control method for the same Download PDFInfo
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- US20060192329A1 US20060192329A1 US11/362,356 US36235606A US2006192329A1 US 20060192329 A1 US20060192329 A1 US 20060192329A1 US 36235606 A US36235606 A US 36235606A US 2006192329 A1 US2006192329 A1 US 2006192329A1
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- Prior art keywords
- engine
- vibration
- accumulated time
- support system
- isolation support
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—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
- F16F15/023—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 using fluid means
- F16F15/027—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 using fluid means comprising control arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K5/00—Arrangement or mounting of internal-combustion or jet-propulsion units
- B60K5/12—Arrangement of engine supports
- B60K5/1208—Resilient supports
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
- F16F13/26—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper characterised by adjusting or regulating devices responsive to exterior conditions
- F16F13/268—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper characterised by adjusting or regulating devices responsive to exterior conditions comprising means for acting dynamically on the walls bounding an equilibration chamber
Definitions
- the present invention relates to an actuator drive control device and an actuator drive control method for an active vibration isolation support system, in which an operation of an actuator is controlled based on a vibration state of an engine which is estimated from rotational variation of a crankshaft, so as to suppress transmission of vibration from an engine.
- Such an active vibration isolation support system is known from Japanese Patent Laid-open No. 2003-113892.
- This active vibration isolation support system calculates a crank angular speed from a time interval of crank pulses which are outputted at each predetermined rotational angle of the crankshaft; calculates torque of the crankshaft from a crank angular acceleration obtained by differentiating the crank angular speed with respect to time; estimates the vibration state of the engine as a variation amount of torque; and controls application of electrical current to a coil of an actuator in accordance with the vibration state of the engine, to effect the vibration isolation function.
- FIG. 8A shows a variation waveform of the crank angular speed in the case where an engine rotational speed Ne is substantially constant.
- the variation waveform of the crank angular speed is in a sine wave shape, the angular acceleration of the crankshaft can be approximated at a value 2 ⁇ /T which is obtained by dividing a variation amount ⁇ by a half of one period T. Accordingly, based on the difference between “+2 ⁇ /T” that is a positive crank angular acceleration in the one period of the variation waveform of the crank angular speed and “ ⁇ 2 ⁇ /T” that is a negative crank angular acceleration, the torque variation of the crankshaft, namely, the vibration state of the engine can be estimated.
- FIG. 8B shows a variation waveform of the crank angular speed in the case where the engine rotational speed Ne increases.
- the regular variation amount ⁇ of the crank angular speed should be measured in the direction orthogonal to the straight line representing the engine rotational speed Ne, but actually a variation amount ⁇ ′ in the direction parallel to the vertical axis is measured, so that the variation amount ⁇ ′ becomes smaller than the regular variation amount ⁇ . Accordingly, an error disadvantageously occurs when the vibration state of the engine is estimated based on the variation amount ⁇ ′ in the direction parallel to the vertical axis. This problem also occurs in the case where the engine rotational speed Ne decreases.
- the present invention has been achieved under the above-mentioned circumstances, and has an object to accurately estimate a vibration state of an engine when an engine rotational speed increases and decreases, thereby precisely controlling an active vibration isolation support system.
- an actuator drive control device for an active vibration isolation support system comprising a control apparatus which controls an operation of an actuator based on a vibration state of an engine which is estimated from a rotational variation of a crankshaft, so as to suppress transmission of a vibration of the engine, wherein the control apparatus calculates accumulated time of time intervals of crank pulse outputted at each predetermined crank angle for one period of engine vibration; calculates average accumulated time averaged for the one period of engine vibration; and controls the actuator of the active vibration isolation support system based on the vibration state of the engine which is estimated from a variation waveform of deviation obtained by subtracting the average accumulated time from the accumulated time at each predetermined crank angle.
- control apparatus calculates the average accumulated time based on the accumulated time over the one period of engine vibration.
- an actuator drive control method for an active vibration isolation support system for controlling an operation of an actuator based on a vibration state of an engine which is estimated from a rotational variation of a crankshaft in order to suppress transmission of engine vibration, the method comprising: a first step of calculating accumulated time of time intervals of crank pulse outputted at each predetermined crank angle for one period of engine vibration; a second step of calculating average accumulated time averaged for the one period of engine vibration; a third step of calculating deviation obtained by subtracting the average accumulated time from the accumulated time at each predetermined crank angle; a fourth step of estimating the vibration state of the engine from a variation waveform of the deviation; a fifth step of controlling the actuator of the active vibration isolation support system based on the vibration state of the engine.
- the second step calculates the average accumulated time based on the accumulated time over the one period of engine vibration.
- the fourth step calculates torque around the crankshaft based on the deviation at each predetermined crank angle, and estimates the vibration state of the engine based on a difference between the maximum torque value and the minimum torque value which are adjacent in time.
- the influence of the variation in the angular speed of the crankshaft attributable to the increase and decrease of the engine rotational speed is properly eliminated, thus precisely estimating the actual vibration state of the engine.
- the electronic control unit U in the embodiment corresponds to the control apparatus of the present invention.
- FIG. 1 is a vertical sectional view of an active vibration isolation support system according to an illustrative embodiment of the present invention.
- FIG. 2 is a sectional view taken along the line 2 - 2 in FIG. 1 .
- FIG. 3 is a sectional view taken along the line 3 - 3 in FIG. 1 .
- FIG. 4 is an enlarged view of an essential part of FIG. 1 .
- FIG. 5 is a flow chart explaining an operation of an embodiment.
- FIG. 6 is a diagram explaining step S 5 of the flow chart in FIG. 5 .
- FIGS. 8A and 8B are diagrams explaining a conventional method for obtaining the crank angular acceleration.
- An active vibration isolation support system M shown in FIG. 1 to FIG. 4 elastically supports an engine E (V-type four-cycle six-cylinder engine in this embodiment) of an automobile in a vehicle body frame F.
- the system is controlled by an electronic control unit U to which a crank pulse sensor Sa is connected for detecting crank pulses that are outputted accompanying rotation of a crankshaft of the engine E. Twenty-four crank pulses are outputted per rotation of the crankshaft, that is, one crank pulse is outputted for every 15 degrees of crank angle.
- the outer periphery of a second elastic body 18 made of a rubber membrane is fixed by vulcanization bonding to the inner periphery of the third orifice-forming member 17 .
- An outer cap member 19 fixed by vulcanization bonding to the inner periphery of the second elastic body 18 , is fixed by press fitting onto a movable member 20 disposed on the axis L to be vertically movable.
- the outer periphery of a diaphragm 22 is fixed by vulcanization bonding to a ring member 21 that is fixed to the crimping fixing part 13 a of the outer tube 13 .
- An inner cap member 23 fixed by vulcanization bonding to the inner periphery of the diaphragm 22 , is fixed onto the movable member 20 by press fitting. The inner cap member 23 fits closely inside the outer cap member 19 .
- a first liquid chamber 24 which is charged with a liquid, is thus defined between the first elastic body 14 and the second elastic body 18
- a second liquid chamber 25 which is charged with a liquid, is thus defined between the second elastic body 18 and the diaphragm 22 .
- the first liquid chamber 24 and the second liquid chamber 25 communicates with each other via an upper orifice 26 and a lower orifice 27 which are formed by the first to third orifice-forming members 15 , 16 and 17 .
- a lower orifice 27 is an annular passage formed between the second orifice-forming member 16 and the third orifice-forming member 17 .
- the communicating hole 16 a is formed in the second orifice-forming member 16 on one side of a partition wall 27 a provided in a part of the lower orifice 27
- a communicating hole 17 a is formed in the third orifice-forming member 17 on the other side of the partition wall 27 a . Therefore, the lower orifice 27 is formed over substantially one round from the communicating hole 16 a of the second orifice-forming member 16 to the communicating hole 17 a of the third orifice-forming member 17 (see FIG. 3 ).
- the first liquid chamber 24 and the second liquid chamber 25 communicate with each other via the upper orifice 26 and the lower orifice 27 which are connected to each other in series.
- An annular mounting bracket 28 for fixing the active vibration isolation support system M to the vehicle body frame F is fixed to the crimping fixing part 13 a of the outer tube 13 , and an actuator housing 30 constructing an outer shell of an actuator 29 for driving the movable member 20 is welded to a lower surface of the mounting bracket 28 .
- a cylindrical slider 43 is slidably fitted in the inner periphery of the bearing 36 , and a shaft part 20 a extending downward from the movable member 20 loosely penetrates through an upper base part of the bearing 36 to be connected to a boss 44 that is fixed to an interior of the slider 43 .
- a coil spring 41 is disposed between the upper base part of the bearing 36 and the slider 41 . The bearing 36 is biased upward by this coil spring 41 , and the slider 43 is biased downward by the coil spring 41 .
- the elastic force of the coil spring 41 increases, thereby lowering the slider 43 while compressing the coil spring 45 , the movable member 20 that is connected to the slider 43 via the boss 44 and the shaft part 20 a descends, and the second elastic body 18 connected to the movable member 20 deforms downward, thus increasing the capacity of the first liquid chamber 24 .
- the movable member 20 rises, the second elastic body 18 deforms upward, and the capacity of the first liquid chamber 24 decreases.
- the shapes and dimensions of the upper orifice 26 and the lower orifice 27 and the spring constant of the first elastic body 14 are set so that a high spring constant and a high attenuation force can be obtained in a region of the frequency of engine shake vibration, the vibration that is transmitted from the engine E to the vehicle body frame F can be reduced effectively.
- the actuator 29 In this frequency region of the engine shake vibration, the actuator 29 is maintained in a non-operational state.
- a crank angle of a vibration period of an engine E is determined.
- the crank angle of the vibration period is 120 degrees.
- eight crank pulses are outputted at every 15 degrees of the crank angle.
- the crank angle of this vibration period is 240 degrees, during which period, 16 crank pulses are outputted.
- step S 2 eight crank pulses in a vibration period T are read, and the time intervals of the crank pulses are calculated. As shown in FIG. 7 , eight crank pulses are outputted during the vibration period T, and the time intervals tn (t 1 , t 2 , t 3 . . . t 8 ) vary according to the variation in the angular speed of the crankshaft.
- the accumulated time ⁇ tn corresponds to the vibration period T.
- step S 5 eight deviations ⁇ t 1 , ⁇ t 2 , ⁇ t 3 , . . . , ⁇ t 8 are calculated by subtracting the average accumulated time from the accumulated time at each position at every 15 degrees of the crank angle.
- the line curved in the shape of S at the lower side in FIG. 6 represents a deviation ⁇ tn, and this line corresponds to a variation waveform of the time interval tn of the crank pulses from which the influence of the variation in the engine rotational speed Ne is eliminated, namely, the deviation with respect to the time interval tn of the crank pulses in the case where the crank angular speed ⁇ is constant.
- step S 9 the maximum torque value and the minimum torque value that are adjacent in time are determined, and the vibration state (amplitude) of the engine E is calculated as a difference between the maximum value and the minimum value of the torque, namely, the amount of change in torque.
- the active vibration isolation support system M for supporting the engine E of an automobile is shown as an example, but the active vibration isolation support system M of the present invention is applicable to support for any engine not for an automobile.
- the accumulated time ⁇ tn may be calculated from the rotational speed of the engine without accumulating the time intervals tn.
- the accumulated time ⁇ tn corresponds to a crank angle of 120° in the six-cylinder engine of the embodiment, the accumulated time ⁇ tn may be calculated as time required for a crank angle of 120° from the engine rotational speed.
- the time interval tn of the crank pulse after eliminating the influence of the variation in the engine rotational speed Ne is in proportion to an amount of the torque variation
- the amount of the torque variation can be calculated by multiplying the time interval tn by a predetermined coefficient. Therefore, the torque maximum value and the torque minimum value in step 9 can be easily calculated from the amount of the torque variation.
Abstract
In an actuator drive control device for an active vibration isolation support system, accumulated time of eight time intervals tn of crank pulses which are outputted at every 15 degrees of a crank angle in a vibration period corresponding to 120 degrees of the crank angle, and average accumulated time shown by a straight line connecting a start point and an end point of the line of the accumulated time are calculated. Eight deviations Δtn are calculated by subtracting the average accumulated time from the accumulated time. A variation waveform of the deviations Δtn corresponds to a variation waveform of the time interval tn of the crank pulses attributable only to the engine vibration with the influence of a variation in the engine rotational speed Ne being eliminated.
Description
- 1. Field of the Invention
- The present invention relates to an actuator drive control device and an actuator drive control method for an active vibration isolation support system, in which an operation of an actuator is controlled based on a vibration state of an engine which is estimated from rotational variation of a crankshaft, so as to suppress transmission of vibration from an engine.
- 2. Description of the Related Art
- Such an active vibration isolation support system is known from Japanese Patent Laid-open No. 2003-113892.
- This active vibration isolation support system, described in the reference, calculates a crank angular speed from a time interval of crank pulses which are outputted at each predetermined rotational angle of the crankshaft; calculates torque of the crankshaft from a crank angular acceleration obtained by differentiating the crank angular speed with respect to time; estimates the vibration state of the engine as a variation amount of torque; and controls application of electrical current to a coil of an actuator in accordance with the vibration state of the engine, to effect the vibration isolation function.
-
FIG. 8A shows a variation waveform of the crank angular speed in the case where an engine rotational speed Ne is substantially constant. The variation waveform of the crank angular speed is in a sine wave shape, the angular acceleration of the crankshaft can be approximated at a value 2ω/T which is obtained by dividing a variation amount Δω by a half of one period T. Accordingly, based on the difference between “+2ω/T” that is a positive crank angular acceleration in the one period of the variation waveform of the crank angular speed and “−2ω/T” that is a negative crank angular acceleration, the torque variation of the crankshaft, namely, the vibration state of the engine can be estimated. - In the example shown in
FIG. 8A , the engine rotational speed Ne is substantially constant, but when the conventional method is applied to the case where the engine rotational speed Ne increases or decreases, the following problem occurs. -
FIG. 8B shows a variation waveform of the crank angular speed in the case where the engine rotational speed Ne increases. In this case, the regular variation amount Δω of the crank angular speed should be measured in the direction orthogonal to the straight line representing the engine rotational speed Ne, but actually a variation amount Δω′ in the direction parallel to the vertical axis is measured, so that the variation amount Δω′ becomes smaller than the regular variation amount Δω. Accordingly, an error disadvantageously occurs when the vibration state of the engine is estimated based on the variation amount Δω′ in the direction parallel to the vertical axis. This problem also occurs in the case where the engine rotational speed Ne decreases. - The present invention has been achieved under the above-mentioned circumstances, and has an object to accurately estimate a vibration state of an engine when an engine rotational speed increases and decreases, thereby precisely controlling an active vibration isolation support system.
- In order to achieve the above-described object, according to a first feature of the present invention, there is provided an actuator drive control device for an active vibration isolation support system, comprising a control apparatus which controls an operation of an actuator based on a vibration state of an engine which is estimated from a rotational variation of a crankshaft, so as to suppress transmission of a vibration of the engine, wherein the control apparatus calculates accumulated time of time intervals of crank pulse outputted at each predetermined crank angle for one period of engine vibration; calculates average accumulated time averaged for the one period of engine vibration; and controls the actuator of the active vibration isolation support system based on the vibration state of the engine which is estimated from a variation waveform of deviation obtained by subtracting the average accumulated time from the accumulated time at each predetermined crank angle.
- According to a second feature of the present invention, in addition to the first feature, the control apparatus calculates the average accumulated time based on the accumulated time over the one period of engine vibration.
- According to a third feature of the present invention, in addition to the first or second feature, the control apparatus calculates torque around the crankshaft based on the deviation at each predetermined crank angle, and estimates the vibration state of the engine based on a difference between the maximum torque value and the minimum torque value which are adjacent in time.
- In order to achieve the above-described object, according to a fourth feature of the present invention, there is provided an actuator drive control method for an active vibration isolation support system, for controlling an operation of an actuator based on a vibration state of an engine which is estimated from a rotational variation of a crankshaft in order to suppress transmission of engine vibration, the method comprising: a first step of calculating accumulated time of time intervals of crank pulse outputted at each predetermined crank angle for one period of engine vibration; a second step of calculating average accumulated time averaged for the one period of engine vibration; a third step of calculating deviation obtained by subtracting the average accumulated time from the accumulated time at each predetermined crank angle; a fourth step of estimating the vibration state of the engine from a variation waveform of the deviation; a fifth step of controlling the actuator of the active vibration isolation support system based on the vibration state of the engine.
- According to a fifth feature of the present invention, in addition to the fourth feature, the second step calculates the average accumulated time based on the accumulated time over the one period of engine vibration.
- According to a sixth feature of the present invention, in addition to the fourth or fifth feature, the fourth step calculates torque around the crankshaft based on the deviation at each predetermined crank angle, and estimates the vibration state of the engine based on a difference between the maximum torque value and the minimum torque value which are adjacent in time.
- With the first, second, fourth and fifth features, it is possible to obtain the variation waveform of the crank pulses in the time intervals which is attributable to only the engine vibration, by subtracting the average accumulated time from the accumulated time at each predetermined crank angle to eliminate the influence of the variation in the engine rotational speed; and estimate the vibration state of the engine from the thus-obtained variation waveform. Therefore, the engine vibration is appropriately estimated, and the actuator of the active vibration isolation support system is precisely controlled to allow the active vibration isolation support system to effectively exert its vibration isolation function.
- With the third and sixth features, the influence of the variation in the angular speed of the crankshaft attributable to the increase and decrease of the engine rotational speed is properly eliminated, thus precisely estimating the actual vibration state of the engine.
- The electronic control unit U in the embodiment corresponds to the control apparatus of the present invention.
-
FIG. 1 is a vertical sectional view of an active vibration isolation support system according to an illustrative embodiment of the present invention. -
FIG. 2 is a sectional view taken along the line 2-2 inFIG. 1 . -
FIG. 3 is a sectional view taken along the line 3-3 inFIG. 1 . -
FIG. 4 is an enlarged view of an essential part ofFIG. 1 . -
FIG. 5 is a flow chart explaining an operation of an embodiment. -
FIG. 6 is a diagram explaining step S5 of the flow chart inFIG. 5 . -
FIG. 7 is a diagram explaining the relationship between the time interval of the crank pulses and the vibration period. -
FIGS. 8A and 8B are diagrams explaining a conventional method for obtaining the crank angular acceleration. - One exemplary illustrative embodiment of the present invention will be described with reference to the accompanying drawings.
- An active vibration isolation support system M shown in
FIG. 1 toFIG. 4 elastically supports an engine E (V-type four-cycle six-cylinder engine in this embodiment) of an automobile in a vehicle body frame F. The system is controlled by an electronic control unit U to which a crank pulse sensor Sa is connected for detecting crank pulses that are outputted accompanying rotation of a crankshaft of the engine E. Twenty-four crank pulses are outputted per rotation of the crankshaft, that is, one crank pulse is outputted for every 15 degrees of crank angle. - The active vibration isolation support system M has a structure that is substantially symmetrical with respect to an axis L. The system M includes an
inner tube 12 that is welded to a plate-shaped mounting bracket 11 that is joined to the engine E, and anouter tube 13 that is placed coaxially on an outer periphery of theinner tube 12. Theinner tube 12 and theouter tube 13 are bonded by vulcanization bonding to an upper end and a lower end, respectively, of a firstelastic body 14 made of thick rubber. A disc-shaped first orifice-formingmember 15 having anaperture 15 b in its center, an annular second orifice-formingmember 16 having a dipper-shaped section open at the top, and an annular third orifice-formingmember 17 similarly having a dipper-shaped section open at the top are welded together into a single unit. The outer peripheries of the first orifice-formingmember 15 and the second orifice-formingmember 16 are superimposed and fixed to a crimpingfixing part 13 a provided in a lower part of theouter tube 13. - The outer periphery of a second
elastic body 18 made of a rubber membrane is fixed by vulcanization bonding to the inner periphery of the third orifice-formingmember 17. Anouter cap member 19, fixed by vulcanization bonding to the inner periphery of the secondelastic body 18, is fixed by press fitting onto amovable member 20 disposed on the axis L to be vertically movable. The outer periphery of adiaphragm 22 is fixed by vulcanization bonding to aring member 21 that is fixed to the crimpingfixing part 13 a of theouter tube 13. Aninner cap member 23, fixed by vulcanization bonding to the inner periphery of thediaphragm 22, is fixed onto themovable member 20 by press fitting. Theinner cap member 23 fits closely inside theouter cap member 19. - A first
liquid chamber 24, which is charged with a liquid, is thus defined between the firstelastic body 14 and the secondelastic body 18, and a secondliquid chamber 25, which is charged with a liquid, is thus defined between the secondelastic body 18 and thediaphragm 22. The firstliquid chamber 24 and the secondliquid chamber 25 communicates with each other via anupper orifice 26 and alower orifice 27 which are formed by the first to third orifice-formingmembers - The
upper orifice 26 is an annular passage formed between the first orifice-formingmember 15 and the second orifice-formingmember 16. A communicatinghole 15 a is formed in the first orifice-formingmember 15 on one side of apartition wall 26 a provided in a part of theupper orifice 26, and a communicatinghole 16 a is formed in the second orifice-formingmember 16 on the other side of thepartition wall 26 a. Therefore, theupper orifice 26 is formed over substantially one round from the communicatinghole 15 a of the first orifice-formingmember 15 to the communicatinghole 16 a of the second orifice-forming member 16 (seeFIG. 2 ). - A
lower orifice 27 is an annular passage formed between the second orifice-formingmember 16 and the third orifice-formingmember 17. The communicatinghole 16 a is formed in the second orifice-formingmember 16 on one side of apartition wall 27 a provided in a part of thelower orifice 27, and a communicatinghole 17 a is formed in the third orifice-formingmember 17 on the other side of thepartition wall 27 a. Therefore, thelower orifice 27 is formed over substantially one round from the communicatinghole 16 a of the second orifice-formingmember 16 to the communicatinghole 17 a of the third orifice-forming member 17 (seeFIG. 3 ). - As a result of the above description, the first
liquid chamber 24 and the secondliquid chamber 25 communicate with each other via theupper orifice 26 and thelower orifice 27 which are connected to each other in series. - An
annular mounting bracket 28 for fixing the active vibration isolation support system M to the vehicle body frame F is fixed to the crimpingfixing part 13 a of theouter tube 13, and anactuator housing 30 constructing an outer shell of anactuator 29 for driving themovable member 20 is welded to a lower surface of themounting bracket 28. - A
yoke 32 is fixed to theactuator housing 30, and acoil 34, wound around abobbin 33, is housed in a space surrounded by theactuator housing 30 and theyoke 32. A bottomedcylindrical bearing 36 is fitted in atubular part 32 a of theyoke 32 fitted in an inner periphery of theannular coil 34. A disc-shaped armature 38 facing an upper surface of thecoil 34 is slidably supported on an inner peripheral surface of theactuator housing 30. Astep part 38 a formed on an inner periphery of thearmature 38 engages with an upper part of thebearing 36. Thearmature 38 is biased upward by adisc spring 42 that is disposed between thearmature 38 and an upper surface of thebobbin 33, and is positioned by engagement with a retainingpart 30 a provided on theactuator housing 30. - A
cylindrical slider 43 is slidably fitted in the inner periphery of thebearing 36, and ashaft part 20 a extending downward from themovable member 20 loosely penetrates through an upper base part of thebearing 36 to be connected to aboss 44 that is fixed to an interior of theslider 43. Acoil spring 41 is disposed between the upper base part of thebearing 36 and theslider 41. Thebearing 36 is biased upward by thiscoil spring 41, and theslider 43 is biased downward by thecoil spring 41. - When the
coil 34 of theactuator 29 is in a demagnetized state, an elastic force of thecoil spring 41 acts downward on theslider 43 slidably supported in thebearing 36, and an elastic force of acoil spring 45 disposed between theslider 43 and a base surface of theyoke 32 acts upward, so that theslider 43 stops at a position where the elastic forces of both the coil springs 41 and 45 are in balance. When thecoil 34 is excited in this state so as to draw thearmature 38 downward, thestep part 38 a pushes the bearing 36 to slide it downward, thereby compressing thecoil spring 41. As a result, the elastic force of thecoil spring 41 increases, thereby lowering theslider 43 while compressing thecoil spring 45, themovable member 20 that is connected to theslider 43 via theboss 44 and theshaft part 20 a descends, and the secondelastic body 18 connected to themovable member 20 deforms downward, thus increasing the capacity of the firstliquid chamber 24. Conversely, when thecoil 34 is demagnetized, themovable member 20 rises, the secondelastic body 18 deforms upward, and the capacity of the firstliquid chamber 24 decreases. - When a low-frequency engine-shake vibration occurs while the automobile is traveling, if a load inputted from the engine E deforms the first
elastic body 14, thus changing the capacity of the firstliquid chamber 24, the liquid travels between the firstliquid chamber 24 and the secondliquid chamber 25, which are connected via theupper orifice 26 and thelower orifice 27. When the capacity of the firstliquid chamber 24 increases and decreases, the capacity of the secondliquid chamber 25 decreases and increases accordingly, and this change in the capacity of the secondliquid chamber 25 is absorbed by the elastic deformation of thediaphragm 22. Since the shapes and dimensions of theupper orifice 26 and thelower orifice 27 and the spring constant of the firstelastic body 14 are set so that a high spring constant and a high attenuation force can be obtained in a region of the frequency of engine shake vibration, the vibration that is transmitted from the engine E to the vehicle body frame F can be reduced effectively. - In this frequency region of the engine shake vibration, the
actuator 29 is maintained in a non-operational state. - If vibration having a frequency higher than that of the engine shake vibration, namely, idling vibration or muffled sound vibration due to the rotation a crankshaft of the engine E occurs, the liquid within the
upper orifice 26 and thelower orifice 27 which connect the firstliquid chamber 24 and the secondliquid chamber 25 is brought into a stick state and cannot exhibit the vibration isolation function, and therefore theactuator 29 is operated so as to exhibit the vibration isolation function. - Next, the details of the control of the
actuator 29 of the active vibration isolation support system M will be described with reference to the flow chart inFIG. 5 and the time chart inFIG. 6 . - First, in step S1, a crank angle of a vibration period of an engine E is determined. In the four-cycle six-cylinder engine E in the embodiment, six explosions occur while the crankshaft makes two rotations, and therefore the crank angle of the vibration period is 120 degrees. In this vibration period, eight crank pulses are outputted at every 15 degrees of the crank angle. When the cylinders on one side of the V-type engine E of this embodiment are inactivated, three explosions occur while the crankshaft makes two rotations, and therefore the crank angle of this vibration period is 240 degrees, during which period, 16 crank pulses are outputted.
- In the subsequent step S2, eight crank pulses in a vibration period T are read, and the time intervals of the crank pulses are calculated. As shown in
FIG. 7 , eight crank pulses are outputted during the vibration period T, and the time intervals tn (t1, t2, t3 . . . t8) vary according to the variation in the angular speed of the crankshaft. - Namely, in the explosion stroke of the engine E, the crank angular speed ω increases and the time interval tn becomes short, in the compression stroke of the engine E, the crank angular speed ω decreases and the time interval tn becomes long, but in the other strokes in which the engine rotational speed Ne increases, the time interval tn becomes short due to an increase in the crank angular speed ω, and in the other strokes in which the engine rotational speed Ne decrease, the time interval tn becomes long due to a decrease in the crank angular speed ω. Accordingly, the time interval tn of the crank pulses as shown in
FIG. 6 includes a factor attributable to a variation in the crank angular speed ω accompanying the vibration in each vibration period T of the engine E, and a factor attributable to a variation in the crank angular speed ω accompanying an increase and decrease of the engine rotational speed Ne. - Among the above-described two factors, it is the former factor (variation in the crank angular speed ω accompanying the vibration) that has an influence on the control of the active vibration isolation support system M, and thus it is necessary to eliminate the latter factor (variation in the crank angular speed ω accompanying the increase and decrease of the engine rotational speed Ne) which does not have an influence on the control of the active vibration isolation support system M.
- Accumulated time Σtn=t1+t2+t3+ . . . +t8 of eight time intervals tn of the crank pulses is calculated in the subsequent step S3. The accumulated time Σtn corresponds to the vibration period T.
- In the subsequent step S4, the average accumulated time of the eight time intervals tn is calculated. As is obvious from
FIG. 6 , the line of the accumulated time is curved in the shape of S, but the line of the average accumulated time is the straight line connecting the starting point and the end point of the line of the accumulated time. Namely, the average accumulated time corresponds to the accumulated time in the case where the crank angular speed ω is constant, and the value of the average accumulated time increases by T/8 each time the crank angle increases by 15 degrees. - In the subsequent step S5, eight deviations Δt1, Δt2, Δt3, . . . , Δt8 are calculated by subtracting the average accumulated time from the accumulated time at each position at every 15 degrees of the crank angle. The line curved in the shape of S at the lower side in
FIG. 6 represents a deviation Δtn, and this line corresponds to a variation waveform of the time interval tn of the crank pulses from which the influence of the variation in the engine rotational speed Ne is eliminated, namely, the deviation with respect to the time interval tn of the crank pulses in the case where the crank angular speed ω is constant. - When it is assumed that the engine vibration does not exist, if the engine speed Ne is constant, the accumulated time of the time interval tn increases linearly as in the case of the average accumulated time, but when the engine rotational speed Ne increases and decreases, the accumulated time of the time interval tn deviates from the linear average accumulated time. However, in this embodiment, by using the linear average accumulated time obtained by averaging the engine rotational speed Ne, which actually varies, as the reference, the deviation Δtn from the average accumulated time is calculated, whereby the influence of the variation in the engine rotational speed Ne is eliminated, thus obtaining the deviation Δtn attributable to only the vibration of the engine E. This is nothing but obtaining the deviation of the actual angular speed with respect to the average angular speed of the crankshaft.
- In the subsequent step S6, the crank angular speed ω at every 15 degrees of the crank angle is calculated based on the deviation Δtn. Namely, if the crank angular speed ω is a constant value, each of the crank angular speeds ω is the result of dividing the crank angle of 15 degrees by ⅛ of the vibration period T, but actually the crank angular speed ω is given by
15°÷(T/8+Δtn)
due to the existence of the deviation Δtn. - In the subsequent step S7, the crank angular acceleration dω/dt is calculated by differentiating the crank angular speed ω with respect to time, and further in step S8, the torque Tq around the crankshaft of the engine E is calculated by
Tq=I×dω/dt
where I denotes the moment of inertia around the crankshaft of the engine E. In step S9, the maximum torque value and the minimum torque value that are adjacent in time are determined, and the vibration state (amplitude) of the engine E is calculated as a difference between the maximum value and the minimum value of the torque, namely, the amount of change in torque. - The vibration state of the engine E thus calculated is highly precise because the influence of increase and decrease of the engine rotational speed Ne is eliminated. Therefore, the
actuator 29 of the active vibration isolation support system M is precisely controlled, thus enhancing the vibration isolation function. - The embodiment of the present invention has been described in detail above, but the present invention can be modified in design in a variety of ways without departing from the subject matter of the invention.
- For example, the active vibration isolation support system M is not limited to the one charged with a liquid, but may be the one using a piezo element.
- In the embodiment, the active vibration isolation support system M for supporting the engine E of an automobile is shown as an example, but the active vibration isolation support system M of the present invention is applicable to support for any engine not for an automobile.
- Further, in the embodiment, the accumulated time of eight time intervals tn of the crank pulse is calculated, that is, accumulated time Σtn=t1+t2+t3+ . . . +t8, and the accumulated time Σtn is shown in
FIG. 6 as the terminal point of the line of the accumulated time. However, the accumulated time Σtn may be calculated from the rotational speed of the engine without accumulating the time intervals tn. Specifically, since the accumulated time Σtn corresponds to a crank angle of 120° in the six-cylinder engine of the embodiment, the accumulated time Σtn may be calculated as time required for a crank angle of 120° from the engine rotational speed. - Furthermore, since the time interval tn of the crank pulse after eliminating the influence of the variation in the engine rotational speed Ne is in proportion to an amount of the torque variation, the amount of the torque variation can be calculated by multiplying the time interval tn by a predetermined coefficient. Therefore, the torque maximum value and the torque minimum value in step 9 can be easily calculated from the amount of the torque variation.
Claims (6)
1. An actuator drive control device for an active vibration isolation support system, comprising a control apparatus which controls an operation of an actuator based on a vibration state of an engine which is estimated from a rotational variation of a crankshaft, so as to suppress transmission of a vibration of the engine,
wherein the control apparatus calculates accumulated time of time intervals of crank pulses outputted at each predetermined crank angle for one period of engine vibration; calculates average accumulated time averaged for the one period of engine vibration; and controls the actuator of the active vibration isolation support system based on the vibration state of the engine which is estimated from a variation waveform of deviation obtained by subtracting the average accumulated time from the accumulated time at each predetermined crank angle.
2. The actuator drive control device for the active vibration isolation support system according to claim 1 , wherein the control apparatus calculates the average accumulated time based on the accumulated time over the one period of engine vibration.
3. The actuator drive control device for the active vibration isolation support system according to claim 1 or 2 , wherein the control apparatus calculates torque around the crankshaft based on the deviation at each predetermined crank angle, and estimates the vibration state of the engine based on a difference between a maximum torque value and a minimum torque value which are adjacent in time.
4. An actuator drive control method for an active vibration isolation support system, for controlling an operation of an actuator based on a vibration state of an engine which is estimated from a rotational variation of a crankshaft in order to suppress transmission of engine vibration, the method comprising:
a first step of calculating accumulated time of time intervals of crank pulses outputted at each predetermined crank angle for one period of engine vibration;
a second step of calculating average accumulated time averaged for the one period of engine vibration;
a third step of calculating deviation obtained by subtracting the average accumulated time from the accumulated time at each predetermined crank angle;
a fourth step of estimating the vibration state of the engine from a variation waveform of the deviation; and
a fifth step of controlling the actuator of the active vibration isolation support system based on the vibration state of the engine.
5. The actuator drive control method for an active vibration isolation support system according to claim 4 , wherein the second step involves calculation of the average accumulated time based on the accumulated time over the one period of engine vibration.
6. The actuator drive control method for an active vibration isolation support system according to claim 4 or 5 , wherein the fourth step involves calculation of torque around the crankshaft based on the deviation at each predetermined crank angle, and estimation of the vibration state of the engine based on a difference between the maximum torque value and the minimum torque value which are adjacent in time.
Priority Applications (1)
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US11/362,356 US20060192329A1 (en) | 2003-06-13 | 2006-02-24 | Actuator drive control device for active vibration isolation support system, and actuator drive control method for the same |
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JP2003-169562 | 2003-06-13 | ||
JP2003169562A JP3811469B2 (en) | 2003-06-13 | 2003-06-13 | Actuator drive controller for active anti-vibration support device |
US10/862,822 US7025342B2 (en) | 2003-06-13 | 2004-06-07 | Actuator drive control device for active vibration isolation support system, and method of using same |
US11/362,356 US20060192329A1 (en) | 2003-06-13 | 2006-02-24 | Actuator drive control device for active vibration isolation support system, and actuator drive control method for the same |
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US10/862,822 Continuation-In-Part US7025342B2 (en) | 2003-06-13 | 2004-06-07 | Actuator drive control device for active vibration isolation support system, and method of using same |
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US20060192329A1 true US20060192329A1 (en) | 2006-08-31 |
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US10/862,822 Active US7025342B2 (en) | 2003-06-13 | 2004-06-07 | Actuator drive control device for active vibration isolation support system, and method of using same |
US11/362,356 Abandoned US20060192329A1 (en) | 2003-06-13 | 2006-02-24 | Actuator drive control device for active vibration isolation support system, and actuator drive control method for the same |
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US10/862,822 Active US7025342B2 (en) | 2003-06-13 | 2004-06-07 | Actuator drive control device for active vibration isolation support system, and method of using same |
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US20090224446A1 (en) * | 2008-03-07 | 2009-09-10 | Honda Motor Co., Ltd. | Active vibration isolating support apparatus |
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US7891332B2 (en) * | 2006-09-27 | 2011-02-22 | GM Global Technology Operations LLC | Method and apparatus for generating crankshaft synchronized sine wave |
JP4243290B2 (en) * | 2006-11-21 | 2009-03-25 | 本田技研工業株式会社 | Active anti-vibration support device |
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US8444124B2 (en) | 2007-08-15 | 2013-05-21 | Honda Motor Co., Ltd. | Engine natural vibration frequency detection method, active vibration isolation support device control method, engine natural vibration frequency detection apparatus, active vibration isolation support device control apparatus, active vibration isolation support device, and vibration frequency detection apparatus for vibrating body |
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Also Published As
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JP3811469B2 (en) | 2006-08-23 |
US7025342B2 (en) | 2006-04-11 |
US20050017420A1 (en) | 2005-01-27 |
JP2005003156A (en) | 2005-01-06 |
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