# US 8,539,756 B2 · Exhaust purification device for internal combustion engine

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- Number: US 8,539,756 B2
- Document ID: US8539756B2
- Status: Granted
- Kind: B2
- Application number: 13/257,175
- Filed: 2010-03-11
- Published: 2012-01-12
- Granted: 2013-09-24
- Earliest claimed: 2009-03-19
- Assignees: Yanmar Co., Ltd.
- Applicants: Katsunari Jonouchi; Michihiko Hara
- Inventors: Katsunari Jonouchi; Michihiko Hara
- Web page: https://patentgrep.com/patent/US8539756B2

## CPC

- F02D 41/064: {at cold start (F02D41/067 takes precedence)}
- F01N 9/002: {of filter regeneration}
- F01N 11/002: {the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus}
- F01N 13/0097: {the purifying devices are arranged in a single housing}
- F02D 41/029: {the exhaust gas treating apparatus being a particulate filter}
- F02D 41/1446: {the characteristics being exhaust temperatures}
- F02D 41/1448: {the characteristics being an exhaust gas pressure}
- F02D 41/22: Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)}
- F01N 2550/04: Filtering activity of particulate filters
- F01N 2900/1404: Exhaust gas temperature
- F02D 2041/227: {Limping Home, i.e. taking specific engine control measures at abnormal conditions}
- F02D 2200/0416: Estimation of air temperature
- F02D 2200/0802: Temperature of the exhaust gas treatment apparatus
- F02N 2200/026: Catalyst temperature
- Y02T 10/40: Engine management systems
- 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)
- 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)
- F02N: STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Provided is an exhaust purification device for an internal combustion engine, wherein the operation of an internal combustion engine can be prevented from being maintained when a particulate filter is melted. An exhaust purification device is comprised of a particulate filter; a downstream-side temperature sensor which detects a downstream-side exhaust temperature; a filter temperature sensor which detects a filter temperature; an exhaust differential pressure detection device which calculates an exhaust differential pressure between an upstream-side exhaust pressure and a downstream-side exhaust pressure at predetermined time intervals; a notification device; and an ECU which controls the internal combustion engine based on a differential pressure variation first and second exhaust differential pressures or the downstream-side exhaust temperature.

## Claims

### Claim 1

An exhaust purification device for an internal combustion engine comprising:
a particulate filter;
an exhaust temperature detection means detecting a downstream-side exhaust temperature of the particulate filter;
an exhaust differential pressure detection means calculating a differential pressure between an upstream-side exhaust pressure of the particulate filter and a downstream-side exhaust pressure of the particulate filter;
a notification means performing notification based on the state of the particulate filter; and
a control means controlling the internal combustion engine,
characterized in that
the control means is connected to the exhaust temperature detection means, the exhaust differential pressure detection means and the notification means, and
the control means is programmed to calculate a differential pressure variation based on a first differential pressure detected at a predetermined time and a second differential pressure detected after the predetermined time, and when the differential pressure variation is not less than a reference variation, or when the downstream-side exhaust temperature is not less than a reference temperature for a reference time or longer, the control means is programmed to request a stop of the driving of the internal combustion engine by the notification means or stop the driving of the internal combustion engine.

### Claim 2 (depends on 1)

The exhaust purification device for the internal combustion engine according to claim 1, wherein the control means is programmed to request a check of the particulate filter by the notification means when the exhaust temperature detection means detects a value not less than the reference temperature for the reference time or longer at least once, or when the exhaust differential pressure detection means calculates a value not less than the reference variation at least once.

### Claim 3 (depends on 2)

The exhaust purification device for the internal combustion engine according to claim 2, wherein the control means is connected to a filter temperature detection means detecting a filter temperature of the particulate filter, and when the filter temperature detected by the filter temperature detection means is not less than a reference filter temperature, the control means is programmed to prohibit start of the internal combustion engine.

### Claim 4 (depends on 3)

The exhaust purification device for the internal combustion engine according to claim 3, wherein when the control means has requested a check of the particulate filter by the notification means for a reference period or longer and the particulate filter is not checked, the control means is programmed to restrict the output of the internal combustion engine until the particulate filter is checked.