Fast torque response for boosted engines
AssigneeTula Technology, Inc.
InventorsElliott A. Ortiz-Soto, Shahaboddin Owlia
Life of this patent
Estimating the term…
Abstract
Engine controllers and control schemes are provided for managing engine state transitions requiring increased compressor pressure ratios in turbocharged engines. In some circumstances, turbo lag can be mitigated by initially transitioning the engine to an intermediate engine state that directly or indirectly increases airflow through the engine and turbocharger relative to what would be possible if the engine were immediately commanded to operate at the target engine state. After reaching a point where the desired torque is actually generated at the intermediate engine state, the operational settings are gradually reduced to the target effective firing density while increasing the operational compressor pressure ratio to the target compressor ratio.
Claims38
An engine controller for controlling a boosted engine including a turbocharger having a turbine and a compressor and configured to direct operation of the engine and being further configured to:
- in response to a selected torque request, determine that a transition from a first engine state to a target engine state is desired, the first engine state having an associated first engine torque output, an associated first compressor pressure ratio and at least one additional initial engine setting(s), and the target engine state having an associated target engine torque output, an associated target compressor pressure ratio that is higher than the first compressor pressure ratio and at least one additional target engine setting(s), each additional target engine setting corresponding to an associated one of the additional initial engine setting(s);
- in response to the determination that the transition from the first engine state to a target engine state is desired, direct the engine to transition to at least one second additional engine setting(s) that is/are different than the first and target additional engine settings and outside of a range between the first and target additional engine settings to thereby directly or indirectly increase a flow of gases through the engine and the turbocharger;
- and
- after reaching the second additional engine setting(s) and producing the target torque at the second additional engine setting(s), adjusting at least one operational engine setting(s) from the second additional engine setting(s) to the target additional engine setting(s) while increasing an operational compressor pressure ratio to the target compressor ratio.
An engine controller for controlling a boosted engine including a turbocharger having a turbine and a compressor and configured to direct operation of the engine and being further configured to:
- in response to a selected torque request, determine that a transition from a first engine state to a target engine state is desired, the first engine state having an associated first engine torque output, an associated first firing density and an associated first compressor pressure ratio, and the target engine state having an associated target engine torque output, an associated target firing density and an associated target compressor pressure ratio that is higher than the first compressor pressure ratio;
- in response to the determination that the transition from the first engine state to a target engine state is desired, direct the engine to transition to a second firing density that is higher than the first firing density and higher than the target firing density thereby increasing a flow of gases through the engine and the turbocharger;
- and
- after reaching the second firing density and producing the target torque at the second firing density, reducing an operational firing density from the second firing density to the target firing density while increasing an operational compressor pressure ratio to the target compressor ratio.
An engine controller for controlling a boosted engine including a turbocharger having a turbine and a compressor and configured to direct operation of the engine and being configured to:
- in response to a selected torque request, determine that a transition from a first engine state to a target engine state is desired, the first engine state having an associated first engine torque output, an associated first firing density, an associated first compressor pressure ratio, and a first mass airflow rate, and the target engine state having an associated target engine torque output, an associated target firing density, a target mass airflow rate, and an associated target compressor pressure ratio that is higher than the first compressor pressure ratio;
- in response to the determination that the transition from the first engine state to a target engine state is desired, direct the engine to transition to a second engine state while maintaining the first compressor pressure ratio, the second engine state having second mass airflow rate that is higher than the first mass airflow and higher than the target mass airflow rate;
- and
- after reaching the second engine state and producing the target torque at the second engine state, reducing an operational mass airflow rate to the target mass airflow rate while increasing an operational compressor pressure ratio to the target compressor ratio.
Dependencies are inferred from the claim text.