Regulation of concentration/fraction of substances in an exhaust stream

Patent metadata

Field	Value
Publication number	US-10035500-B2
Application number	US-201314433110-A
Country	US
Kind code	B2
Filing date	Oct 2, 2013
Priority date	Oct 2, 2012
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A method for regulation of a concentration/fraction of one or several substances in an exhaust stream in a motor vehicle through control of its driveline. The motor vehicle includes a driveline comprising a combustion engine; a driveline comprising a combustion engine connected to a gearbox, and an exhaust system for removal of an exhaust stream from the engine. The method includes the step: controlling the driveline for activation or deactivation of coasting of the vehicle based on one or several first parameters P 1 for the regulation of a concentration/fraction C EX IX EX of one or several substances T EX in the exhaust stream, where at least one of the or several first parameters P 1 are a first concentration/fraction difference between the first concentration/fraction C 1 /X 1 in the exhaust stream and a reference concentration/fraction C Ref IX Ref . Further, a computer program, a computer program product, a system and a motor vehicle such a system are disclosed.

First claim

The invention claimed is:

1. A method for regulation of a concentration/fraction of one or several substances in an exhaust stream in a motor vehicle through control of a driveline of the vehicle, wherein the motor vehicle comprises: a driveline comprising a combustion engine, driving wheels, mechanically connectable and disconnectable from the combustion engine, and an exhaust system configured for removal of an exhaust stream from the combustion engine;
the method comprises the step:
controlling the driveline to activate coasting of the vehicle or to deactivate coasting of the vehicle, based on one or several first parameters P 1 for regulation of a concentration/fraction C Ex /X Ex of one or several substances T Ex included in the exhaust stream, at least one of the one or several first parameters P 1 are a first concentration/fraction difference between the first concentration/fraction C 1 /X 1 in the exhaust stream and a reference concentration/fraction C Ref /X Ref ,
wherein coasting is activated by mechanically disconnecting the combustion engine from the driving wheels, and
wherein coasting is activated while the vehicle is moving.

2. A method according to claim 1 , wherein at least another one of the one or several first parameters P 1 is an another first concentration/fraction C 1 /X 1 or in a second concentration/fraction difference between the another first concentration/fraction C 1 /X 1 and a second concentration/fraction C 2 /X 2 in the exhaust stream.

3. A method according to claim 2 , wherein the another first concentration/fraction C 1 /X 1 is a concentration/fraction in the exhaust stream upstream of an area in the exhaust stream at which a concentration/fraction is selected to be obtained.

4. A method according to claim 2 , wherein at least another of the one or several first parameters P 1 is a time derivative or a time integral of the first concentration/fraction C 1 /X 1 or the another first concentration/fraction C 1 /X 1 or the first concentration/fraction difference and, or the second concentration/fraction difference.

5. A method according to claim 2 , wherein the another first concentration/fraction C 1 /X 1 is a concentration/fraction of a gaseous substance or a concentration of fixed particles or liquid drops, and the second concentration/fraction C 2 /X 2 is a concentration/fraction in the exhaust stream on/nearest a surface or a substrate in the exhaust system.

6. A method according to claim 2 , wherein the first concentration/fraction C 1 /X 1 and/or the second concentration/fraction C 2 /X 2 is a concentration/fraction of one or several substances from the group comprising: oxygen O2, carbon dioxide CO2, carbon oxide CO, sulphur oxides SOx, nitrogen oxides NOx, nitrogen oxide NO, nitrogen dioxide NO2, nitrous oxide N2O, ammonia NH3; and particles comprising soot, HC drops and ash.

7. A method according to claim 1 , further comprising calculating at least one of the one or several first parameters P 1 over the road section ahead of the motor vehicle based on one or several vehicle-specific and/or road-specific data for the motor vehicle.

8. A method according to claim 7 , wherein the vehicle-specific and/or road-specific data are selected from the group comprising: a road inclination, curve radii, speed limits; a weight of the motor vehicle; a rolling resistance; an air resistance; and engine-specific data comprising maximum output, minimum output, maximum torque, minimum torque, exhaust flow, exhaust recirculation content, lambda values, and injection parameters.

9. A method according to claim 1 , wherein the coasting is activated when a value for at least one of the one or several first parameters P 1 is below a threshold value P T .

10. A method according to claim 1 , wherein the controlling of the driveline for activation or deactivation of the coasting is also based on one or several additional parameters related to any from among the group comprising: a requested engine power; a requested engine torque; a calculated speed and/or a calculated road inclination for the motor vehicle over the road section ahead.

11. A method according to claim 1 , wherein the driveline is connected via a clutch of the vehicle to a gearbox of the vehicle; and
the coasting is activated through:
engaging the gearbox in a neutral gear via the clutch, or
opening of the clutch device.

12. A method according to claim 1 , wherein the method further comprises, when coasting is activated:
controlling at least one external load to increase or to reduce the concentration/fraction C Ex /X Ex of the one or several substances in the exhaust stream based on the one or several first parameters P 1 , wherein the external load is installed on an engine side of the clutch device/gearbox.

13. A method according to claim 12 , wherein the external load is one or several external loads selected from the group comprising: a system arranged for the conversion of exhaust heat into energy (WHR); auxiliaries including a water pump, fan or compressor; generator; hybrid generator, energy recycling system; retarder, exhaust brake or other auxiliary brake.

14. A method according to claim 1 , wherein the method further comprises, when coasting is activated:
controlling at least one external heater based on the one or several first parameters P 1 for the reduction or the increase of the concentration/fraction C Ex /X Ex of one or several substances in the exhaust system.

15. A method according to claim 14 , wherein the external heater is selected from the group comprising: a burner installed in the exhaust stream after exhaust exits the combustion engine's cylinders; a system arranged for injection of hydrocarbons for the oxidation or combustion on a catalyst placed in the exhaust stream; an electric heater installed in the exhaust system after exhaust exits the combustion engine's cylinders; and another external heater installed in or in close connection to the exhaust stream.

16. A method according to claim 1 , wherein the method further comprises, when coasting is activated:
controlling a fuel injection system configured for injection of fuel to the combustion engine based on the one or several first parameters P 1 for the regulation of the temperature T Ex in the exhaust stream.

17. A method according to claim 1 , wherein the method also comprises:
controlling an injection system configured for injection of fuel, urea or another liquid to the exhaust stream based on the one or several first parameters P 1 for the regulation of the concentration/fraction C Ex /X Ex of one or several substances in the exhaust stream.

18. A method according to claim 1 , wherein the method further comprises, when coasting is activated:
controlling an exhaust flow in the exhaust stream, or of one parameter depending on the exhaust flow, based on the one or several first parameters P 1 for the regulation of the concentration/fraction C Ex /X Ex of one or several substances in the exhaust stream.

19. A method according to claim 18 , wherein controlling the exhaust stream comprises:
controlling a gas flow system for exhaust gas recirculation (EGR) which is configured for the combustion engine based on the one or several parameters P 1 for the regulation of the concentration/fraction C Ex /X Ex of one or several substances in the exhaust stream; and/or
controlling an intake system arranged for regulation of an air flow to the combustion engine based on the one or several first parameters P 1 for the regulation of the concentration/fractio

Assignees

• Scania Cv Ab

Inventors

• Stenlåås Ola
• Roos Fredrik

Classifications

• F02D41/021

  Introducing corrections for particular conditions exterior to the engine (conjoint control of vehicle sub-units for propelling the vehicle B60W30/18) · CPC title

• F02D41/005

  according to engine operating conditions · CPC title

• F02D31/001

  Electric control of rotation speed · CPC title

• F02D41/0002

  Controlling intake air · CPC title

• B60W2710/06

  Combustion engines, Gas turbines · CPC title