JPH0241052Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a roll stopper control device that drives a roll stopper that prevents rolling of the engine for a certain period of time depending on the accelerator opening/closing speed.

When the engine installed in a car is suddenly depressed or released from the accelerator, the load condition acting on the engine changes rapidly, and the engine tends to roll. It is necessary to suppress this behavior by strongly regulating the engine movement, but if the engine movement is strongly restricted all the time, engine vibrations will be transmitted to the vehicle body when the engine is idling, causing discomfort to the occupants. occurs. The roll stopper is activated only when excessive rolling occurs to strongly restrict engine movement. Generally, a roll stopper is made of an elastic body filled with fluid such as oil, and the flow of the fluid is controlled by opening and closing a solenoid valve to control the damping characteristics as a whole.
There was a problem in which an abnormal noise was emitted during the transition period of valve movement due to ON/OFF control.

This idea was made in view of the above points,
Its purpose is to be interposed between the engine and the car body, and to communicate with each other through a communication passage, so that the capacity changes as fluid flows through the communication passage according to the relative displacement between the engine and the car body. and a valve body provided in the communication passage, and when the valve body moves in a direction to close the communication passage, the flow of the fluid through the communication passage is suppressed. In the roll stopper whose relative displacement with the vehicle body is regulated, a solenoid that engages the valve body and moves the valve body in a direction to close the communication passage when excited, and a solenoid that moves the valve body in the direction of closing the communication passage when the accelerator is actuated, and a first an accelerator speed detection means that outputs a drive signal when detecting that the speed in the accelerator closing direction is at least a second predetermined value that is larger than the first predetermined value; , a first timer circuit that receives the drive signal and supplies a predetermined excitation current to the solenoid for a first set time; and a current whose average current amount is smaller than the predetermined excitation current following the operation of the first timer circuit. It is an object of the present invention to provide a roll stopper control device characterized in that it is equipped with a solenoid drive circuit having a second timer circuit that supplies a roll stopper for a second set time.

An embodiment of this invention will be described below with reference to the drawings. Figure 1 explains where the engine is loaded in a FF vehicle. In Figure 1,
11 is an engine, and 12 is a transmission installed on the side of the engine 11. The transmission 12 is mounted on a vehicle body 14 by a transmission mount 13. Further, the engine 11 is mounted on the vehicle body 14 by a left mount 15. Therefore, the mission mount 13
and the engine 1 by the left mount 15.
1 and a transmission 12 installed on the side thereof are placed on the vehicle body 14. Further, a front roll stopper 16 is provided on the front surface of the engine 11, and a rear roll stopper 17 is provided on the rear surface. The front roll stopper 16 and the rear roll stopper 17 have a damper function to alleviate the rolling motion of the engine 11, and the performance of the damper function can be electrically controlled. Here, FIG. 2 is a side view showing the positional relationship between the front roll stopper 16 and the rear roll stopper 17.

Next, the basic principles of the front roll stopper 16 and the rear roll stopper 17 will be explained using FIG. In FIG. 3, the roll stopper is made of casings 3 and 4 made of an elastic material such as rubber.
and chamber A and chamber B as fluid chambers formed in the casings 3 and 4 and filled with oil, respectively.
and a separation member 21 provided between these chambers A and B. This separation member 21
Two through holes are formed in the chamber A and B to form a communication path, one of which is called a first orifice 22 and the other a second orifice 23. Here, the first orifice 2
The inner diameter of the second orifice 23 is considerably larger than that of the second orifice 23. and the above first orifice 2
A rotary valve 24 as a valve body is provided in the interior of the rotary valve 2, and a solenoid 40 of a solenoid valve (not shown) is installed inside the rotary valve 24 as a valve body.
As a result, the rotary valve 24 is rotated through 90 degrees, and the opening and closing of the first orifice 22 is controlled. Incidentally, the casings 3 and 4 are integrally connected by a connecting member 5, and a bracket 6 connected to the engine 11 is attached to the connecting member 5. On the other hand, a bracket 7 fixed to the vehicle body is connected to one end of the separation member 21.

Therefore, when the connecting member 5 vibrates in the direction of arrow D due to the rolling motion of the engine 11, this vibration is attenuated by the orifices 22 and 23, and is transmitted to the separating member 21 as a minute vibration in the direction of arrow C. It is becoming. In this case, if the rotary valve 24 is rotated to close the first orifice 23 (hard state), the oil in the chambers A and B will flow only through the second orifice 23. As the amount of oil passing between chambers A and B becomes smaller, the pressure difference between chambers A and B becomes larger (a state where the damping force is large), and the amount of engine vibration transmitted to the vehicle body increases, but the rolling motion of the engine 11 is It can be suppressed effectively. On the other hand, when the first orifice 22 is opened due to the rotation of the rotary valve 24 (soft state), the oil in the chambers A and B flows through the first orifice 22 and the second orifice 23. Room A and Room B
The amount of oil passing between chambers A and B increases.
The pressure difference between the two is small (damping force is small),
Although the function of preventing rolling of the engine 11 is reduced, the amount of engine vibration transmitted to the vehicle body is reduced.

FIG. 4 shows the roll stopper control device. In the figure, 31 is an accelerator opening sensor that detects the amount of depression of the accelerator. Contact A of this accelerator opening sensor 31 moves up and down in response to depression or release of the accelerator, and when the accelerator is depressed, contact A moves in the direction of arrow B. The voltage generated at the contact A is input to the accelerator speed detection circuit 32. This accelerator speed detection circuit 32 uses, for example, the amount of change in the opening direction of the input accelerator opening as a first predetermined value.
0.5m/s or more, or the amount of change in the accelerator opening in the closing direction is, for example, 0.8m/s as the second predetermined value.
If this is the case, an H level signal is output. That is, the voltage generated at the contact A is input to the + terminal of the differential amplifier 34 via an integrating circuit 33 consisting of a resistor R1 and a capacitor C1. A resistor R2 whose one end is grounded is connected to the output of the differential amplifier 34. In addition, D1, D
2 are diodes. The voltage generated across the resistor R2 is input to one terminal of the differential amplifier 34. Furthermore, the differential amplifier 34
The output is from resistors R5 and R6 of voltage dividing resistors R4 to R7 connected in series via capacitor C2 and resistor R3.
is connected to connection point B of Further, the voltage at the connection point C between the capacitor C2 and the resistor R3 is the +
These signals are each input to one terminal of a second comparator 36 that compares the accelerator speed in the terminal and closing directions. Further, the voltage at the connection point D between the resistors R6 and R7 is input to one terminal of the first comparator 35, and the voltage at the connection point E between the resistors R4 and R5 is input to the + terminal of the second comparator 36. Furthermore, the above first
The outputs of the second comparators 35 and 36 are input to the base of the transistor _Q1 . The emitter of this transistor _Q1 is grounded.

Incidentally, the collector output of the transistor _Q1 is input to a timer circuit 37 as a first timer circuit. When the timer circuit 37 receives the H level signal, it outputs the H level signal for _T1 time as the first set time. The output of the timer circuit 37 is inputted via an OR circuit 38 to a solenoid drive circuit 39 consisting of power transistors Q ₁ and Q ₂ . The collector side of the transistor _Q2 is connected to a solenoid 40 that hardens the front roll stopper 16 and the rear roll stopper 17.

Thus, the output of the timer circuit 37 is input to a timer circuit 41 as a second timer circuit. When the timer circuit 41 receives the H level signal, it outputs the H level signal for _T2 time as the second set time. Here, T ₂ > T ₁ is set. The output of the timer circuit 41 is input to one input terminal of an AND circuit 42. A pulse signal from an oscillator (not shown) is input to the other input terminal of the AND circuit 42. The pulse width of the pulse signal output from this oscillator is set to be much smaller than the pulse width output from the timer circuits 37 and 41. The output of the AND circuit 42 is input to the OR circuit 38.

Next, the operation of this device configured as described above will be explained. Now, the case where the accelerator is suddenly depressed will be explained. In this case, contact A of accelerator opening sensor 31 moves in the direction of arrow B. Therefore, the input voltage at the + terminal of the differential amplifier 34 increases in response to depression of the accelerator. Therefore, the output voltage of the differential amplifier 34 increases. For this reason, the capacitor changes depending on the accelerator pedal speed.
A voltage is generated at C ₂ with the polarity shown. Therefore,
The voltage input to the + terminal of the first comparator 35 decreases in accordance with the speed at which the accelerator is depressed. And the accelerator pedal speed is, for example, 0.5m/s.
If the values of the resistors R4 to R7 are set so that an L level signal is output from the first comparator 35 when the accelerator depression speed is
When the speed exceeds 0.5m/s, the first comparator 35
The output becomes L level. As a result, the output of the accelerator speed detection circuit 32 becomes H level. As a result, the output of the timer circuit 37 remains at the H level for only time _T1 . As a result, the solenoid drive circuit 39
remains active for a certain period of time. For this reason, the solenoid 40 is excited with a predetermined excitation current to operate the roll stopper, and the damper function for the engine is worked hard to effectively prevent excessive rolling of the engine.

By the way, when the output of the timer circuit 37 becomes H level, the timer circuit 4
1 is activated and its output remains at H level for T ₂ hours.
Therefore, the pulse signal output from the oscillator is input to the solenoid drive circuit 39 via the AND circuit 42 and the OR circuit 38. Here, T ₂ >
Since it is set to T ₁ , the above timer circuit 37
The timer circuit 41 outputs an H level signal even after the H level signal has been output for T ₁ hour. Therefore, the solenoid drive circuit 39 and the timer circuit 41
While the level signal is being output, the solenoid turns on and off in synchronization with the pulse signal from the oscillator.During this time, the solenoid is supplied with a current that has an average current smaller than the predetermined excitation current, so when the roll stopper returns to the soft state. It is possible to eliminate shocks caused by sudden displacement of the solenoid and prevent abnormal noises from occurring.

Next, a case where the accelerator is suddenly released will be explained. In this case, the contact point A of the accelerator opening sensor 31 moves in the direction opposite to the arrow B. Therefore, the input voltage at the + terminal of the differential amplifier 34 decreases in response to the release of the accelerator. Therefore, the output voltage of the differential amplifier 34 decreases. Therefore, a voltage with the opposite polarity shown in the figure is generated in the capacitor C2 depending on the speed at which the accelerator is returned. Therefore, the voltage input to one terminal of the second comparator 36 increases in accordance with the return speed of the accelerator. If the values of the resistors R4 to R7 are set so that the second comparator 36 outputs an L level signal when the accelerator return speed exceeds, for example, 0.8 m/s, the accelerator return speed will be 0.8 m/s. /s or more, the output of the second comparator 36 becomes L level. As a result, the output of the accelerator speed detection circuit 32 becomes H level. As a result, the output of the timer circuit 37 is
T Stays at H level for only ₁ hour. The following operation is the same as the operation when the accelerator is suddenly depressed, so it will be omitted here.

As detailed above, according to this invention, when the accelerator is operated in the closing direction, the accelerator speed threshold related to the start timing of roll stopper control can be set independently of the speed threshold in the accelerator opening direction. control starts at an appropriate timing, does not operate the roll stopper unnecessarily, and maintains the roll stopper in a normal state with a sufficiently large damping force over a wide range to sufficiently absorb engine vibrations and transfer them to the vehicle body. This has the effect of sufficiently suppressing the transmission of In addition, when the control of the roll stopper is completed, the valve body moves in the direction of closing the communication passage in order to regulate the relative displacement between the engine and the vehicle body according to the accelerator opening/closing speed, and the fluid flow is suppressed. When the solenoid is switched to the original state after the first set time, a current smaller than the predetermined excitation current is supplied to the solenoid for only the second set time following the first set time, so the solenoid The magnetic force that opposes the urging force that tries to return the solenoid to its original state does not suddenly become zero, but acts with a magnitude that corresponds to the amount of current supplied, causing the solenoid and the valve body engaged with the solenoid to return to their original positions. It is possible to provide a roll stopper control device that eliminates the shock caused by sudden displacement in the return direction and prevents the generation of abnormal noise caused by this shock.

[Brief explanation of drawings]

Figure 1 is a diagram showing the loading location of the engine in a FF vehicle, Figure 2 is a side view of Figure 1, Figure 3 is a diagram showing the basic principle of the roll stopper, and Figure 4 is an example of an embodiment of this invention. It is a figure showing a roll stopper control device. 31... Accelerator opening sensor, 32... Accelerator speed detection circuit, 37, 41... Timer circuit, 3
9... Solenoid drive circuit, 40... Solenoid.

Claims (1)

[Scope of utility model registration request] Two air pumps are interposed between the engine and the vehicle body and communicated with each other through a communication passage, and the capacity changes as fluid flows through the communication passage in accordance with the relative displacement between the engine and the vehicle body. A fluid chamber and a valve body provided in the communication passage are provided, and when the valve body moves in a direction to close the communication passage, the flow of the fluid through the communication passage is suppressed, and the engine and the vehicle body are connected to each other. A roll stopper that regulates the relative displacement of a solenoid that engages with the valve body and moves the valve body in a direction to close the communication passage when excited, and a solenoid whose speed in the accelerator opening direction when the accelerator is actuated has a first predetermined value. an accelerator speed detection means that outputs a drive signal when detecting that the speed in the accelerator closing direction is equal to or higher than a second predetermined value that is larger than the first predetermined value; A first timer circuit that receives a signal and supplies a predetermined excitation current to the solenoid for a first set time, and following the operation of the first timer circuit, a second 1. A roll stopper control device comprising: a solenoid drive circuit having a second timer circuit that supplies power for a set time.