Device for controlling boost pressure in an internal combustion engine

• US 6,253,551 B1
• Filed: 07/24/2000
• Issued: 07/03/2001
• Est. Priority Date: 10/02/1997
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Baeuerle, Michael, Ries-Mueller, Klaus, Lohmann, Andrea
• Primary Examiner(s): Nguyen, Hoang
• Application Number:
  US09/509,887
• Time in Patent Office: 344 Days
• Field of Search: 606/02, 606/051, 606/12, 606/15
• US Class Current: 60/602
• CPC Class Codes: F02D 2041/1409 using at least a proportional, integral or derivative controller
• CPC Class Codes: F02D 23/00 Controlling engines characterised by their being supercharged
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: 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
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

An arrangement includes a first controller which is only switched through to an actuator for a turbocharger if a fault recognition device detects no fault in the operation of the engine. A switchover is made from the first controller to a second controller, if the fault recognition device detects a critical fault. In this connection, the second controller receives a system deviation as an input signal that is different from the one received by the first controller. Thus in the event of a fault, the turbocharger can be controlled in a very flexible manner without the danger that the speed of the turbocharger is increased into its critical range.

Claims

1. An arrangement for controlling a boost pressure of an internal combustion engine, comprising:

at least one turbocharger arranged in at least one exhaust line of an internal combustion engine;

an air pressure sensor arranged in an intake path on a pressure side of the at least on turbocharger, the air pressure sensor measuring a boost pressure;

an air mass sensor arranged in an intake path on a suction side of the at least on turbocharger, the air mass sensor measuring an air mass;

an actuator acting on the at least on turbocharger;

a fault recognition device;

a first controller receiving a first system deviation as an input signal, the first controller being switched through to the actuator only when the fault recognition device detects no fault in an operation of the internal combustion engine that is critical for the at least one turbocharger, an actual value of the first system deviation being the boost pressure; and

a second controller receiving a second system deviation as an input signal, a switchover being made from the first controller to the second controller when the fault recognition device detects a critical fault, an actual value of the second system deviation being the air mass.

2. The arrangement according to claim 1, wherein:

in the event of a fault, a control signal for the actuator is generated by superimposing a precontrol signal on an output signal of the second controller.

3. The arrangement according to claim 2, wherein:

the precontrol signal is a function of the type of fault.

4. The arrangement according to claim 1, wherein:

the fault recognition device monitors the air pressure sensor and the air mass sensor for faults.

5. The arrangement according to claim 1, wherein:

the fault recognition device monitors a lambda control for faults.

6. The arrangement according to claim 1, wherein:

the fault recognition device detects combustion misses.

7. The arrangement according to claim 1, wherein:

the internal combustion engine has two rows of cylinders and two turbochargers;

the actuator acts on the two turbochargers simultaneously; and

the switchover takes place if the fault recognition device detects a fault in an area of one of the two rows of cylinders.