GB2377564A - Vehicle with an electrical and a mechanical brake - Google Patents

Vehicle with an electrical and a mechanical brake Download PDF

Info

Publication number
GB2377564A
GB2377564A GB0210015A GB0210015A GB2377564A GB 2377564 A GB2377564 A GB 2377564A GB 0210015 A GB0210015 A GB 0210015A GB 0210015 A GB0210015 A GB 0210015A GB 2377564 A GB2377564 A GB 2377564A
Authority
GB
United Kingdom
Prior art keywords
brake
electric
braking system
mechanical braking
setting means
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.)
Withdrawn
Application number
GB0210015A
Other versions
GB0210015D0 (en
Inventor
Berthold Hacker
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.)
Linde GmbH
Original Assignee
Linde GmbH
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 Linde GmbH filed Critical Linde GmbH
Publication of GB0210015D0 publication Critical patent/GB0210015D0/en
Publication of GB2377564A publication Critical patent/GB2377564A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • 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
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/24—Electrodynamic brake systems for vehicles in general with additional mechanical or electromagnetic braking
    • B60L7/26—Controlling the braking effect
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/10—Vehicle control parameters
    • B60L2240/36—Temperature of vehicle components or parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/10—Road Vehicles
    • B60Y2200/15—Fork lift trucks, Industrial trucks

Abstract

A vehicle, in particular an industrial truck, has at least one electric propulsion motor (2) which is connected to a control device (4) and can be operated in generator mode as an electric brake to brake the vehicle, and has a mechanical braking system (B) which can be operated in combination with the electric brake. In order to reduce the wear and the heating of the mechanical braking system (B), the control device (4) is connected to a setting means (9) provided on the mechanical braking system (B) such that the electric braking moment of the propulsion motor (2) is dependent on a predetermined set value of operation of the mechanical braking system (B), and in which the electric breaking moment of the propulsion motor (2) is set to its greatest possible value. In one embodiment, the setting means (9) is embodied as a device for measuring the force of a control member (8) of the mechanical braking system (B).

Description

-1- 2377564
Vehicle, in particular industrial truck, with an electric and a mechanical brake The invention relates to a vehicle, in particular an industrial truck, with at least one electric propulsion motor which is connected to a control device and which can be operated in generator mode as an electric brake to brake the vehicle. The vehicle also has a mechanical braking system which can be operated in combination with the electric brake.
A plurality of braking systems are present in the industrial trucks of type E14, E16C, E16, E18 and E20P produced and sold in large numbers by Linde AD, Industrial Trucks and Hydraulics Division, Aschaffenburg, since 1995. During operation of these industrial trucks braking can be carried out electrically with the aid of the propulsion motors, for example by releasing the accelerator pedal or by reversing.
In order to boost the electric braking moment and for emergencies in which no electric braking is possible, a mechanical braking system is provided which can produce a mechanical braking moment.
An electric braking system is essentially free of wear. In addition, after conversion into electrical energy, the kinetic energy of the vehicle can be stored in a battery (e.g. traction battery) or used in some other way. This is called active current braking. In contrast, the mechanical braking system is expensive to maintain and heats up in the area of the brake, i.e. in the area of the parts in which the forces counteracting the movement of the vehicle are generated. Therefore, the braking effect declines if the operating force is constant. The brake pads of the brake wear during braking.
The underlying object of the present invention is to provide an industrial truck in which the wear and the heating in the mechanical braking system are reduced.
-2 Therefore, according to the present invention a vehicle, in particular an industrial truck with at least one electric propulsion motor which is connected to a control device and which can be operated in generator mode as an electric brake to brake the vehicle, and with a mechanical braking system which can be operated in combination with the electric brake, is characterized in that the control device is connected to a setting means provided on the mechanical braking system such that the electric braking moment of the propulsion motor is dependent on a predetermined set value of operation of the mechanical braking system, and in which the electric breaking moment of the propulsion motor is set to its greatest possible value.
Thus, the braking moment applied in total consists of an electric component and a mechanical component, the mechanical component of the braking moment being kept small and consequently the mechanical brake only being loaded minimally. This results not only in minimal heating of the brake and considerably reduced wear of brake pads, but the greater component of the braking moment is applied electrically free of wear and can be used beneficially for example by feeding energy back into a traction battery.
Preferably the setting means can be embodied as a device for measuring the travel of a control member of the mechanical braking system. As the electric brake and the mechanical brake are actuated simultaneously, precise adjustment of the device for measuring the travel is necessary. However, in practice difficulties arise with this because over the course of time the brake pads wear down, and the actuating point of the mechanical brake alters.
Therefore, in a preferred construction, it is more advantageous if the setting means is embodied as a device for measuring the force of a control member of the mechanical braking system.
-3 When the control member, for example a brake pedal, is operated, the force with which this is done is measured and - depending on the magnitude of the measured force - an additional electric braking moment is actuated. Here, the aim is always that the electric braking moment component is large and the mechanical braking moment component is small.
Preferably the mechanical braking system is provided with a hydraulic force transmitting device between a control member and a brake, and the setting means is embodied as a pressure measuring device connected to the hydraulic force transmitting device.
Expediently, the setting means is embodied as an analogue measuring system. The set value is then measured and processed in the control device.
Further advantages and details of the invention are explained in greater detail with reference to the embodiment example illustrated in the diagrammatic figure.
The figure shows a driving wheel 1 of a vehicle according to the invention, for example a fork-lift truck, which is connected to a traction motor 2 and a brake disc 3, and to which a braking moment is to be applied to brake the vehicle.
The propulsion motor 2 is connected to a control device 4. The brake disc 3 and a brake pad 5 together form a mechanical brake 6 which together with a linkage 7 serving as transmitting device and a brake pedal serving as control member 8 forms a mechanical braking system B. A setting means 9 embodied as a (preferably analogue) force measuring device is located between the brake pedal (control member 8) and the linkage 7 and connected to the control device 4. As soon as the brake pedal is operated, a force is measured by the setting means 9, whereupon the control device 4 actuates the propulsion motor 2 so that an electric braking moment is produced by the latter in addition to the mechanical braking moment produced by the brake 6.
-4 Here, the actuation of the propulsion motor 2 is dependent on the force, i.e. an increasing electric braking moment is produced as the operating force on the brake pedal (control member 8) increases.
The braking moment applied in total is ideally predominantly generated electrically, whereas the mechanical braking moment component should be kept as small as possible.
The heating and the wear of the brake 6 are therefore kept small. In contrast, the braking operation is carried out predominantly free of wear by the electric brake. Here, it is possible to recover the major part of the braking energy and feed it into an electric traction battery (not shown) for example.
In place of the linkage 7, a hydraulic force transmitting device can also be provided between the brake pedal (control member 8) and the brake 6. In this case it is expedient if the setting means 9 is embodied as a pressure measuring device. It is also possible to use a travel measuring device as setting means 9 in place of a force or pressure measuring device, and the travel of the brake pedal, the linkage 7 or the brake pad 5 is measured.

Claims (5)

-5 CLAIMS
1. A vehicle, in particular an industrial truck with at least one electric propulsion motor which is connected to a control device and which can be operated in generator mode as an electric brake to brake the vehicle, and with a mechanical braking system which can be operated in combination with the electric brake, characterized in that the control device is connected to a setting means provided on the mechanical braking system such that the electric braking moment of the propulsion motor is dependent on a predetermined set value of operation of the mechanical braking system, and in which the electric breaking moment of the propulsion motor is set to its greatest possible value.
2. A vehicle according to claim 1, characterized in that the setting means (9) is embodied as a device for measuring the travel of a control member (8) of the mechanical braking system (B).
3. A vehicle according to claim 1, characterized in that the setting means (9) is embodied as a device for measuring the force of a control member (8) of the mechanical braking system (B).
4. A vehicle according to claim 1, characterized in that the mechanical braking system (B) exhibits a hydraulic force transmitting device between a control member (8) and a brake (6), and the setting means (g) is embodied as a pressure measuring device connected to the hydraulic force transmitting device.
5. A vehicle according to one of claims 1 to 4, characterized in that the setting means (9) is embodied as an analogue measuring system.
GB0210015A 2001-05-18 2002-05-01 Vehicle with an electrical and a mechanical brake Withdrawn GB2377564A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2001124344 DE10124344A1 (en) 2001-05-18 2001-05-18 Vehicle, especially warehouse vehicle, with electrical and mechanical brakes, has drive motor controller that interacts with mechanical braking system demand value generator

Publications (2)

Publication Number Publication Date
GB0210015D0 GB0210015D0 (en) 2002-06-12
GB2377564A true GB2377564A (en) 2003-01-15

Family

ID=7685339

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0210015A Withdrawn GB2377564A (en) 2001-05-18 2002-05-01 Vehicle with an electrical and a mechanical brake

Country Status (3)

Country Link
DE (1) DE10124344A1 (en)
FR (1) FR2824793A1 (en)
GB (1) GB2377564A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2977538B1 (en) * 2011-07-05 2013-08-16 Renault Sa MOTOR BRAKE SIMULATION

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4340131A (en) * 1979-12-28 1982-07-20 Elevator Gmbh Operational control system for lift and elevator machinery
GB2283129A (en) * 1993-10-13 1995-04-26 Mitsubishi Electric Corp Semiconductor laser module and method of assembly
US5497057A (en) * 1993-03-08 1996-03-05 International Business Machines Corporation Mechanical brake hold circuit for an electric motor
EP0758591A1 (en) * 1994-12-06 1997-02-19 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Braking control device for electric motorcar
EP1092584A1 (en) * 1998-06-30 2001-04-18 Nissan Diesel Co., Ltd. Brake device for car

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4340131A (en) * 1979-12-28 1982-07-20 Elevator Gmbh Operational control system for lift and elevator machinery
US5497057A (en) * 1993-03-08 1996-03-05 International Business Machines Corporation Mechanical brake hold circuit for an electric motor
GB2283129A (en) * 1993-10-13 1995-04-26 Mitsubishi Electric Corp Semiconductor laser module and method of assembly
EP0758591A1 (en) * 1994-12-06 1997-02-19 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Braking control device for electric motorcar
EP1092584A1 (en) * 1998-06-30 2001-04-18 Nissan Diesel Co., Ltd. Brake device for car

Also Published As

Publication number Publication date
DE10124344A1 (en) 2002-11-21
GB0210015D0 (en) 2002-06-12
FR2824793A1 (en) 2002-11-22

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)