US3761729A - Arrangement for preventing excessive speeds in internal combustion engines - Google Patents

Arrangement for preventing excessive speeds in internal combustion engines Download PDF

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Publication number
US3761729A
US3761729A US00208679A US3761729DA US3761729A US 3761729 A US3761729 A US 3761729A US 00208679 A US00208679 A US 00208679A US 3761729D A US3761729D A US 3761729DA US 3761729 A US3761729 A US 3761729A
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US
United States
Prior art keywords
speed
bistable circuit
circuit means
output
arrangement
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Expired - Lifetime
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US00208679A
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English (en)
Inventor
G Engel
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of US3761729A publication Critical patent/US3761729A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/007—Electric control of rotation speed controlling fuel supply
    • F02D31/009—Electric control of rotation speed controlling fuel supply for maximum speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/0205—Circuit arrangements for generating control signals using an auxiliary engine speed control

Definitions

  • This invention relates to a safety arrangement for preventing excessive speeds in internal combustion engines. It is particularly useful in conjunction with internal combustion engines which have an unstable speed characteristic, and particularly for Diesel engines in which fuel is injected by means of electronic regulators.
  • the safety arrangement is energized by a tachometer which is connected to the shaft of the internal combustion engine and furnishes speed signals, signifying the engine speed of said internal combustion engine.
  • Diesel motors may be driven much more exactly within their operating characteristics if for each operating condition the fuel .supply is varied. correspondingly. This may be accomplished most readily by an electronic regulating system, since the electronic regulating system, as opposed to mechanical systems, can readily accommodate a plurality of parameters in determining of the amount of fuel for operating the cycle. Because of the previously mentioned unstable speed characteristic of such Diesel motors, it is particularly necessary that a reliable excessive speed control be furnished in conjunction with the electronic regulating circuit, since the electronic and electrical elements are subject to failure during operation.
  • the present invention comprises an arrangement for furnishing an output signal when the speed of an internal combustion engine exceeds a predetermined speed. It comprises tachometer means having a first and second output winding, and furnishing a speed signal corresponding to the speed of said internal combustion engine on each of these output windings.
  • Bistable circuit means have a first and second input respectively connected to said first and second output winding.
  • the bistable circuit means have a first stable state when the speed of the engine is less than said predetermined speed and respond to said speed signal on each of said output windings to charge to a second stable state when the'speed of said engine exceeds said predetermined speed.
  • Output means furnish an output signal when said bistable circuit means are in said second state.
  • the output signal can be used to stop the fuel supply to the engine, thereby causing the engine to stop.
  • the arrangement of the present invention is of particular advantage when the regulation of the fuel supply of the internal combustion engine is carried out completely in an electronic fashion so that additional mechanical regulating, control or safety components can be eliminated.
  • the tachometer means comprise an A.C. generator and diodes are connected between the output windings and the respective inputs to the bistable states.
  • the diodes are connected with such a polarity that the current flowing therethrough causes a voltage to appear at both inputs which tends to cause the bstable circuit means to flip into the second stable state, indicating excessively high speeds.
  • Use of an A.C. tachometer yields the advantage, that no currentcarrying mechanical parts are required. For example, brushes and commutators are subject to rather rapid wear and do not offer a constant resistance to current flow.
  • the single FIGURE shows one embodiment of the present invention.
  • FIGURE shows a circuit diagram of a circuit furnishing an output signal when the engine speed exceeds a predetermined speed.
  • This circuit arrangement is connected to the output of an A.C. tachometer. It comprises bistable circuit means having a transistor 10 and a transistor 11. The emitters of the two transistors are connected in common to ground through a resistance 12. The collector of transistor 10 and the collector of transistor 11 are connected to the positive supply line +Ub via a load resistance 13 and 14 respectively. An output terminal 15, one embodiment of output means, is connected to the collector of transistor 11.
  • the tachometer comprises an A.C. generator having windings 20 and 21 mounted on a stator 22 (indicated only schematically). The A.C.
  • Winding-20 has one terminal connected to ground and is connected to the base of transistor 10 via a diode 24 and a resistance 25. Winding 20 is further connected to the base of transistor T11 through a diode 26 and a parallel circuit comprising a resistor 27 and a capacitance 28.
  • Output winding 21 of the tachometer has one terminal connected to ground and the second terminal connected to the base of transistor T10 via a diode 29 connected in series with a parallel circuit comprising a resistance 30 and a capacitance 31.
  • diodes 24 and 26 are connected to the output winding 20, while the cathode of diode 24 is connected through resistance to the base of transistor T10, while the cathode of diode 26 is connected to the base of transistor T11 through resistor 27.
  • the polarity of diode 29 is opposite to that of diodes 21, 26. Specifically, the cathode of diode 29 is connected to output winding 21, while the anode of diode 29 is connected to the base of transistor T10 through resistor 30.
  • the bistable circuit means thus change to the second stable state in which transistor T10 is blocked and transistor T11 is conductive. This causes the output signal to appear at terminal 15. This output signal signifies an excessive speed and causes the fuel supply to the internal combustion engine to be shut off in a manner which is not further illustrated here.
  • the particular speed at which the bistable circuit changes state can be determined by the size of resistors 30 and 27.
  • Zener diodes It is further possible to replace diode 29 and 26 in series with the associated RC circuits by Zener diodes. In this particular case the breakdown voltage of the Zener diodes determines the speed at which the fuel supply is to be blocked.
  • the voltage induced in winding 20 serves to supply the base bias for transistor T10.
  • transistor T10 remains blocked at all times and the signal at terminal 15 does not disappear even after the engine is started.
  • the bistable circuit means When the amplitude of the AC. voltage appearing on coils 20 and 21 has reached the amplitude corresponding to the predetermined speed which is not to be exceeded, the bistable circuit means, as described, switch to the second stable state. It is possible by suitable design of the circuit to cause the bistable circuit means to remain in the second stable state indicating excessive speed even when the speed decreases again, causing the voltages across coils 20 and 21 to decrease correspondingly. The circuit remains in the second stable state until a subsequent restarting of the engine causes a repetition of the above-described cycle.
  • an arrangement for furnishing an output signal when the speed of said engine exceeds a predetermined speed comprising, in combination, tachometer means having a first and second output winding, each of said windings furnishing a speed signal corresponding to the speed of said internal combustion engine; bistable circuit means having a first and second input respectively connected to said first and second output winding of said tachometer means, said bistable circuit means having a first stable state in the presence of speed signals signifying an engine speed less than said predetermined speed, and switching to a second stable state in response to speed signals corresponding to an engine speed exceeding said predetermined speed; and output means connected to said bistable circuit means to furnish said output signal when said bistable circuit means is in said second stablestate.
  • bistable circuit means comprise first transistor means conductive when said bistable circuit means is in said first stable state and second transistor means conductive when said bistable circuit means is in said second stable state; further comprising base bias circuit means connected to said first transistor means and to said first output winding, for furnishing base bias for said first transistor means in dependence on the speed signal furnished by said first output winding.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
US00208679A 1970-12-17 1971-12-16 Arrangement for preventing excessive speeds in internal combustion engines Expired - Lifetime US3761729A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702062140 DE2062140A1 (de) 1970-12-17 1970-12-17 Überdrehzahlsicherung für mit einem elektrischen Regler geführte Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3761729A true US3761729A (en) 1973-09-25

Family

ID=5791272

Family Applications (1)

Application Number Title Priority Date Filing Date
US00208679A Expired - Lifetime US3761729A (en) 1970-12-17 1971-12-16 Arrangement for preventing excessive speeds in internal combustion engines

Country Status (5)

Country Link
US (1) US3761729A (it)
DE (1) DE2062140A1 (it)
FR (1) FR2118458A5 (it)
GB (1) GB1370673A (it)
IT (1) IT944036B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004273A (en) * 1975-08-28 1977-01-18 Kalogerson Thomas A Engine speed responsive anti-theft device for vehicle
WO1984001750A1 (en) * 1982-10-27 1984-05-10 Travel Accessories Mfg Cruise control system and method with overspeed sensor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3636933A (en) * 1969-05-27 1972-01-25 Diesel Kiki Co Electronic governor for injection-type internal combustion engines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3636933A (en) * 1969-05-27 1972-01-25 Diesel Kiki Co Electronic governor for injection-type internal combustion engines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004273A (en) * 1975-08-28 1977-01-18 Kalogerson Thomas A Engine speed responsive anti-theft device for vehicle
WO1984001750A1 (en) * 1982-10-27 1984-05-10 Travel Accessories Mfg Cruise control system and method with overspeed sensor

Also Published As

Publication number Publication date
DE2062140A1 (de) 1972-06-29
FR2118458A5 (it) 1972-07-28
IT944036B (it) 1973-04-20
GB1370673A (en) 1974-10-16

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