JPH0535305B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a control device for an automatic transmission. Conventionally, in automobiles equipped with electronically controlled automatic transmissions, shift patterns have been set to D, 2, L range, or
There were some that were switched using an OD switch, power switch, economy switch, etc., and others that were switched depending on driving conditions, but all of these switches were made in multiple stages, and it was not possible to obtain an arbitrary intermediate pattern. The present invention has been made in view of the above-mentioned circumstances, and is designed to enable the shift pattern in an electronically controlled automatic transmission to be changed in multiple steps or in a stepless manner so that an arbitrary pattern can be obtained according to the driver's request. The purpose is to The gist of the present invention to achieve the above object is to detect the vehicle driving condition including at least the vehicle speed and engine load, and to compare the detected driving condition with a preset shift pattern to select a plurality of shift patterns according to the driving condition. A control device for an automatic transmission that determines one gear from among the gears includes a manual switching means for selectively switching between forward travel and reverse travel of the automatic transmission, and a manual switching means that issues a continuously changing signal. The shift control switch divides the change range of the above signal into a plurality of regions at the division points corresponding to each gear stage, and uses the signal changing within the same region to change the range of changes between the gear stages corresponding to the division points at both ends of the region. A control device for an automatic transmission characterized by comprising: means for continuously changing only a shift pattern related to speed change; DESCRIPTION OF THE PREFERRED EMBODIMENTS A control device for an automatic transmission according to the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an example of a hydraulic control system for an electronically controlled automatic transmission to which the present invention is applied. This hydraulic control device is related to an automatic transmission with four forward speeds and one reverse speed, and the output of an engine (not shown) is transmitted through a torque converter 11 or a direct coupling clutch 12 having a predetermined slip ratio to achieve four forward speeds and one reverse speed. The signal is transmitted to a transmission gear train (not shown). The front clutch 13, rear clutch 14, 4-speed clutch 15, kick-down brake 16, and low reverse brake 17 incorporated in the transmission gear train are each friction engagement devices, and the hydraulic pressure for operating them is supplied from an oil pump 18. obtain. Then, the respective frictional engagement devices 13 to 17 are selectively engaged in accordance with the driving state of the vehicle detected by a select lever on the driver's seat (not shown) and various driving state detection devices, and various gears are set. achieved automatically. The hydraulic control system shown in FIG. In order to operate each hydraulic piston (not shown) of the reverse brake 17 and 4-speed clutch 15, the hydraulic pressure supplied to each hydraulic chamber is controlled according to the operating state, and the pressure regulating valve 21, torque converter control valve 22, Direct coupling clutch control valve 23, pressure reducing valve 24, shift control valve 25, manual valve 26, 1st-2nd speed shift valve 27, 2nd-3rd speed, 4th-3rd speed shift valve 28,
The N-D control valve 29, the 4-speed clutch control valve 30, the oil pressure adjustment valve 31 for shifting, the N-R control valve 32, and the rear clutch control valve 33 are connected to each other via oil passages. Also, computer (electronic control device)
Two solenoid valves 35 and 36, which are closed when not energized and whose opening and closing are controlled by electric signals from 34, are attached to the direct coupling clutch control valve 23 and the oil pressure regulating valve 31.
Also attached to the shift control valve 25 are two solenoid valves A and B, which are closed when energized and whose opening and closing are controlled by the computer 34 . By the way, the shift lever that operates the manual valve 26 is usually P (parking), R (reverse), N
Six positions are defined: (neutral), D (drive), 2, and L, but only four positions, P, R, N, and F (forward), are defined in the shift lever according to the present invention. In other words, as you can see from these ranges, this shift lever is a stop-only lever that is operated mainly when stopping.
On the other hand, a control switch 51 as shown in FIG. 2 is provided near the handle. This control switch 51 has division points D ₄ , D ₃ ,
2. The position of L is determined, and by operating the control switch 51, the range between _D4 and L can be selected steplessly or in multiple finely divided steps, and is operated only when driving. It can be said to be a lever exclusively for driving. The functions of the L and _D4 ranges at both ends are the same as the L range and _D4 range in conventional automatic transmissions, and are called, for example, Sporty (S) and Economy (E), respectively. This control switch 51 inputs a signal (for example, voltage) corresponding to its position to the computer 34 in FIG. 1 as information. That is, as shown in FIG. 3, the shift pattern conversion signal from the control switch 51 is inputted to the computer 34 along with the vehicle speed and throttle opening, calculations are performed based on these, and control signals are sent to the solenoid valves A and B. is output. Solenoid valve A, B
For example, the speed change pattern depending on ON/OFF is as shown in the table below.

[Table] When driving, the shift lever that operates the manual valve 26 is in the F position, and the control switch 51 is in the F position.
The position of is arbitrarily selected between L and _D4 . When the control switch 51 is, for example, between _D3 and _D4 , the shift pattern when changing from 3rd speed to 4th speed is continuously shifted to the high speed side as it goes to the (S) side. In other words, the shift point from 3rd gear to 4th gear for a certain throttle opening is performed at a higher vehicle speed than the normal vehicle speed.
This allows the vehicle to travel at a speed one step lower than the speed at which the vehicle shifts to 4th gear. Similarly, when the control switch 51 is between 2 and D3, the shift pattern for 2nd and _3rd speeds shifts to the high speed side, and when it is between L and 2, the shift pattern for 1st and 2nd speeds shifts to the high speed side. For example, when it is between 2-D ₃ , as shown in Figure 4,
The normal shift pattern shown by the thick solid line a in the figure shifts to the side where the vehicle speed is higher, as shown by the many thin solid lines b in the figure. c in the figure indicates the limit speed. The above control is performed both during upshift and downshift. Next, shift pattern switching control according to the present invention will be explained based on the flowchart of FIG. When the program start process (1) is performed, the reference shift pattern data reading process (2)
Then, a comparison and judgment process (3) with the voltage (voltage corresponding to the set vehicle speed) V, which is a signal from the control switch 51, is performed. First, a comparison judgment is made between the input voltage v and the voltage (voltage corresponding to the vehicle speed pattern) _v4 when the control switch 51 is in _D4 , and if this is not smaller than the voltage _v4 , that is, if the comparison judgment result is NO. shows that the control switch 51 is in the _D4 position, and the solenoid valves A and B are controlled to perform the same shift control as before in the normal _D4 range state ((4) in the figure). ). Comparison judgment result is YES
In this case, that is, when the input voltage v ₄ v is smaller than the voltage, the 3-4 shift vehicle speed calculation process (5) is performed. 3-4 Vehicle speed is determined by the following formula. (3-4 vehicle speed) = (reference vehicle speed) + (v ₄ - v) × R where R: constant Next, a comparison judgment process (6) is performed between the calculation result and the limit speed V ₄ at the time of upshifting,
If the speed is greater than the limit speed, then the comparative judgment result is
If NO, it is not preferable to maintain it above that, so process to set 3-4 vehicle speed to V ₄ (7)
Do this. Similarly, when downshifting to 4-3 speed, a comparison judgment process (8) with the limit speed V4' is performed, and if the calculation result is greater than the limit speed _V4 ' (in the case of NO), the 4-3 speed is compared with the limit speed V4'. A process (9) is performed in which the third vehicle speed is set to V ₄ '. In cases other than the above, the operation result is V ₄ (or V ₄ ′)
If it is smaller (in the case of YES), a comparison judgment process (10) is performed between the calculation result and the voltage when the control switch 51 is in _D3 (voltage corresponding to the set vehicle speed) _v3 , and the voltage is lower than _v3 . If it is larger (NO), the control switch 51
It means between D ₃ - D ₄ , depending on the voltage 3
- Solenoid valves A and B are controlled (11) to shift the shift pattern of the 4th speed shift to the high speed side. If the comparison judgment result is YES, calculation processing is performed for the 2-3 shift as well as the 1-2 shift in the same way as for the 3-4 shift, and control is performed to shift the shift point to the high speed side in each region. will be done. As mentioned above, by operating the control switch 51, it is possible to arbitrarily set a shift pattern different from the standard. In addition, for normal operation, that is, when there is no need to change the shift pattern as described above, the control switch 51 is turned off.
Just keep it on the (E) side. In the above embodiment, the shift pattern conversion switch is a rotary type, but it may be a linear type that allows the position to be selected linearly. Also, the ranges to be set are L, 2, D ₃ ,
It is not limited to D ₄ , but can be changed in various ways depending on the number of gears.
Further, in the above embodiment, two solenoid valves are used to operate the shift control valve 25, but it is of course possible to use one solenoid valve. As described above in detail using one embodiment, according to the automatic transmission control device according to the present invention, a shift pattern can be continuously obtained according to the driver's preference. The structure that implements this method is that the stop-only lever and the drive-only lever are functionally separated, so there is no risk of erroneously operating the shift position as in conventional automatic cars, and the drive-only lever is If it is installed near the handle, it will be easier to operate and check.

[Brief explanation of the drawing]

Fig. 1 is a hydraulic system diagram of an example of a hydraulic control device for an automatic transmission to which the present invention is applied, Fig. 2 is a plan view of a control switch, Fig. 3 is a block diagram showing an outline of the control according to the present invention, and Fig. 4 The figure shows a map of an example of the 2nd-3rd speed shift pattern, and FIG. 5 is a flowchart showing the control process. In the drawing, 25 is a shift control valve, 26 is a manual valve,
34 is a computer, 51 is a control switch, and A and B are solenoid valves.

Claims (1)

[Scope of Claims] 1. Detect vehicle operating conditions including at least vehicle speed and engine load, compare the detected operating conditions with a preset shift pattern, and shift from a plurality of gears according to the operating conditions. A control device for an automatic transmission that determines two gears, comprising: a manual switching means for selectively switching the automatic transmission between forward travel and reverse travel; and a manual shift control switch that issues a continuously changing signal. , The change range of the above signal is divided into a plurality of regions at division points corresponding to each gear stage, and the signal changing within the same region is used to create a shift pattern for shifting between the gear stages corresponding to the division points at both ends of the region. 1. A control device for an automatic transmission, comprising: a means for continuously changing only the transmission speed; and a control device for an automatic transmission.