Back to results
US 9,518,497 B2Granted
System and method for determining the net output torque from a waste heat recovery system
AssigneeCummins Inc.
InventorsChristophe Tricaud, Timothy C. Ernst, James A. Zigan
Life of this patent
Estimating the term…
Abstract
The disclosure provides a waste heat recovery system with a system and method for calculation of the net output torque from the waste heat recovery system. The calculation uses inputs from existing pressure and speed sensors to create a virtual pump torque sensor and a virtual expander torque sensor, and uses these sensors to provide an accurate net torque output from the WHR system.
Claims18
A method of determining a net output torque from a waste heat recovery system of an internal combustion engine, the method comprising:
- receiving, via a fluid circuit, a high pressure value corresponding to fluid pressure on a high pressure side of the fluid circuit of a waste heat recovery system of an internal combustion engine, the high pressure value being from a first pressure sensor;
- receiving, via the fluid circuit, a low pressure value corresponding to fluid pressure on a low pressure side of the fluid circuit of the waste heat recovery system, the low pressure value being from a second pressure sensor;
- receiving an engine speed value, the engine speed value being from an engine speed indicator;
- determining, by engine control circuitry, an energy conversion device output torque of an energy conversion device of the waste heat recovery system based on the high pressure value, the low pressure value, and the engine speed value;
- determining, by the engine control circuitry, a pump output torque of a pump component of the waste heat recovery system based on the high pressure, the low pressure value, and the engine speed value;
- calculating a net output torque from the waste heat recovery system based on a difference between the energy conversion device output torque and the pump output torque;
- and
- based on the net output torque from the waste heat recovery system, controlling a shift point in a transmission driven by the internal combustion engine.
5 more elements
An internal combustion engine system, comprising:
- a waste heat recovery system comprising:
- a condenser structured to operate on a working fluid;
- a feed pump fluidly coupled to the condenser and positioned downstream of the condenser so as to receive at least a portion of the working fluid from the condenser;
- a heat exchanger fluidly coupled to the feed pump downstream of the condenser so as to receive the at least a portion of the working fluid from the pump, the heat exchanger including a waste heat fluid circuit;
- an energy conversion device fluidly coupled to the heat exchanger so as to receive the at least a portion of the working fluid from the heat exchanger, the energy conversion device fluidly coupled to the condenser;
- a high pressure sensor positioned upstream of the energy conversion device and configured to determine a high pressure value of the working fluid upstream of the energy conversion device;
- a low pressure sensor positioned downstream of the energy conversion device and configured to determine a low pressure value of the working fluid downstream of the energy conversion device;
- an internal combustion engine fluidly coupled to the waste heat fluid circuit of the heat exchanger;
- an engine speed sensor configured to determine an engine speed value of the internal combustion engine;
- and
- a net torque calculator of an engine controller associated with the internal combustion engine configured to determine a net output torque from the waste heat recovery system based on a difference between an energy conversion device output torque and a pump output torque, the energy conversion device output torque and the pump output torque determined based on the high pressure value, the low pressure value, and the engine speed value.
8 more elements
A waste heat recovery system net output torque control system comprising:
- an energy conversion device output torque module configured to determine an energy conversion device output torque of an energy conversion device of a waste heat recovery system based on:
- a determination, via a high-pressure sensor, of a high pressure value of a high pressure side of a fluid circuit of the waste heat recovery system;
- a determination, via a low-pressure sensor, of a low pressure value of a low pressure side of the fluid circuit of the waste heat recovery system;
- and
- a determination, via an engine speed indicator, of an engine speed value of an internal combustion engine in fluid communication with the waste heat recovery system;
- a pump output torque module circuit configured to determine a pump output torque of a pump component of the waste heat recovery system based on the determination of the high pressure value, the low pressure value, and the engine speed value;
- a net torque module configured to determine a net output torque from the waste heat recovery system based on a difference between the energy conversion device output torque and the pump output torque;
- and
- a transmission shift module configured to control a shift point in a transmission driven by the internal combustion engine based on the net output torque being determined.
6 more elements
Dependencies are inferred from the claim text.