Exhaust temperature maintenance using a parasitic load
AssigneeCaterpillar Inc.
InventorsSuman GOLI, SriVidya Lavanya KAMISETTY
Life of this patent
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Abstract
A power system is disclosed. The power system may include one or more memories and a controller. The controller may determine an exhaust temperature of an engine associated with a continuously variable transmission or a hybrid transmission. The controller may determine a target increase to the exhaust temperature based on the exhaust temperature failing to satisfy a threshold. The controller may determine, based on a lookup table, a target increase to a torque output of the engine based on the target increase to the exhaust temperature. The controller may cause a parasitic torque of the engine to be increased based on the target increase to the torque output.
Claims21
A method, comprising:
- determining, by a controller, an exhaust temperature of an engine associated with a continuously variable transmission (CVT) or a hybrid transmission of a machine;
- determining, by the controller, a target increase to the exhaust temperature based on the exhaust temperature of the engine failing to satisfy a threshold;
- determining, by the controller, a target increase to a torque output of the engine based on the target increase to the exhaust temperature;
- and
- causing, by the controller and based on the target increase to the torque output, a parasitic torque of the engine to be increased by causing a stroke rate of a first pump, of the machine, to be increased,
- the first pump being separate from a second pump, of the machine, that powers a driving element of the machine.
A device, comprising:
- one or more memories;
- and
- a controller to:
- determine an exhaust temperature of an engine associated with a continuously variable transmission (CVT) or a hybrid transmission of a machine;
- determine a target increase to the exhaust temperature based on the exhaust temperature failing to satisfy a threshold;
- determine, based on a lookup table, a target increase to a torque output of the engine based on the target increase to the exhaust temperature;
- and
- cause a parasitic torque of the engine to be increased, based on the target increase to the torque output, by causing a stroke rate of a first pump, of the machine, to be increased,
- the first pump being separate from a second pump, of the machine, that powers a driving element of the machine.
A system comprising:
- an engine;
- an electrohydraulic pump;
- a different pump that powers a driving element;
- and
- a controller to:
- determine an exhaust temperature of the engine;
- determine a target increase to a torque output of the engine based on the exhaust temperature failing to satisfy a threshold, wherein the target increase to the torque output is based on a difference between the exhaust temperature and the threshold;
- and
- cause a parasitic torque of the engine to be increased to satisfy the target increase to the torque output by providing a command to increase a stroke rate of the electrohydraulic pump.
(canceled)
Dependencies are inferred from the claim text.