Multi-pulse enable determination and transition control systems and methods
View Patent ↗A coordinated torque control (CTC) system is provided that includes an engine capacity module, a multi-pulse enable module, and a catalyst light off torque reserve module. The engine capacity module determines a torque capacity of an engine and generates a maximum engine torque capacity signal. The multi-pulse enable module enables a multi-pulse mode that includes the injection of at least two pulses of fuel into a cylinder of the engine during a combustion cycle. The multi-pulse enable module generates a multi-pulse desired signal to operate in the multi-pulse mode based on the maximum engine torque capacity signal, a catalyst light off signal, and a brake torque request signal. The catalyst light off torque reserve module generates a torque reserve corrected signal based on the multi-pulse desired signal.
1. A coordinated torque control (CTC) system comprising:
an engine capacity module that determines a torque capacity of an engine and that generates a maximum engine torque capacity signal;
a multi-pulse enable module that enables a multi-pulse mode that includes the injection of at least two pulses of fuel into a cylinder of the engine during a combustion cycle,
wherein the multi-pulse enable module generates a multi-pulse desired signal to operate in the multi-pulse mode based on the maximum engine torque capacity signal, a catalyst light off signal, a brake torque request signal, and a torque reserve corrected signal; and
a catalyst light off torque reserve module that generates the torque reserve corrected signal based on the multi-pulse desired signal.
2. The CTC system of claim 1 , wherein the multi-pulse enable module generates the multi-pulse desired signal based on an engine speed signal and a barometric pressure signal.
3. The CTC system of claim 1 , wherein the catalyst light off torque reserve module generates the torque reserve corrected signal based on an air per cylinder signal and an engine speed signal.
4. The CTC system of claim 1 , further comprising:
a reserve and load module that generates an output based on the torque reserve corrected signal; and
an actuator module that generates an air torque request signal and a spark torque request signal based on the output.
5. The CTC system of claim 1 , wherein the multi-pulse enable module transitions from the multi-pulse mode to a single pulse mode when a sum of the brake torque request signal and the torque reserve corrected signal is greater than or equal to the maximum engine torque capacity signal plus an offset.
6. The CTC system of claim 1 , wherein the multi-pulse enable module enables operation in the multi-pulse mode when speed of the engine is within a first predetermined range and ambient air pressure is greater than a predetermined air pressure.
7. The CTC system of claim 6 , wherein the multi-pulse enable module maintains a multi-pulse desired signal state when the engine speed is within a second predetermined range.
8. The CTC system of claim 1 , wherein the multi-pulse enable module generates a multi-pulse actual signal to switch from the multi-pulse mode to a single pulse mode when a the brake torque request signal is greater than or equal to a minimum immediate engine capacity torque for the single pulse mode plus an offset.
9. The CTC system of claim 1 , wherein the multi-pulse enable module transitions to the multi-pulse mode when the multi-pulse desired signal indicates a multi-pulse mode request and the multi-pulse actual signal indicates a single-pulse mode request.
10. The CTC system of claim 1 , wherein the multi-pulse enable module transitions to a single pulse mode when the multi-pulse desired signal indicates a single pulse mode request, a multi-pulse actual signal indicates a multi-pulse mode request, and the brake torque request signal is greater than a minimum immediate engine capacity torque for the single pulse mode plus an offset.
11. The CTC system of claim 1 , wherein the multi-pulse enable module initiates an exit ramping mode to transition from the multi-pulse mode to a single pulse mode when a catalyst light off mode is complete.
12. The CTC system of claim 11 , further comprising a phaser scheduling module that ramps phaser positioning during the exit ramping mode.
13. The CTC system of claim 11 , further comprising an air flow actuator module that ramps air flow during the exit ramping mode based on a ramping of the torque reserve corrected signal,
wherein the catalyst light off torque reserve module provides the ramping of the torque reserve corrected signal during the exit ramping mode.
14. The CTC system of claim 11 , further comprising a spark actuator module that ramps spark during the exit ramping mode based on a ramping of the torque reserve corrected signal,
wherein the catalyst light off torque reserve module provides the ramping of the torque reserve corrected signal during the exit ramping mode.
15. The CTC system of claim 1 , further comprising a spark actuator module that adjusts spark timing based on a multi-pulse actual signal,
wherein the multi-pulse enable module generates the multi-pulse actual signal to switch from the multi-pulse mode to a single pulse mode,
wherein the spark actuator module retards spark timing of the engine when switching from the multi-pulse mode to the single pulse mode, and
wherein the spark actuator module retards the spark timing such that a first output torque of the engine generated during the multi-pulse mode is equal to a second output torque of the engine generated during the single pulse mode.
16. The CTC system of claim 1 , wherein the multi-pulse desired signal is generated based on the torque reserve corrected signal, and
wherein the multi-pulse desired signal is the same as the torque reserve corrected signal when the CTC system is operating in the multi-pulse mode.
17. A method of operating a coordinated torque control (CTC) system comprising:
determines a torque capacity of an engine and generating a maximum engine torque capacity signal;
enabling a multi-pulse mode that includes the injection of at least two pulses of fuel into a cylinder of the engine during a combustion cycle; and
generating a multi-pulse desired signal to operate in the multi-pulse mode based on the maximum engine torque capacity signal, a catalyst light off signal, and a brake torque request signal,
wherein the multi-pulse desired signal is generated based on a torque reserve corrected signal.
18. The method of claim 17 wherein the multi-pulse mode is enabled when a sum of the brake torque request signal and the torque reserve corrected signal is less than the maximum engine torque capacity signal plus an offset.
19. The method of claim 18 further comprising maintain output torque of the engine at a constant level when transitioning between the multi-pulse mode and a single pulse mode by adjusting spark timing of the engine by generation of a torque request and use of a torque model that is based on the multi-pulse mode and a single-pulse mode.