Control architecture for a multi-mode powertrain system
View Patent ↗A controller architecture for a vehicle including a multi-mode powertrain system includes an engine controller having a control routine for determining and executing engine torque commands responsive to a hybrid engine torque command, and a control routine for determining a propulsion axle torque command responsive to an output torque request. The controller architecture further includes transmission controller having a control routine for selecting and effecting operation of the passive transmission in a preferred gear responsive to the output torque request. The controller architecture further includes a hybrid controller having control routines for determining and executing torque commands for each of the non-combustion torque machines and for determining the hybrid engine torque command to achieve a desired axle torque in response to the propulsion axle torque command with the passive transmission operating in the preferred gear.
1. A control architecture for a vehicle comprising a multi-mode powertrain system including an internal combustion engine mechanically coupled to a single input member of a passive transmission having a single output member, the architecture comprising:
a primary drive wheel, exclusively driven via a mechanical coupling to the single output member;
a first non-combustion torque machine mechanically coupled to one of the internal combustion engine, the single input member, and the single output member;
a secondary drive wheel exclusively driven via a mechanical coupling to a second non-combustion torque machine;
an engine controller operatively connected to the internal combustion engine, including a control routine for determining and executing engine torque commands responsive to a hybrid engine torque command, and a control routine for determining a propulsion axle torque command responsive to an output torque request;
a transmission controller operatively connected to the passive transmission, including a control routine for selecting and effecting operation of the passive transmission in a preferred gear responsive to the output torque request; and
a hybrid controller operatively connected to the non-combustion torque machines, including
a control routine for determining an axle torque split between the primary drive wheel and the secondary drive wheel responsive to the propulsion axle torque command and comprising a primary axle torque command and a secondary axle torque command,
a control routine for determining a crankshaft torque command in response to the primary axle torque command and the preferred gear of the passive transmission,
a control routine for subjecting the crankshaft torque command to a crankshaft torque split between the engine and the first non-combustion torque machine,
a control routine for determining the hybrid engine torque command responsive to the crankshaft torque split,
a control routine for controlling the first non-combustion torque machine responsive to the crankshaft torque split, and
a control routine for controlling the second non-combustion torque machine responsive to the secondary axle torque command.
2. The control architecture of claim 1 , wherein the first non-combustion torque machine is mechanically coupled to a crankshaft of the internal combustion engine.
3. The control architecture of claim 1 , wherein the first non-combustion torque machine is mechanically coupled to the single input member of the passive transmission.
4. The control architecture of claim 1 , further comprising a control routine to subject the crankshaft torque to crankshaft torque arbitration, taking into account engine start/stop operation, transmission shift control and engine idle control.
5. The control architecture of claim 1 , wherein the hybrid controller further includes a minimum axle torque routine to determine a minimum axle torque limit that is sent to the engine controller to communicate regenerative braking limitations and stall prevention limitations.
6. The control architecture of claim 1 , wherein the first non-combustion torque machine is mechanically coupled to the internal combustion engine.