SE527908C2 - Procedure and computer program for load distribution between the axles of a vehicle - Google Patents

Abstract

In a method of distributing load between at least two axles of a vehicle, the axle loads normally being at their respective normal values, vehicle speed and axle loads are sensed. At vehicle speeds = a first limit value, the load on at least one first axle is increased to a first predetermined value and the load on at least one second axle is decreased. If the load on said at least one second axle is = a second predetermined value, the increased load on said at least one first axle and the decreased load on said at least one second axle are maintained. If the load on said at least one second axle is <= the second predetermined value at vehicle speeds = a second limit value, the load on said at least one first axle is decreased to its normal value and the load on said at least one second axle is increased to its normal value.

Description

01 h) \ J u) C) G3 2 1 ..--- L1gs - rrn_ -kas the load on said at least one first axle and the load on said at least one second axle is reduced after the vehicle speed has been S said first limit value during a predetermined first time period.

In one embodiment, the load on said at least one first axle is reduced and the load on said at least one second axle is increased after the vehicle speed has been 2 said second limit value for a predetermined second time period.

In one embodiment, said second limit value 2 is said first limit value. The object is also achieved by means of a computer program for regulating the load distribution between at least two axles of a vehicle by regulating pressure in respective air bubbles associated with the axles, the axle loads normally being equal to their respective normal values, in that the computer program includes computer-readable program code elements they are operated in a computer, which is connected to an input terminal to receive a vehicle speed signal, to other input terminals of the output terminal mother of the bellows transmitter and with its output terminal to a valve assembly to regulate airflow to and from the air bellows , increasing the load on at least one first axle to a first predetermined value and decreasing the load on at least one second axle at vehicle speeds a first limit value, maintaining the increased load on said at least one first axle and the reduced load on said at least one second axle O m the load on said at least one second axis is 2 a second predetermined value and to reduce the load on said at least one first axis to its normal value and increase the load on said at least one second axis to its normal value if the load on said at least one second axis is <it second predetermined value at vehicle speeds 2 a second limit value. 10 20 25 01 h) \ J MD CD 0D 'i .1 lvícdel' the object and the computer program according to the invention, the tire cover will be greatly reduced on vehicles.

DESCRIPTION OF THE FIGURES The invention is described in more detail below with reference to the accompanying drawing, in which fi g. l is a schematic plan view of a vehicle with an embodiment of the invention and fi g. 2 is a flow chart illustrating steps in an embodiment of the method according to the invention.

DESCRIPTION OF THE INVENTION Fig. 1 is a schematic illustration of an embodiment of the invention for load distribution between a drive shaft 1 with double wheels 2 and a support shaft 3 with single wheels 4 of a vehicle (not shown in detail).

The vehicle can be a bus with or without a trailer, a truck with or without a trailer or a truck with a semi-trailer or a similar vehicle.

In the embodiment in fi g. In front of the drive shaft 1, on its own edge, place two air bellows 5, 5 'on the left side of the vehicle and two air bellows 6, 6' on the right side of the vehicle between the vehicle frame 7 and suspension beams 8.

For the support shaft 3, bellows 9 and 9 'are also provided in a manner known per se between the vehicle frame 7 and the support shaft 3 on each side of the vehicle.

The air bellows 5, 5 'and 6, 6' of the drive shaft 1 are connected by means of pipes 10 and 11, respectively, to electrically controlled valves (not shown) in a valve unit 12 which is supplied with pressure air from a heat source 13, for example a compressor, and air bellows 9 and 9 ' for the support shaft 3 are connected by means of pipes 15 and 16, respectively, to valves in the valve unit 12. 20 25 01 mwu: c: oo Å The electrically controlled valves in the valve unit 12 regulate the flow of compressed air to and from the air bellows 5, 5 ', 6, 6', 9, 9 'depending on control signals from a computer 17 via a cable bundle 18.

The computer 17 comprises a processor 19 which is connected to a computer program product 20 in the form of a memory unit which comprises a computer program 21 stored on a computer usable medium and another memory unit which stores a memory 22 for limit values.

The memory units can be, for example, ROMs, PROMs, EPROMs, EEPORMs or flash memories.

At the embodiments in fi g. 1, the processor 19 is connected to three input ports 23, 24, 25 and an output port 26 of the computer 17. It is understood that the computer 17 may include additional input and output ports.

The input port 23 of the computer 17 is connected via a line 27 to the respective output terminal of two pressure sensors 28, 29 which are connected to the air bellows 5 and 6, respectively, of the drive shaft 1 to sense the air pressure in the respective air bellows 5, 6 and supply air pressure data to the processor 19 via the input port. 23.

Based on the pressure data, the processor 19 calculates the load on the drive shaft 1 under the control of the computer program 21.

The input port 24 of the computer 17 is connected via a line 30 to the respective output terminal of two pressure sensors 31, 32 which are connected to the lu bellows 9 and 9 'of the support shaft 3, respectively, to sense the lu pressure in the respective air bellows 9, 9' and supply data regarding the lu pressure to the processor 19. via the input 24. 20 25 30 01 k) \ J \ DC) 00 CJ Uti __. n lLftn yck data, the processor 19 calculates the load on the support shaft 3 under the control of the computer program 21.

The input port 25 of the computer 17 is arranged to receive a vehicle speed signal S which indicates the speed of the vehicle.

In accordance with the invention, a first and a second predetermined vehicle speed limit value are set in the memory 22. The first vehicle speed gear value can be set to, for example, 30 km / h and the second vehicle speed limit value can be set to, for example, 60 km / h. It should be noted, however, that the second vehicle speed limit value may be the same as the first vehicle speed limit value.

In accordance with the invention, predetermined limit values for the drive shaft load and the support shaft load are also set in the memory 22.

Under normal conditions of the vehicle, the loads on the drive shaft 1 and the support shaft 3 are kept at normal values, which are determined by the air bellows. The air pressure is normally kept at the same value in all bellows 5, 5 ', 6, 6', 9, 9 'by means of the valve unit 12.

Referring to the fl fate schedule in fi g. 2, an embodiment of the method according to the invention will be described. 1 step S1 in fi g. 2 receives processor 19 in fi g. 1 data regarding the air pressure in the drive shaft air bellows 5, 6 via the inlet 23, data regarding the air pressure in the support shaft air bellows 9, 9 'via the inlet 24 and data regarding the vehicle speed via the inlet 25 of the computer 17.

It is assumed that the vehicle is stationary from the beginning in step S1. According to the invention, it is possible to reduce the tire wear, in particular on the wheels 4 on the support shaft 3 in the embodiment in fig. 1, for example when cornering in low haSIighBL, the load on the support shaft 3 is reduced at the same time as the load on the drive shaft 1 is increased to the predetermined value set in the memory 22.

To achieve this, in step S2 it is asked whether the vehicle speed is S the first limit value, i.e. 30 km / h in this embodiment, or not.

If the answer to the question in step S2 is NO, the shaft loads remain unchanged at their normal values.

If the answer to the question in step S2 is YES, the processor 19 in step S3, under the control of the computer program 21, regulates the valves in the valve unit 12 in such a way that air is released from the support shaft 3 bellows 9, 9 'via the pipes 15, 16 to reduce the air pressure in the support shaft bellows 9, 9 'and thereby reduce the support shaft load at the same time as lu fi is pressed into the air bellows 5, 5', 6 '6' of the drive shaft 1 via the pipes 10, ll to increase the lu fi pressure in the drive shaft lu fi bellows 5, 5 ', 6' 6 'and thereby increase the drive shaft load to the predetermined value set in memory 22. The emission of lu fl ur staaaxenuabaigm 9, 9 * is stopped when the pressure in iuabalgamå s, s: 6 'e' when they: predetermined pressure in correspondence to a maximum permissible load set in memory 22.

Preferably, the load on the drive shaft 1 is not increased and the load on the support shaft 3 is not reduced until the vehicle speed has been equal to or lower than 30 km / h for a predetermined first time period, for example a few seconds, in order to minimize air constriction.

In step S4 fi- whether the load on the support shaft 3 is 2 is a predetermined value set in the memory 22 corresponding to a load at which the operating characteristics of the vehicle are satisfactory. 20 25 30 01 N) '\ J \ D C) 0D. ~ L If the answer is IA on. In step S4, the increased drive shaft load and the lowered support shaft load are maintained from step S3.

If the answer is NO to fi rágan in step S4, i.e. the support axle load is <the predetermined value, fi- is applied in step S5 whether the vehicle speed is _> _ the second limit value set in memory 22, i.e. 60 km / h in this embodiment.

If the answer is NO to the question in step S5, the shaft loads from step S3 are maintained.

If the answer is YES to the question in step S5, i.e. the processor 19 has detected from the vehicle speed signal S via the input 25 that the vehicle speed is 2 60 km / h, the processor 19 in step S6, under control of the computer program 21, regulates the valves in the valve unit 12 in such a way that air is forced into the support shaft 3 lu fi bellows 9, 9 'via pipes 15, 16 to increase the air pressure in the support shaft air bellows 9, 9 'and thereby increase the support shaft load to their normal value at the same time as lu fi is released from the air bellows 5, 5', 6 '6' of the drive shaft 1 via the pipes 10, 11 to reduce the air pressure in drive axle bellows 5, 5 °, 6 '6' and thereby reduce the drive axle load to its normal value. The load distribution between the axles is thus back to the normal distribution.

Preferably, the load on the support shaft 3 is not increased and the load on the drive shaft 1 is not reduced until the vehicle speed has been equal to or higher than 60 krn / h during a predetermined second time period which may be as long as the first time period, i.e. a few seconds, in order to minimize lu. consumption.

The pressures in the air bellows 5, 5 ', 6' 6 'and 9, 9' will then be maintained at their respective normal values until the processor 19 next time in step S2 detects that the vehicle speed is again equal to or lower than 30 km / h, i.e. the first speed limit value set in memory 22. 20 cn h.) -1 ND CD Oo (73 As mentioned above, the second speed limit value may be equal to or higher than the thirstiest speed limit value.

By means of the invention, the tire wear will be reduced on the support shaft in particular in the form of drying described.

The design is equally applicable to vehicles with a bogie with more than two axles.

For example, in the case of a bus with service weight, i.e. an empty bus with a driver, with a total mass of 14300 kg, the load is distributed as follows: front axle 4200 kg, drive axle 5800 kg and support axle 4300 kg.

When the invention is applied, i.e. at low speeds, for example at a vehicle speed of SEK 5 30 / h, the load is distributed as follows: front axle 3400 kg, drive axle 95 00 kg (predetermined value) and support axle 1400 kg.

This implies a reduction of the support axle load by almost 70%, which means that the wear on the support axle tires will decrease

Claims (6)

10 20 25 30 UT k) \ J \ D C) OD I-'ATENFKRAV Procedure for load distribution between at least two axles of a vehicle, where the axle loads are normally equal to their respective normal values and where - vehicle speed and axle loads are sensed, - the load is increased on at least a first axle to a first predetermined value and decreased on at least a second axle at vehicle speeds S a first limit value, - the increased load on said at least one first axle and the reduced load on said at least one second axle are maintained if the load on said at least one second axle is _> _ a second predetermined value and there - the load on said at least one first axle is reduced to its normal value and the load on said at least one second axle is increased to its normal value if the load on said at least one second axle is <the second predetermined value at vehicle speeds 2 a second limit value, characterized in that the load is increased on said at least one first axle and is reduced on said rninst a second axle after the vehicleh has been the said first limit value for a predetermined first time period. The method according to claim 1, characterized in that the load on said at least one first axle is reduced and the load on said at least one second axle is increased if the vehicle speed has been 2 said second limit value for a predetermined second time period. The method according to any one of claims 1 - 2, characterized in that said second limit value is 2 said first limit value. Computer program (21) for regulating the load distribution between at least two axles (1, 3) of a vehicle by regulating pressure in respective air bellows (5, 5 °, 6, 6 ', 9) associated with the axles (1, 3). 9 '), wherein the axis loads are normally equal to their respective normal values, and wherein computer-readable program code elements 20 un m -.1 u: c: os A lu as when in a computer (17), which is connected m. .. .n Terminal block (25) for receiving a vehicle speed signal (S), with other input terminals (23, 24) to output terminals of lu 'bellows pressure sensors (28, 29, 31, 32) and with its output terminal (26) to a valve unit (12) ) to regulate lu de fate to and from the lu fi bellows (5, S °, 6, 6 °, 9, 9 °), cause the computer (17) to - detect vehicle speed and axle loads, - increase the load on at least one first axle (l) to a first predetermined value and reduce the load on at least one second axle (3) at vehicle speeds _ <_ a first limit value, - maintain the increased load n on said at least one first axis (1) and the lowered load on said at least one second axis (3) if the load on said at least one second axis (3) is 2 a second predetermined value and - reducing the load on said at least one first axis (1) to its normal value and increase the load on said at least one second axle (3) to its normal value if the load on said at least one second axle (3) is <the second predetermined value at vehicle speeds 2 a second limit value, characterized by the computer program comprises computer readable program code elements which when run in a computer (17) cause the computer (17) to increase the load on said at least one first shaft (1) and decrease the load on said at least one second shaft (3) after the vehicle speed has been S said first limit value for a predetermined first time period. The computer program (21) according to claim 4 and comprising computer readable program code elements which when run in a computer (17) cause the computer (17) to reduce the load on said at least one first axis (1) and increase the load on said at least one second axle (3) after the vehicle speed has been _> _ said second limit value for a predetermined second time period. A computer program product (20) comprising a computer program according to claim 4 and a computer usable medium on which the computer program is stored. 01 k) \ J \ DC) GD 11 "Date: f 1 7) * mm-H ad send mire signals to a valve unit (12) and comprising I. ßuvnmnm of .. _.- ___ a memory unit and one in the memory unit stored computer program according to claim 4.