EP0782664A1 - Dispositif d'entrainement des accessoires d'un moteur a combustion interne de vehicule automobile - Google Patents
Dispositif d'entrainement des accessoires d'un moteur a combustion interne de vehicule automobileInfo
- Publication number
- EP0782664A1 EP0782664A1 EP95931250A EP95931250A EP0782664A1 EP 0782664 A1 EP0782664 A1 EP 0782664A1 EP 95931250 A EP95931250 A EP 95931250A EP 95931250 A EP95931250 A EP 95931250A EP 0782664 A1 EP0782664 A1 EP 0782664A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive device
- speed
- accessories
- drive
- variator
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
- F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
- F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
Definitions
- the present invention relates to internal combustion engines of motor vehicles.
- These engines drive accessories, such as the alternator, the hydraulic pump of the power steering device, the compressor of the air conditioning device, etc., via a belt device whose transmission ratio is fixed.
- the alternator rotates at too high a speed, which reduces its efficiency.
- the compressor of the air conditioning device it is desirable to drive it only when the air conditioning device is used and this according to the conditions of use and with a variable transmission ratio so that it operates in conditions close to its optimum yield.
- the present invention proposes to provide a device for driving the accessories of an internal combustion engine which makes it possible to drive the various accessories at an optimum speed of rotation and only when they are used.
- the subject of the present invention is a device for driving the accessories of the internal combustion engine of a motor vehicle, such as in particular the alternator, the hydraulic pump of the power steering device, the compressor of the air conditioning device. , characterized in that it comprises a drive member with variable transmission ratio which is driven by the crankshaft and which drives the various accessories and a processor which controls this drive member so that the accessories are driven at a speed proportional to the speed of rotation of the crankshaft as long as the latter is less than a threshold value, and at an optimal speed when the speed of the crankshaft is greater than this threshold value.
- the transmission member comprises at least one device for deactivating an accessory controlled by the processor.
- the deactivation device can consist of a mechanical or electromagnetic clutch, the disengagement of which is controlled by the processor.
- the alternator it consists of a device for suppressing the excitation current.
- the drive member is constituted by a V-belt variator.
- the drive member is constituted by a hydrostatic variator comprising a displacement pump variable supplying at least one hydraulic motor with constant displacement.
- the drive member is a toroidal variator made up of two concave toroidal surfaces facing each other on which one or more hemispherical elements are supported, the inclination axis defines the transmission ratio.
- the drive member is a variator having a finite number of transmission ratios.
- the drive member is a variator having two transmission ratios and the processor controls the passage from a transmission ratio to
- the optimal gear change threshold and the shift threshold is the largest of the threshold values of all the accessories.
- an optimal threshold value is determined taking into account the operation of the motor at zero load. In the event of low or no load operation of all the accessories, the second transmission ratio is selected.
- FIG. 2 is the block diagram of an embodiment of the invention
- FIG. 3 schematically represents an engine equipped with a device according to the invention
- crankshaft 2 drives a drive member with variable transmission ratio consisting of a variator 3, such as a V-belt variator , at the outlet of which is fixed an accessory casing 4 which drives, by means of n clutches 5, n different accessories 6.
- a variator 3 such as a V-belt variator
- Each accessory is driven at a specific speed of rotation til, tl2,. . . tin.
- the device also comprises a processor, such as a microcomputer 7, which receives operating data coming from the various accessories 6, by means of an electronic circuit 9 such as a multiplexer, and information concerning the engine speed and coming from the crankshaft 2
- a processor such as a microcomputer 7, which receives operating data coming from the various accessories 6, by means of an electronic circuit 9 such as a multiplexer, and information concerning the engine speed and coming from the crankshaft 2
- This processor calculates, from the operating and speed data, set values used to control the values of the transmission ratios for each accessory, on the basis of a program stored in the processor. These set values are sent to an electronic circuit 8 which develops the ordering instructions and distributes them to drive 3 and clutches 5.
- the variator 3 is permanently driven by the motor at a speed __m proportional to the engine speed and it provides at output on at least one output shaft a speed t.va controlled by the processor 7.
- the accessories casing 4 comprises several output shafts rotating at different speeds tin wire.
- the different accessories 6 are therefore driven at different speeds, each via a clutch 5 which makes it possible to deactivate the corresponding accessory when it is not in use.
- each accessory can be driven at a specific speed which is adapted to its technical characteristics and its operating conditions, each accessory being able to be uncoupled when not in use.
- the strategy for controlling the drive speed of each accessory is as follows.
- Each accessory is driven at a speed proportional to that of the motor as long as the latter is not greater than a predetermined threshold.
- a predetermined threshold When the engine speed is above this threshold, each accessory is driven at a constant speed independent of the engine speed; this constant speed is optimized by processor 7 according to a calculation algorithm and operating data.
- the variator can be + a V-belt variator allowing to provide a constant speed by acting on a pulley. This can be achieved by acting hydraulically by means of a piston.
- the algorithm for calculating the drive speed makes it possible to obtain the optimal speed taking into account the operating conditions so as to greatly reduce the power absorbed by the accessories, especially at high speed, and consequently to increase the efficiency. overall engine.
- FIG. 2 schematically represents an embodiment of the invention.
- the crankshaft drives a drive member 11 with two transmission ratios so as to drive an alternator 12 at a speed ⁇ l a pump power steering 13 at a speed ⁇ 2, and an air conditioning compressor 14 at a speed ⁇ 3.
- the pump 13 is driven by means of a deactivation device constituted by a clutch 15.
- the deactivation device is constituted by a device for removing the excitation current.
- the deactivation device is constituted by a clutch 16.
- FIG. 3 schematically represents an engine 1 equipped with an accessory drive device in accordance with the present invention, there is the processor 7, the converter with two transmission ratios 11, the alternator 12 which is driven at speed ⁇ l, the power steering pump 13 which is driven at speed ⁇ 2, and the air conditioning compressor 14 which is driven at speed ⁇ 3, these last two accessories being driven together by the same belt.
- the two transmission ratios of the device 11 are used in the following manner.
- the first gear is used for low regimes with a gear overall to ensure the benefits of the acces ⁇ soire in idle as in the case of a fixed ratio drive.
- the second ratio of the variator 11 reduces the overall drive ratio of each accessory for high speeds so as to operate the accessory at a speed for which its performance is optimal.
- the control unit manages the gear changes of the converter 11, acts on the clutch 15 of the pump 13 and cuts the excitation according to the services requested for each accessory, namely:
- FIG. 4 represents the law for changing the gear change regime as a function of the electrical balance as regards the alternator.
- the evaluation of the electrical balance consists in comparing the average value of the Ubatmoy battery voltage with a nominal battery voltage Ubatnom and in incrementing or decrementing the value Cnt of an up-down counter, this value Cnt constituting an image of this balance electric.
- the average voltage is calculated as follows based on the instantaneous value of the Ubat battery voltage:
- Ubatmoyi + 1 Ubatmoyi + f (Ubati + l - Ubatmoyi)
- the electrical balance or value of the up-down counter is calculated as follows: if Ubat ⁇ Ubatnom
- the value Cnt of the up-down counter is between 0 and 255; f is a voltage filter and a and b are coefficients which are chosen to obtain the desired sensitivity.
- the speed of change of ratio fis varies between two values ⁇ smin and ⁇ saltmax for values of electrical balance between two values Cnti and Cnt2 according to the law described in figure 4. If Cnt is greater than Cnt2, the speed ⁇ s is equal to ⁇ smin and if Cnt is less than Cnti, it is equal to ⁇ saltmax.
- the minimum value ⁇ smin is set so as to comply with the minimum speeds of the alternator and the power steering.
- the maximum value ⁇ saltmax is calculated so as to ensure a satisfactory electrical balance for maximum power consumption, and must be less than the value ⁇ smax corresponding to the maximum speeds of the accessories.
- FIG. 5 shows the law for changing the gear change regime in order to improve the performance of the air conditioning device. These are calculated as a function of the duration of consecutive actuation of the compressor, Tcli, Ide, the temperature of the interior and its evolution over time. The performance of the air conditioning system is considered insufficient if the following three conditions are met:
- the duration of actuation of the compressor is greater than a reference duration:
- the cabin temperature is higher than the comfort temperature: ⁇ hab> ⁇ habno - the temperature variation during the time unit ⁇ t is less than the nominal variation
- the minimum threshold speed is fixed at a value ⁇ sb greater than or equal to ⁇ smin.
- the threshold speed increases by a quantity d ⁇ scli periodically, the period being equal to Tclimax, as can be seen in FIG. 5.
- the maximum speed is fixed at a value ⁇ smax which is compatible with the maximum speeds of all the accessories, and which is greater than or equal to ⁇ saltmax.
- the gear change regime also takes into account the engine load.
- the final gear change speed is determined as follows.
- the transition from the first report RI to the second report R2 is carried out for an engine speed, ⁇ mot, greater than or equal to ⁇ sl and the reverse change is made for an engine speed less than or equal to ⁇ s2 as shown in Figure 6.
- the value of ⁇ s chosen will be supplied to this computer so that it can anticipate the injection command.
- the drive device control algorithm includes a strategy for deactivating accessories; the power steering pump is engaged when steering assistance is required:
- the pump clutch control is delayed.
- the excitation current of the alternator can be cut as shown in FIG. 7 which is a curve of the excitation current as a function of time.
- the drive report chosen is the "economic" report, namely the second report R2.
- the transmission ratio is blocked at the value R2 so as not to damage the accessories at high speed.
- the invention makes it possible to operate the accessories under optimal conditions while avoiding excess consumption of the engine and protecting the accessories, in particular the alternator, for the extreme engine speeds.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Transmission Device (AREA)
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9411360 | 1994-09-23 | ||
FR9411360A FR2724881B1 (fr) | 1994-09-23 | 1994-09-23 | Dispositif d'entrainement des accessoires d'un moteur a combustion de vehicule automobile |
PCT/FR1995/001186 WO1996009464A1 (fr) | 1994-09-23 | 1995-09-15 | Dispositif d'entrainement des accessoires d'un moteur a combustion interne de vehicule automobile |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0782664A1 true EP0782664A1 (fr) | 1997-07-09 |
EP0782664B1 EP0782664B1 (fr) | 1998-05-20 |
Family
ID=9467206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95931250A Expired - Lifetime EP0782664B1 (fr) | 1994-09-23 | 1995-09-15 | Dispositif d'entrainement des accessoires d'un moteur a combustion interne de vehicule automobile |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0782664B1 (fr) |
JP (1) | JPH10505890A (fr) |
DE (1) | DE69502623T2 (fr) |
FR (1) | FR2724881B1 (fr) |
WO (1) | WO1996009464A1 (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE505200C2 (sv) * | 1996-08-30 | 1997-07-14 | Scania Cv Ab | Buss med luftkonditionering |
FR2763901B1 (fr) * | 1997-06-02 | 1999-07-23 | Renault | Dispositif d'entrainement des accessoires d'un moteur a combustion interne d'un vehicule automobile |
DE19728723A1 (de) * | 1997-07-04 | 1999-01-07 | Bayerische Motoren Werke Ag | Antriebsaggregat für Kraftfahrzeuge |
JP2005323425A (ja) | 2004-05-07 | 2005-11-17 | Denso Corp | 車両用発電システム |
DE102005013027A1 (de) | 2005-03-22 | 2006-10-26 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Antriebsstrang für einen Kompressor und eine Hydraulikpumpe |
DE102006033428A1 (de) | 2006-07-19 | 2008-01-31 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | System mit einem Verdichter und einem Verbraucher in einem Kraftfahrzeug |
CN101952589B (zh) | 2008-06-04 | 2016-01-20 | 克诺尔商用车制动系统有限公司 | 为商用车辆供给压缩空气的压缩机系统和用于运行压缩机系统的方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2703094A1 (de) * | 1977-01-26 | 1978-07-27 | Bosch Gmbh Robert | Antrieb fuer die nebenaggregate einer brennkraftmaschine, insbesondere in kraftfahrzeugen |
EP0135790A3 (fr) * | 1983-09-29 | 1986-12-03 | Canadian Fram Limited | Mécanisme de contrôle de l'entraínement d'accessoires |
EP0136384A1 (fr) * | 1983-10-03 | 1985-04-10 | Canadian Fram Limited | Accouplement pour poulie de vilebrequin de moteur |
US4938732A (en) * | 1989-06-13 | 1990-07-03 | Gkn Automotive, Inc. | Continuously variable transmission system having variable diameter pulley assemblies responsive to axially directed forces |
DE4230581A1 (de) * | 1992-09-12 | 1994-03-17 | Schlattl Werner Bavaria Tech | Variator für Drehantriebe |
-
1994
- 1994-09-23 FR FR9411360A patent/FR2724881B1/fr not_active Expired - Fee Related
-
1995
- 1995-09-15 JP JP8510640A patent/JPH10505890A/ja not_active Ceased
- 1995-09-15 EP EP95931250A patent/EP0782664B1/fr not_active Expired - Lifetime
- 1995-09-15 WO PCT/FR1995/001186 patent/WO1996009464A1/fr active IP Right Grant
- 1995-09-15 DE DE69502623T patent/DE69502623T2/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9609464A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH10505890A (ja) | 1998-06-09 |
WO1996009464A1 (fr) | 1996-03-28 |
DE69502623T2 (de) | 1999-01-28 |
EP0782664B1 (fr) | 1998-05-20 |
FR2724881B1 (fr) | 1997-01-03 |
DE69502623D1 (de) | 1998-06-25 |
FR2724881A1 (fr) | 1996-03-29 |
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