System and method for starting an engine

Patent metadata

Field	Value
Publication number	US-2022010742-A1
Application number	US-202016922174-A
Country	US
Kind code	A1
Filing date	Jul 7, 2020
Priority date	Jul 7, 2020
Publication date	Jan 13, 2022
Grant date	—

Abstract

Methods and systems for operating an engine with an electrically heated catalyst and an electrically driven compressor are described. In one example, the electrically driven compressor and the electrically heated catalyst are activated before an engine start so that vehicle emissions may be reduced more efficiently at engine starting and thereafter.

First claim

1 . An engine operating method, comprising:
activating an electrically heated catalyst and opening an exhaust gas recirculation (EGR) valve in response to an indication that an engine start request is imminent.

2 . The engine method of claim 1 , where the indication that the engine start request is imminent is provided via a vehicle door position sensor.

3 . The engine method of claim 1 , where the indication that the engine start request is imminent is provided via a device that is remote from a vehicle, the device transmitting a signal.

4 . The engine method of claim 1 , further comprising closing an exhaust throttle in response to the indication that the engine start request is imminent.

5 . The engine method of claim 1 , where the EGR valve is fully opened and where the EGR valve is a low pressure EGR valve.

6 . The engine method of claim 1 , further comprising activating an electrically driven compressor in response to the indication that the engine start request is imminent.

7 . The engine method of claim 1 , further comprising closing the EGR valve in response to an engine start request.

8 . The engine method of claim 7 , further comprising opening an exhaust throttle in response to the engine start request, the exhaust throttle positioned in an exhaust system downstream of an emissions control device.

9 . An engine system, comprising:
a diesel engine including an electrically driven compressor, a low pressure exhaust gas recirculation (EGR) valve, and an exhaust system including an electrically heated catalyst; and a controller including executable instructions stored in non-transitory memory that cause the controller to open the low pressure EGR valve, activate the electrically driven compressor, and activate the electrically heated catalyst in response to an indication that a start of the diesel engine is imminent.

10 . The engine system of claim 9 , further comprising additional instructions to close the low pressure EGR valve in response to a request to start the engine.

11 . The engine system of claim 9 , further comprising an upstream throttle and a central throttle.

12 . The engine system of claim 11 , further comprising additional instructions to fully close the upstream throttle and fully open the central throttle in response to the indication that the start of the diesel engine is imminent.

13 . The engine system of claim 12 , further comprising additional instructions to fully open the upstream throttle in response to an engine start request.

14 . The engine system of claim 9 , further comprising additional instructions to not open the EGR valve in response to less a battery state of charge being less than a threshold.

15 . An engine operating method, comprising:
activating an electrically heated catalyst, opening an exhaust gas recirculation (EGR) valve, and closing an upstream throttle in response to an indication that an engine start request is imminent.

16 . The engine method of claim 15 , where the upstream throttle is fully closed.

17 . The engine method of claim 16 , further comprising opening a central throttle in response to the indication that the engine start request is imminent.

18 . The engine method of claim 17 , further comprising fully opening the upstream throttle and closing the EGR valve in response to a request to start the engine.

19 . The engine method of claim 18 , further comprising closing an exhaust throttle in response to the indication that the engine start request is imminent.

20 . The engine method of claim 15 , further comprising not activating an electrically heated catalyst, not opening an exhaust gas recirculation (EGR) valve, and not closing an upstream throttle in response to the indication that the engine start request is imminent and battery state of charge being less than a threshold.

Assignees

• Ford Global Tech Llc

Inventors

• Cox David
• Petridis Themi
• Hesketh David
• Balenovic Mario
• Kindl Helmut Matthias

Classifications

• F02N11/0807

  Remote means · CPC title

• F02N11/0829

  related to special engine control, e.g. giving priority to engine warming-up or learning · CPC title

• F02N2200/026

  Catalyst temperature · CPC title

• F02M26/05

  High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor · CPC title

• F02M26/06

  Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor · CPC title