US3748466A - Vehicle control system - Google Patents

Vehicle control system Download PDF

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Publication number
US3748466A
US3748466A US00152845A US3748466DA US3748466A US 3748466 A US3748466 A US 3748466A US 00152845 A US00152845 A US 00152845A US 3748466D A US3748466D A US 3748466DA US 3748466 A US3748466 A US 3748466A
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United States
Prior art keywords
vehicle
speed
accordance
zone
control
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Legal status (The legal status 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 status listed.)
Expired - Lifetime
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US00152845A
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English (en)
Inventor
W Smith
H Sibley
J Auer
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SPX Technologies Inc
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General Signal Corp
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
    • B61L27/20—Trackside control of safe travel of vehicle or train, e.g. braking curve calculation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
    • B61L27/04—Automatic systems, e.g. controlled by train; Change-over to manual control

Definitions

  • the vehicle control system operates vehicles over the right-of-way divided into a plurality of zones and has control means for govemung safe operation of the vehicle in accordance with traffic conditions.
  • the improvement comprises means of selecting both a desired speed limit and speed command control for communication to the vehicle occupying any of the zones in accordance with the conditions of traffic in advance of the zone, the selecting means is effective to select a relatively low command speed control zone in accordance with the selection of a relatively low speed control for at least one zone in advance of the vehicle in accordance with the safe stopping distance.
  • Means communicates the selected limit and command speeds for each zone from the wayside to the vehicle occupying the zone and means controls operation of each vehicle in accordance with the selected speed limit and speed command controls communicated to the vehicle from the wayside.
  • Operatorless automatic vehicle control systems re quire a number of safety and supervisory sub-systems for safe and efficient operation.
  • an automatic vehicle protection system is necessary which must be substantially fail-safe in order to provide for safe public transportation.
  • An automatic vehicle operation subsystem is included in order to provide the normal control of the vehicle within the restraints of the safety sub-system and a supervisory system is provided in order to provide such functions as, for example, performance monitoring, route control or other supervisory requirements.
  • the basic functions of an automatic vehicle control system must provide for protection of trains from headon and rear-end collisions, speed regulation and, of course, safe passenger door operation.
  • the system which operates automatically must establish safe remotely controlled switch routing and checking and include vehicle responsive apparatus which operates in accordance with certain supervisory controls.
  • lt is another object of the present invention to provide an improved system for communicating between the vehicle and the wayside for maintaining those communications in a safe manner.
  • a vehicle control system has been provided for operating vehicles over a right-of-way divided into a plurality of zones having control means for governing safe operation of the vehicles in accordance with traffic conditions.
  • the improvement comprises, means for selecting both the desired speed limit control and speed command control for communication to the vehicle occupying any of the zones in accordance with conditions of traffic in advance of such zone.
  • the selecting means is effective to select a relatively low command speed control for each zone in accordance with the selection of relatively low limit speed control for at least one zone in advance of the vehicle in accordance with the safe stopping distance.
  • Means is provided for communicating the selected limit and command signal for each zone from the wayside to the vehicle in the associated zone and means for controlling operation of each vehicle is included which operates in accordance with the speed limit and speed command controls communicated to the vehicle from the wayside.
  • an overspeed detection apparatus including a pair of high pass filters having inputs governed by actual vehicle speed signals for delivering outputs of the respective filters in accordance with the actual speed limit inputs only provided that the frequency of the inputs is above the frequency of the high pass filters.
  • Checking means is provided including an oscillator generating and check signal having a frequency higher than the frequency of the high pass filters and a switching means for alternately applying the check frequency to the inputs of the filters so that the filters alternately deliver output check frequency signals.
  • the output means is governed jointly by the output of the high pass filters and is operable to one state or another only when one of the filters at a time is delivering an output, or operable to the other state when both filters deliver outputs comtemporaneously.
  • the vehicle control system has means on the vehicle for demarcating the ends thereof and wayside marker means at an entering boundary for zones responsive to the passage of each end of the vehicle for respectively assuming first and second conditions in accordance with the passage of an odd or even number of demarcating means respectively.
  • Occupancy means for each zone is responsive to its associated wayside marker and registers occupancy in accordance with the first condition until cancelled while reset means governs the occupancy means and is itself governed jointly by the first condition for the next two wayside markers in advance of the vehicle and the second condition for its associated marker for cancelling the occupancy indication.
  • the control system includes means for selecting the direction of traffic along a guideway and means responsive to the vehicle presence upon entering a zone from either direction for registering the occupancy condition thereof.
  • the means governed jointly by the occupancy responsive means and the direction selecting means renders the control means operative to restrictive aspects in accordance with the selected number of zones behind the leading vehicle relative to the selected direction of traffic.
  • FIGS. 1A and IB are diagrams of the general plan of the present invention.
  • FIG. 2 is a diagram of vehicle carried control equipment.
  • FIG. 3 is a diagram of wayside equipment used in conjunction with the vehicle carried control equipment.
  • FIG. 4 is a detail of the overspeed and motion detector from FIG. 2.
  • FIG. 5 is a diagram showing the distribution of speed limit and command controls for a number of occupied blocks.
  • FIG. 6 is a diagram showing safe stopping distances for speed limit control and speed command control.
  • FIGS. 7A-BC illustrate the check in-check out safety subsystem.
  • FIGS. 8AB are further illustrations of apparatus shown in block form in FIG. 5.
  • FIG. 9 is a drawing showing means to communicate speed limit and speed controls from the wayside to the vehicles.
  • FIGS. lA-B show an alternate embodiment of a check in-check out system.
  • FIG. 11A is a drawing of vehicle to wayside transmission means.
  • FIG. [18 is a drawing of vehicle to wayside receiver means.
  • FIGS. l2A-B show means to transmit logic for communication from the wayside to the terminal processors.
  • FIG. 13 shows the relation of partitioned drawings.
  • the system of the present invention generally includes systems for automatic vehicle protection AVP, automatic vehicle operation AVO, and automatic vehicle supervision AVS.
  • the automatic vehicle protection safety subsystem includes normally located wayside elements for vehicle protection, block occupancy memory, vehicle control signal generation, selection and transmission, switch interlocking and control, and platform door control.
  • safety hardware is included for receiving vehicle control signals, for governing the maximum speed, for initiating irrevocable stops on either a service or emergency brake basis as required, for permitting automatic door operation only when safe, and for preventing automatic movement in the reverse direction.
  • transmitters and receivers for communicating digital information from the lead vehicle of these trains to the wayside at approaches to switches and station platforms. These messages contain information relative to the routing of the vehicle, the identity and malfunction status, and station operation. Apparatus is also provided for communicating digital data from the wayside to terminal processers serving a number of designated areas. These terminal processers serve as intermediate links between the wayside and the central processing unit.
  • the system comprises a guideway layout GW divided into a number of blocks of which blocks A through G are shown in the drawing.
  • Vehicle VI travels within the guideway GW in one of a number of selected routes as established by commands communicated from the vehicle VI to the wayside for controlling the switches SW.
  • Each block includes a wayside loop 20 which extends the full length of the block for continually transmitting information to the vehicle within the particular block, in this case vehicle V].
  • a terminal processor 21 couples the apparatus with a centralized location having a master process control computer, not shown. Communications from the computer are transmitted to each vehicle (and individual wayside located apparatus) over the terminal processor 21 for a selected area.
  • Each terminal processor 21 provides a link between the computer and a number of related blocks.
  • Each block includes communication apparatus linking the terminal processor 21 and the vehicle V1 located therein.
  • the terminal processor 21 includes a master control generator 22 which in this embodiment produces a number of code rate frequencies.
  • a master control generator 22 which in this embodiment produces a number of code rate frequencies.
  • F1, F2 and F3 are utilized, F1 and F2 respectively indicative of low and medium speed limits and the combination of F1 and F2 high speed limit.
  • F3 is used in conjunction with the F1 and F2 signals for varying command speeds transmitted to the vehicle V1. That is, F1 and F2 are used to designate speed limits, while combinations of F1, F2 and F3 indicate the command speeds which are less than or equal to speed limit signals.
  • Speed commands are used in conjunction with speed limits of low, medium and high as shown in the following table:
  • the additional frequency F3 is utilized to add versatility to the system so that speed commands and speed limits have different characteristics.
  • the F3 signal is communicated over non-vital apparatus because it is not necessary to provide fail-safe communications for the speed command. The reason for this is that the speed limits control and the vehicle will go into an emergency stop condition if it is travelling faster than the speed limit signal permits regardless of the speed command signal.
  • FIGS. 1A & 1B illustrates the general configuration of the system with respect to communication of speed limits and speed controls to the loops 20 in accordance with the condition of blocks in advance of the vehicle V1.
  • Each block has a block occupancy sensor 23 which read transmitters 28-28 for demarcating the ends of the vehicle.
  • occupancy is registered for that block, in this case, block C.
  • Occupancy detector 24 registers the occupancy of the vehicle in block C and transmits a signal rearwardly to speed selection units 25 for at least four previous blocks.
  • this diagram is a plan view of the system and it is intended that the vehicle may travel in either direction along the guideway GW.
  • control is shown only for one direction; that is, from left to right.
  • the drawing shows the vehicle VI in block C, therefore, the detector 23 has provided a signal to the occupancy detector 24 for registering occupancy of the vehicle V1 in block C.
  • the speed selectors 25 for the preceding four blocks receive a signal that block C is occupied and their speed controls are adjusted in accordance with a preselected speed limit pattern for this configuration.
  • a preselected speed limit pattern for example, may provide that block B directly in back of the vehicle is at stop, while block A is at low speed and the previous two blocks, not shown,
  • V1 may be at some medium or high speed in accordance with the safe stopping characteristics of vehicle V1 following. For purposes of this discussion, however, it is only necessary to show that some selected number of blocks rearward of the vehicle must be informed of the occupancy status of the vehicle.
  • the occupancy detector 24 provides a signal to OR gate 26 which initiates a signal to amplifier 27 which is keyed for enabling communication of speed code signals to the loop from the speed selection unit associated with block C.
  • a line 28 is also coupled to the OR gate 26 for block D in advance of the vehicle; so that block is keyed for the approach of the vehicle V1 as it crosses from C to D.
  • Frequency signals generated by the speed selection unit 24 are communicated to the vehicle V1 over the loop 20 via receiver antenna illustrated in FIG. 2.
  • Filter 41 passes frequencies F1, F2, F3 and they are communicated through amplifier 42 to modulation detector 43.
  • the modulation detector 43 is capable of picking out the speed limit and command signals and energizing relays in accordance with the transmitted signals for energized inputs to speed control 44 which governs the running speed of the vehicle.
  • Other signals including a modulation frequency for the door control 46 may also be transmitted through the antenna and decoded at 43 for operating the doors in accordance with the proper positioning of the vehicle at a station platform.
  • Overspeed and motion detector is responsive to the modulation detector 43 for holding off emergency brake release and the power controller 51.
  • An input from tachometer 47 compares the actual vehicle speed with the speed limit as detected by signals from the modulation detector 43.
  • the emergency brake release 50 may be a mechanically actuated apparatus which holds off application of the emergency brakes in accordance with a signal from the overspeed and motion detector 45 if the speed limit signal is lower than the actual speed as determined by the tachometer 47.
  • Power controller 51 is coupled to the emergency brake release and decouples motive power for the vehicle Vl when the emergency brakes are released so that the vehicle will come to a safe and rapid stop when an unsafe condition is detected.
  • Direction detector 49 provides a signal to the motion detector 45 for assuring that the vehicle is travelling in the proper direction and the brake assurance unit accelerometer 48 provides a signal to the detector 45 for acknowledging that the vehicle is slowing down in accordance with a change in speed limit or speed command signals as provided through the detector 43.
  • the motion detector 45 signals a door control apparatus 46 for preventing their operation if the vehicle V1 is moving at the train platform.
  • a holding brake detector 52 governing the door control 46 assures that the brakes have been applied.
  • Inputs from the brake detector 52 and the motion detector 45 are transmitted to levitation control 53 which deleviates the car V] at the station platform.
  • the levitation of the vehicle may be an air bag suspension or an air cushion system, but for purposes of this discussion it is important to note only that it is necessary to align the vehicle V1 with the station platform longitudinally within the limits of a berthing loop on the wayside (see FIG. 3) and also level with respect to the station platform.
  • the signal is communicated to berth tone generator 54 which produces a distinctive tone for transmission at its output loop 55.
  • a berthing loop 60 located mainly at the station platforms or docking areas receives a signal from the berth transmitting loop 55 if the vehicle Vl has stopped within the confines of the loop 60.
  • a signal from the transmitting loop 55 is fed through filter 64 detector 65 and level detector 66 before a door open command may be provided to the command selector 67.
  • the command selector 67 provides a signal to amplifier 68 for opening the doors, this signal is received atantenna 40 and filtered at 41 amplified at 42 and decoded in the demodulator 43.
  • the door open command which would be some distinctive frequency is transmitted to door control 46 for actuating the vehicle doors.
  • the occupancy sensor 61 and occupancy detector 62 must key the OR gate 63 so that the amplifier 68 is capable of transmitting the command signal for a door open designation to the vehicle.
  • a signal from control is coupled to command selector 67 for deactivating the door open command which essentially cuts off the distinctive door control frequency which is transmitted over the loop 60 to the vehicle V1.
  • the doors on the vehicle then close in accordance with the cessation of the door open command signals and if the vehicle doors properly close, levitation control 53 is apprised of this condition and actuates apparatus'for raising the car to its operative position.
  • the brakes of the vehicle are also released in this sequence and when brake release is detected, speed control 44 is conditioned for accepting signals from the wayside for proceeding to the next scheduled stop.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)
US00152845A 1971-06-14 1971-06-14 Vehicle control system Expired - Lifetime US3748466A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15284571A 1971-06-14 1971-06-14

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US3748466A true US3748466A (en) 1973-07-24

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US00152845A Expired - Lifetime US3748466A (en) 1971-06-14 1971-06-14 Vehicle control system

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US (1) US3748466A (de)
CA (2) CA954968A (de)
DE (1) DE2228126A1 (de)
ES (1) ES403848A1 (de)
FR (1) FR2141872B1 (de)
GB (1) GB1401651A (de)
IT (1) IT958340B (de)
NL (1) NL7207634A (de)

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848836A (en) * 1973-01-03 1974-11-19 Saab Scania Ab Car actuated inductive block control
US3858832A (en) * 1973-08-01 1975-01-07 Rolair Syst Inc Control system for air cushion transporter
US3886420A (en) * 1973-09-10 1975-05-27 Gen Signal Corp Frequency responsive speed control apparatus
US3887152A (en) * 1973-10-01 1975-06-03 Gen Signal Corp Automatic vehicle protection system
US3895584A (en) * 1972-02-10 1975-07-22 Secr Defence Brit Transportation systems
US4002314A (en) * 1975-07-07 1977-01-11 Westinghouse Electric Corporation Train vehicle speed control signal providing apparatus
US4007897A (en) * 1975-09-09 1977-02-15 General Signal Corporation Control system for monitoring vehicle passage at predetermined locations
US4014503A (en) * 1974-05-17 1977-03-29 Siemens Aktiengesellschaft Method and apparatus for control of central spacing of track-operated vehicles
US4015807A (en) * 1975-04-04 1977-04-05 Societe Generale De Constructions Electriques Et Mecaniques (Alsthom) Logic passing device for automatic railway piloting
US4029274A (en) * 1976-04-12 1977-06-14 General Signal Corporation Train control signalling system
US4034942A (en) * 1975-03-24 1977-07-12 International Standard Electric Corporation Method of leading a rail vehicle by means of a control center from an automatically controlled area to an area of individual control
US4166599A (en) * 1977-06-21 1979-09-04 General Signal Corporation Wayside oriented moving block
US4349170A (en) * 1978-12-22 1982-09-14 Compagnie De Signaux Et D'entreprises Electriques Safety coding process for track circuits
US5590603A (en) * 1995-06-07 1997-01-07 Autran Corp. Transportation system including elevated guideway
US5590604A (en) * 1995-06-07 1997-01-07 Autran Corp. Transportation system with high speed vehicles and automatic control
US5598783A (en) * 1995-06-07 1997-02-04 Autran Corp. Integrated transportation system including transfer vehicles
US5706735A (en) * 1995-06-07 1998-01-13 Autran Corp. System for automated transport of automobile platforms, passenger cabins and other loads
US6008740A (en) * 1997-12-17 1999-12-28 Stmicroelectronics, Inc. Electronic speed limit notification system
US20080003900A1 (en) * 2004-02-11 2008-01-03 Econtrols, Inc. Watercraft speed control device
US20080003899A1 (en) * 2004-02-11 2008-01-03 Econtrols, Inc. Watercraft speed control device
US20080009206A1 (en) * 2004-02-11 2008-01-10 Econtrols, Inc. Watercraft speed control device
US20080009205A1 (en) * 2004-02-11 2008-01-10 Econtrols, Inc. Watercraft speed control device
US20080085642A1 (en) * 2006-10-04 2008-04-10 Econtrols, Inc. Method for engaging a watercraft speed control system
US20080113568A1 (en) * 2004-02-11 2008-05-15 Econtrols, Inc. Watercraft speed control device
US20080243321A1 (en) * 2005-02-11 2008-10-02 Econtrols, Inc. Event sensor
US20090209153A1 (en) * 2004-02-11 2009-08-20 Econtrols, Inc. Watercraft speed control device
US20100235090A1 (en) * 2009-03-13 2010-09-16 Borowy Bogdan S System and Method for Vehicle Position Sensing with Helical Windings
US7877174B2 (en) 2005-02-11 2011-01-25 Econtrols, Inc. Watercraft speed control device
CN101486348B (zh) 2008-12-19 2011-06-01 深圳市远望谷信息技术股份有限公司 火车机车临时限速的方法
US8475221B1 (en) 2004-02-11 2013-07-02 Econtrols, Inc. Watercraft speed control device
US8521348B1 (en) 2004-02-11 2013-08-27 Econtrols, Inc. Watercraft speed control device
US9052717B1 (en) 2004-02-11 2015-06-09 Enovation Controls, Llc Watercraft speed control device
US9156372B1 (en) 2011-04-26 2015-10-13 Enovation Controls, Llc Multinodal ballast and trim control system and method
US9207675B1 (en) 2005-02-11 2015-12-08 Enovation Controls, Llc Event sensor

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8602509D0 (en) * 1986-02-01 1986-03-05 Westinghouse Brake & Signal Automatic train operation
GB2193022B (en) * 1986-07-24 1990-08-22 Westinghouse Brake & Signal A railway signalling system
GB2219118B (en) * 1988-05-26 1992-10-28 Daifuku Kk Conveyor system using automotive cart.
CN102285363A (zh) * 2011-08-03 2011-12-21 西安盛佳光电有限公司 行车安全管理方法及系统
ITUB20150244A1 (it) 2015-02-10 2016-08-10 Univ Degli Studi Del Molise Accendino biologico a gas idrogeno

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041448A (en) * 1961-02-20 1962-06-26 Westinghouse Air Brake Co Automatic train operation system
US3045112A (en) * 1959-06-15 1962-07-17 Gen Railway Signal Co Vehicle control system
US3303339A (en) * 1967-02-07 Automatic electric train control system and apparatus
US3395274A (en) * 1966-01-12 1968-07-30 Westinghouse Air Brake Co Movable block train speed control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303339A (en) * 1967-02-07 Automatic electric train control system and apparatus
US3045112A (en) * 1959-06-15 1962-07-17 Gen Railway Signal Co Vehicle control system
US3041448A (en) * 1961-02-20 1962-06-26 Westinghouse Air Brake Co Automatic train operation system
US3395274A (en) * 1966-01-12 1968-07-30 Westinghouse Air Brake Co Movable block train speed control system

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895584A (en) * 1972-02-10 1975-07-22 Secr Defence Brit Transportation systems
US3848836A (en) * 1973-01-03 1974-11-19 Saab Scania Ab Car actuated inductive block control
US3858832A (en) * 1973-08-01 1975-01-07 Rolair Syst Inc Control system for air cushion transporter
US3886420A (en) * 1973-09-10 1975-05-27 Gen Signal Corp Frequency responsive speed control apparatus
US3887152A (en) * 1973-10-01 1975-06-03 Gen Signal Corp Automatic vehicle protection system
US4014503A (en) * 1974-05-17 1977-03-29 Siemens Aktiengesellschaft Method and apparatus for control of central spacing of track-operated vehicles
US4034942A (en) * 1975-03-24 1977-07-12 International Standard Electric Corporation Method of leading a rail vehicle by means of a control center from an automatically controlled area to an area of individual control
US4015807A (en) * 1975-04-04 1977-04-05 Societe Generale De Constructions Electriques Et Mecaniques (Alsthom) Logic passing device for automatic railway piloting
US4002314A (en) * 1975-07-07 1977-01-11 Westinghouse Electric Corporation Train vehicle speed control signal providing apparatus
US4007897A (en) * 1975-09-09 1977-02-15 General Signal Corporation Control system for monitoring vehicle passage at predetermined locations
US4029274A (en) * 1976-04-12 1977-06-14 General Signal Corporation Train control signalling system
US4166599A (en) * 1977-06-21 1979-09-04 General Signal Corporation Wayside oriented moving block
US4349170A (en) * 1978-12-22 1982-09-14 Compagnie De Signaux Et D'entreprises Electriques Safety coding process for track circuits
US5590603A (en) * 1995-06-07 1997-01-07 Autran Corp. Transportation system including elevated guideway
US5590604A (en) * 1995-06-07 1997-01-07 Autran Corp. Transportation system with high speed vehicles and automatic control
US5598783A (en) * 1995-06-07 1997-02-04 Autran Corp. Integrated transportation system including transfer vehicles
US5706735A (en) * 1995-06-07 1998-01-13 Autran Corp. System for automated transport of automobile platforms, passenger cabins and other loads
US6008740A (en) * 1997-12-17 1999-12-28 Stmicroelectronics, Inc. Electronic speed limit notification system
US20080009206A1 (en) * 2004-02-11 2008-01-10 Econtrols, Inc. Watercraft speed control device
US8145372B2 (en) 2004-02-11 2012-03-27 Econtrols, Inc. Watercraft speed control device
US9052717B1 (en) 2004-02-11 2015-06-09 Enovation Controls, Llc Watercraft speed control device
US20080009205A1 (en) * 2004-02-11 2008-01-10 Econtrols, Inc. Watercraft speed control device
US20080003900A1 (en) * 2004-02-11 2008-01-03 Econtrols, Inc. Watercraft speed control device
US20080113568A1 (en) * 2004-02-11 2008-05-15 Econtrols, Inc. Watercraft speed control device
US8521348B1 (en) 2004-02-11 2013-08-27 Econtrols, Inc. Watercraft speed control device
US7465203B2 (en) 2004-02-11 2008-12-16 Econtrols, Inc. Watercraft speed control device
US7485021B2 (en) 2004-02-11 2009-02-03 Econtrols, Inc. Watercraft speed control device
US7491104B2 (en) 2004-02-11 2009-02-17 Econtrols, Inc. Watercraft speed control device
US7494394B2 (en) 2004-02-11 2009-02-24 Econtrols, Inc. Watercraft speed control device
US7494393B2 (en) 2004-02-11 2009-02-24 Econtrols, Inc. Watercraft speed control device
US20090209153A1 (en) * 2004-02-11 2009-08-20 Econtrols, Inc. Watercraft speed control device
US8475221B1 (en) 2004-02-11 2013-07-02 Econtrols, Inc. Watercraft speed control device
US20080003899A1 (en) * 2004-02-11 2008-01-03 Econtrols, Inc. Watercraft speed control device
US9098083B1 (en) 2005-02-11 2015-08-04 Enovation Controls, Llc Event sensor
US7877174B2 (en) 2005-02-11 2011-01-25 Econtrols, Inc. Watercraft speed control device
US9207675B1 (en) 2005-02-11 2015-12-08 Enovation Controls, Llc Event sensor
US20080243321A1 (en) * 2005-02-11 2008-10-02 Econtrols, Inc. Event sensor
US9092033B1 (en) 2005-02-11 2015-07-28 Enovation Controls, Llc Event sensor
US8983768B1 (en) 2005-02-11 2015-03-17 Enovation Controls, Llc Event sensor
US9068838B1 (en) 2005-02-11 2015-06-30 Enovation Controls, Llc Event sensor
US20080085642A1 (en) * 2006-10-04 2008-04-10 Econtrols, Inc. Method for engaging a watercraft speed control system
CN101486348B (zh) 2008-12-19 2011-06-01 深圳市远望谷信息技术股份有限公司 火车机车临时限速的方法
US8532918B2 (en) * 2009-03-13 2013-09-10 General Atomics System and method for vehicle position sensing with helical windings
US20100235090A1 (en) * 2009-03-13 2010-09-16 Borowy Bogdan S System and Method for Vehicle Position Sensing with Helical Windings
US9156372B1 (en) 2011-04-26 2015-10-13 Enovation Controls, Llc Multinodal ballast and trim control system and method

Also Published As

Publication number Publication date
FR2141872A1 (de) 1973-01-26
FR2141872B1 (de) 1977-12-23
AU4270272A (en) 1973-11-29
IT958340B (it) 1973-10-20
ES403848A1 (es) 1975-05-16
CA960346A (en) 1974-12-31
CA954968A (en) 1974-09-17
DE2228126A1 (de) 1973-02-08
GB1401651A (en) 1975-07-16
NL7207634A (de) 1972-12-18

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