Method and system for compressor outlet temperature regulation

• US 10,273,874 B2
• Filed: 04/15/2016
• Issued: 04/30/2019
• Est. Priority Date: 04/15/2016
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Santillo, Mario Anthony, Hellstrom, John Erik Mikael, Ossareh, Hamid-Reza, Xiao, Baitao
• Primary Examiner(s): Gimie, Mahmoud
• Assistant Examiner(s): Zaleskas, John
• Application Number:
  US15/130,500
• Publication Number:
  US 20170298811A1
• Time in Patent Office: 1,110 Days
• CPC Class Codes: F02B 37/12 Control of the pumps
• CPC Class Codes: F02D 2009/0225 Intake air or mixture temperature
• CPC Class Codes: F02D 2009/0227 Atmospheric pressure
• CPC Class Codes: F02D 2009/0276 Throttle and EGR-valve operated together
• CPC Class Codes: F02D 2041/0017 by simultaneous control of throttle and exhaust gas recirculation
• CPC Class Codes: F02D 2041/1412 using a predictive controller
• CPC Class Codes: F02D 2200/701 Information about vehicle position, e.g. from navigation system or GPS signal
• CPC Class Codes: F02D 2200/703 Atmospheric pressure
• CPC Class Codes: F02D 23/00 Controlling engines characterised by their being supercharged
• CPC Class Codes: F02D 41/0002 Controlling intake air
• 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 41/1401 characterised by the control or regulation method F02D41/1473, F02D41/1477 take precedence
• CPC Class Codes: F02D 41/1448 the characteristics being an exhaust gas pressure
• CPC Class Codes: F02D 41/18 by measuring intake air flow
• CPC Class Codes: F02D 41/2406 using essentially read only memories
• CPC Class Codes: F02D 41/26 using computer, e.g. microprocessor
• CPC Class Codes: F02D 9/02 concerning induction conduits throttle valves, or arrangements thereof in conduits F02D9/08
• CPC Class Codes: G01C 21/26 specially adapted for navigation in a road network
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

Methods and systems are provided for controlling a boosted engine system, having a turbocharger and a charge air cooler, to limit overheating of a compressor outlet. In one example, a method includes predicting an engine torque profile based on current and future engine operating conditions. The method then models a compressor outlet temperature profile and reduces engine torque output to limit overheating of the compressor outlet.

Claims

1. An engine method, comprising:

estimating a compressor speed profile for a future horizon of vehicle operation based on current and predicted engine operating conditions, the compressor speed profile including a predicted compressor speed at each point of different time points of the future horizon; and

adjusting an engine torque output responsive to each of a degree and a duration over which the predicted compressor speed, at a point of the different time points of the compressor speed profile, exceeds a threshold speed.

2. The engine method of claim 1, wherein the adjusting includes limiting the engine torque output below a driver demand based torque as the degree at which a peak predicted compressor speed at the point of the different points of the compressor speed profile exceeds the threshold speed increases and as the duration over which the predicted compressor speed at the point of the different points of the compressor speed profile exceeds the threshold speed increases.

3. The engine method of claim 2, wherein the estimating includes estimating an engine torque profile for the future horizon based on the current and predicted engine operating conditions, and estimating the compressor speed profile based on a filtered value of an estimated engine torque profile.

4. The engine method of claim 2, wherein a compressor is coupled to a turbine, and wherein limiting the engine torque output includes increasing an opening of a wastegate coupled to the turbine to lower compressor speed and decrease boost pressure.

5. The engine method of claim 2, wherein limiting the engine torque output includes reducing an opening of an intake throttle to reduce an intake air flow to the engine.

6. The engine method of claim 2, wherein limiting the engine torque output further includes one or more of increasing an opening of an EGR valve, and retarding spark timing.

7. The engine method of claim 1, wherein the current and predicted engine operating conditions are based on inputs from external vehicle communications, the external vehicle communications including one or more of a navigation system and a wireless communication unit communicatively coupled to an engine, wherein the inputs include one or more of vehicle data, navigation data, location data, map data, terrain data, and weather data, and wherein the current and predicted engine operating conditions include each of a vehicle weight, an engine size, a vehicle speed, an engine torque, an engine load, barometric pressure, exhaust pressure, manifold pressure (MAP), inlet air temperature, a compressor pressure ratio, compressor efficiency, throttle inlet pressure, and an intake mass airflow rate.

8. The engine method of claim 7, wherein the engine is a boosted engine including an intake compressor, and wherein the adjusting the engine torque output includes adjusting the engine torque output to maintain each of a compressor speed below the threshold speed, and the throttle inlet pressure below a threshold pressure.