DE102007002539A1 - System for control of transmission unit of vehicle, comprises two inlets and two stop positions - Google Patents

Abstract

The control device (100) for the transmission unit comprises a cylinder (105) with two inlets (110,120) and a piston (130) moving between two stop positions (150,160) inside the cylinder (105). A first flow (F1) is guided through the first inlet (110) before the control unit (100) initiates the motion of the fluid (F2) through the second inlet (120) when the piston (130) is positioned in the second final position (160). The first flow (F1) pushes the piston (130) in a first direction (150) while the second flow (F2) directs the piston (130) towards the second position (160). Independent claims are given for a vehicle with the transmission system installed, a method for the control of the system, a computer program suitable for the control of the individual steps, and a device for saving the program on.

Description

background the invention and the prior art

The The present invention relates generally to transmission shifting devices. The invention particularly relates to a transmission control system according to the preamble of claim 1 and a motor vehicle according to claim 8. The invention also relates to a method of controlling a transmission operating device according to the preamble of Claim 9, a computer program according to claim 16 and a computer readable Medium according to claim 17th

at an actuation the gear shift device in automatic transmissions, automated manual transmissions and other types of automatically controlled Can be driven uncomfortable bumps and noises occur. Although this is not usually the risk of deterioration means the transmission system of the vehicle, the driver and / or the Passengers in the vehicle feel the bumps and noises as annoying. Therefore, different solutions have been developed to this To face the problem.

US 5,669,265 describes an arrangement for a gear change operation by means of a construction which includes a two-stage cylinder. An inner cylinder is here movable with an outer cylinder. As a result, both a first piston movement can take place relatively quickly, as well as a final phase movement of the piston take place relatively slowly. As a result, for example, a gear change with respect to a synchronous gear change gear can be performed both smoothly and efficiently. GB, 983 271 discloses a similar solution, according to which a smooth gear change is implemented by using a two-stage cylinder and piston assembly.

WO90 / 03523 describes an alternative solution for damping a gear change device at its end position. Here is one Back pressure chamber as an annular Groove formed in the piston front, which is opposite to the cylinder end. The chamber contains Compressed air over a narrow passage is omitted when the piston is the end achieved, whereby the impact of the piston is reduced. The Back pressure chamber is radially inward arranged with respect to the cylinder wall, so that the piston rings around the circumference of the piston are unaffected by the high back pressure.

Yet The previous designs for piston damping are all mechanically complex. Hence the solutions comparatively error-prone and / or expensive to realize.

Summary the invention

The The object of the present invention is therefore to provide a solution the a reliable, provides a cost-efficient and uncomplicated transmission control means, that a uniform and low-noise Owns behavior.

According to one Aspect of the invention is the object by the above-described Gearbox control system solved, wherein the transmission control unit is configured to the transmission operating device to operate in this way that when the piston is in the first end position, and the at least one transmission control command indicates that the piston to move to the second end position, the first fluid flow is caused to be supplied through the first inlet before the second Fluid flow is caused to be supplied through the second inlet. Similarly, the control unit is designed to operate the transmission actuator operate such that when the piston in the second End position and indicating at least one transmission control command, that the piston is to be moved to the first end position, the second Fluid flow is caused to be supplied through the second inlet before the first fluid stream is caused to be supplied through the first inlet.

One The decisive advantage of this system is that it has a very uncomplicated cylinder and piston construction for operation the transmission switching device allowed. Since the proposed damping the reduces mechanical stress on the cylinder body, the transmission actuator also made of a material of relatively small thickness be. About that can out already existing transmission control systems are easily adapted, to implement the proposed system.

According to embodiments According to this aspect of the invention, the transmission control unit is designed to the transmission actuator to operate such that (i) the supply of the first fluid stream no later than is then terminated when the supply of the second fluid flow is triggered (possibly will ever no fluid flow to the cylinder body while a period before triggering supplied to the supply of the second fluid stream), or (ii) the supply of the second fluid flow is triggered before the supply of the first Fluid flow is interrupted.

Depending on the implementation and desired relationship between speed and damping, one of these alternatives may be advantageous. Generally, the damping effect is achieved by shortening the interval between the first and second fluid flows increased and vice versa. The actual damping effect is in fact determined by the relationship between the total fluid amounts delivered by the first and second inlets, respectively. As a result, the damping effect can also be adjusted by controlling the fluid flow magnitudes.

According to others embodiments According to this aspect of the invention, the transmission control unit is accordingly lists around the transmission actuator such that (a) the first and second fluid flows substantially identical stationary orders of magnitude (English: steady-state magnitudes) possess, (b) the first fluid flow a stationary-magnitude owns, which is bigger as a steady-state order the second fluid stream, or (c) the second fluid stream of a stationary order of magnitude owns, which is bigger as a steady-state order of the first fluid stream.

According to one Another aspect of the invention, the object is achieved by the beginning described motor vehicle solved, which includes the system proposed above.

According to one Still another aspect of the invention is achieved by the solved by the method described above, wherein the method Trigger comprising a supply of the first fluid flow through the first inlet, before the delivery of the second fluid stream through the second inlet is triggered, when the piston is in the first end position and to the second end position to move. Naturally, the method includes depending on what as the first respective dependent End position is defined, as much triggering the supply of the second Fluid flow through the second inlet before the supply of the first Fluid flow through the first inlet is triggered when the piston located in the second end position and to the first end position to move.

outgoing from the previous discussion with regard to the proposed Vehicle arrangement are the advantages of this method as well the preferred embodiments of it obviously.

According to one Another aspect of the invention, the object is achieved by a computer program that can be loaded directly into the internal memory of a computer, which software for controlling the method proposed above if the program is running on a computer.

According to one Another aspect of the invention is the object by a computer-readable medium solved, which has a program stored on it, the program a computer causes the method proposed above to control.

Short description the drawings

The The present invention will now be described in more detail by means of embodiments, which are disclosed as examples and with reference to the accompanying drawings explained.

1a -d illustrate the basic principle of operation of a transmission operating device according to an embodiment of the invention;

2a 5c are graphs showing further embodiments of the operating principle of the device in FIG 1a -d illustrate;

3 schematically shows a motor vehicle comprising a transmission control system according to an embodiment of the invention; and

4 shows a flow chart, which illustrates the basic method according to the invention.

description the embodiments the invention

We refer to the beginning 1a that a transmission actuator 100 according to an embodiment of the invention. The Getriebebetätigungsvor direction 100 is designed to cause at least one gear shift with respect to a transmission, ie, for example, to change gears (up or down), or to switch between a high and low speed range. 1b FIG. 3 d show later phases of an actuation process according to an embodiment of the invention which is shown in FIG 1a was initiated.

The device 100 includes a cylinder body 105 who has a first intake 110 and a second inlet 120 for receiving a first fluid flow F1 and a second fluid flow F2. The fluid flows F1 and F2 can be realized by compressed air (as well as by other gases) or by a hydraulic fluid. 2a c represent the fluid flows F1 and F2 as functions over time according to different embodiments of the invention.

Now you turn to 1a back, so is a control piston 130 between a first end position 150 and a second end position 160 inside the cylinder body 105 movable. The piston 130 goes towards the first end position 150 as the result of the first fluid flow F1 and in the direction of second end position 160 as the result of the second fluid flow F2 moves. A piston rod 140 is with the piston 130 connected, and preferred is an actuator 145 at the distal end of the piston rod 140 appropriate. The Member 145 is again designed to affect a first gear function when it is at a first position A with the piston 130 corresponds, which is in the first end position 150 and a second transmission function when in a second position B with the piston 130 corresponds, which is in a second end position 160 located. Thus shows 1a a situation in which the first transmission function is activated. Now, at time t = 0, we assume that the transmission actuator 100 to trigger the second transmission function. According to the invention, the first fluid flow F1 is first through the first inlet 110 promoted, so that the first area of the cylinder body 105 to which the piston 130 is to be moved, is placed under form. This leads namely to the desired damping effect with respect to the piston movement.

Then at a later time t = t ₁ , the second fluid flow F2 through the second inlet 120 promoted. This situation will be in 1b shown. At time t = t ₁ , the first fluid flow F1 may either be stopped, as in FIG 2a shown, or it may continue, as in 2c shown. As a further alternative, the first fluid flow F1 may already have been discontinued before t = t ₁ . This embodiment of the inventions is in 2 B shown.

After t = t ₁ , since the second fluid flow F2 continues to move into the cylinder body 105 is conveyed into, the control piston 130 , the piston rod 140 and the triggering link 145 in a direction SD to the second end position 160 or the second position B. 1c shows a phase at a slightly later time t = t ₂ during this movement. An opposite fluid flow from the first inlet 110 out here is designated F3. Last, at a time t = t ₃ , were the positions 160 and B reaches, and the piston 130 stops. This phase is in 1d shown. In this case, the fluid streams may be interrupted.

If we now too 2a Returning to Figure 5, we see a graph of the above-discussed fluid flows as functions over time. The vertical axis corresponds to a flow quantity f (English: flow magnitude), and the horizontal axis shows the time t. The first fluid flow F1 / F3 is represented here by means of a dashed line, while the second fluid flow F2 is represented by a solid line. As in 2a can be seen, the first fluid flow F1 is interrupted by t = t ₁ , ie when the supply of the second fluid flow F2 is triggered. Thus, the opposite flow F3 from the first inlet 110 out equally around t = t ₁ . Provided that the first and second inlets 110 and 120 each have the same or at least comparable characteristics (eg with regard to flow resistance), F2 ≈ F3. In this embodiment of the invention, the first fluid flow F1 has a steady-state magnitude f1 which is greater than a steady-state magnitude f2 of the second fluid flow F2. In a positive flow direction in the cylinder body 105 in, the fluid flow F3 has a steady-state order -f3, which has approximately the same absolute magnitude of the stationary order f2 of the second fluid flow F2.

2 B FIG. 12 is a diagram of an embodiment of the invention wherein the actuation process includes a period during which no fluid flow to the cylinder body. FIG 105 is supplied before the supply of the second fluid flow F2 is triggered. At time t = t ₁₁ (where t ₁ > t ₁₁ > 0), the first fluid flow is already interrupted. Accordingly, the cylinder body receives 105 during t = t ₁₁ to t = t ₁ no fluid flow through the inlets 110 or 120 , Instead, a small amount of fluid flows out of the first inlet during this period 110 in the form of a fluid flow F3.

Then, at a time of t = t ₁ , the actuation process is analogous to that described above with respect to FIG 2a described process. Here, however, the first and second fluid streams F1 and F2 have substantially identical steady-state magnitudes f1 and f2, respectively.

2c FIG. 12 is a diagram of an embodiment of the invention wherein, unlike the embodiments described above, the actuation process includes a period during which the first and second fluid flows F1 and F2 intersect at time t. Consequently, the supply of the second fluid flow F2 is triggered before the supply of the first fluid flow F1 is interrupted. Specifically in this example, the first fluid flow lasts until t = t ₂₁ (where t ₂₁ > t ₁ ). Thus, the cylinder body "gets" 105 Fluid flows through both inlets 110 and 120 during a period t = t ₁ to t = t ₂₁ . Of course, the total fluid flow in terms of the cylinder body 105 always 0, provided that the cylinder body has no fluid openings other than these inlets 110 and 120 has. Accordingly, the first inlet 110 output an outgoing current (ie, F3) at time t ₁ <t <t ₂₁ , for example, if f 2> f ₁ , as in FIG 2c shown. From the time t = t ₂₁ and further, the actuation process is analogous to that described above with regard to 2a described process. Nevertheless has the second fluid flow F2 in the embodiment, which in 2c a steady-state magnitude f2 greater than a steady-state magnitude f1 of the first fluid flow F1 is shown.

As previously mentioned, is any combination according to the invention of relations between the stationary magnitudes f1 and f2 with respect to the triggering time of the second fluid flow F2 relative to the cancellation of the first fluid flow F1 conceivable, as described above. These are design parameters, due to the respective claims to the implementation selected become.

3 schematically shows a motor vehicle 100 , which incorporates a transmission control system according to an embodiment of the invention. This system includes a transmission 320 and a transmission control unit 330 ,

The gear 320 in turn is at a drive of the vehicle 300 appropriate. Typically, this means that the transmission 320 a mechanical connection 325a to a power source, such as a motor 310 , and another mechanical connection 325b to a wheel drive axle 340 owns, so a driving moment from the power source 310 to the axis 340 over the transmission 320 can be transferred. The gear 320 also has a gearbox bebetätigungsvorrichtung 100 , which is designed to at least one gearshift with respect to the transmission 320 cause. The transmission actuator 100 turn, as above with regard to 1a -d described be constructed.

The transmission control unit 330 is implemented to provide the transmission operating device 100 with regard to at least one transmission control command (not in FIG 3 shown). This command can either be triggered manually, for example if the gearbox 320 manual type, or can be generated automatically when, for example, the transmission 320 automatic style is. The transmission control unit 330 is further designed to the transmission actuator 100 according to the above with regard to 1a -d and 2a -d described actuation process. Thus, the transmission control unit causes 330 the first fluid flow F1, through the first inlet 110 to be supplied, before it causes the second fluid flow F2, through the second inlet 120 to be fed when the piston 130 in the first end position 150 and the at least one transmission control command indicates that the piston 130 to the second end position 160 to move. Similarly, the transmission control unit causes 330 the second fluid flow F2, through the second inlet 120 to be supplied, before it causes the first fluid flow F1, through the first inlet 110 to be fed when the piston 130 in the second end position 150 and the at least one transmission control command indicates that the piston 130 in the first end position 160 to move.

Preferably, the transmission control unit includes a computer readable medium 335 or is associated with this, which is a program for controlling the unit 330 stores according to the proposed principle.

In summary, the basic method according to the invention for controlling the transmission actuating device will now be described with reference to the flowchart of FIG 4 described.

A first step 410 checks whether the switching piston is to be moved (ie either from the first end position to the second or from the second end position to the first) or not. If no such command has been received, the process loops back and remains at the step 410 , Otherwise, a step follows 415 , This step 415 checks whether the switching piston is currently in the first end position and, if so, a step follows 420 , Otherwise, ie when the switching piston is currently in the second end position, a step follows 440 ,

The step 420 releases a supply of the first fluid flow F1 through the first inlet 110 in the cylinder body 105 As a result, depending on the implementation, either one step follows 425 which stops the first fluid flow F1 or a step follows 430 wherein a supply of the second fluid flow F2 through the second inlet 120 in cylinder body 105 is triggered into it. In any case, the step becomes 425 completed, before the process becomes a next step 435 continues. This step 435 checks whether or not the switching piston has reached the second end position, and if so, the process loops back to the step 410 , Preferably, a sensor detects whether the piston has reached the end position, or a timer is used. In the latter case, the step checks 435 whether the timer has expired or not. If in the step 435 it has been determined that the control piston has not yet reached the second end position, the process loops back to the step 430 for further supply of the second fluid flow F2.

The step 440 triggers a supply of the second fluid flow F2 through the second inlet 120 in the cylinder body 105 into it. Then, depending on the implementation, either a step follows 445 which stops the second fluid flow F2, or a step follows 450 , wherein a supply of the first fluid flow F1 through the first inlet 110 in the cylinder body 105 is triggered into it. In any case, the step becomes 445 completed before the process becomes a next step 455 continues. This step 455 checks whether the switching piston has reached the first end position or not, and if so, the process loops back to the step 410 , Preferably, a sensor detects whether the piston has reached the end position, or a timer is used. In the latter case, the step checks 455 whether the timer has expired or not. If in the step 455 it has been determined that the control piston has not yet reached the first end position, the process loops back to the step 450 for a further supply of the first fluid flow F1.

Each of the process steps as well as a subsequence of steps with regard to 4 can be controlled by means of a programmed computer apparatus. Moreover, although the embodiments of the invention described above with reference to the drawings comprise a computer apparatus and processes which are carried out in a computer apparatus, they likewise extend to computer programs, in particular computer programs on or in a carrier, which are executed. to realize the invention. The program may take the form of source code, machine code, code sub-source, and machine code, such as in a partially compiled form, or in any other form suitable for use in implementing the process of the invention. The carrier may be any item or device capable of receiving the program. For example, the carrier may comprise a storage medium such as a flash memory, a ROM (read-only memory) such as a CD (Compact Disc) or a semiconductor ROM, an EPROM (Erasable Programmable Read-Only Memory), an EEPROM (Electronic Erasable Programmable Read-Only Memory) Memory), or a magnetically recordable medium, for example a floppy disk or a hard disk. Further, the carrier may be a portable carrier, such as an electrical or optical signal, which may be communicated via an electrical or optical cable or by radio or other means. If the program is embodied by a signal that can be transmitted directly through a cable or other device or means, the carrier may be formed by such a cable or device or means. Alternatively, the carrier may be an integrated circuit in which the program is embedded, the integrated circuit being designed to perform the relevant processes or to benefit them for their execution.

The The invention is not limited to the described embodiments in the drawings limited, but can be varied freely within the scope of the claims.

Claims (17)

Transmission control system comprising: a transmission ( 320 ), which is designed to be mounted on a motor vehicle drive ( 325a . 325b ), wherein the transmission ( 320 ) a transmission actuating device ( 100 ), which is designed to at least one gear change operation with respect to the transmission ( 320 ), wherein the transmission actuating device ( 100 ) comprises: a cylinder body ( 105 ), which has a first inlet ( 110 ) and a second inlet ( 120 ), and a control piston ( 130 ) movable between a first end position ( 150 ) and a second end position ( 160 ) within the cylinder body ( 105 ) in response to a first fluid flow (F1) passing through the first inlet (F1) 110 ) or to a second fluid flow (F2), which via the second inlet (F2) 120 ) is supplied; and a transmission control unit ( 330 ), which is designed to operate the transmission actuating device ( 100 ) in response to at least one transmission control command, characterized in that the transmission control unit ( 330 ) is carried out to the transmission actuating device ( 100 ) such that when: the piston ( 130 ) in the first end position ( 150 ) and the at least one transmission control command indicates that the piston ( 130 ) to the second end position ( 160 ), the first fluid flow (F1) is caused to flow through the first inlet (15). 110 ), before the second fluid stream (F2) is caused to flow through the second inlet (14). 120 ) and then when the piston ( 130 ) in the second end position ( 150 ) and the at least one transmission control command indicates that the piston ( 130 ) to the first end position ( 160 ), the second fluid flow (F2) is caused to flow through the second inlet (14). 120 ), before the first fluid flow (F1) is caused to flow through the first inlet (15). 110 ) to be supplied. System according to claim 1, characterized in that the transmission control unit ( 330 ) is carried out to the transmission actuating device ( 100 ) in such a way that the supply of the first fluid flow (F1) is stopped at the latest (t ₁ , t ₁₁ ) when the supply of the second fluid flow (F2) is triggered (t ₁ ). System according to claim 2, characterized in that the transmission control unit ( 330 ) out is guided to the transmission actuating device ( 100 ) such that no fluid flow to the cylinder body ( 105 ) is supplied during a period (t ₁ -t ₁₁ ) before the supply of the second fluid flow (F2) is triggered. System according to claim 1, characterized in that the transmission control unit ( 330 ) is carried out to the transmission actuating device ( 100 ) in such a way that the supply of the second fluid flow (F2) is triggered before the supply of the first fluid flow (F1) is stopped (t ₂₁ ). System according to one of the preceding claims, characterized in that the transmission control unit ( 330 ) is carried out to the transmission actuating device ( 100 ) such that the first and second fluid streams (F1, F2) have substantially identical stationary magnitudes (f1, f2). System according to one of claims 1 to 4, characterized in that the transmission control unit ( 330 ) is carried out to the transmission actuating device ( 100 ) such that the first fluid flow (F1) has a steady-state order of magnitude (f1) greater than the stationary magnitude (f2) of the second fluid flow (F2). System according to one of claims 1 to 4, characterized in that the transmission control unit ( 330 ) is carried out to the transmission actuating device ( 100 ) such that the second fluid flow (F2) has a steady-state order (f2) which is greater than the steady-state order (f1) of the first fluid flow (F1). Motor vehicle ( 300 ), characterized in that it comprises a transmission control system according to one of claims 1 to 7. Method for controlling a transmission actuating device ( 100 ) of a transmission ( 320 ) in a motor vehicle, wherein the transmission actuating device ( 100 ) a cylinder body ( 105 ) and a control piston ( 130 ), which between a first end position ( 150 ) and a second end position ( 160 ) within the cylinder body ( 105 ) is movable in response to a first fluid flow (F1) that is directed to the cylinder body (F1). 105 ) via a first inlet ( 110 ), or to a second fluid flow (F2), which leads to the cylinder body ( 105 ) via a second inlet ( 120 ), characterized in that when the piston ( 130 ) in the first end position ( 150 ) and to the second end position ( 160 ), the method comprises: triggering a supply of the first fluid flow (F1) through the first inlet ( 110 ) before triggering a supply of the second fluid flow (F2) through the second inlet (F2) 120 ). A method according to claim 9, characterized by a cancellation (t ₁ , t ₁₁ ) of the supply of the first fluid flow (F1) at the latest when the supply of the second fluid flow (F2) is triggered (t ₁ ). A method according to claim 10, characterized in that by the method before triggering the supply of the second fluid flow (F2) has a period (t ₁ -t ₁₁ ), during which no fluid flow for the cylinder body ( 105 ) is supplied. A method according to claim 9, characterized by triggering (t ₁ ) the supply of the second fluid flow (F2) before a canceling (t ₂₁ ) of the supply of the first fluid flow (F1). Method according to one of claims 9 to 12, characterized the first and second fluid streams (F1, F2) are substantially identical Stationary orders of magnitude (f1, f2). Method according to one of claims 9 to 12, characterized the first fluid flow (F1) has a stationary magnitude (f1), which is larger as a steady-state orders of magnitude (f2) of the second fluid flow (F2). Method according to one of claims 9 to 12, characterized the second fluid flow (F2) has a stationary magnitude (f2), which is larger as a steady-state orders of magnitude (f1) of the first fluid flow (F1). Computer program that directly into the internal memory a computer can be loaded, which software to control the steps of one of the claims 9 to 15 when the program is running on the computer. Computer readable medium ( 335 ) having a program stored thereon, the program causing a computer to control the steps of any one of claims 9 to 15.