Method for controlling an air boosting apparatus in a two-stroke, opposed piston engine, and a two-stroke, opposed piston engine with an air boosting apparatus
AssigneeVolvo Truck Corporation
InventorStephen Geyer
Life of this patent
Estimating the term…
Abstract
A method includes operating an air boosting apparatus of a two-stroke, opposed piston engine as a function of one or more factors including a first engine speed, a first torque, demand, a first altitude, a first transient rate, and one or more first ambient conditions to provide a first pressure S ratio (PR} of pre-turbine pressure (PTP) versus turbocharger compressor discharge pressure (CDP} and a first air-to-fuel ratio (AFR).
Claims22
A method for controlling an air boosting apparatus in a two-stroke, opposed piston engine, the air boosting apparatus being arranged to boost air pressure in a charge air stream upstream of a cylinder of the engine, comprising:
- operating the air boosting apparatus as a function of a first engine speed, a first torque demand, and one or more first ambient conditions provide a first pressure ratio (PR) of pre-turbine pressure (PTP) versus turbocharger compressor discharge pressure (CDP) and a first air-to-fuel ratio (AFR);
- registering a change in at least one first ambient condition of the one or more first ambient conditions to a second ambient condition;
- adjusting operation of the air boosting apparatus in response to the registered change from the first to the second ambient condition to provide a second PR and a second AFR.
A method for controlling an air boosting apparatus in a two-stroke, opposed piston engine, the air boosting apparatus being arranged to boost air pressure in a charge air stream upstream of a. cylinder of the engine, comprising:
- operating the air boosting apparatus as a function of a first engine speed, a first torque demand, and a first altitude to provide a first pressure ratio (PR) of pre-turbine pressure (PTP) versus turbocharger compressor discharge pressure (CDP) and a first air-to-fuel ratio (AFR);
- registering a change in altitude to a second altitude;
- adjusting operation of the air boosting apparatus in response to the registered change from the first to the second altitude to provide a second PR and a second AFR.
A method for controlling an air boosting apparatus in a two-stroke, opposed piston engine, the air boosting apparatus being arranged to boost air pressure in a charge air stream upstream of a cylinder of the engine, comprising:
- operating the air boosting apparatus as a function of a first engine speed and a first torque demand to provide a first pressure ratio (PR) of pre-turbine pressure (PTP) versus turbocharger compressor discharge pressure (CDP) and a first air-to-fuel ratio (AFR);
- registering a change in the first torque demand to a second torque demand;
- adjusting operation of the air boosting apparatus in response to the registered change from the first to the second torque demand to provide a second PR and a second AFR.
A method for controlling an air boosting apparatus in a two-stroke, opposed piston engine, the air boosting apparatus being arranged to boost air pressure in a charge air stream upstream of a cylinder of the engine, comprising:
- operating the air boosting apparatus as a function of a first engine speed, a first torque demand, and first transient rate to provide a first pressure ratio (PR) of pre-turbine pressure (PTP) versus turbocharger compressor discharge pressure (CDP) and a first air-to-fuel ratio (AFR);
- registering a change from the first transient rate to a second transient rate;
- adjusting operation of the air boosting apparatus in response to the registered change from the first to the second transient rate to provide a second PR and a second AFR.
A method for control ling an air boosting apparatus in a two-stroke, opposed piston engine, the air boosting apparatus being arranged to boost air pressure in a charge air stream upstream of as cylinder of the engine, comprising:
- operating the air boosting apparatus as a function of at least one of
- a first engine speed,
- a first torque demand,
- a first altitude,
- a first transient rate, and
- one or more first ambient conditions
- to provide a first pressure ratio (PR) of pre-turbine pressure (PTP) versus turbocharger compressor discharge pressure (CDP) and a first air-to-fuel ratio (AFR);
- registering a change in the at least one of
- the first engine speed to a second engine speed,
- the first torque demand to a second torque demand,
- the first altitude to a second altitude,
- the first transient rate to a second transient rate, and
- the one or more first ambient conditions to one of more second ambient conditions, and
- adjusting operation of the air boosting apparatus in response to the registered change to provide a second PR and a second AFR.
A two-stroke, opposed piston engine, comprising:
- an air boosting apparatus arranged to boost air pressure in a charge air stream upstream of a cylinder of the engine and
- a controller arranged to
- operate the air boosting apparatus as a function of at least one of
- a first engine speed,
- a first torque demand,
- a first altitude,
- a first transient rate, and
- one or more first ambient conditions
- to provide a first pressure ratio (PR) of pre-turbine pressure (PTP) versus turbocharger compressor discharge pressure (CDP) and a first air-to-fuel ratio (AFR);
- register a change in the at least one of
- the first engine speed, to a second engine speed,
- the first torque demand to a second torque demand,
- the first altitude to a second altitude,
- the first transient rate to a second transient rate, and
- the one or more first ambient conditions to one or more second ambient conditions, and
- adjust operation of the air boosting apparatus in response to the registered change to provide a second PR and a second AFR.
Dependencies are inferred from the claim text.