US 2015/0032308 A1 · DIESEL ENGINE STEADY STATE AND TRANSIENT HYBRID OPTIMIZATION

Abstract

A method for selecting an engine operating point in a multi-mode powertrain system includes monitoring a desired axle torque based on an operator torque request and vehicle speed. For each available combustion mode of the diesel engine, engine torque and speed ranges are received and a plurality of fuel losses and a plurality of emissions losses are retrieved, each fuel and emissions loss corresponding to respective ones of a plurality of engine operating points within the engine torque and speed ranges. The respective fuel and emissions losses are compared at each of a plurality of potential engine operating points within the engine torque and speed ranges of the available combustion modes. A desired engine operating point within one of the available combustion modes is selected that corresponds to one of the potential engine operating points having a lowest power loss based on the compared respective fuel and emissions losses.

Claims19

Dependent claims

Method for selecting an engine operating point in a multi-mode powertrain system employing a diesel engine and one or more non-combustion torque machines arranged to transfer torque to a driveline via a transmission device, the method comprising:

monitoring a desired axle torque based on an operator torque request and vehicle speed;
monitoring availability of a plurality of combustion modes of the diesel engine;
for each available combustion mode:
receiving an engine torque range from a minimum engine torque to a maximum engine torque,
receiving an engine speed range from a minimum engine speed to a maximum engine speed,
retrieving a plurality of fuel losses, each fuel loss corresponding to respective ones of a plurality of engine operating points within the engine torque and speed ranges,
retrieving a plurality of emissions losses, each emissions loss corresponding to respective ones of the plurality of engine operating points within the engine torque and speed ranges, and
at each of a plurality of potential engine operating points within the engine torque and speed ranges of the available combustion modes, comparing the respective fuel and emissions losses;
and
selecting a desired engine operating point within one of the available combustion modes, the desired engine operating point corresponding to one of the potential engine operating points having a lowest power loss based on the compared respective fuel and emissions losses.

7 more elements

Method for selecting a desired engine torque in a multi-mode powertrain system employing a diesel engine and one or more electric machines arranged to transfer torque to a driveline via a transmission device, the method comprising:

monitoring a desired axle torque based on an operator torque request and a present vehicle speed;
monitoring availability of at least two combustion modes of the diesel engine, one of the combustion modes having a higher emissions efficiency than the other one or more combustion modes;
for each available combustion mode:
receiving engine torque and speed ranges;
retrieving a plurality of fuel consumption values, each fuel consumption value corresponding to respective ones of a plurality of engine operating points within the engine torque and speed ranges;
retrieving a plurality nitrous oxide values, each nitrous oxide value corresponding to respective ones of the plurality of engine operating points within the engine torque and speed ranges, and
at each of a plurality of potential engine operating points within the engine torque and speed ranges of the available combustion modes, summing the respective fuel consumption value and the respective nitrous oxide value;
and
selecting the desired engine torque within one of the available combustion modes, the desired engine torque corresponding to one of the potential engine operating points having a lowest summed value based on the summing the respective fuel consumption value and the respective nitrous oxide value.

6 more elements

Dependencies are inferred from the claim text.

Diesel engine steady state and transient hybrid optimization

Life of this patent

Diesel engine steady state and transient hybrid optimization

Life of this patent

Abstract

Claims19