GB922659A - Control system for trucks - Google Patents

Control system for trucks

Info

Publication number
GB922659A
GB922659A GB1081/61A GB108161A GB922659A GB 922659 A GB922659 A GB 922659A GB 1081/61 A GB1081/61 A GB 1081/61A GB 108161 A GB108161 A GB 108161A GB 922659 A GB922659 A GB 922659A
Authority
GB
United Kingdom
Prior art keywords
truck
motor
tilt
lift
driven
Prior art date
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
Application number
GB1081/61A
Inventor
Herbert Morris
John Phillips
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electro Hydraulics Ltd
Original Assignee
Electro Hydraulics Ltd
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
Application filed by Electro Hydraulics Ltd filed Critical Electro Hydraulics Ltd
Priority to GB1081/61A priority Critical patent/GB922659A/en
Publication of GB922659A publication Critical patent/GB922659A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P4/00—Arrangements specially adapted for regulating or controlling the speed or torque of electric motors that can be connected to two or more different electric power supplies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/02—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles characterised by the form of the current used in the control circuit
    • B60L15/04—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles characterised by the form of the current used in the control circuit using dc
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

922,659. Control of several D.C. motors. ELECTRO-HYDRAULICS Ltd. Dec. 20, 1961 [Jan. 10, 1961], No. 1081/61. Class 38 (3). An industrial truck has a divided battery I, 2, adapted for series or parallel connection, a traction motor 8, and auxiliary pump motors 13, 14, for tilting and lifting respectively. Initially, when the truck is stationary, the battery sections 1, 2 are connected in parallel. Closure of contacts 19 to select lifting energizes motor 14 and connects the sections 1, 2 in series, a resistor 17 providing smooth switching transition. A circuit is also completed for the pump motor 13. If switch 19 is returned to neutral and switch 21 is actuated, both pumps are driven at half-speed since the battery sections are connected in parallel. When the truck is driven slowly in either the forward or reverse direction, contacts 25 or 28 are open so that the battery sections are connected in parallel, and only half the maximum voltage can be applied to the pump motors. To drive the truck at full speed, contacts 32 are opened and contacts 31 are closed, whereby the battery sections are connected in series. Energization of pump motor 13 is prevented, but pump motor 14 may be operated by means of switch 19 or 22. In another arrangement an additional switch is provided to connect the battery sections in series when the truck is stationary and tilt is selected, the lift selector being in neutral when tilt is selected under these conditions. If lift and tilt are selected when the truck is stationary, both pump motors are driven but the battery sections are connected in parallel, Fig. 3 (not shown). In a further embodiment, a rectifier is included in the control circuit. When the truck is stationary and lift is selected, maximum voltage is applied to both pump motors; if tilt is selected and the lift selector is in neutral, the motor 13 is energized but the motor 14 does not run because the rectifier prevents energization of coil 37. If tilt and lift are selected simultaneously, both pump motors are driven and the battery sections are connected in series. When the truck is driven slowly and lift or tilt is selected, both pump motors are driven and the battery sections are connected in parallel. When the truck is driven fast and lift is selected the battery sections are connected in series and the motor 14 is energized. If tilt is selected, the motor 13 is not energized, Fig. 4 (not shown). The pump motors are prevented from starting simultaneously, thus reducing the peak load on the battery. The field windings of the motors may be tapped through electromagneticallyoperated contacts.
GB1081/61A 1961-01-10 1961-01-10 Control system for trucks Expired GB922659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1081/61A GB922659A (en) 1961-01-10 1961-01-10 Control system for trucks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1081/61A GB922659A (en) 1961-01-10 1961-01-10 Control system for trucks

Publications (1)

Publication Number Publication Date
GB922659A true GB922659A (en) 1963-04-03

Family

ID=9715842

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1081/61A Expired GB922659A (en) 1961-01-10 1961-01-10 Control system for trucks

Country Status (1)

Country Link
GB (1) GB922659A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2129234A (en) * 1982-10-28 1984-05-10 Vessa Ltd Powered wheelchair having improved control circuit
GB2154383A (en) * 1984-02-15 1985-09-04 Mark Palmer Motor control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2129234A (en) * 1982-10-28 1984-05-10 Vessa Ltd Powered wheelchair having improved control circuit
GB2154383A (en) * 1984-02-15 1985-09-04 Mark Palmer Motor control system

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