# US 11,028,746 B2 · Work vehicle including diesel particulate filter (DPF) regeneration control

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- Number: US 11,028,746 B2
- Document ID: US11028746B2
- Status: Granted
- Kind: B2
- Application number: 16/635,486
- Filed: 2018-07-20
- Published: 2021-03-25
- Granted: 2021-06-08
- Earliest claimed: 2017-07-31
- Assignees: Yanmar Power Technology Co., Ltd.
- Applicants: Yanmar Co., Ltd.
- Inventors: Dai Uehara
- Web page: https://patentgrep.com/patent/US11028746B2

## CPC

- F01N 3/023: using means for regenerating the filters, e.g. by burning trapped particles
- B01D 46/84: by heating only
- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01D 53/9431: {Processes characterised by a specific device}
- B01D 53/9477: {with catalysts positioned on separate bricks, e.g. exhaust systems}
- B01D 53/9495: {Controlling the catalytic process}
- F01N 3/025: using fuel burner or by adding fuel to exhaust
- F01N 3/08: for rendering innocuous (using electric or electrostatic separators F01N3/01; chemical aspects B01D53/92)
- F01N 3/0842: {Nitrogen oxides}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 3/208: {Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent}
- F01N 3/24: characterised by constructional aspects of converting apparatus (filtering in combination with catalytic reactors F01N3/035)
- F01N 9/002: {of filter regeneration}
- F02D 45/00: Electrical control not provided for in groups F02D41/00 - F02D43/00
- B01D 2255/1021: Platinum
- B01D 2255/904: Multiple catalysts
- B01D 2255/915: Catalyst supported on particulate filters
- B01D 2279/30: for treatment of exhaust gases from IC Engines
- F01N 3/0253: {adding fuel to exhaust gases}
- F01N 2250/02: filtering and catalytic conversion
- F01N 2430/00: Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N 2430/085: at least a part of the injection taking place during expansion or exhaust stroke
- F01N 2550/02: Catalytic activity of catalytic converters
- F01N 2570/14: Nitrogen oxides
- F01N 2590/08: for heavy duty applications, e.g. trucks, buses, tractors, locomotives
- F01N 2610/02: the substance being ammonia or urea
- F01N 2610/03: the substance being hydrocarbons, e.g. engine fuel
- F01N 2610/1406: Storage means for substances, e.g. tanks or reservoirs
- F01N 2610/146: Control thereof, e.g. control of injectors or injection valves
- F01N 2900/1404: Exhaust gas temperature
- F01N 2900/1606: Particle filter loading or soot amount
- F01N 2900/1621: Catalyst conversion efficiency
- F01N 2900/1814: Tank level
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/40: Engine management systems
- 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)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- 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)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A work vehicle including a DPF system configured to collect particulate matter contained in exhaust gas from an engine; an SCR system configured to add, to the exhaust gas from the engine a reductant stored in a reductant storage tank to reduce nitrogen oxide contained in the exhaust gas; and a control unit capable of executing a DPF renewal control whereby particulate matter collected and deposited in the DPF system is burned and removed by using the exhaust gas from the engine and an SCR reference operation restricting control to restrict an operating condition of the engine. The SCR reference operation restricting control is executed when an amount of the reductant stored in the reductant storage tank is a preset amount or less, or when an abnormality occurs in the SCR system. The control unit preferentially executes the DPF renewal control over the SCR reference operation restricting control.

## Claims

### Claim 1

A work vehicle, comprising:
a diesel particulate filter (DPF) system configured to collect particulate matter contained in exhaust gas from an engine;
a selective catalytic reduction (SCR) system including a reductant stored in a reductant storage tank, the SCR system configured to add the reductant to the exhaust gas so as to reduce nitrogen oxide contained in the exhaust gas; and
a control unit configured to:
execute a DPF renewal control whereby particulate matter collected and deposited in the DPF system is burned and removed using heat from the exhaust gas, and
execute an SCR reference operation restricting control configured to restrict a fuel injection amount of an injector, restrict a rotational speed of the engine, restrict a maximum torque rotational speed of the engine, or reduce an output of the engine when an amount of the reductant stored in the reductant storage tank is a preset amount or less or when an abnormality occurs in the SCR system,
wherein the control unit is further configured to prioritize the DPF renewal control over the SCR reference operation restricting control.

### Claim 2 (depends on 1)

The work vehicle according to claim 1, wherein the control unit is further configured to inhibit the SCR reference operation restricting control while the DPF renewal control is being executed.

### Claim 3 (depends on 1)

The work vehicle according to claim 1, wherein, when an execution condition of the DPF renewal control is established during the execution of the SCR reference operation restricting control, the control unit is further configured to suspend the SCR reference operation restricting control and execute the DPF renewal control.

### Claim 4 (depends on 3)

The work vehicle according to claim 3, wherein, when the DPF renewal control is completed during the suspension of the SCR reference operation restricting control, the control unit is further configured to resume the SCR reference operation restricting control.

### Claim 5 (depends on 1)

The work vehicle according to claim 1, wherein:
the DPF renewal control is an active DPF renewal control configured to perform post-injection of fuel into the engine.