# US 8,543,288 B2 · Diagnostic method and apparatus for an exhaust pressure regulator

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- Number: US 8,543,288 B2
- Document ID: US8543288B2
- Status: Granted
- Kind: B2
- Application number: 13/139,302
- Filed: 2008-12-12
- Published: 2011-12-22
- Granted: 2013-09-24
- Earliest claimed: 2008-12-12
- Assignees: Volvo Lastvagnar AB
- Applicants: Per-Åke Bligård; Vinka Miketa; Göran Olsson
- Inventors: Per-Åke Bligård; Vinka Miketa; Göran Olsson
- Web page: https://patentgrep.com/patent/US8543288B2

## CPC

- F02D 9/06: Exhaust brakes
- F02D 41/1448: {the characteristics being an exhaust gas pressure}
- F02D 41/221: {relating to the failure of actuators or electrically driven elements}
- F02D 41/222: {relating to the failure of sensors or parameter detection devices}
- F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)}
- F02D 2200/0406: Intake manifold pressure
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A diagnostic method for an exhaust pressure regulator provided in an exhaust system connected to a turbocharged internal combustion engine includes demanding engine brake, measuring a back pressure in the exhaust system by a back pressure sensor provided between the exhaust pressure regulator and a turbo unit when demanding engine brake, measuring the boost pressure by a boost pressure sensor provided in the inlet manifold when demanding engine brake, comparing the measured back pressure and the measured boost pressure with stored back pressure and boost pressure values in order to determine whether there is a defective pressure regulator or a defective backpressure sensor. A diagnostic apparatus for an exhaust pressure regulator provided in an exhaust system connected to a turbocharged internal combustion engine is also provided.

## Claims

### Claim 1

A diagnostic method for an exhaust pressure regulator provided in an exhaust system connected to a turbocharged internal combustion engine, comprising:
(a) demanding engine brake,
(b) measuring a backpressure in the exhaust system by a backpressure sensor when demanding engine brake,
(c) measuring boost pressure by a boost pressure sensor when demanding engine brake, and
(d) comparing the measured backpressure and the measured boost pressure with stored backpressure and boost pressure values in order to determine whether there is a defective pressure regulator or a defective backpressure sensor.

### Claim 2 (depends on 1)

The diagnostic method according to claim 1, comprising:
providing the backpressure sensor between the exhaust pressure regulator and a turbo unit.

### Claim 3 (depends on 1)

The diagnostic method according to claim 1, comprising:
providing the backpressure sensor in an exhaust gas manifold upstream a turbo unit.

### Claim 4 (depends on 1)

The diagnostic method according to claim 1, comprising:
providing the boost pressure sensor in an inlet manifold.

### Claim 5 (depends on 1)

The diagnostic method according to claim 1, comprising:
providing the boost pressure sensor between a compressor of a turbo unit and an inlet valve of the internal combustion engine.

### Claim 6 (depends on 1)

The diagnostic method according to claim 1, comprising (e) Alarming an operator if there is a defective pressure regulator or backpressure sensor.

### Claim 7 (depends on 1)

The diagnostic method according to claim 1, wherein the backpressure sensor is defective if the measured backpressure is below a predetermined value and the measured boost pressure is below a predetermined value.

### Claim 8 (depends on 1)

The diagnostic method according to claim 1, wherein the pressure regulator is defective if the measured backpressure is below a predetermined value and the measured boost pressure is above a predetermined value.

### Claim 9 (depends on 1)

The diagnostic method according to claim 1, wherein the backpressure sensor is defective if the measured backpressure is above a predetermined value and the measured boost pressure is above a predetermined value.

### Claim 10 (depends on 1)

The diagnostic method according to claim 1, wherein the pressure regulator is defective if the measured backpressure is above a predetermined value and the measured boost pressure is below a predetermined value.

### Claim 11

A diagnostic apparatus for an exhaust pressure regulator provided in an exhaust system connected to a turbocharged internal combustion engine, comprising:
(a) means for demanding engine brake,
(b) means for measuring a backpressure in the exhaust system by a backpressure sensor provided between the exhaust pressure regulator and a turbo unit when demanding engine brake,
(c) means for measuring boost pressure by a boost pressure sensor provided in the inlet manifold when demanding engine brake, and
(d) means for comparing the measured backpressure and the measured boost pressure with stored backpressure and boost pressure values in order to determine whether there is a defective pressure regulator or a defective backpressure sensor.

### Claim 12 (depends on 11)

The diagnostic apparatus according to claim 11, further comprising means for alarming an operator if there is a defective pressure regulator or backpressure sensor.

### Claim 13

A vehicle comprising means for performing diagnostic method for an exhaust pressure regulator provided in an exhaust system connected to a turbocharged internal combustion engine, the method comprising:
(a) demanding engine brake,
(b) measuring a backpressure in the exhaust system by a backpressure sensor when demanding engine brake,
(c) measuring boost pressure by a boost pressure sensor when demanding engine brake, and
(d) comparing the measured backpressure and the measured boost pressure with stored backpressure and boost pressure values in order to determine whether there is a defective pressure regulator or a defective backpressure sensor.

### Claim 14

A vehicle comprising:
a diagnostic apparatus for an exhaust pressure regulator provided in an exhaust system connected to a turbocharged internal combustion engine, the diagnostic apparatus comprising;
(a) means for demanding engine brake,
(b) means for measuring a backpressure in the exhaust system by a backpressure sensor provided between the exhaust pressure regulator and a turbo unit when demanding engine brake,
(c) means for measuring the boost pressure by a boost pressure sensor provided in the inlet manifold when demanding engine brake, and
(d) means for comparing the measured backpressure and the measured boost pressure with stored backpressure and boost pressure values in order to determine whether there is a defective pressure regulator or a defective backpressure sensor.