DE-102022123444-B4 - VEHICLE CONTROL DEVICE AND METHOD FOR NOISE REDUCTION OF A DIFFERENTIAL GEARBOX

Abstract

A control device (410) for a vehicle for reducing noise of a differential gear of a vehicle, wherein the vehicle comprises: a hollow gear (431) toothed with a geared motor (420), a differential housing (432) connected with the hollow gear (431), a differential assembly (430) comprising a differential gear provided inside the differential housing (432), and a separating device (440) connected with at least one gear of the differential gears, wherein the control device (410) for the vehicle comprises: a speed measuring unit (415) for measuring the rotational speed of a vehicle wheel when the vehicle is driven by two wheels, a speed calculation unit (417) for calculating a rotational speed of the hollow gear (431) taking into account the rotational speed of one vehicle wheel, and a drive unit (419) for driving the hollow gear (431) by controlling the geared motor (420) on the basis of the rotational speed of the hollow gear (431).

Inventors

• Youngkyu KIM
• Yeonho Kim
• Jong Bae Ahn

Assignees

• HYUNDAI TRANSYS INC.

Dates

Publication Date

20260513

Application Date

20220914

Priority Date

20210914

Claims (13)

1. A control device (410) for a vehicle for reducing noise of a vehicle differential, wherein the vehicle comprises: a hollow gear (431) toothed with a geared motor (420), a differential housing (432) connected to the hollow gear (431), a differential assembly (430) comprising a differential gear provided inside the differential housing (432), and a separating device (440) connected to at least one gear of the differential gears, wherein the control device (410) for the vehicle comprises: a speed measuring unit (415) for measuring the rotational speed of a vehicle wheel when the vehicle is driven by two wheels, a speed calculation unit (417) for calculating the rotational speed of the hollow gear (431) taking into account the rotational speed of one vehicle wheel, and a drive unit (419) for driving the hollow gear (431) by controlling the geared motor (420). the basis of the rotational speed of the hollow gear (431).
2. The control device (410) for a vehicle according to Claim 1 , further comprising a drive detection unit (413) for determining whether the vehicle is driven by two wheels, wherein the drive detection unit (413) determines that the vehicle is driven by two wheels when the connection between the differential assembly (430) and an auxiliary drive shaft (WS2) of the other vehicle wheel is released according to an actuation of the disconnecting device (440) and a rotation of one vehicle wheel is detected.
3. The control device (410) for a vehicle according to Claim 1 or 2 , further comprising: a transceiver (411) for receiving a rotational speed of one vehicle wheel from a detection device, wherein the rotational speed measuring unit (415) measures the number of revolutions of one vehicle wheel using the received information.
4. The control device (410) for the vehicle according to Claim 3 , wherein the speed calculation unit (417) calculates the number of revolutions of the hollow gear (431) using the number of revolutions of one vehicle wheel.
5. The control device (410) according to Claim 4 , wherein the drive unit controls the gear motor (420) such that the hollow gear (431) rotates at a specified speed, and reduces the number of relative revolutions between a first-side gear (435) of the differential gear connected to one vehicle wheel and a second-side gear (436) of the differential gear connected to the separating device (440) according to the rotary drive of the hollow gear (431).
6. A method for reducing the noise of a vehicle differential, wherein the vehicle comprises: a hollow gear meshed with a geared motor, a differential housing connected to the hollow gear, a differential assembly comprising a differential gear provided inside the differential housing, a separating device connected to at least one gear of the differential gears, and a control device for controlling the geared motor, wherein the method comprises: a wheel speed measurement operation (S520) in which the control device measures the rotational speed of a vehicle wheel when the vehicle is driven by two wheels, a hollow gear speed calculation operation (S530) in which the control device calculates the rotational speed of the hollow gear taking into account the rotational speed of one of the vehicle wheels, and a hollow gear drive operation (S540) in which the control device controls the geared motor on the basis of the calculated rotational speed of the hollow gear in order to drive the hollow gear.
7. The procedure according to Claim 6 , further comprising: a drive determination process (S510) in which the control device determines whether the vehicle is driven by two wheels.
8. The procedure according to Claim 7 , wherein the drive determination process (S510), when the connection between the differential assembly and an auxiliary drive shaft of the other vehicle wheel is released according to the actuation of the disconnecting device and the rotation of one vehicle wheel is detected, includes determining that the vehicle is driven by two wheels.
9. The procedure according to one of the Claims 6 until 8 , wherein the wheel speed measurement process (S520) comprises receiving a rotational speed of one vehicle wheel from a sensing device and measuring the number of revolutions of that one vehicle wheel using the received information.
10. The procedure according to Claim 9 , wherein the hollow gear speed calculation process (S530) involves calculating the number of revolutions of the hollow gear using the number of revolutions of one of the vehicle wheels.
11. The procedure according to one of the Claims 6 until 10 , wherein the hollow gear drive operation (S540) comprises connecting the hollow gear to the differential housing by controlling a separate linking device and controlling the gear motor so that the hollow gear is rotated at a specified speed.
12. The procedure according to Claim 11 , wherein the hollow gear drive operation (S540) comprises a reduction in the number of relative revolutions between a first-side gear of the differential gear connected to one vehicle wheel and a second-side gear of the differential gear connected to the separating device, according to the rotary drive of the hollow gear.
13. The procedure according to one of the Claims 6 until 12 , further comprising: a drive stop operation (S550) wherein, when the vehicle is not operated in two-wheel drive, the control device controls the transmission motor to stop the rotation of the hollow gear.

Description

TECHNICAL AREA The present invention relates to a control device for a vehicle and a method for reducing the noise of a differential gear. RELATED TECHNOLOGY In general, a vehicle can be classified as either a two-wheel drive vehicle or a four-wheel drive vehicle according to a wheel drive method, and a separating device for switching between a two-wheel drive method and a four-wheel drive method is fitted to the vehicle. In general, the disengaging device is a device that is able to minimize unnecessary power losses by engaging the teeth of the sleeve with the teeth of the differential shaft according to the driving situation and switching the procedure to four-wheel drive (4WD) by power linkage, or disengaging the teeth of the sleeve from the teeth of the differential shaft to switch the procedure to two-wheel drive (2WD). One problem, however, is that a differential noise is generated when the drive is switched by the disengaging device. This differential noise can distract the driver and impair safe driving. BRIEF EXPLANATION OF THE INVENTION The present invention was made to provide a control device for a vehicle for reducing differential noise caused by rotation, play and the like of a differential gear during the two-wheel drive of a vehicle, as well as a method for reducing differential noise. An exemplary embodiment of the present invention provides a control device for a vehicle for reducing noise of a vehicle's differential gear, wherein the vehicle comprises: a hollow gear toothed with a geared motor, a differential housing connected to the hollow gear, a differential assembly comprising a differential gear provided inside the differential housing, and a separating device connected to at least one gear below the differential gears, wherein the control device for the vehicle comprises: a speed measuring unit for measuring the rotational speed of a vehicle wheel when the vehicle is driven by two wheels, a speed calculation unit for calculating the rotational speed of the hollow gear taking into account the speed of one of the vehicle wheels, and a drive unit for driving the hollow gear by controlling the geared motor based on the rotational speed of the hollow gear. The control device for the vehicle may further include a drive detection unit to determine whether the vehicle is driven by two wheels, wherein the drive detection unit can determine that the vehicle is driven by two wheels when the connection between the differential assembly and an auxiliary drive shaft of the other vehicle wheel is released according to an actuation of the disconnecting device and a rotation of one vehicle wheel is detected. The vehicle's control device may further include a transceiver for receiving a rotational speed of one of the vehicle's wheels from a sensing device, wherein the speed measuring unit can measure the number of revolutions of one of the vehicle's wheels using the received information. The speed calculation unit can calculate the number of revolutions of the hollow gear based on the number of revolutions of one of the vehicle's wheels. The drive unit can control the geared motor so that the hollow gear rotates at a specific speed, and the number of relative revolutions between a first-side gear of the differential connected to one vehicle wheel and a second-side gear of the differential connected to the other. reduce the differential gear connected to the separating device according to the rotary drive of the hollow gear. Another exemplary embodiment of the present invention provides a method for noise reduction of a vehicle differential gear, wherein the vehicle comprises: a hollow gear toothed with a geared motor, a differential housing connected to the hollow gear, a differential assembly comprising a differential gear provided inside the differential housing, a separating device connected to at least one gear of the differential gears, and a control device for controlling the geared motor, wherein the method comprises: a wheel speed measurement process in which the control device measures a rotational speed of a vehicle wheel when the vehicle is driven by two wheels, a hollow gear speed calculation process in which the control device calculates a rotational speed of the hollow gear taking into account the rotational speed of one of the vehicle wheels, and a hollow gear drive process in which the control device controls the geared motor on the basis of the calculated speed of the hollow gear in order to drive the hollow gear. The procedure may also include a drive determination process in which the control device determines whether the vehicle is driven by two wheels. The drive determination process may include determining that the vehicle is driven by two wheels when the connection between the differential assembly and an auxiliary drive shaft of the other vehicle wheel is released according to the actuation of the disconnecting device and a rotation of one vehicle wheel is detected. The wheel