# US 2019/0168785 A1 · Railway vehicle vibration damping device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0168785 A1
- Document ID: US20190168785A1
- Status: Published application
- Kind: A1
- Application number: 16/095,745
- Filed: 2017-04-19
- Published: 2019-06-06
- Earliest claimed: 2016-09-09
- Assignees: KYB Corporation
- Applicants: Kyb Corporation
- Inventors: Takayuki OGAWA
- Web page: https://patentgrep.com/patent/US20190168785A1

## CPC

- B61F 5/245: {by active damping, i.e. with means to vary the damping characteristics in accordance with track or vehicle induced reactions, especially in high speed mode}
- F15B 21/02: Servomotor systems with program control derived from a store or timing device; Control devices therefor
- F16F 9/461: {characterised by actuation means}
- F16F 15/002: {characterised by the control method or circuitry (control of mechanical oscillations per se G05D19/00)}
- F15B 2211/20515: Electric motor
- F15B 2211/3058: having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
- F15B 2211/31558: having a single output member
- F15B 2211/50518: using pressure relief valves
- F15B 2211/6303: using input signals
- F15B 2211/6336: representing a state of the output member, e.g. position, speed or acceleration
- F15B 2211/665: Methods of control using electronic components
- F15B 2211/6651: Control of the prime mover, e.g. control of the output torque or rotational speed
- F15B 2211/755: Control of acceleration or deceleration of the output member
- F15B 2211/76: Control of force or torque of the output member
- F15B 2211/8616: the abnormal condition being noise or vibration
- F16F 9/19: with a single cylinder {and of single-tube type}
- B61F: RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES (for vehicles in general B60; axles or wheels B60B; vehicle tyres B60C)
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION

## Abstract

A railway vehicle vibration damping device includes an actuator interposed between a vehicle body and a truck and capable of exerting a control force; and a controller configured to obtain a target control force for reducing a vibration of the vehicle body based on a lateral acceleration of the vehicle body, and the controller includes a bandpass filter configured to extract a low frequency control force, which is a frequency component lower than a resonant frequency of the vehicle body, and a correcting part configured to correct a target control force based on the low frequency control force.

## Claims

### Claim 1

A railway vehicle vibration damping device comprising:
an actuator interposed between a vehicle body and a truck of a railway vehicle and capable of exerting a control force; and
a controller configured to control the actuator by obtaining a target control force for reducing a vibration of the vehicle body based on a lateral acceleration of the vehicle body,
wherein the controller includes
a filter configured to extract a low frequency control force, the low frequency control force being a frequency component lower than a resonant frequency of the vehicle body in the target control force, and
a correcting part configured to correct the target control force based on the low frequency control force.

### Claim 2 (depends on 1)

The railway vehicle vibration damping device according to claim 1,
wherein the correcting part corrects the target control force downward when the low frequency control force is equal to or larger than a threshold value.

### Claim 3 (depends on 1)

The railway vehicle vibration damping device according to claim 1,
wherein the correcting part corrects the target control force by multiplying the target control force by a correction gain having an upper limit value not larger than 1 when the low frequency control force is equal to or larger than a threshold value.

### Claim 4 (depends on 3)

The railway vehicle vibration damping device according to claim 3,
wherein the correcting part decreases the correction gain little-by-little while the low frequency control force is equal to or larger than the threshold value and increases the correction gain when the low frequency control force is smaller than the threshold value.