# US 7,607,302 B2 · Automotive turbocharger systems

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

- Number: US 7,607,302 B2
- Document ID: US7607302B2
- Status: Granted
- Kind: B2
- Application number: 10/570,877
- Filed: 2004-09-06
- Published: 2007-03-22
- Granted: 2009-10-27
- Earliest claimed: 2003-09-08
- Assignees: Ricardo UK Limited
- Inventors: Malcolm Fry; Richard C. E. Cornwell; Richard King; Matthew Gerard Beasley
- Web page: https://patentgrep.com/patent/US7607302B2

## CPC

- F02B 37/183: {Arrangements of bypass valves or actuators therefor}
- F02B 37/002: {the exhaust supply to one of the exhaust drives can be interrupted}
- F02B 37/013: with exhaust-driven pumps arranged in series
- F02B 37/16: by bypassing charging air
- F02B 37/162: {by bypassing, e.g. partially, intake air from pump inlet to pump outlet}
- F02B 37/18: by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere}
- F02D 23/00: Controlling engines characterised by their being supercharged
- F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)}
- F02D 2041/1409: {using at least a proportional, integral or derivative controller}
- Y02T 10/12: Improving ICE efficiencies
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- 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 turbocharger system comprising first and second turbochargers, configured in series, where the turbochargers hand over control from one turbocharger to the other, which incorporates switching adjustment terms at the point of transition to ensure a smooth transition.

## Claims

### Claim 1

A method of controlling a turbo charger system having first and second turbo chargers with respective first and second operational ranges, comprising:
controlling a first turbo charger according to a first control scheme in a first operational range and slaving control of a second turbo charger to the first control scheme, and
controlling the second turbo charger according to a second control scheme in a second operational range in which at a transition between the first and second control schemes, a switch term is incorporated into the second control scheme, wherein the first control scheme is a PID control scheme and the switch term is a measure of the proportional gain according to the second control scheme.

### Claim 2 (depends on 1)

A method as claimed in claim 1, in which the switch term is a measure of the deviation between a control parameter of the second turbo charger according to the first scheme and a control parameter of the second turbo charger according to the second scheme.

### Claim 3 (depends on 1)

A method as claimed in claim 1, in which the integral term is initialized at zero according to the second control scheme.

### Claim 4 (depends on 1)

A method as claimed in of claim 1, in which one of the first and second turbo chargers is a high pressure turbo charger and the other of the first and second turbo chargers is a low pressure turbo charger.

### Claim 5

A control unit having a computer-readable medium encoded with a computer program configured to implement a method comprising:
controlling a first turbo charger according to a first control scheme in a first operational range and slaving control of a second turbo charger to the first control scheme, and
controlling the second turbo charger according to a second control scheme in a second operational range in which at a transition between the first and second control schemes, a switch term is incorporated into the second control scheme, wherein the first control scheme is a PID control scheme and the switch term is a measure of the proportional gain according to the second control scheme.

### Claim 6 (depends on 5)

The control unit of claim 5, wherein said control unit is a computer.

### Claim 7 (depends on 5)

The control unit of claim 5, wherein said control unit is an engine control unit.