JP3236425B2 - Vehicle vibration reduction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reducing vibration of a vehicle caused by rolling of an engine.

[0002]

2. Description of the Related Art As a device for suppressing torque fluctuation of an engine, a configuration in which a rotating machine is provided on an extension of an output shaft of an engine is known. For example, Japanese Unexamined Patent Publication No. Sho 64-66431 discloses a method of detecting a change speed and a change amount of a throttle opening,
A device that controls the output torque of the rotating machine according to a detection result is disclosed. According to this device, the torque fluctuation of the engine can be suppressed by the output torque of the rotating machine configured as a generator / motor.

[0003]

However, when the driver suddenly steps on or releases the accelerator while the vehicle is running, the shaft torque of the engine suddenly rises or falls. The entire engine rotates in the opposite direction (rolling), and the transmission of this vibration causes the vehicle body to vibrate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to suppress the rolling of an engine caused by a sudden depression of an accelerator, thereby reducing the vibration of a vehicle. With the goal.

[0005]

In order to achieve such an object, the present invention provides a method for detecting a state in which an engine is about to start rolling as a result of the accelerator being depressed or released at a speed exceeding a predetermined speed , based on an accelerator signal. Detecting means for detecting a physical quantity indicating a tendency to cause rolling of the engine; and controlling the torque of a rotating machine disposed on an output shaft extension of the engine based on the physical quantity when the state is detected. Means for suppressing rolling of the engine.

[0006]

When the accelerator is depressed or released at a speed higher than a predetermined speed, the engine starts rolling in response to the depression or release. In the present invention, a state in which rolling is about to start due to such a cause is detected based on the accelerator signal . On the other hand, a physical quantity indicating the tendency of the engine to roll (rolling occurrence tendency) is detected. The detected physical quantity is used for torque control of the rotating machine when the above state is detected. This control is performed so that rolling of the engine is suppressed. Therefore, in the present invention, the rolling caused by the sudden depression of the accelerator or the like is suitably suppressed by the torque control of the rotating machine, and the vibration of the vehicle is reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of an apparatus according to an embodiment of the present invention. The device shown in this figure is a driving system of a vehicle, particularly a peripheral configuration of an engine (E / G) 10.

The output shaft of the E / G 10 is connected to a mechanism (not shown) via a transmission (T / M) 12, and the output of the E / G 10 is transmitted to drive wheels via this mechanism to drive the vehicle. Help. Further, a generator / motor (M / G) 14 is disposed on the output shaft extension of the E / G 10, and the M / G 14 suppresses the torque fluctuation of the E / G 10. That is, the torque fluctuation of the E / G 10 can be suppressed by controlling the M / G 14.

The M / G 14 is supplied with power from a battery 18 via an inverter 16. That is, the discharge output of the battery 18 is converted into a three-phase AC by the inverter 16,
This three-phase alternating current is supplied to the M / G 14. Therefore, by supplying a predetermined control signal to the inverter 16, M
/ G14 rotation speed, torque and output can be controlled. This control is executed by the ECU 20. At this time, the ECU 20 inputs an accelerator signal indicating an accelerator operation by the vehicle operator, monitors the number of revolutions of the M / G 14 and the current value output from the inverter 16, and controls the mount of the E / G 10. Enter the deformation direction and deformation amount.

[0011] As shown in this figure, the drive system composed of E / G10, etc. is suspended in the vehicle body by three mouse down bets A, B and C. In particular, the mounts A and B suspend the E / G 10, and their deformation directions and amounts are detected by sensors 22 and 24, respectively.
20. The sensors 22 and 24 can be configured as, for example, an acceleration sensor, a displacement sensor, or the like.

FIG. 2 shows the ECU 20 in this embodiment.
2, in particular, the flow of the rolling suppression control according to the features of the present embodiment.

As shown in FIG. 1, the ECU 20 comprises:
The ignition switch (IG) is turned on (100)
And after the E / G10 is started (102), the vehicle operator by entering the first acceleration signal determines whether depresses the accelerator (104). As a result, when it is determined that the accelerator is depressed, the ECU 20
Whether or not the rolling of the E / G 10 is occurring is detected by the determination (106). That is, E
The CU 20 calculates the differential value of the accelerator pedal depression amount (accelerator depression speed θ) input as an accelerator signal.
·), Executes a determination on displacement m _B of the mount B is detected by the displacement m _A and the sensor 24 of the mount A, which is detected by the sensor 22. In this determination,
_{θ ·> θ 0 ·, |} m A |> m A0 and | m _B |> If any of the m _B0 is satisfied, the operation of the ECU20 Step 1
08, and otherwise returns to step 104. Here, θ ₀ ·, m _A0 and m _B0 are predetermined thresholds.

If the condition for determining the accelerator pedal depression speed θ ^· is satisfied in step 106, it can be considered that the vehicle operator is suddenly stepping on the accelerator or suddenly releasing the accelerator. In other words, it means that the E / G 10 is just about to start rolling due to a sudden accelerator operation. Further, it can be said that when the determination condition for the displacement m each _B displacements m _A and Mount B Mount A is satisfied, E / G10 rolling has already shown that it is started. Therefore, it can be said that the determination in step 106 is a determination for detecting that rolling of the E / G 10 is occurring or has occurred.

[0015] In step 108, the determination of the displacement direction X _B in the displacement direction X _A and Mount B Mount A is executed. In this step, X _A > 0 and X _B <0 are the determination conditions. If this determination condition is not satisfied, the ECU 20 executes step 110. In this step, X _A <0 and X _B > 0 are the determination conditions. Therefore, these steps 108 and 11
By executing 0, the rolling direction of the E / G 10 can be detected.

If the judgment condition of step 108 is satisfied, the ECU 20 executes step 112 and step 110
If the judgment conditions are satisfied, step 114 is executed. In steps 112 and 114,
The torque command T ^* used for controlling the inverter 16 is
It is set using T configured as a function or table.

T used in steps 112 and 114 is, as an example, as shown in FIG. 3, the accelerator depression speed θ ^· , the displacement _{A of} the mount _A , the mount B
Of displacement m _B, the displacement speed m _A ^· Mount A, mount B
A displacement velocity m _B ^· a, and associates the torque to be outputted from the M / G14. However, steps 112 and 11
In FIG. 4, the sign of T is different depending on the rolling direction detected in steps 108 and 110,
The sign of the direction in which the torque related to rolling is suppressed is given. Further, the value of T is a value that substantially cancels the torque related to rolling. The ECU 20 controls the inverter 16 based on the torque command T ^* thus obtained.
To control the output torque of the M / G 14 (116). That is, vector control is performed while monitoring the current of the M / G 14.

Therefore, in this embodiment, when the E / G 10 attempts to roll or starts rolling as a result of the vehicle operator suddenly stepping on or releasing the accelerator, this rolling tendency or the state (degree) thereof.
Is detected, and the torque command T ^* is generated based on the detected physical quantity. Therefore, the rolling of the E / G 10 due to the above-described causes can be suppressed. Therefore, the vibration of the vehicle body due to the rolling of the E / G 10 can be reduced. It is not necessary that T has a content that changes linearly as shown in FIG.

[0019]

As described above, according to the present invention,
Based on the accelerator signal, it detects the prematureness of the rolling of the engine due to sudden depression or release of the accelerator, and based on the physical quantity indicating the tendency of the rolling, the torque of the rotating machine arranged on the extension of the output shaft of the engine. Is controlled, the rolling of the engine accompanying the sudden operation of the accelerator can be suppressed, and the vibration of the vehicle can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of an operation of an ECU in this embodiment.

FIG. 3 is a diagram showing a torque command determination method in this embodiment.

[Explanation of symbols]

10 engine 14 electric generator serves motor 20 ECU 22, 24 sensor A~C mount theta ^· accelerator depression speed m _A mount A displacement m _B Mount B of displacement X _A mount A displacement direction m _A displacement direction X _B mounted B of ^mount torque is generated because of the displacement speed T rolling suppression rate of displacement m _B ^mount B of a T ^* torque command

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02B 75/06 F02D 29/00-29/06 F16F 15/18

Claims (1)

(57) [Claims] 1. Means for detecting , based on an accelerator signal, a state in which an engine is about to start rolling as a result of depression or release of an accelerator at a predetermined speed or more, and means for detecting a physical quantity indicating a tendency of the engine to cause rolling. Means for controlling the torque of a rotating machine disposed on the output shaft extension of the engine based on the physical quantity when the state is detected, thereby suppressing rolling of the engine. Vehicle vibration reduction device.