Method for preferential selection of modes and gear with inertia effects for a hybrid powertrain system
View Patent ↗A method for controlling a hybrid powertrain system selectively operative in one of a plurality of operating range states including an engine includes monitoring an operator torque request and a rotational speed of the output member, determining inertial effects of the transmissions, determining motor torque outputs from the electrical machines and an engine based upon the inertial effects, and selecting a preferred operating range state and a preferred input speed from the engine to the transmission based upon the operator torque request and the inertial effects.
1. Method for controlling a powertrain system including an engine coupled to an input member of a transmission device including torque generating machines and an energy storage device connected thereto, the transmission operative to transfer power between the input member and an output member of the transmission and the torque generating machines and selectively operative in one of a plurality of operating range states, the method comprising:
monitoring an operator torque request and a rotational speed of the output member;
determining inertial effects of the transmission comprising inertial effects of the input member and the output member;
determining motor torque outputs from the torque generating machines and an input torque from the engine based upon the inertial effects; and
selecting a preferred operating range state and a preferred input speed of the input member based upon the operator torque request and the inertial effects, said preferred input speed of the input member comprising an engine input speed to the transmission and selected to compensate for additional power required to one of increase and decrease the input speed of the input member resulting from the determined inertial effects.
2. The method of claim 1 , wherein the inertial effect of the output member is based upon the rotational speed of the output member.
3. The method of claim 1 , further comprising determining the inertial effect of the input member for a fixed gear operating range state based upon the inertial effect of the output member for the fixed gear mode operating range state.
4. The method of claim 3 , comprising determining the inertial effect of the input member based upon the inertial effect of the output member and parametric values based upon hardware gear and shaft interconnections and the fixed gear mode operating range state.
5. The method of claim 1 , wherein the inertial effect of the output member comprises a change in the output member speed over a predetermined elapsed time period.
6. The method of claim 1 , wherein the inertial effect of the output member comprises a rotational acceleration of the output member and wherein the inertial effect of the input member comprises a rotational acceleration of the input member.
7. Method for controlling a powertrain system including an engine coupled to an input member of a transmission including torque generating machines and an energy storage device connected thereto, the transmission operative to transfer power between the input member and an output member and the torque generating machines and selectively operative in one of a plurality of operating range states, the method comprising:
monitoring an operator torque request and a rotational speed of the output member;
determining inertial effects of the transmission;
determining motor torque outputs from the torque generating machines and an input torque from the engine based upon the inertial effects;
selecting a preferred operating range state and a preferred input speed of the input member based upon the operator torque request and the inertial effects;
monitoring the input torque from the engine to the transmission;
iteratively determining motor torques for the torque generating machines based upon the engine input torque, the inertial effects, and the operating range state;
determining a power cost for operating at each of the iteratively determined motor torques of the torque generating machines and the engine input torque for each operating range state;
selecting a preferred power cost and corresponding desired engine operating point based upon the costs for each of the operating range states; and
selecting the preferred operating range state based upon the preferred costs for the operating range states.
8. The method of claim 7 , further comprising:
iteratively determining motor torques for the torque generating machines for a fixed gear mode operating range state; and
determining a power cost for operating at each of the iteratively determined motor torques of the torque generating machines and the engine operating point comprising engine input torque for each of the fixed gear mode operating range states.
9. The method of claim 7 , wherein engine operating points comprise engine input speed and engine input power, and further comprising:
iteratively determining motor torques for the torque generating machines for a continuously variable operating mode; and
determining a cost for operating at each of the iteratively determined motor torques of the torque generating machines and the engine input torque for each of the continuously variable operating modes.
10. The method of claim 9 , further comprising:
determining ranges of permissible input speeds and engine input power;
executing a two-dimensional search engine to iteratively generate parametric values within the ranges of permissible input speeds and engine input power;
determining motor torques for the torque generating machines based upon the generated parametric values and the operating range state; and
identifying a preferred engine input power and preferred motor torques effective to expend a minimum cost.
11. The method of claim 10 , further comprising controlling operation of the engine to achieve the preferred engine input power.
12. The method of claim 10 , comprising determining the motor torques for the torque generating machines based upon the following equation
[
T
A
T
B
]
=
[
a
11
a
12
a
21
a
22
]
[
T
I
T
O
]
+
[
b
11
b
12
b
21
b
22
]
[
N
I
N
O
]
+
[
c
11
c
12
c
21
c
22
]
[
N
.
I
N
.
O
]
wherein
{dot over (N)} I represents the rotational acceleration of the input member,
{dot over (N)} O represents the rotational acceleration of the output member,
T A represents motor torque for a first torque generating machine,
T B represents motor torque for a second torque generating machine,
T I represents engine input torque to the transmission,
T O is the output torque out of the transmission,
N I is the input speed,
N O is the output speed, and
a 11 , a 12 , a 21 , a 22 , b 11 , b 12 , b 21 , b 22 , c 11 , c 12 , c 21 , and c 22 are known parametric values determined based upon hardware gear and shaft interconnections.
13. Method for controlling a powertrain system including an engine coupled to an input member of an electro-mechanical transmission device including electric machines and an energy storage device connected thereto, the electro-mechanical transmission device operative to transfer power between an input member and an output member of the transmission device and the electric machines and selectively operative in one of a plurality of operating range states, the method comprising:
monitoring an operator torque request and a rotational speed of the output member;
determining an inertial effect of the output member based upon the rotational speed of the output member;
determining an inertial effect of the input member;
determining motor torque outputs from the electrical machines and an engine based upon the inertial effects; and
selecting a preferred operating range state and a preferred input speed of the input member based upon the operator torque request and the inertial effects, said preferred input speed of the input member comprising an engine input speed to the transmission device and selected to compensate for additional power required to one of increase and decrease the input speed of the input member resulting from the inertial effects of the output member and the input member.
14. The method of claim 13 , further comprising determining the inertial effect of the input member for fixed gear operating range states based upon the inertial effect of the output member, parametric values based upon hardware gear and shaft interconnections and the fixed gear mode operating range state.
15. The method of claim 13 , wherein the inertial effect of the output member comprises a change in the output member speed over a predetermined elapsed time period.
16. The method of claim 13 , wherein the inertial effect of the output member comprises a rotational acceleration of the output member and wherein the inertial effect of the input member comprises a rotational acceleration of the input member.
17. Method for controlling a powertrain system including an engine coupled to an input member of an electro-mechanical transmission device including electric machines and an energy storage device connected thereto, the electro-mechanical transmission device operative to transfer power between an input member and an output member and the electric machines and selectively operative in one of a plurality of operating range states, the method comprising:
monitoring an operator torque request and a rotational speed of the output member;
determining an inertial effect of the output member based upon the rotational speed of the output member;
determining an inertial effect of the input member;
determining motor torque outputs from the electrical machines and an engine based upon the inertial effects;
selecting a preferred operating range state based upon the operator torque request and the inertial effects;
monitoring an engine input torque to the transmission;
iteratively determining motor torques for the electric machines based upon the engine input torque, the inertial effects, and the operating range state;
determining a cost for operating at each of the iteratively determined motor torques of the electric machines and the engine input torque for each operating range state;
selecting a preferred cost and corresponding desired operating points based upon the costs for each of the operating range states; and
selecting the preferred operating range state based upon the preferred costs for the operating range states.
18. Method for controlling a powertrain system including an engine coupled to an input member of an electro-mechanical transmission device including electric machines and an energy storage device connected thereto, the electro-mechanical transmission device operative to transfer power between an input member and an output member of the transmission device and the electric machines and selectively operative in one of a plurality of operating range states, the method comprising:
monitoring an operator torque request and a rotational speed of the output member;
determining an inertial effect of the output member based upon the rotational speed of the output member;
determining an inertial effect of the input member;
determining motor torque outputs from the electrical machines and an engine based upon the inertial effects; and
selecting a preferred input speed from the engine to the transmission based upon the operator torque request and the inertial effects, said preferred input speed from the engine selected to compensate for additional power required to one of increase and decrease the input speed of the input member resulting from the inertial effects of the output member and the input member.
19. The method of claim 18 , further comprising determining the inertial effect of the input member for fixed gear operating range states based upon the inertial effect of the output member, parametric values based upon hardware gear and shaft interconnections and the fixed gear mode operating range state.
20. The method of claim 18 , wherein the inertial effect of the output member comprises a change in the output member speed over a predetermined elapsed time period.
21. The method of claim 18 , wherein the inertial effect of the output member comprises a rotational acceleration of the output member and wherein the inertial effect of the input member comprises a rotational acceleration of the input member.