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.
Claims20
A method for operating a machine, comprising:
- determining, by a controller, an exhaust temperature of an engine operatively connected to:
- a parasitic load, and
- one of a continuously variable transmission (CVT) or a hybrid transmission,
- the parasitic load being operatively connected to an implement of the machine;
- determining, by the controller, a target increase to the exhaust temperature of the engine based on the exhaust temperature of the engine failing to satisfy an exhaust temperature threshold;
- determining, by the controller, a target increase to a torque output of the engine based on the target increase to the exhaust temperature of the engine,
- the target increase to the torque output of the engine corresponding to a target implement power;
- 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 increasing a stroke rate of the parasitic load,
- the parasitic torque being increased without increasing a stroke rate of the engine.
A device, comprising:
- a controller configured to:
- determine an exhaust temperature of an engine operatively connected to:
- a parasitic load, and
- one of a continuously variable transmission (CVT) or a hybrid transmission,
- the parasitic load being operatively connected to an implement of a machine;
- determine a target increase to the exhaust temperature based on the exhaust temperature of the engine failing to satisfy an exhaust temperature 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 of the engine,
- the target increase to the torque output of the engine corresponding to a target implement power;
- and
- cause a parasitic torque of the engine to be increased, based on the target increase to the torque output, by increasing a stroke rate of the parasitic load,
- the parasitic torque being increased without increasing a stroke rate of the engine.
A system comprising:
- an engine;
- an electrohydraulic pump operatively connected to the engine and an implement;
- and
- a controller configured to:
- determine an exhaust temperature of the engine;
- determine a target increase to a torque output of the engine based on the exhaust temperature of the engine failing to satisfy an exhaust temperature threshold,
- wherein the target increase to the torque output of the engine corresponds to a target implement power, and
- wherein the target increase to the torque output of the engine is based on a difference between the exhaust temperature of the engine and the exhaust temperature 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,
- the parasitic torque being increased without increasing a stroke rate of the engine.
Dependencies are inferred from the claim text.