DE2013079C3 - Digital control device for automatically switchable gearboxes in motor vehicles - Google Patents

Description

;;. ^ The addresses 6 υηά 7 have been deleted as real Unteranüch. The adder 22 controls over ■ O'swuche only Gulügkert and in connection with emem one preprogram according to gear change switching points several of the previous ^^ mized pulse sum selection 23 a gang recognition - ^ The proposed control device has opposite logic 27, which has a power stage 28 ^ ie for '«Above the known shifting device, the following forward 5 gearshift elements responsible for the selected gear ^ parts: elements, e.g. electrically controllable valves 36, 37, insensitive to temperature influences; controls.

y; .ff -., L. unciu | Miuuubu g & g & u 4. tmp ti cu iucimiusse,

V> ?: j.j2. compared to analog transmissions, ** ^ε * this version are used for the selection of the

&%. · Digital implementation of the switching points, more precise switch-off points, a second adder and a

^ "•" H-fl · detected; ¹⁰ second appropriately preprogrammed pulse sum

'νΐ & 3. The setting of the switching points is arranged for the equation selection 26. The second adder

"£ - '■ chen gear type possible in series in the ² ? Receives the frequency of the counting time clock generator 21

ti (". In contrast to analogue transmissions, which are counted in by a second counting time clock

> «5? Component tolerances are dependent; ^ra i ^or 24 is deleted at constant time intervals.

^J *. ^ *; - 4. greater immunity to interference; ¹ S With the second pulse sum selection 26 become

■ t-fc Ϊ * inputs, both analog and digital ^ ^he di ^e transition detection logic 27, the cut-off points

W £ i'- take place; definitely

'- ^ 6. the purely digital device can be expanded ^The individual gear or driving areas are

and can be linked to a central computer, ^te ' ^{s emes} selector switch 20 can be determined by the driver.

'which you for other devices of the Fahr ^{ao The} designations given in Fig. 9 have after-

Another example is the ignition system. following meanings:

Some embodiments are shown in the drawings ^: Backward travel;

men of the invention shown schematically; on hand 0: idle;

these drawings provide further details of the 35 A: Automatic;

<Invention Explained It shows: _B. Berefahrt - 'Fig. 1 the basic structure of the digital'

'Control in the block diagram; The embodiment according to FIG. 4 basically has the

as containing ξ Fig. 2 is a diagram for the pulse sum and the same structure shown in FIG. 3, but

* the cycle time over the individual gear shifting areas; 30 they are not a special group for determining the%; Shutdown points.

f FIG. 3 is a block diagram of the digital control system between the counting time clock generator 41

* Direction for automatically shiftable change gears; and the adder 43 a frequency divider 42 with i FIG. 4 the block diagram of a further execution constant divisor

\ rform of the control device; 35 The driving speed-dependent impulses are

* 'Fig. 5 shows the block diagram of the control device, in this embodiment, the adder 43 of * ■ according to Fig. 4, but with a changed input that is fed to a pulse generator48 in the gearbox47. The 'variable farm sizes; Adder 43 is in functional connection with

6 shows a further embodiment of the control of the pulse sum selection 44 for switching point adjustment according to Fig. 4 and 5. 40 choice and from there via the gear recognition 45 to

According to Fig. 1, a pulse power stage46 is in the transmission6, which the control current the switching

<her 7, in which the driving elements SS and 56 are fed by induction

i speed proportional impulses are generated. These pulses are switched in an adder 3 number of input variables fed 49 motor capacity, counted f The at certain time intervals I ₁ anlau- 45 SO road gradient, 51 acceleration, 52 curve ⁱ Fende pulse sum s will ride in a particular clock, S3 Engine and transmission temperature and 54 I time _{f 2} deleted. For this purpose, a counting time generator switching point shift to higher travel speed 2 is arranged. The cycle times T ₁ and t _{2 of} this counting range (kick-down) -Generator 41 supplied, whose operating parameters, such as engine power 8, temperature of the 50 clock frequency according to the inputs changing drive unit 9, inclination of the roadway 10 and borrowed A more detailed explanation of how to obtain the-I general shift of the gear shift points in these input variables is given below.

* higher driving speed ranges 11, depending. The preselector switch 40 has the following switch positions In the diagram, FIG. 2, the approaching lungs are on:

- Pulse sums s in the cycle times I ₁ or in the 55th

; different aisle areas above the drive R: backward travel;

; speed ν shown schematically. 0: idle;

Fig. 3 shows the block diagram of an embodiment 1: the first gear is preselected, another

'The form of the digital control device for automatic intrusion does not take place;

switchable gearbox. The structure of this pre-60 2: the second gear is preselected, the car direction corresponds essentially to that in FIG. 1 matic is when shifting up to 2nd gear Scheme shown: in the gearbox 29 a pulse is limited. A shift into higher gears Encoder 30 arranged, which does not take place from the Fahrgeschwindig-, however, a backwardness can emits dependent impulses. These impulses will shift from higher gears. this 'summed up in an adder 22 and from a 65 also applies to the switch position "1"; Payment time clock generator 21 in time intervals in A: automatic;

Dependence on the input variables 31, 32, 33, 34 B: Mountain position or automatic sports, i.e. H. all-

such as engine power, road inclination, etc., changeable gears are fully extended.

The design according to Figure 5 is similar to the structure 4, but the inputs are fed to the frequency divider 62, the divisor of which is changed in accordance with the input variables.

The frequency divider 62 is arranged between the counting clock generator 61 and the adder. The driving speed dependent impulses are fed to the adder 63 from a pulse generator 68 in the transmission 67. The adder 63 is connected to the selection of the switching points with the pulse sum selection 64, by which the gear recognition 65 is controlled. To create a sufficient control current for the switching elements 74 and 75 is between the gear recognition 65 and a power stage 66 is provided for the switching elements,

As already mentioned, in this embodiment the input variables are fed to the frequency divider 62, the divisor of which can be changed accordingly

The preselector switch 60 has the following switch positions:

R: backward travel;

0: idle;

1: preselection of the first gear; the automatic does not shift into higher gears, however from higher gears back to first gear;

2: second gear preselection; the automatic only shifts up to 2nd gear, but also down from higher gears;

A: automatic;

B: Ascent or automatic sports, i.e. all gears are fully extended.

The embodiment according to FIG. 6 shows the same structure as in FIGS. 4 and 5, but determine bier the constant frequency of the counting clock generator 81 and a constant divisor of the frequency divider 82 the pulse counting time for the pulse generator 88 in the adder 83 input pulses. The switch-on and switch-off points are determined by direct selection in the pulse sum selection 84,

to which the input variables are fed directly. The output from the pulse sum selection Values are transmitted to the gear shift elements 95 via a gear recognition logic 85 and a power stage 86 and 96 of the transmission 87 supplied.

The following input variables are fed to the pulse sum selection 84:

89 for the power of the drive motor; the input is made via the accelerator pedal position either inductively by changing the clock frequency or by means of contactless switches that control the pulse sum selection 84;

90 for the incline or slope of the roadway, for example in such a way that in a system of known communicating tubes in one of these tubes a float is provided, which is the core of an induction coil wearing;

91 for the acceleration, for example two from their rest position in opposite directions Directional movable pendulums are provided, one for positive and the other for negative Values;

92 for cornering, for example in a similar way as for acceleration Pendulum can be provided;

93 for the temperature of the drive system (engine and gearbox), temperature-dependent resistors can be provided for this;

94 for kick-down, i.e. H. Relocation of the switching points to higher speed ranges constant differences by pressing the accelerator pedal beyond the full throttle position, whereby For example, contactless switches are operated and the clock frequency is changed.

For an intended change of direction, a switching point can be shifted by operating the Indicator switch are initiated. On the other hand, a gear change is prevented when cornering at high speed.

For this purpose 3 sheets of drawings

Claims (7)

j. net that the individual functional parts are required to form a patent application combination of integrated semiconductor circuits. ^ discrete components are combined. 1. Digital control device for automatic
switchable gearboxes for motor vehicles
with a selector switch for preselecting the ^ «SS S ^ äf ^ ÄiÄgie? «SS The invention relates to a control device according to The switching command supplies the energy required, the generic term from PJW ^ J ^ jJ ^ V. . . ... characterized in that a pulse i. Known! Stars | * ^^ Scjgtw ^ tinig *? ^r encoder (7) is arranged for the delivery of automatic transmission (US-PS 34 48 640), in which the induction eleVgten, to the driving speed of the output speed proportional pulses by means of proportional pulses that an adder (3) of a frequency analog ^ Wanolers One of the vehicles is arranged to count in the pulses, so that the DC voltage assigned to the speed is arranged in reverse order to a time clock generator (2) which sets the 15. In addition to determining the switch-on and switch-off * pulse sum m the addienferk in certain points of the gear steps / a reference voltage is deleted that the values in an analog value comparator (comparator) attached to the counting time clock generator. The comparator itself transmits "! Leading input variables" requested engine-logic signals to a state-dependent logic, power, engine and transmission temperature, driving- »o The computer determines this logic based on the inclination of the track and" kick-down "for the purpose of shifters or others Sizes (preselection switch) the release of the gear shift points in a higher speed-related gear step. , w "·· i_ In addition, a digital torque measuring device is controlled by the adder and can be changed according to gear changes (Motortechnische Zeitschrift, 26th year, • switching points preprogrammed pulse sum- 95 p. 331), which regardless of its different structure, Mamenselektion (4 a ) with a gnetgeber connected to it as a pulse generator, and a gear recognition logic (4 b) is arranged. Corresponding counter and a quartz 2. Control device according to claim 1, da- timer which corresponds to a counting time clock characterized in that for the selection of the The object of the present invention is Switch-off points a second adder (25) for a control device for automatic gear shift counting to create the frequency of the first counting clock devices of motor vehicles, in the generator (21) is arranged that a second the input speed-dependent Im counting time clock generator (24) is arranged, which does not convert the pulse - as is known - into analog voltage pulse sum values are converted at a constant time interval, but into digital values, averages that one of the second adder 35 controlled this device independently of component tolerances The second after gear change shut-off points is because there are only two signals "On" and "Alis" th preprogrammed pulse sum selection (0 or 1) are to be transmitted. This task will (26) is arranged and that the pulse sum selection of the second by the invention specified in claim 1 determined values over solves. the gear recognition logic (27) of the performance 40 For explanation, it is added that in itufe (28) are supplied. In contrast to the pulse sum selection, the sequential 3. Control device according to claim 1, digital gear recognition logic, the selected pulses characterized in that between the adder stores and by means of time and state-dependent werk (43/63) and the counting clock (41/61) logic elements enable and disable the a frequency divider 45 gearbox is determined in a manner known per se. (42/62) is arranged. The claims 2 to S characterize in the context 4. Control device according to one of the claims of the invention lying variations, to which still before 1 and 3, characterized in that the following explanations are given: Counting time clock generator (61) with constant erasing time. Claim 2 is essentially about intervals and a frequency divider (62) with 50 the selection of the switch-off points, d. H. about the changeable Divisor are arranged and that was in a lower gear. However, it is fundamental Divisor variable is also possible depending on, with the help of the second counting time clock supplied input variables. generator, the second adder and the two 5. Control device according to one of the claims th pulse sum selection different up and before 1 and 3, characterized in that a 55 switch-off points, i.e. H. Resolution criteria of the outward counting time clock (81) with constant erasing time switching up and down the multiple pulse intervals and a frequency divider (82) with con sum selection, constantem in the gear recognition logic Divisor are arranged and that the to choose. Input variables for switching point selection immediately. According to claims 3 and 5 are frequency dividers can be fed directly to the pulse sum selection (84) 60 with a constant divisor for purely practical reasons, the arranged. There the frequency divider is supposed to 6. Control device according to one or more counting time clock that zugrunren of the control device of the preceding claims, thereby adapting the total pulse counting time, indicates that the individual functional parts to According to claim 4 is a frequency divider with unite integrated semiconductor circuit arranged together- 65 changeable divisor. This divisor becomes are taken. depending on the supplied digital inputs 7. Control device according to one or more input variables according to the laws of sequential wagons of claims 1 to 5, characterized marked gik changed.