# US 10,480,367 B2 · Hydraulic circuit system for forced regeneration of diesel particulate filter

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- Number: US 10,480,367 B2
- Document ID: US10480367B2
- Status: Granted
- Kind: B2
- Application number: 14/655,914
- Filed: 2013-12-03
- Published: 2015-11-26
- Granted: 2019-11-19
- Earliest claimed: 2012-12-26
- Assignees: Doosan Infracore Co., Ltd.
- Applicants: Doosan Infracore Co., Ltd.
- Inventors: Myoung Jin Seok; Sung Hoon Lee
- Web page: https://patentgrep.com/patent/US10480367B2

## CPC

- F01N 3/0821: {combined with particulate filter}
- E02F 9/2066: {of the type combustion engines}
- E02F 9/2235: {including an electronic controller}
- E02F 9/226: {Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating}
- E02F 9/2282: {Systems using center bypass type changeover valves}
- E02F 9/2296: {Systems with a variable displacement pump}
- F02D 29/04: peculiar to engines driving pumps
- F04C 2/12: of other than internal-axis type
- F04C 13/005: {Removing contaminants, deposits or scale from the pump; Cleaning}
- F04C 14/24: characterised by using valves controlling pressure or flow rate, e.g. discharge valves {or unloading valves}(F04C14/10 takes precedence)
- F04C 15/008: {Prime movers}
- F04C 15/06: Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F01N 9/002: {of filter regeneration}
- F15B 2211/20523: Internal combustion engine
- F15B 2211/20546: variable capacity
- F15B 2211/275: Control of the prime mover, e.g. hydraulic control
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR

## Abstract

The present disclosure relates to a hydraulic circuit system for forced regeneration of a diesel particulate filter, and more particularly, to a hydraulic circuit system for forced regeneration of a diesel particulate filter (DPF), which prevents a working machine from being operated when the diesel particulate filter is forcedly regenerated by combusting particulate matters (PM) in a case in which the diesel particulate filter is installed in a construction machine with a diesel engine and particulate matters contained in exhaust gas are collected in the diesel particulate filter.

## Claims

### Claim 1

A hydraulic circuit system for forced regeneration of a diesel particulate filter, the hydraulic circuit system comprising:
an engine configured to generate power;
a diesel particulate filter provided in a path through which exhaust gas is discharged from the engine, and configured to purify the exhaust gas from the engine;
a hydraulic pump connected to the engine, and configured to discharge hydraulic oil using the power of the engine;
a main control valve including a spool, the main control valve is directly connected to the hydraulic pump via a hydraulic oil conduit and provided between the hydraulic pump and an actuator of a working machine, wherein the main control valve is configured to provide the hydraulic oil to the actuator of the working machine;
a regulator connected to the hydraulic pump, and configured to adjust an angle of a swash plate of the hydraulic pump based on an intensity of discharge pressure of the hydraulic oil from the hydraulic pump in order to control a discharge flow rate of the hydraulic oil from the hydraulic pump;
a hydraulic line directly connected to the hydraulic oil conduit and configured to provide the discharge pressure of the hydraulic oil from the hydraulic pump to the regulator; and
a forced regeneration valve provided in the hydraulic line, and configured to block, in a forced regeneration mode, the discharge pressure of the hydraulic oil provided to the regulator so that the discharge flow rate of the hydraulic oil from the hydraulic pump becomes the maximum.

### Claim 2 (depends on 1)

The hydraulic circuit system of claim 1, further comprising:
a drain tank which stores the hydraulic oil,
wherein in a normal mode, the forced regeneration valve blocks the discharge pressure of the hydraulic oil from being provided to the regulator and in the forced regeneration mode, the forced regeneration valve is operated to connect the drain tank and the regulator, when the diesel particulate filter is in the forced regeneration mode.

### Claim 3 (depends on 1)

The hydraulic circuit system of claim 1, further comprising:
a gear pump which discharges pilot hydraulic oil,
wherein in a normal mode, the forced regeneration valve blocks the discharge pressure of the hydraulic oil from being provided to the regulator and in the forced regeneration mode, the forced regeneration valve is operated to provide the pilot hydraulic oil discharged from the gear pump to the regulator, when the diesel particulate filter is in the forced regeneration mode.

### Claim 4 (depends on 1)

The hydraulic circuit system of claim 1, wherein the hydraulic pump is not allocated to a bucket cylinder.