JPS6372958A - Electronically controlled speed change gear - Google Patents

Abstract

PURPOSE:To carry out smoothly gearshift operations by setting a judgment standard for each target gearshift position whether or not a gearshift operation may be performed to carry out a speed change operation. CONSTITUTION:A setting part 23 which enables gearshift operations in correspondence to the positions directed by a target gear position signal TG, and a discriminating part 24 which discriminates whether or not a set signal ST and the rotating speed conditions of input and output shafts 5a, 5b of a transmission 5 are under a prescribed condition are provided. Only when the rotating speed of the input shaft 5a of the transmission 5 and that of the output shaft 5b thereof are under a prescribed condition, a shift control signal SF is output. Thus, gearshift operations can be smoothly carried out.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an electronically controlled transmission.

(Prior art) In recent years, in order to automate the operation of a transmission equipped with a friction clutch and a parallel shaft gear type transmission,
An actuator is provided for each of the J-friction clutch and transmission,
Electronically controlled transmissions that can drive these actuators using control signals from a control section have been put into practical use. The gear type transmissions used in these various devices do not necessarily adopt a synchro mesh type transmission, and when using a gear type transmission without a synchro device, the gear type transmission is There is a problem in that it is difficult to carry out the insertion smoothly.

Therefore, conventionally, in this type of electronically controlled transmission using a transmission without a synchronizing device, in order to reduce the shock during gear shifting, the speed difference between the input shaft and output shaft of the transmission is The configuration is such that a gear shift operation is performed when the amount of time is within a predetermined range (for example, see Jitsuma Kai 60-133258).
.

(Problem to be solved by the invention) However, in the conventional configuration, the speed difference range between the input and output shafts of the transmission that allows gear shifting operation is set to a constant value, so when the gear is in a low gear, the shock at the time of shifting occurs. If the speed difference range is set so as not to occur, in the case of a high gear, the waiting time between disengaging the clutch and being able to shift the gear becomes longer, resulting in a lot of wasted time for gear shifting. It has the problem of being stored away.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide an electronically controlled transmission that can smoothly shift gears to all gear positions without wasting time for shifting.

(Means for Solving the Problems) The present invention for solving the above objects includes a clutch, a gear type transmission without a synchronizing device, and a target indicating a target gear shift position of the gear type transmission. An electronically controlled transmission comprising means for outputting a signal, and control means for electronically controlling operations of the clutch and the gear type transmission in response to the target signal, wherein an input shaft of the transmission is provided. a first means for detecting the actual value of the speed difference between the output shaft and the output shaft; and a second means for responding to the target signal and setting a range of the speed difference that allows a gear shifting operation in accordance with a target gear shift position.
means, and the speed change operation is executed only when the actual value of the speed difference is within the speed difference range set by the second means.

(Function) When the target signal is output, in response, the second means sets a speed difference range that allows a predetermined speed change operation for the target gear shift position at that time. This speed difference range indicates the range of the difference between the input shaft rotational speed and the output shaft rotational speed of the transmission that can perform gear shifting operations, and a relatively narrow speed range is given to low-speed gears. The higher the gear, the wider the speed range. The first means detects the actual value of the speed difference, and if the actual speed difference falls within the speed difference range set by the second means, a gearshift operation to the target gearshift position indicated by the target signal is permitted. , the required gear shift is smoothly carried out by the control means.

(Example) Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 shows an embodiment of an electronically controlled transmission according to the present invention. The electronically controlled transmission 1 is mounted on a vehicle (not shown) driven by an internal combustion engine 2, and is connected to a friction type clutch 4 provided between a wheel drive device 3 of the vehicle and the internal combustion engine 2, and a parallel shaft. It is equipped with a gear type transmission 5.

A clutch actuator 6 for connecting and disengaging the clutch 4 is connected to the friction type clutch 4, and a clutch signal CL indicating the position of the clutch plate 4a of the clutch 4 is connected to the clutch plate 4a. It is output from the clutch position sensor 7. On the other hand, a drive device 8 for performing a gear shift operation of the transmission a5 is connected to the transmission 5, and a gear position sensor 9 connected to the transmission 5 detects the gear shift position of the transmission 5 at any given time. A gear position signal GP is output.

The input shaft 5a of the transmission 5 connected to the clutch 4 is provided with a first detector 1 for detecting the rotational speed of the input shaft 5a.
0 is set. The first detector 10 is a known speed sensor consisting of a first balsa 11 fixed to the input shaft 5a and a first pickup coil 12 disposed opposite thereto. On the other hand, the output shaft 5b of the transmission 5 connected to the wheel drive device 3 is provided with a second detector 13 for detecting the rotational speed of the output shaft 5b. The second detector 13 is a known speed sensor consisting of a second pulser 14 fixed to the output shaft 5b and a second pick amplifier coil 15 disposed opposite the second pulser 14.

The first detection signal SA from the first pickup coil 12 is input to the first circuit 16, and the first detection signal SA from the first pickup coil 12 is input to the input shaft 5.
A first speed signal S whose level changes depending on the rotational speed of the motor a is output. On the other hand, the second pick amplifier coil 1
The second detection signal SB from 5 is input to the second circuit 17,
The second circuit 17 outputs a second speed signal S2 whose level changes depending on the rotational speed of the output shaft 5b.

The second speed signal S2 is input to the target gear position calculation unit 18 as a signal indicating the vehicle speed at that time. The target gear position calculation unit 18 also receives an accelerator signal A from an accelerator sensor 20 that detects the amount of operation of the accelerator pedal 19 and a select position SC that indicates the select position of the selector 21. Based on this, the optimum gear position at each moment is calculated, and a target gear position signal TG indicating the result is output.

The target gear position signal TG is input to the gear change control device 22 into which the clutch signal CL, the gear position signal GP, and the first and second speed signals Sl+82 are input, and is shifted to the gear shift position indicated by the target gear position signal TC. A shift control signal SF for shifting the gears of the transmission 5 is output from the gear change control device 22 and input to the drive device 8.

The electronically controlled transmission 1 according to the present invention has a rotational speed N& of an input shaft 5a of a transmission 5 and a rotational speed Nb of its output shaft 5b.
allows the shift control signal SF to be output from the gear change control device 22 only when and under predetermined conditions;
In order to thereby ensure that the gear shift operation is performed smoothly, the gear shift operation is enabled in accordance with the target gear shift position indicated by the target gear position signal TG.

and N, a setting signal ST indicating data regarding the speed range set in the setting portion 23, and first and second speed signals S, , S! It has a rotational speed state determination section 24 for determining whether or not the rotational speed state of the input and output shafts 5a, 5b of the transmission 5 is under a predetermined condition in response to the above.

In the illustrated embodiment, the setting unit 23 sets the lower limit value X of the speed of ■N, the lower limit value Y of the speed of ■N, and the lower limit value Y of the speed of ■I N, -Nb.
The upper limit Z1 of the value of l is set for each gear position, and the signal indicating the set value is the setting signal S.
It is output as T and input to the rotational speed state determination section 24.

Next, with reference to FIG. 2, the rotational speed state determination section 24 will be explained in detail.

The first speed signal S1 is the first speed signal to which the setting signal ST is input.
The input is input to the speed determination unit 31, where it is determined whether the rotational speed N of the input shaft 5a is greater than a predetermined speed The first output 01, which is rLJ, is output. On the other hand, the second
The speed signal S2 is input to the second speed determination section 32 to which the setting signal ST is input, and here, it is determined whether the rotational speed N of the output shaft 5b is greater than a predetermined speed Y.
When N, > Y, it becomes rHJ, and when N, ≦Y, it becomes r
A second output 0□, which is LJ, is output.

The first and second outputs 01,0□ are input to the OR gate 33.

The rotational speed N of the input shaft 5a, and the rotational speed N of the output shaft 5b,
The first and second speed signals S, in order to detect whether the difference between the first and second speed signals S,

S2 is input to the difference determining section 34 to which the setting signal ST is input, and it is determined here whether IN, -N, l≦Z. The difference determination unit 34
When Na-Nbl≦Z, the first side position signal, which is at the rHJ level, is output.

Reference numeral 35 indicates first and second speed signals S.
1. In response to St, it is determined whether the rotational speed Nb is greater than the rotational speed N, and if Nb > Nm, rHJ
This is a size discrimination unit that outputs a second side position number D2 which is the level.

First judgment side number D+ and output signal M from OR gate 33
1 is input to the AND gate 36.

The output signal M is a signal that becomes the "■ (" level) when at least one of the first or second output 0□o2 is at the rHJ level, and either of the conditions N, > X or N b > Y is satisfied. The level is "I" when the rotational speed difference between the input and output shafts 5a and 5b is less than or equal to the predetermined value Z, and either N m > X or Nb > Y is satisfied. Antgame if satisfied]・3
The level of the output signal M2 of No. 6 becomes rHJ. This output signal M2 is input to the gear change control device 22 as a signal for permitting a gear change to the desired gear position; 7 at that time.

The rotational speed state determination unit 24 further determines whether or not to perform a double clutch operation when both the input and output shafts 5a and 5b of the transmission 5 have a speed lower than the respective predetermined values X and Y. Double clutch discrimination circuit 3 for discrimination
It has 7. The double clutch discrimination circuit 37 includes an AND gate 38, an inverter 39, 40, and an OR gate 4.
Consisting of 1. A second discrimination code, ,D2, and an output signal, M, are input. Double clutch discrimination circuit 37
responds to these input signals, ■ If N, ≦X and 2N, ≦Y in the case of gear shift; ■ If N6>N and I N, in the case of gear shift;
-N, l≦Z, the level of the output signal M of the double clutch discrimination circuit 37 becomes rHJ in any of the following cases. The output signal M is input to the double clutch control circuit 25, and a double clutch signal WS is output (see FIG. 1).

Returning to FIG. 1, in addition to the shift control signal SF, the gear change control device 22 disengages the clutch 4 prior to gear shift operation, and upon completion of the gear shift operation, the gear change control device 22
In addition to outputting a clutch control signal CS for controlling the clutch 4 to reconnect the clutch 4, the engine control signal ES for controlling the speed of the internal combustion engine 2 to prevent the internal combustion engine 2 from revving up when the clutch 4 is disengaged is output. Output. The clutch control signal C8 is input to the clutch drive circuit 26 to which the double clutch signal WS is input, and outputs a clutch drive signal CS for driving the clutch actuator 6. On the other hand, the engine control signal ES is input to the engine control device 27 for controlling the speed of the internal combustion engine 2, and when the clutch 4 is in a disengaged state, the rotational speed of the internal combustion engine 2 reaches a predetermined rotational speed. The fuel supplied to the internal combustion engine 2 is controlled so that the internal combustion engine 2 is maintained.

According to such a configuration, the target gear position signal TG indicating the current target gear shift position calculated by the target gear position calculation unit 18 is input to the gear change control device 22 and simultaneously input to the setting unit 23. . Setting section 23
is responsive to the target gear position signal TG, and the range of speed difference between the input and output shafts that allows execution of the gear shifting operation and the lower limit speeds of the input and output shafts are set for each target gear position indicated by the target gear position signal TG. , data indicating the range of the set speed difference is given to the rotational speed state determination section 24.

In the rotational speed state determination unit 24, the input/output shaft 5a of the transmission 5
, 5b is within the speed difference range set as described above, and at least one of the input/output axes 5a, 5b is preliminarily connected to the respective axes 5a, 5b. A determination is made as to whether or not the motor is rotating at or above each predetermined lower limit rotational speed.

If the result of each determination is YES, the rotation speed state determination unit 2
The level of the output signal M2 outputted from 4 becomes rHJ, and execution of the gear change operation by the gear change control device 22 is permitted, and the required gear change is performed. A gear shift operation to the target gear shift position is executed by outputting a shift control signal SF, an engine control signal ES, and a clutch control signal C3 from the gear change control device 22 for performing the gear shift operation.

In this way, the gear change is performed only under predetermined conditions that allow the gear to be shifted smoothly, so the gear change can be performed smoothly and the life of the transmission can be significantly extended.

On the other hand, in a state where the above-mentioned conditions for gear shifting cannot be obtained, the output signal M3 is output, which activates the double clutch control circuit 25, executes a double clutch operation of the clutch 4, and controls the transmission 5. Input/output shafts 5a, 5b
, thereby achieving the aforementioned conditions for shifting into gear.

A control function similar to the speed change control function shown in the above embodiment can be realized by, for example, executing a predetermined control program by a microcomputer.

Is there a system for that purpose in Figure 3? A flowchart showing an example of an In program is shown, and this flowchart will be described below. The control program shown by this flowchart is a program for performing control to execute a required gear change when it is determined that a gear change operation must be executed in response to a target gear position signal TG. It is. After the program starts, the speed control of the internal combustion engine 2 is set to isochronous control mode in step 51, and the clutch 4 is turned off (step 52). After that, step 53
Then, the gear of the transmission 5 is removed to bring it into a neutral state, and then the gear position of the transmission 5 is positioned at a select position corresponding to the target gear shift position (step 54).

Next, in step 55, conditions for gear shifting are set according to the target gear shift position. The conditions set here are the X, Y, and Z values described above.

FIG. 4 shows step 5 for determining each of X, Y, and Z for each reverse position and each gear position of 1st to 6th gears.
5 is shown in detail. Describing the flowchart shown in FIG. 4, first step 7
1, it is determined whether the target gear shift position (hereinafter simply referred to as "target position") indicated by the target gear position signal TG is the reverse position. If the determination result is YES, step 72 , where X,
Each of Y and Z is set to XR, YR, and ZR. If the determination result in step 71 is No, the process proceeds to step 73, where it is determined whether or not the target position is the first speed position.If the determination result is YES, the process proceeds to step 74. Then, each of X, Y, and Z becomes Xi, Yl, and Z.
is set to l. If the determination result in step 730 is No, the process proceeds to step 75, where it is determined whether or not the target position is the second speed position, and if the determination result is Y.
If ES, proceed to step 76, where x, y, z
Each of them is X2. Y2. It is set to Z2. Step 75
If the determination result is NO, the process proceeds to step 77, where it is determined whether the target position is the third speed position, and if the determination result is YES, the process proceeds to step 78. Here, each of X, Y, and Z is X3. Y3. It is set to Z3. If the determination result in step 77 is NO,
The process advances to step 79, where it is determined whether or not the target position is the fourth speed position. If the determination result is YES, the process advances to step 80, where each of X, Y, and Z is X4. Y4. It is set to Z4. If the determination result in step 79 is No, proceed to step 81, where:
It is determined whether the target position is the fifth speed position,
If the determination result is YES, proceed to step 82;
Here, each of X, Y, and Z(7) is X5. Y5. It is set to Z5. If the determination result in step 81 is No, the process proceeds to step 83, where each of x, y, and z is determined to be X6.
Y6. It is set to Z6. Step 72°74.76.
After the execution of steps 78, 80, 82, and 83 is completed, the process proceeds to step 60.

Returning to FIG. 3, in step 60, it is determined whether N, > If the result of the determination is YES, the process proceeds to step 56, where a gear shifting operation is performed. That is, the rotational speed of the input shaft 5a is greater than X, and the input/output shaft 5
If the speed difference between a and 5b is smaller than Z, gearing to that non-synchronized gear position is executed.

If the determination result in step 61 is NO, step 62
Then, it is determined whether Na Nb>o or not, and N
If a>Nb, the determination result is YES, and the process proceeds to step 63, where it is again determined whether IN, -NJ<Z. In the case of I N, -Nbl≧Z, step 63 is repeatedly executed, and when the speed of the input shaft 5a decreases and l Na Nb l < Z, the determination result of step 63 becomes YES, and the process proceeds to step 56. move on. That is, I N,-Nbl≧Z, and N,>N
In the case of b, the process advances to step 56 after waiting for IN-ubl to become Z.

If the determination result in step 60 is No, step 6
Proceed to step 4, where it is determined whether Nb>Y or not, and N
If b>Y, the process advances to step 61. That is, N
! If either 1>X or Nb>Y, the process proceeds to step 61. The determination result in step 64 is NO.
In this case, the process proceeds to step 65, where a double clutch operation is executed and the rotational speed of the input shaft 5a is increased, and then the process proceeds to step 63. The same applies when the determination result in step 62 is No.

(Effects of the Invention) According to the present invention, as described above, when a gear is shifted in an electronically controlled transmission, it is determined whether or not the gear shifting operation may be performed for each target gear shift position. Since a standard is set and gear shifting is executed according to the judgment criteria suitable for each gear shift position, gear shifting is performed smoothly even in electronically controlled transmissions using gear type transmissions without synchronizers. Therefore, it is possible to effectively prevent excessive force from being applied to each part of the gear transmission, extending the life of the device, and also eliminating unpleasant noises when shifting gears. This can be prevented from occurring.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the electronically controlled transmission according to the present invention, FIG. 2 is a detailed block diagram of the rotational speed state determination section shown in FIG. 1, and FIG. 3 is the same as shown in FIG. 1. Is it similar to the control function of a circuit? Flowchart showing an example of a control program for realizing the '[l1 function using a microcomputer. FIG. 4 is a detailed flowchart of a portion of the flowchart shown in FIG. 3.

Claims (1)

[Claims] 1. a clutch, a gear transmission not equipped with a synchronizer, means for outputting a target signal indicating a target gear shift position of the gear transmission, and operation of the clutch and the gear transmission responsive to the target signal. In an electronically controlled transmission having a control means for electronically controlling the
a first means for detecting an actual value of a speed difference between an input shaft and an output shaft of the transmission; and responsive to the target signal, setting a range of the speed difference that allows a gear shift operation according to a target gear shift position. and a second means for determining the speed difference, and the speed change operation is performed only when the actual value of the speed difference is within the speed difference range set by the second means. type transmission.