WO2001084090A1 - Systeme d'optimisation de carburant dote d'un detecteur ameliore du niveau de carburant - Google Patents

Systeme d'optimisation de carburant dote d'un detecteur ameliore du niveau de carburant Download PDF

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Publication number
WO2001084090A1
WO2001084090A1 PCT/US2001/010089 US0110089W WO0184090A1 WO 2001084090 A1 WO2001084090 A1 WO 2001084090A1 US 0110089 W US0110089 W US 0110089W WO 0184090 A1 WO0184090 A1 WO 0184090A1
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WO
WIPO (PCT)
Prior art keywords
fuel
value
percentage
vehicle
capacity value
Prior art date
Application number
PCT/US2001/010089
Other languages
English (en)
Inventor
Lawrence B. Reimer
Original Assignee
Ssi Technologies, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US09/562,225 external-priority patent/US6484088B1/en
Application filed by Ssi Technologies, Inc. filed Critical Ssi Technologies, Inc.
Publication of WO2001084090A1 publication Critical patent/WO2001084090A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
    • G01C21/34—Route searching; Route guidance
    • G01C21/3453—Special cost functions, i.e. other than distance or default speed limit of road segments
    • G01C21/3469—Fuel consumption; Energy use; Emission aspects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/077—Fuel tanks with means modifying or controlling distribution or motion of fuel, e.g. to prevent noise, surge, splash or fuel starvation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/06—Fuel tanks characterised by fuel reserve systems
    • B60K15/061—Fuel tanks characterised by fuel reserve systems with level control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/0321—Fuel tanks characterised by special sensors, the mounting thereof
    • B60K2015/03217—Fuel level sensors

Definitions

  • the present invention relates to systems for monitoring the fuel level in a vehicle.
  • the present invention relates to a system for optimizing refueling of a vehicle, reducing refueling fraud, and providing enhanced fuel information.
  • Vehicles such as tractor-trailer trucks transport enormous amounts of freight around the globe. Each year these trucks travel millions of miles and consume a correspondingly large amount of fuel. Because just one truck can consume tens of thousands of dollars in fuel, fuel costs make up a significant portion of the operating budget of trucking companies.
  • analog fuel sensors are electro-mechanical float devices that suffer from at least two deficiencies. First, they must be calibrated to the size of the tank in which they are installed. Second, they often register inaccurate readings due to changes in tank orientation such as might occur on inclines or when the vehicle rides over bumps. Of course, these devices provide only one type of information, a measurement of the percentage of fuel remaining in the tank: such as F, 3 / 4 , Vz ⁇ V ⁇ , E. Information such as the actual number of gallons remaining or the number of miles until the tank will be empty is not provided.
  • the present invention provides a system for monitoring fuel consumption and optimizing refueling of a vehicle.
  • the system includes a fuel level sensor designed to be mounted on a fuel tank.
  • the fuel level sensor has a transducer, such as an ultrasonic transducer, for generating a distance signal that represents the distance between the sensor and the surface of the fuel in the fuel tank.
  • a processor is coupled to the transducer, and is programmed to convert the distance signal to a percentage of capacity signal, calculate the volume of fuel within the fuel tank, and create a message that includes information regarding the volume of fuel in the fuel tank.
  • the processor of the fuel level sensor is coupled to a vehicle information system that may include information buses and modules such as an on-board computer.
  • the vehicle information system provides the processor with various data including the distance traveled by the vehicle.
  • the processor is coupled through a network to a fuel optimization server that calculates an optimal location for refilling the fuel tank using the message created by the fuel level sensor, data provided by the vehicle information system, and information it receives from a fuel-price-by location service, and a dispatch terminal.
  • the fuel optimization server relays the optimal location for refueling to the vehicle information system and a display or computer coupled to the vehicle information system then displays the refueling information to inform the driver when and where to refuel.
  • Other non-fuel related information (such as engine performance data from the Jl 587 bus) can also be transmitted from the vehicle to the dispatch terminal to allow scheduling of routine maintenance or detection of developing engine problems.
  • the computing power of the invention permits the generation of numerous other types of fuel-related information.
  • the processor may be programmed to calculate a signal indicative of the number of miles-to-empty (hereinafter "miles-to-empty signal”), and provide that miles-to-empty signal to the dispatch terminal as well as to the vehicle driver.
  • miles-to-empty signal a signal indicative of the number of miles-to-empty
  • This type of information provides drivers more flexibility to plan refueling stops than standard fuel measurement systems which, in general, merely display the amount of fuel remaining in a tank on an analog gauge mounted in the vehicle.
  • Another feature of the present invention is that it measures and calculates fuel- related information with a level of accuracy not achieved heretofore.
  • the fuel level sensor used in the system may include a vehicle-speed-dependent filter to reduce the measurement affects of standing waves in the fuel tank caused by vehicle motion.
  • Another interesting feature of the present invention is that it may automatically calculate the size of the fuel tank with which it is used.
  • a percentage of capacity value is acquired from a fuel level sensor mounted on the fuel tank.
  • a total fuel capacity value that has been preprogrammed into the sensor is retrieved from memory.
  • the sensor calculates a total fuel capacity value.
  • a fuel economy value is then calculated.
  • a fuel remaining value is determined by multiplying the percentage of capacity value by the total fuel capacity value.
  • a miles-to-empty value is determined by multiplying the fuel remaining value by the fuel economy value.
  • a miles-to-empty value may be determined based on the vehicle distance traveled.
  • Still other methods relate to calculating the size of a fuel tank based on the distance traveled by the vehicle or the relative hours of fuel consumption and the fuel flow rate. Additional methods taught by the invention include determining the hours until the tank is empty, identifying a leak in a tank, and identifying refueling fraud.
  • FIG. 1 is a block diagram of a fuel optimization system embodying the invention.
  • FIG. 2 is a block diagram of another embodiment of the fuel optimization system.
  • FIG. 3 is a block diagram of another embodiment of the fuel optimization system.
  • FIG. 3 A is a block diagram of another embodiment of the fuel optimization system.
  • FIG. 4 is a perspective view of a fuel level sensor embodying the invention.
  • FIG. 5 is a cross-sectional view of the fuel level sensor of FIG. 4 taken along the line 5-5.
  • FIG. 6 is a block diagram of the control circuitry for the fuel level sensor of FIGS. 4 and 5.
  • FIG. 7 is a schematic illustration of the measurement made by the fuel sensor of FIGS. 4 and 5.
  • FIG. 8 is a circuit diagram of the micro-controller shown in FIG. 6.
  • FIG. 8 A is a circuit diagram of the analog driving circuit shown in FIG. 6.
  • FIG. 8B is a circuit diagram of a second embodiment of the micro-controller shown in FIG. 6.
  • FIG. 8C is a circuit diagram of second embodiment of the analog driving circuit shown in FIG. 6.
  • FIG. 8D is a circuit diagram of a third embodiment of the processor shown in FIG. 6.
  • FIG. 9 is a flow chart of the top-level architecture of the software run on the processor of the fuel level sensor of FIGS. 4 and 5.
  • FIG. 10 is a flow chart of the initialization sequence implemented by the software of the fuel level sensor.
  • FIG. 11 is a flow chart of the calibration process implemented by the software of the fuel level sensor.
  • FIG 11 A is a flowchart of the error handling process implemented by the software of the fuel level sensor.
  • FIG. 12 is a flow chart of the background process implemented by the software of the fuel level sensor.
  • FIG. 13 is a flow chart of the command processing implemented by the software of the fuel level sensor.
  • FIG. 14 is a flow chart of the interrupt handler implemented by the software of the fuel level sensor.
  • FIG. 15 is a flowchart of the pulse send and receive routine implemented by the software of the fuel level sensor.
  • FIG. 16 is a flow chart of the maintenance processing implemented by the software of the fuel level sensor.
  • FIG. 17 is flow chart of the median filtering implemented by the software of the fuel level sensor.
  • FIG. 18 is a flow chart of the finite impulse response filtering implemented by the software of the fuel level sensor.
  • FIG. 19 is a flow chart of the conversion process implemented by the software of the fuel level sensor.
  • FIG. 20 a flow chart of the message transmission process implemented by the software of the fuel level sensor.
  • FIG. 21 is a flow chart of the temperature processing implemented by the software of the fuel level sensor.
  • FIG. 22 is a flow chart of the bus transmission process implemented by the software of the fuel level sensor.
  • FIG. 23 is a block diagram of an embodiment of the invention configured to monitor fraudulent re-fueling activities.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A system 25 embodying the invention is shown in FIG. 1.
  • the system includes a vehicle 27 (such as a tractor-trailer truck) equipped with a fuel sensor 29, and a vehicle information system 31.
  • vehicle information system refers to the sensors, processors, and communication links present in the vehicle 27.
  • a modem vehicle may include brake sensors, engine sensors, transmission sensors, other sensors, and a GPS (global positioning system) unit. Each of these devices may communicate with controllers or modules designed to control or monitor various aspects of vehicle operation on a vehicle bus or network.
  • the modules may communicate with each other on the same bus or network.
  • the invention is compatible with present bus and network communication schemes so that it may exchange information with the vehicle information system.
  • communication schemes are changed in the future it is envisioned that the invention could be readily updated by those of ordinary skill in the art to work with such improvements.
  • vehicle information system technology is known, the details of the vehicle information system 31 are not discussed in detail.
  • the vehicle information system 31 is coupled to an electronic dash display 33, and to a transmitter/receiver or transponder 34.
  • the transponder 34 is coupled to a network 35, such as a satellite network. As shown in FIG. 1, the network 35 includes a ground station 36 and message center 37.
  • the message center 37 receives information from the fuel level sensor 29 and vehicle information system 31 on the vehicle 27 via the network 35.
  • the message center 37 delivers information such as vehicle status and location to a dispatch terminal 39 through a second network 38.
  • the term "dispatch terminal” is used to refer to a node or location, without regard to any physical structure, that is capable of providing the functions described herein as being associated with a dispatch terminal.
  • the dispatch terminal 39 could correspond to an actual dispatch terminal of a tracking company, but the expression is not to be limited to such a specific example.
  • the message center 37 also relays information such as fuel quantity, location, fuel economy, and fuel tank size to a fuel optimization server 41 through a third network 42.
  • the dispatch terminal 39 determines vehicle routing information based on the information it receives from the message center 37.
  • the fuel optimization server 41 receives routing information from the dispatch terminal 39 through a fourth network 43.
  • the fuel optimization server 41 also receives fuel-price-by-location information through a fifth network 45 from one or more fuel-price-by-location services 46 and 47, such as the service offered by Opis Transportation through its site at www.opisretaildiesel.com.
  • the second network 38, third network 42, fourth network 43, and fifth network 45 are meant to encompass communications links in general, including telephone, wireless, Internet, and various other connection mechanisms.
  • FIG. 2 A second embodiment of the invention is shown in FIG. 2.
  • the embodiment of FIG. 2 is based on a cellular or wireless communications system.
  • the vehicle 27 is equipped with a vehicle PC (computer) and electronic dash unit 50, preferably equipped with a GPS navigation system, and a cellular modem 51 that is coupled to a cellular system 52.
  • the cellular system 52 is linked to an Internet service provider ("ISP") 53.
  • ISP Internet service provider
  • the fuel optimization server 41 and ISP 53 exchange information through a link 54.
  • FIG. 3 shows yet another embodiment of the invention where the functionality of the fuel optimization server is provided within the dispatch terminal 39.
  • FIG. 3 shows yet another embodiment of the invention where the functionality of the fuel optimization server is provided within the dispatch terminal 39.
  • the system 25 is designed to collect information regarding the fuel level in a vehicle fuel tank (not shown) using the fuel level sensor 29.
  • the fuel level sensor 29 places that information on a vehicle bus and the information is transmitted to other components in the system.
  • the fuel optimization server 41 monitors the vehicle 27 for a low fuel message and monitors the dispatch terminal 39 for a dispatch command. In response to either of these messages, the system interrogates the fuel level sensor 29 for tank capacity, fuel quantity, and fuel economy information.
  • the fuel optimization server 41 Based on the information provided by the fuel level sensor, the current routing dispatch generated by the dispatch terminal 39, fuel price information from the fuel-price-by-location service provider 46 or 47, tax information, and preference information the fuel optimization server 41 develops an optimal routing, refueling location or locations, refueling quantity, and direction (or heading) listing for the driver of the vehicle 27.
  • the listing of information is transferred to the vehicle 27 and displayed on the dash or vehicle PC display for viewing by the driver.
  • the fuel level sensor 29 includes a main housing 60 that contains a circuit board assembly 62 with a processor (discussed below).
  • the processor communicates (sends and receives information) with the vehicle information system 31 through a cable assembly 64 inserted through an opening 66 of the main housing 60.
  • the main housing 60 is mounted on a base housing 68 which holds a transducer 70 that is coupled to the processor (discussed below) on the circuit board assembly 62 through a communication link 72.
  • the base housing is designed to be inserted into an opening in the vehicle fuel tank (not shown) and includes a tank seal gasket 74 to help ensure a liquid tight seal between the opening and the sensor 29.
  • the main function of the fuel level sensor is to determine the amount of fuel remaining in the fuel tank of the vehicle 27.
  • a circuit assembly or system 90 within the sensor that accomplishes this and other tasks is shown in FIG. 6.
  • the system 90 includes a micro-controller or processor 92 (that, although not shown, is mounted on the circuit board assembly 62.)
  • the processor 92 sends a command signal to a transmitter 94.
  • the transmitter in turn sends a pulse signal to the transducer 70, which converts the electric pulse signal to a short pulse of sound PS (FIG. 7).
  • the pulse of sound PS is reflected off the surface S of the fuel in the fuel tank (not shown) of the vehicle 27.
  • the return of the pulse of sound is sensed by a receiver 96 (FIG.
  • the processor 92 processes the TOF measurement and generates a digital output on lines 98 that are coupled to the vehicle information system 31. Ultimately, the output is transmitted as a message or messages to the dispatch terminal 39.
  • the processor 92 also generates a signal, preferably a pulse-width modulated (PWM signal) representative of the fuel level in the fuel tank. This signal is sent along link 100 to an amplifier 104 that drives a standard analog fuel gauge (not shown).
  • PWM signal pulse-width modulated
  • the processor 92 may be implemented in multiple forms.
  • the processor's main function is to execute software that carries out the desired fuel calculations and to communicate with other devices in and out of the vehicle.
  • the processor is implemented in a simple and inexpensive form.
  • the processor includes an echo signal or first sub-processor 110.
  • the first sub-processor 110 sends a command signal that drives transmitter 94 over trigger line TRIG, and receives a signal from the receiver 96 over detect line DET.
  • the trigger command is delivered to a transformer driver circuit 112 that controls a transformer 113.
  • the transformer driver circuit 112 supplies a voltage signal across the primary coil of the transformer 113.
  • the voltage signal is stepped up across the secondary coil, rectified by a rectifier 113 A, and output to the transducer across nodes Al and A2.
  • the echo signal from the transducer is delivered to a pre-amplifier 114, which provides suitable input and output impedances, and amplified again through a final amplifier 115.
  • the output of the final amplifier 115 is rectified by a rectifying device 115 A and delivered to a demodulator and detector 116.
  • the demodulator and detector 116 delivers a detect signal representing the echo signal from the transducer to the processor 92 over the DET line.
  • the sub- processor 110 receives a reset signal from a second sub-processor (discussed below) through line CRESET (FIG. 8). Calibration data is received from a memory 118.
  • a temperature sensor 119 provides temperature data to allow the sub-processor 110 to account for changes in the speed of sound caused by fluctuations in the environmental temperature. By accounting for temperature changes, the sub-processor 110 may accurately determine the TOF measurement. Additional information, including input regarding the size of the tank of the vehicle, may be received through the select lines SEL1-SEL3. Once the first sub-processor 110 is reset and calibrated and has received its input data, the sub-processor 110 implements an echo signal processing routine and generates a percentage of capacity signal over the lines DAT0-DAT9. The percentage of capacity signal sent over lines DAT0-DAT9 is processed by a personality or second sub-processor 120. The second sub-processor 120 receives reset commands from a reset controller 121.
  • the second-sub processor may also be programmed with information such as the size of the fuel tank of the vehicle and the configuration of the analog fuel gauge of the vehicle at a vehicle programming station or through another input mechanism.
  • the second sub- processor 120 stores this information in a memory 122 for use in subsequent calculations. These calculations include converting the percentage of capacity information received from the first-sub-processor into other values, such as the number of gallons remaining in the tank.
  • the calculations also involve generating an appropriate signal to drive an analog fuel gauge.
  • the second sub-processor 120 outputs an analog fuel gauge drive signal over the line REO/ALE and generates a digital output along line RA5/TX/CK.
  • the digital output is subsequently encoded (preferably for RS485-type communications) by an encoder/decoder or driver 124.
  • the driver 124 generates an output signal on the line ⁇ DO/R and receives input on the line DO/R.
  • the lines ⁇ DO R and DO R are used to communicate over the data bus in the vehicle information system 31 with the transponder 34 or vehicle PC 50, as the case may be.
  • the processor 92 shown in FIG. 8 and the driving and detection components shown in FIG. 8 A are powered by a power supply (not shown) of conventional design.
  • FIGS. 8B and 8C illustrate a first modified version of the system 90.
  • FIG. 8B illustrates an embodiment of the processor where the sub-processor 120 is operated at a clock speed of 33 MHz, thereby eliminating the need for the 16 MHz oscillator used in the embodiment shown in FIG. 8.
  • FIG. 8C illustrates a modified version of the transducer driver where the pre-amplifier and final amplifier each consists of one-half of an operational amplifier.
  • FIG. 8D illustrates a second modified version of the system 90.
  • the sub-processor 110 and 120 are implemented on a single chip 140, such as a PIC17C44 from Microchip Technology, Inc.
  • the embodiment shown in FIG. 8D may be implemented with the transducer driver shown in FIG. 8C.
  • the processor 92 receives input in the form of reset commands, detection signals from the transducer 70, input regarding tank configuration (such as through select lines), temperature data, and calibration data. After processing this data, the processor 90 generates a signal to drive an analog fuel gauge and a message signal containing fuel level information, which is delivered to the optimization server 41 upon the occurrence of a dispatch command from the dispatch terminal 39 or a low fuel condition.
  • the process begins in the sub-processor 110 with an initialization step 200 where the system is powered-up. Following the initialization step 200, background processing 205 and foreground processing 210 are accomplished.
  • the initialization step 200 involves a hardware reset process beginning with initializing of the processor at 215.
  • the select lines are read at 217 in order to determine whether the processor 92 is in maintenance mode. If the processor 92 is in a maintenance mode, the processor will process a maintenance command in addition to making a measurement. Loading of calibration data occurs at 219. As best seen by reference to FIG. 11 , the calibration data is down loaded from memory at 219 A, and is checked for validity at 219B. If the calibration data is valid, it is stored in RAM at 219C. If the calibration data is invalid or otherwise erroneous, the sub processor 110 executes an error handling routine 221 (FIG. 11 A). First, the sub processor 110 disables the cycle timer interrupt at 221 A.
  • step 22 IB For output to a peripheral device.
  • the sub processor waits for time-out of the watchdog at 221 C and begins initialization again. Once the calibration data is loaded, a diagnostics check is implemented at step 221. System timers are initialized at 223 (FIG.10). Background processing 205 then proceeds.
  • the background processing 205 involves decoding commands at 230.
  • Command signals are delivered through the select lines (SEL C, for example) by a user, if desired, for diagnostic and other maintenance purposes.
  • the software supports several commands such as a read from memory command 232, which involves reading data at 234 and copying the data to a serial transmit buffer at 236. Typically, this command is used to read stored TOF measurements, temperature readings, and calibration parameters.
  • the software also supports a write to memory command 238, that involves copying data to memory at 240, and then writing to memory at 242.
  • a send software number command 246 supports debugging and other programming diagnostics.
  • the processor 92 must receive an enable message 249 before maintenance can be carried out.
  • a disable message 250 is used to terminate maintenance activities.
  • the system 90 is designed such that a foreground service interrupt occurs periodically, such as every 12.5 milliseconds. Once the interrupt is complete, background processing 205 continues. Each time an interrupt occurs foreground processing is carried out. Foreground processing 210 involves four sub-cycles 260, 262, 264, and 266 (FIG.14). On the first interrupt at step 270 (i.e., at the beginning of sub-cycle 260), the processor 92 compensates for temperature changes, the transducer is instructed to send a variable pulse train, the processor 92 decodes the echoes received, and a TOF measurement is recorded. As seen in FIG.
  • the sending and receiving of a pulse involves starting the pulse timer at 270A, sending a variable pulse train to the transducer at 270B, waiting for an echo at 270C, and recording the elapsed time at 270D.
  • the generation of a sound wave and detection of an echo may be done in such a manner to permit near field measurements.
  • the amplitude, number, and frequency of drive pulses are adjusted to compensate for part-to-part variation, ambient conditions (e.g., temperature and humidity), and target composition.
  • the detection for decoding of echoes is accomplished by compensating for transducer ring time and determining the time difference between adjacent echoes.
  • maintenance processing 272 is instituted so that if a maintenance command (such as an enable message command 244) is received, information from the sub-processor will be available in a readily understood format such as RS-232. As shown in FIG. 16, maintenance processing involves formatting steps 272A-272I, where the tank size, temperature, table identification, echo time, filtered echo time, distance, percent of capacity, number of echo detections, and temperature validation information are formatted for maintenance and diagnostic operations.
  • the interrupt returns control to the background processing 205.
  • the TOF measurement may be filtered at step 280 and the power and frequency of the pulse train may be adjusted at step 282, in accordance with the guidelines noted above.
  • the filtering is done continuously.
  • filtering involves saving the TOF measurement at 284A, ordering the accumulated TOF measurement at 284B, and selecting the median value from the ordered buffer at 284C.
  • Filtering may also involve converting the TOF median to a distance measurement at step 286A and performing a weighted exponential multiplication on a predetermined group of past median values, such as the last 52 measurements, at 286B (FIG. 18).
  • the third interrupt i.e., sub-cycle 264 in FIG.
  • the TOF measurement or filtered value (if filtering is used) is converted from inches (the distance measurement) into a percentage of capacity amount, as shown at 290.
  • the conversion process (FIG. 19) involves retrieving the tank configuration at 292, retrieving interpolation values from a stored table at 294 and performing an interpolation based on the tank size and TOF measurement at 296.
  • the percentage of capacity amount is sent to the second sub- controller 110 at a transmission step 300 (FIGS. 14 and 20).
  • the temperature is read at 302 from the sensor 112. Once the temperature is read, the system is readied to read the next temperature at 302B (FIG. 21).
  • the watch dog timer 306 checks system activity. The watch dog timer 306 disables the processor 92 and resets itself if a malfunction is detected.
  • the sub-processor 120 further processes the percentage of capacity amount 290 to forms that are compatible with analog fuel gauges, the vehicle information system 31, and the transponder 34.
  • the sub-processor 120 reads at 320, the percentage of capacity amount 290.
  • the sub-process 120 calculates a duty cycle at 322 and then updates the PWM output to the gauge at 324.
  • the subprocessor 120 processes the percentage of capacity amount 290 for digital use. Specifically, the sub-processor 120 collects and averages a set of percentage of capacity amounts over a predetermined interval, such as ten seconds, in a filter 330.
  • the filtered amount is then converted to a format compatible with vehicle bus protocols (such as J1587) at 331 and output, at 332, to the vehicle information system 31 using a timer 334.
  • the timer 334 is then reset at 336.
  • the filtered amount is also converted, on demand, to a format compatible with the communication link to the extra- vehicular network 35.
  • the filtered amount is converted to a binary value at 340 and then transmitted to the communication link (e.g., transponder 34) with appropriate handshakes, etc., at 344.
  • the processor 92 must receive or gather information from the vehicle information system 31, such as the miles traveled or rate of fuel usage.
  • the processor 92 may also obtain vehicle identity information from the vehicle information system, to assist the dispatch terminal in maintaining records for multiple vehicles.
  • the processor 92 (upon interrogation by the fuel optimization server 41) then transmits the percentage of capacity amount 290 (properly formatted), and other calculated values to the dispatch terminal.
  • the dispatch terminal 39 uses the information provided by the processor 92, information from the fuel price location service 46 or 47, vehicle position and direction data from the vehicle information system 31, and algorithms understood by those of ordinary skill in the art to determine optimal refueling locations and other messages.
  • the refueling and message information is sent back to the vehicle 27 to inform the driver of the optimal refueling location.
  • One data value that the processor determines using the percentage of capacity value 290 is the distance that may be traveled until the fuel tank is empty ("miles-to-empty value").
  • the algorithm implemented by the processor is as follows.
  • the processor 92 reads the fuel capacity of the tank or tanks installed in the vehicle 27. (The capacity of the fuel tank may be programmed into the processor 92 through the data bus or through various select lines.)
  • the processor 92 also calculates an average fuel economy value.
  • the fuel economy value is calculated using a data filter that employs an arithmetic average of the fuel quantity remaining over a short period of time such as 3 to 4 minutes. This helps reduce errors associated with fuel movement in the tank.
  • the processor calculates a miles per gallon or fuel economy value by finding the quotient of the net difference in the measured fuel quantity weighted average versus the net difference in a total vehicle distance value obtained from the vehicle information system.
  • the calculation period for the determination is set at a predetermined time, such as one hour.
  • the processor 92 ignores data received when the vehicle 36 is idling.
  • the processor also ignores data produced as a result of the vehicle traveling a short distance, for example, twenty miles or less.
  • the processor also ignores data produced as a result of the vehicle consuming a minimum amount of fuel, such as three and one-half gallons.
  • the fuel economy value is calculated using a weighted average of sixteen points representing sixteen hours of operation and, once determined, the value is stored in non-volatile memory for use following resets.
  • the processor 92 obtains a vehicle position message and vehicle direction message from the vehicle information system.
  • the vehicle information system may obtain location and direction information from a GPS system in the vehicle.
  • the percentage of capacity value 290 is then multiplied by the capacity of the fuel tank or tanks in the vehicle 27 to yield a fuel remaining value for the tank(s) in the vehicle.
  • the fuel remaining value is multiplied by the average fuel economy value to yield a miles-to-empty value.
  • the fuel quantity remaining, fuel usage rate, fuel tank size, fuel economy value, and vehicle location information are communicated to fuel optimization server 41.
  • the vehicle location, status, and percentage of capacity value, and miles to empty value may also be communicated to the dispatch terminal.
  • the fuel optimization server 41 dials up the fuel- price-by-location service and selects the optimal refueling location based upon the vehicle's position, direction, miles-to-empty value, tax information, preference information (such as a driver preference for divided highways versus two-lane roads), fuel contracts, etc.
  • the location of the optimal refueling location may then be displayed for an operator at the dispatch terminal. The operator may then relay that information, by means of a telephone link, for example, to the vehicle 27.
  • the fuel optimization software generates a message containing the location of the optimal refueling location and transmits it back to dash display 33 or vehicle PC 50 without any human interaction.
  • the dash display 30 or vehicle PC 50 displays the refueling location to the vehicle driver.
  • Additional information may also be displayed to the driver, if appropriate. For example, if the processor 92 determines that the miles-to-empty value is below a predetermined level, such as 200 miles, a low fuel warning message may be broadcast to the dash display 33 or vehicle PC 50.
  • a predetermined level such as 200 miles
  • the fuel tank capacity of the vehicle may be programmed into the dispatch terminal and the processor 92 may periodically retrieve the fuel tank capacity from the dispatch terminal 39. This avoids the need to individually program each system 90 when it is installed in a vehicle. However, a preprogramming step is still required to set up the dispatch terminal and, in many instances, each time the fuel tank capacity is retrieved by the processor 92 from the dispatch terminal, communication charges are incurred.
  • the processor 92 may be programmed to calculate the miles- to-empty value using a ratio-metric approach.
  • the percentage of capacity value 290 and a total vehicle distance traveled value from the vehicle information system may be used to infer the miles-to-empty value. Table 1, below, illustrates the necessary calculations. Table 1
  • the processor 92 broadcasts the miles-to-empty value on the vehicle bus and communicates that value (along with other information obtained from the vehicle information system) to the dispatch terminal. The dispatch terminal then determines the optimal refueling location and that location is relayed back to the vehicle 92. The processor 92 also determines whether the miles-to-empty value is below a predetermined level. If so, the processor 92 broadcasts a warning message to the dash display 33.
  • the miles-to-empty value may be determined without knowing the fuel capacity of the tank(s) in the vehicle 27.
  • the miles-to-empty value obtained through this method is only an estimation.
  • a more accurate determination may be made using a modified form of the method that relies on fuel economy data, which may be calculated as described above.
  • the processor 92 may determine tank size according to the following equation.
  • Tank Size [(Miles/percentage of capacity) x 100]/(Average Fuel Economy) Eqn. 1
  • Table 2 The implementation of the modified algorithm is illustrated in Table 2.
  • the processor 92 may execute additional algorithms to identify leaks in the fuel system.
  • the processor 92 may identify leaks by periodically determining the tank capacity, storing that size in memory, and determining whether a change in the capacity has occurred between measurements. If a significant change has occurred, such as a drop of about 85% or more, a leak condition is likely to exist.
  • the processor 92 may also identify instances of refueling fraud by calculating the amount of fuel in the fuel tank at times when fueling is likely to occur, such as when the vehicle is stationary or at times just after refueling is likely to have occurred, such as upon power up.
  • the processor 92 broadcasts them to the dispatch terminal which stores them for later evaluation against manual log entries recorded by the driver and entered into the dispatch terminal via a man-machine interface, such as a keyboard, touch screen, etc.
  • a diagnostic terminal 400 may be used to determine discrepancies between the values recorded in the dispatch terminal and those recorded by the driver to uncover fuel fraud or theft.
  • the basic ratio-metric algorithm described may also be used to calculate the amount of fuel remaining in the fuel tank of the vehicle.
  • a fuel remaining value may be determined according to Eqn. 3, as shown in Table 3.
  • FQR [(PCV) x (RDCCM/%) x 100]/(AFE) Eqn. 3
  • FQR Fuel Quantity Remaining
  • PCV Percentage of Capacity Value
  • RDCCM Ratio of Distance to a 1% Capacity Change in Miles
  • AFE Average Fuel Economy
  • the processor 92 may perform an hours to empty calculation to determine an hours to empty value. In an hours-to-empty calculation, rather than consider fuel economy in miles per gallon, total fuel used in gallons is considered. Likewise, total engine hours is used in lieu of total mileage. Alternatively, the processor could make the same calculation by monitoring fuel flow rate (described below) in gallons per second and the processor's internal time standard to deduce hours to empty and tank capacity/size.
  • the processor 92 utilizes data from the vehicle information system, as listed in Table 4. Table 4
  • the fuel rate or, more accurately, the average fuel flow rate is the running average of fuel flow.
  • the running average is generated by one of two methods. The first method involves periodically reading (such as every 0.2 seconds) the fuel rate provided by the vehicle information system and averaging that number over a sufficient period of time (such as between 1 and 5 minutes) or by any other averaging scheme that eliminates short-term variability caused by rapid throttle changes. The average (regardless of how determined) multiplied by 3600 is equal to the average fuel flow rate in gallons per hour.
  • the second method involves periodically reading the total fuel used and the total engine hours from the vehicle information system and adding the quantities to previously read quantities from previous time periods.
  • a suitable period is between 1 and 5 minutes or any other time sufficient to eliminate short-term variability caused by rapid throttle changes.
  • the net fuel used divided by the net engine hours yields the average fuel flow rate in gallons per hour.
  • Determining the hours to empty value is particularly useful for off-road applications of the system 25 such as at large construction sites, mines, landfills, and the like where vehicles are run for long periods of time on a regular basis and require frequent refueling. In these instances, it is not necessary to determine the optimal location for refueling, but the timing of refueling can be optimized so that vehicles remain in operation for the longest period of time possible.
  • the processor 92 calculates the fuel remaining value in gallons by multiplying the percentage of capacity value by the fuel capacity of the tank(s) in the vehicle. The fuel remaining value is then divided by the average fuel flow rate to yield an hours to empty value.
  • the processor 92 generates a warning message when the hours to empty value drops below a predetermined level, such as five hours, and displays a warning message to the driver on the dash display 33.
  • the processor may or may not be linked to a dispatch terminal.
  • a modified version of the system 25 could be created where the dispatch terminal is used to record information, without linking to a fuel-price-by-location service, and to inform an operator at the dispatch terminal of vehicle conditions.
  • the percentage of capacity value, hours to empty value, vehicle location, and fuel quantity remaining value could be broadcast on the vehicle bus and transmitted to the dispatch terminal.
  • tank capacity of the vehicle may be preprogrammed into the processor 92.
  • tank capacity may be programmed into the dispatch terminal.
  • the hours to empty value may be obtained using an inference method.
  • the hours to empty value may be obtained using the percentage of capacity value 290, the internal timing (clock) of the processor 92, and the average fuel flow rate.
  • the inference method employed is illustrated in Table 5.
  • ratio-metric approach illustrated in Table 5 eliminates the need to know the tank capacity, but is not as accurate as methods that rely on tank capacity knowledge. However, the ratio-metric method may be modified to permit the processor 92 to learn the vehicle tank capacity, increasing accuracy, while still eliminating the need to pre-program tank capacity information.
  • Tank capacity/size may be determined according to Eqn. 4, as illustrated in Table 6.
  • the system 25 may be used to identify fuel leaks, and detect fuel fraud or theft.
  • a fuel quantity remaining value may be obtained by finding the quotient of the tank capacity and the percentage of capacity value, according to Eqn. 5.
  • FQR [(PCV) x (RHCCH / %) x 100] *(AFFR) Eqn. 5 where FQR is the Fuel Quantity Remaining, PCV is the percentage of capacity value, RHCCH is the Ratio of Hours to a 1% Capacity Change in Hours, and AFFR is the Average Fuel Flow Rate. The calculation is illustrated in Table 7. Table 7.
  • Absolute error in terms of the percentage of capacity value, is simply the error at any level over the full range of operating conditions likely to be encountered by the system 25. This is best understood by review of an example.
  • Table 8 includes a series of measurements, taken at 30-minute intervals, as fuel drains from a tank and as the temperature cycles over an operating range of the processor 92.
  • the worst case absolute error is +1 .0%/-0.2% for the measurements made.
  • the absolute error can be restated as:
  • the performance of the processor 92 may also be evaluated using RSS (root square sum) error theory. Using the hours to empty algorithm discussed above, the representations shown in Table 9 may be developed. The data in Table 9 is for a 1/3 full, 240-gallon tank(s) with a fuel flow rate of approximately 7.5 gallons per hour.
  • the relative error from measurement to measurement varies between 0.1 % and -0.1% of full-scale capacity, far less than the 1.0% absolute error recorded for the same data.
  • the system 90 is fairly sensitive to the relative accuracy of the percentage of capacity value and somewhat sensitive to the absolute accuracy. A number of design choices and general environmental issues affect these sensitivities. Table 12 sets out the effects of various factors.
  • the inventor(s) believe(s) that one way to manage relative accuracy is to save consecutive time indexed percentage of capacity data readings in RAM and periodically fit the data to a straight line using a least squares best fit approach. The slope of the straight line obtained is then used as the ⁇ %Capacity/ ⁇ time quotient. The ⁇ %Capacity/ ⁇ time quotient is then used to provide the basis for the calculations of time to empty, tank size, and other fuel related data.
  • the present invention provides a fuel optimization system with an improved fuel level sensor.
  • the system generates refueling and fuel usage information that prior systems are unable to provide.
  • the system also provides enhanced protection against fuel fraud or theft.

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Abstract

L'invention concerne un système de surveillance de la consommation de carburant et d'optimisation du ravitaillement d'un véhicule. Le système comprend un détecteur de niveau de carburant conçu pour se monter sur un réservoir de carburant. Ce détecteur est doté d'un transducteur, tel qu'un transducteur électronique, servant à générer un signal de distance représentant la distance entre le détecteur et la surface du carburant dans le réservoir. Un processeur, couplé au transducteur, est programmé pour convertir le signal de distance en un signal de pourcentage de capacité, calculer le volume de carburant présent dans le réservoir, et créer un message comprenant des informations relatives audit volume. Le processeur du détecteur de niveau de carburant est couplé à un réseau qui peut comprendre un terminal d'expédition, un serveur d'optimisation de carburant, et un service d'indication du prix du carburant à chaque emplacement. Le réseau calcule un emplacement optimal pour faire le plein et un itinéraire pour atteindre cet emplacement. Il émet un message contenant ces informations au système d'informations du véhicule. Des dispositifs, couplés audit système, affichent ensuite le message informant le conducteur où et quand ravitailler son véhicule en carburant.
PCT/US2001/010089 2000-04-28 2001-03-29 Systeme d'optimisation de carburant dote d'un detecteur ameliore du niveau de carburant WO2001084090A1 (fr)

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EP1588900A1 (fr) * 2004-04-22 2005-10-26 Hella KGaA Hueck & Co. Disposif de lecture pour des capteurs dans le compartiment moteur d'un véhicule automobile
WO2009002986A1 (fr) * 2007-06-26 2008-12-31 Qualcomm Incorporated Déclaration de taxe sur les carburants de véhicule frigorifique pour l'industrie du transport
CN101470001B (zh) * 2007-12-27 2011-12-14 英业达股份有限公司 自动规划加油路径的方法
US8583387B2 (en) 2010-06-04 2013-11-12 Ssi Technologies, Inc. Ultrasonic level, on-board diagnostic assessment
CN112129378A (zh) * 2020-07-31 2020-12-25 东风商用车有限公司 车用燃油箱油量非接触式测量装置
CN113124953A (zh) * 2020-01-16 2021-07-16 广州汽车集团股份有限公司 汽车燃油表中油量显示的计量方法、装置及相关设备
CN116061962A (zh) * 2022-12-30 2023-05-05 瑞修得信息科技(无锡)有限公司 一种关于车辆轮胎打滑的可降油耗提醒方法及装置

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CN113124953A (zh) * 2020-01-16 2021-07-16 广州汽车集团股份有限公司 汽车燃油表中油量显示的计量方法、装置及相关设备
CN112129378A (zh) * 2020-07-31 2020-12-25 东风商用车有限公司 车用燃油箱油量非接触式测量装置
CN116061962A (zh) * 2022-12-30 2023-05-05 瑞修得信息科技(无锡)有限公司 一种关于车辆轮胎打滑的可降油耗提醒方法及装置
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