System and method for analyzing fuel for fleet calibration

• US 10,006,398 B2
• Filed: 10/25/2016
• Issued: 06/26/2018
• Est. Priority Date: 10/25/2016
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Atterberry, Nathan P., Engfehr, Matthew J.
• Primary Examiner(s): MOULIS, THOMAS N
• Application Number:
  US15/333,245
• Publication Number:
  US 20180112622A1
• Time in Patent Office: 609 Days
• CPC Class Codes: F02D 2041/141 using a feed-forward control element
• CPC Class Codes: F02D 2200/0611 Fuel type, fuel composition or fuel quality
• CPC Class Codes: F02D 2200/0625 Fuel consumption, e.g. measured in fuel liters per 100 kms or miles per gallon
• CPC Class Codes: F02D 35/023 by determining the cylinder pressure
• CPC Class Codes: F02D 37/02 one of the functions being ignition
• CPC Class Codes: F02D 41/0025 Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
• CPC Class Codes: F02D 41/0027 the fuel being gaseous non-electrical control F02D19/02
• CPC Class Codes: F02D 41/14 Introducing closed-loop corrections
• CPC Class Codes: F02D 41/26 using computer, e.g. microprocessor
• CPC Class Codes: F02D 41/3005 Details not otherwise provided for
• CPC Class Codes: F02D 43/00 Conjoint electrical control of two or more functions, e.g. ignition, fuel-air mixture, recirculation, supercharging or exhaust-gas treatment

Abstract

A control system for a multiple fuel internal combustion engine on a vehicle in a fleet of vehicles may include at least one gas analyzer configured to monitor real-time characteristics of gaseous fuel being supplied to the engine, a fleet management data monitoring module, and a cylinder pressure sensor associated with each cylinder of the engine. The control system may further include a data collection module configured to receive real-time fuel characteristics measurements from the gas analyzer, fleet data characteristic of one or more operational parameters, fuel usage, and performance results for vehicles in the fleet, and cylinder pressure measurements from each of the cylinder pressure sensors. An engine electronic control module may calculate one or more actual combustion parameter values from the real-time cylinder pressure measurements, assign weights to fuel characteristics data, cylinder pressure data, and fleet management data, and control at least one of fuel injection and ignition timing based on the weighted data and any difference between calculated actual combustion parameter values for each cylinder and predetermined combustion parameter values.

Claims

1. A control system for a multiple fuel internal combustion engine on a machine in a fleet of machines, the control system comprising:

a gas analyzer configured to monitor in real-time one or more characteristics of a gaseous fuel being supplied to the engine;

a fleet management data monitoring module;

a cylinder pressure sensor associated with one or more cylinders of the engine;

a data collection module configured to receive;

real-time fuel characteristics measurements from the gas analyzer;

fleet management data characteristic of one or more operational parameters, fuel usage, and performance results for machines in the fleet; and

real-time cylinder pressure measurements from the cylinder pressure sensors; and

an engine electronic control module configured to;

calculate one or more actual combustion parameter values from the real-time cylinder pressure measurements;

compare the calculated one or more actual combustion parameter values for each cylinder to predetermined combustion parameter values to determine any difference therebetween, wherein the predetermined combustion parameter values are derived independently from any actual combustion parameter values based on real-time sensor measurements;

assign weights to fuel characteristics data, cylinder pressure data, and fleet management data; and

control at least one of fuel injection of the gaseous fuel and ignition timing based on the weighted data and any difference between the calculated actual combustion parameter values for each cylinder and the predetermined combustion parameter values.

2. The control system of claim 1, wherein the engine electronic control module is further configured to receive the predetermined combustion parameter values from a memory storage.

3. The control system of claim 2, wherein the predetermined combustion parameter values from the memory storage are combustion parameter values based on a theoretical power output that the multiple fuel internal combustion engine can produce with the same types and quantities of fuel as are currently being combusted by the engine while staying within allowable stress limits for the engine.

4. The control system of claim 2, wherein the predetermined combustion parameter values from the memory storage are combustion parameter values based on a theoretical amount of emissions that the multiple fuel internal combustion engine will produce with the same types and quantities of fuel as are currently being combusted by the engine.

5. The control system of claim 1, wherein the calculated one or more actual combustion parameter values and the predetermined combustion parameter values include one or more of peak cylinder pressure, indicated mean effective pressure (IMEP), maximum heat released, crank angle of start of combustion, crank angle of center of combustion, and crank angle of opening or closing of an inlet or outlet valve for each of the cylinders of the multiple fuel internal combustion engine.

6. The control system of claim 5, wherein the predetermined combustion parameter values are combustion parameter values based on a theoretical power output that the multiple fuel internal combustion engine can produce with the same types and quantities of fuel as are currently being combusted by the engine.

7. The control system of claim 1, wherein the engine electronic control module is further configured to control the timing of one or more of fuel injection of at least two different types of fuel and ignition of the at least two different types of fuel.

8. The control system of claim 1, further including the engine electronic control module being configured to recalculate one or more actual combustion parameter values from new real-time cylinder pressure measurements taken after the engine electronic control module controls fuel injection of at least two different types of fuel in order to reduce any difference between the calculated actual combustion parameter values for each cylinder and the predetermined combustion parameter values, the recalculation by the engine electronic control module continuing in a closed loop process until the difference between the calculated actual combustion parameter values and the predetermined combustion parameter values is less than a predetermined threshold.

9. The control system of claim 1, wherein the engine electronic control module is further configured to receive the predetermined combustion parameter values from a calculation module configured to calculate the predetermined combustion parameter values using known, physics-based calculations based on the physical parameters of the engine, real-time characteristics of the fuel, and known thermodynamics of the combustion process for each type of fuel being used by the multiple fuel internal combustion engine.

10. A multiple fuel internal combustion engine in a machine of a fleet of machines, the engine operable in a combined liquid and gaseous fuel mode, comprising:

a plurality of cylinders;

a real-time cylinder pressure sensor associated with each of the plurality of cylinders;

a gas composition and quality sensor associated with a supply of the gaseous fuel;

a fleet management data collection module;

a cylinder liner temperature sensor associated with each of the plurality of cylinders;

a liquid fuel injection system;

a gaseous fuel injection system; and

a control system, the control system comprising;

a data collection module configured to receive real-time cylinder pressure measurements from each of the cylinder pressure sensors, calculate one or more actual combustion parameter values from the real-time cylinder pressure measurements, receive fleet management data, and assign weights to fuel composition and quality data, cylinder pressure data, cylinder liner temperature data, and fleet management data;

an engine electronic control module configured to receive the calculated one or more actual combustion parameter values from the data collection module and compare the calculated one or more actual combustion parameter values for each cylinder to predetermined combustion parameter values to determine any difference therebetween, wherein the predetermined combustion parameter values are derived independently from any actual combustion parameter values based on real-time sensor measurements; and

a process control module configured to control fuel injection of the fuel supplied to each cylinder based on the weighted data and any difference between the calculated actual combustion parameter values for each cylinder and the predetermined combustion parameter values.

11. The multiple fuel internal combustion engine of claim 10, wherein the engine electronic control module is further configured to receive the predetermined combustion parameter values from a memory storage.

12. The multiple fuel internal combustion engine of claim 11, wherein the predetermined combustion parameter values from the memory storage are combustion parameter values based on a theoretical power output that the multiple fuel internal combustion engine can produce with the same types and quantities of fuel as are currently being combusted by the engine while staying within allowable stress limits for the engine.

13. The multiple fuel internal combustion engine of claim 11, wherein the predetermined combustion parameter values from the memory storage are combustion parameter values based on a theoretical amount of emissions that the multiple fuel internal combustion engine will produce with the same types and quantities of fuel as are currently being combusted by the engine.

14. The multiple fuel internal combustion engine of claim 10, wherein the calculated one or more actual combustion parameter values and the predetermined combustion parameter values include one or more of peak cylinder pressure, indicated mean effective pressure (IMEP), maximum heat released, crank angle of start of combustion, crank angle of center of combustion, and crank angle of opening or closing of an inlet or outlet valve for each of the cylinders of the engine.

15. The multiple fuel internal combustion engine of claim 14, wherein the predetermined combustion parameter values are combustion parameter values based on a theoretical power output that the multiple fuel internal combustion engine can produce with the same types and quantities of fuel as are currently being combusted by the engine while staying within allowable stress limits for the engine.

16. The multiple fuel internal combustion engine of claim 10, wherein the process control module is further configured to control the timing of one or more of fuel injection of at least two different types of fuel and ignition of the at least two different types of fuel.

17. The multiple fuel internal combustion engine of claim 10, further including the data collection module being configured to recalculate one or more actual combustion parameter values from new real-time cylinder pressure measurements taken after the process control module controls one or more of fuel injection and ignition in order to reduce any difference between the calculated actual combustion parameter values for each cylinder and the predetermined combustion parameter values, the recalculation by the data collection module continuing in a closed loop process until the difference between the calculated actual combustion parameter values and the predetermined combustion parameter values is less than a predetermined threshold.

18. The multiple fuel internal combustion engine of claim 10, wherein the engine electronic control module is further configured to receive the predetermined combustion parameter values from a calculation module configured to calculate the predetermined combustion parameter values using known, physics-based calculations based on physical parameters of the engine, real-time characteristics of the fuel, and known thermodynamics of a combustion process for each type of fuel being used by the multiple fuel internal combustion engine.

19. A method for controlling a multiple fuel internal combustion engine operable in at least a combination liquid and gaseous fuel mode, the method comprising:

receiving real-time fuel composition and quality data;

receiving real-time in-cylinder pressure measurement data;

receiving real-time cylinder liner temperature measurement data from each of the cylinders of the multiple fuel internal combustion engine;

calculating one or more actual combustion parameter values based on the real-time measurement data;

receiving fleet management data related to overall global operating parameters and customer preferences associated with a plurality of machines that each include one or more of the multiple fuel internal combustion engines;

assigning weights to the real-time data and the fleet management data;

comparing the calculated actual combustion parameter values for each cylinder to predetermined combustion parameter values to determine any difference therebetween, wherein the predetermined combustion parameter values are derived independently from any actual combustion parameter values based on real-time sensor measurements; and

controlling one or more of fuel injection of at least a liquid fuel and a gaseous fuel, and ignition based at least in part on the weighted data and any difference between the calculated actual combustion parameter values for each cylinder and the predetermined combustion parameter values.

20. The method of claim 19, wherein the predetermined combustion parameter values are combustion parameter values based on a theoretical power output that the multiple fuel internal combustion engine can produce with the same types and quantities of fuel as are currently being combusted by the engine while staying within allowable stress limits for the engine.