JPS6014646A - Speed-change controller for automatic speed change gear for car - Google Patents

Abstract

PURPOSE:To permit speed change gear to be selected without generating hunting by allowing the detection signal of a throttle sensor to be provided with hysteresis by the software of a computer for controlling the speed change operation of an automatic speed change gear. CONSTITUTION:A throttle sencor 1 is connected to the computer 44 in a control circuit 4 which controls the speed change operation of an automatic speed change gear 5, through an A-D converter 42. The detection signal of the throttle sensor 1 is provided with hysteresis by the software of the computer 44. Therefore, a throttle sensor whose detection signal is not provided with hysteresis can be adopted. Thus, speed change gear can be selected without generating hunting.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shift control device for a vehicle automatic transmission using a computer.

In this type of shift control device, a shift pattern that determines the shift gear to be selected based on the relationship between the throttle opening and vehicle speed is stored in a memory, and the throttle opening and vehicle speed are detected for this shift pattern. is applied to control the transmission so that the gear that matches the transmission pattern is selected.

In addition, the above-mentioned shift pattern is determined by distinguishing between a shift amplifier pattern for switching from a low speed side to a high speed side gear, and a shift down pattern for switching from a high speed side to a low speed side gear, and a shift pattern for changing from a high speed side to a low speed side gear. Hysteresis is provided between the two, and the throttle sensor itself that detects the throttle opening also has a hysteresis characteristic. Throttle sensor hysteresis occurs when the throttle sensor is affected by vehicle body vibration.
This is to prevent subtle fluctuations in the detected value.

By providing hysteresis in the shift pattern and the detection signal of the throttle sensor in this manner, the selection of the shift gear can be performed stably.

However, the detection signal of the throttle sensor.

In addition to being used for speed change control as described above, it is also used for engine control.

Since accurate detection of the throttle opening is required, it is not preferable for the detection signal of the throttle sensor to have hysteresis.

Therefore, if a throttle sensor whose detection signal does not have hysteresis is used, the throttle opening degree can be accurately detected, which is suitable for engine control.

In shift control of automatic transmissions, subtle fluctuations in detection signals cause a hunting phenomenon in which upshifts and downshifts are frequently repeated where upshift patterns and downshift patterns overlap.

In view of these conventional problems, an object of the present invention is to provide hysteresis to the detection signal of the throttle sensor using computer software that controls the speed change control of an automatic transmission, so that the throttle sensor itself has hysteresis characteristics. The purpose is to enable stable selection control of transmission gears without having to have a transmission gear.

The structure of the present invention for achieving this object will be explained with reference to FIG.

The shift pattern storage means defines the shift gear to be selected depending on the relationship between the throttle opening degree and the vehicle speed, and also includes a shift up pattern for switching from a low speed side to a high speed side gear, and a shift up pattern for switching from a high speed side to a low speed side gear. The downshift pattern to be changed is stored separately.

Further, the speed change gear storage means detects the actual speed change gear,
I remember.

On the other hand, the throttle opening degree is detected by the throttle opening degree detection means, and a predetermined value is added to this throttle opening degree by the addition means.

Then, the shift pattern succession means calculates the actual shift gear from the actual shift gear stored by the shift gear storage means, the shift pattern stored by the shift pattern storage means, and the throttle opening obtained by the addition means. Reads either the gear shift up pattern or the gear down shift pattern, and detects the actual shift gear stored by the shift gear storage means, the shift pattern stored by the shift pattern storage means, and the throttle opening detection means. The other of the actual shift gear upshift pattern or downshift pattern is read from the throttle opening degree.

The shift command means compares the upshift pattern and the downshift pattern read by the shift pattern successive means with the vehicle speed detected by the vehicle speed detection means, and when the vehicle speed is greater than the vehicle speed of the shift up pattern, shifts up. A command signal is generated, and when the vehicle speed is smaller than the vehicle speed of the downshift pattern, a downshift command signal is generated.

According to the present invention, a predetermined value is added to the throttle opening by the adding means, and either the shift-up pattern or the shift-down pattern is read out at the throttle opening to which the predetermined value has been added.

The reading of the other shift-up pattern or shift-down pattern is performed using the throttle opening itself without adding a predetermined value, so even if the shift-up pattern and shift-down pattern Σ overlap, a throttle sensor without hysteresis characteristics can be used. This allows the transmission gear to be selected without causing hunting. Furthermore, by using a throttle sensor without hysteresis characteristics, engine control can be performed optimally.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of one embodiment.

A control circuit 4 including a computer 44 includes a throttle sensor 1 that detects the opening of a throttle valve (not shown) and an output shaft (not shown) of an automatic transmission 5 that corresponds to the vehicle speed.
Solenoids 51 and 52 are provided in the automatic transmission 5 and operate solenoid valves (not shown) by inputting detection signals from the reed switches 2 and 3 that detect the rotation speed of the automatic transmission 5, respectively.
．． An operation signal is output to 53.

The throttle sensor 1 consists of a so-called potentimeter, is configured so that its detection signal does not have hysteresis characteristics, and generates an analog voltage that is approximately proportional to the throttle valve opening. The throttle sensor l is supplied with a constant voltage from a constant voltage detour Ni 41 in the control circuit 4, and inputs a detection signal to the computer 44 via an A-D converter 42 also in the control circuit 4. There is.

The reed switch 2.3 is located one in the speedometer (not shown) and the other in the automatic transmission 5, and sends a vehicle speed signal to the computer 44 via an input buffer 743 in the control circuit 4. It is supposed to be entered. The reason why two similar reed switches are provided is that the vehicle speed is normally detected from the signal of the reed switch in the automatic transmission 5, and when the signal is no longer sent from this reed switch due to some kind of failure, the vehicle speed is detected by the meter. This is to detect vehicle speed from the signal from the reed switch located at

Each solenoid 51, 52, 53 receives an operating signal from the computer 44 via an output buffer 45 in the control circuit 4, and determines the state of the operating signal to the solenoid 51, 52,
In other words, the automatic transmission 5 is configured to be able to select one of the gears from 1st to 4th gears by selecting four combinations of energization and de-energization of the solenoids 51 and 52. Furthermore, whether or not lock-up occurs in the automatic transmission 5 is selected by energizing or de-energizing the solenoid 53.

Furthermore, a shift pattern as shown in FIG. 3 is stored in the memory in the computer 44.

This shift pattern is the same as that of a commonly used automatic transmission, and the vertical axis is the throttle opening, and the horizontal axis is the output shaft rotation speed of the automatic transmission, which corresponds to the vehicle speed, as shown by the solid line. Shift up (turn) to change from a low speed gear to a high speed gear.

As shown by the broken line, a downshift pattern for switching from a high-speed gear to a low-speed gear is distinguished. Therefore, hysteresis is provided between upshifting and downshifting. However, the throttle opening is 85%
At nearby kickdown opening degrees, the upshift pattern and downshift turn overlap each other, and no hysteresis is provided.

The computer 44 applies the throttle opening degree and vehicle speed detected by the slot, the sensor l, and the reed switch 2.3 to the above-mentioned shift pattern, and instructs the solenoid to select the shift gear as defined in the shift pattern. The operating signal is output at 51° and 52. Also,
A lock amplifier pattern similar to the shift pattern is also stored in the memory of the computer 44, and an operation signal is output to the solenoid 53 so that lock-up is performed according to this lock-up pattern.

Such operations of the computer 44 are achieved by executing a program previously stored in the memory, and the transmission gear selection routine of this program is as shown in the flowchart of FIG. 4, and this flowchart will be explained below.

First, in step 61, the desired transmission gear N is set to 4th speed. In step 62, it is determined whether the actually selected transmission gear SHM is the same as N. Now, if the actual transmission gear SHM is 4th speed.

If step 62 is affirmative, the process proceeds to step 76, where a predetermined value of 1 θh is added to the throttle opening O1 detected by the throttle sensor 1, and this is set as a new throttle opening θt. Next step 7
7, from the requested throttle opening θt and N, the third
The shift point Vt of the 4-→3 shift down pattern in the shift pattern shown in the figure is read out.

Then, in step 78, the read shift point Vt is compared with the vehicle speed SPD detected by the reed switch 2.3, and if the vehicle speed SPD is currently greater than the shift point Vt, there is no need to downshift. Therefore, an affirmative determination is made in step 78, and the processing of one routine is completed. Thereafter, a shift command routine (not shown) is performed so that the fourth gear is selected, and a predetermined operating signal is output to the solenoids 51 and 52. Further, when the vehicle speed SPD is smaller than the shift point Vt, it is necessary to downshift, so a negative determination is made in step 78, and step 7
9, the transmission gear N that should be here is downshifted from 4th gear to 3rd gear.

During the process of step 62, if the actual speed change gear Sz (M) is 3rd speed, a negative determination is made in step 62 and the process proceeds to step 63, where the throttle sensor 1
The shift point Vt of the 3→4 shift amplifier pattern in the shift pattern of FIG. 3 is read from the throttle opening θt detected by and the desired shift gear N. Then, in step 64, the read shift point Vt and the reed switch 2
．． 3, and if the vehicle speed SPD is greater than the current shift point V, it is necessary to shift up, so an affirmative decision is made in step 64 and the processing of this routine ends. . Therefore, after this, processing is performed so that the fourth gear is selected in the shift command routine. Further, when the vehicle speed SPD is smaller than the shift point Vt, there is no need to perform shift amplification, so a negative determination is made in step 64 and the process proceeds to step 65, where the shift gear N that should be here is changed from 4th gear to 3rd gear. . Step 6
In step 6, it is determined whether the actual transmission gear Si (M) is the same as N, and if both are currently the 3rd gear and the same.

If step 66 is answered in the affirmative, the process proceeds to step 67. In step 67, as in step 76, a new throttle opening θt is determined by adding a predetermined value of 10h to the throttle opening θt detected by the throttle sensor 1. Then, in step 80, the shift point Vt of the 3-+2 downshift pattern is read out in the same manner as in step 77, and in step 81, the shift point Vt and the vehicle speed S are read out.
Compare with PD. Thereafter, the processing of steps 81 and 82 is as follows.
Steps 77 and 78 are carried out in the same manner as steps 77 and 78, except that the value of the transmission gear N to be set is different, and steps 83 and 84 are also similar to these steps. Further, the processing of steps 82 and 85 is the same as that of step 79 and steps 68, 69 and 7.
The process of step 3.74 is the same as that of step 63.64, the process of steps 70 and 75 is the same as that of step 65,
The processing in step 71 is similar to that in steps 62 and 66, and the processing in step 72 is similar to that in steps 76 and 67, respectively.

In this way, when reading the shift point Vt of the shift up pattern in steps 63, 68 and 73, the throttle opening θtlt detected by the throttle sensor l is used as is, whereas in steps 77, 80 and 83 when reading the shift point Vt lt of the downshift pattern, step 76.6
7 and 72 are processed using the value obtained by adding a predetermined value -θh to the throttle opening θt, so even if the shift up pattern and downshift pattern overlap, such as during kickdown, subtle changes in the throttle opening θt will be processed. There is no need to repeat upshifts and downshifts due to fluctuations.

In the following embodiments, the memory of the computer 44 that stores the shift pattern shown in FIG. 3 corresponds to the shift pattern storage means of the present invention, and the actual shift gear SHM is similarly computer that remembers 4
4 memory is a gear storage means, and a throttle sensor l.
is the throttle opening inspection sensor, reed switches 2 and 3
A known program that uses the signals from the reed switches 2 and 3 as vehicle speed signals is used as the vehicle speed detection means, and the processing of steps 76, 67 and 72 in FIG. 4 is used as the addition means.

Steps 77.8'0 and 83. of FIG. Steps 63, 68, and 73 are used as the gear change pattern successive means, and steps 64, 65, 69, 70, . . . in FIG.
74, 75, 78, 79, 81, 82, and 84° 85 correspond to shift command means, respectively.

Although four specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and includes various embodiments within the scope of the claims. For example, the number of gears selected in the automatic transmission may be two or three, or five or more. The present invention is also applicable to automatic transmissions that do not have a lock-up mechanism.

[Brief explanation of drawings]

FIG. 1 is a diagram corresponding to claims, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a diagram showing an example of a shift pattern, and FIG. 4 is a diagram of the computer shown in FIG. 3 is a flowchart showing part of a program. ■...Tune throttle sensor 2.3...Reed switch 4...Control circuit 41...Constant voltage circuit 42...A-D converter 43. ... Input buffer 44 ... Computer 45 ... Output buffer 5 ... Automatic transmission 51.52.53 - Hitting solenoid Applicant Toyota Motor Corporation Fig. 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) A shift-up pattern that determines the gear to be selected based on the relationship between throttle opening and vehicle speed, and that switches from a low-speed gear to a high-speed gear, and a downshift pattern that switches from a high-speed gear to a low-speed gear. A predetermined value is added to the throttle opening detected by the speed change pattern storage means which stores the shift pattern separately from the above, the throttle opening detection means which detects the throttle opening, the vehicle speed detection means which detects the vehicle speed, and the throttle opening detection means which detects the vehicle speed. A change gear storage means that detects and stores an actual speed change gear, an actual speed change gear stored by the speed change gear storage means, a speed change pattern stored by the speed change pattern storage means, and a change gear storage means that detects and stores the actual speed change gear; From the obtained no-throttle opening degree, one of the actual shift gear upshift pattern or shift down pattern is read out, and the actual shift gear stored in the shift gear storage means and the shift pattern stored in the shift pattern storage means are read out. The shift pattern successive means reads the other of the actual shift gear upshift pattern or downshift pattern from the shift pattern detected by the throttle opening detection means and the throttle opening detected by the throttle opening detection means. The shift-up pattern and the shift-down pattern are compared with the vehicle speed detected by the vehicle speed detection means, and if the vehicle speed is higher than the vehicle speed of the shift-up pattern, a shift-up command signal is generated. When the vehicle speed is lower than the vehicle speed of the downshift pattern,
A shift control device for an automatic transmission for a vehicle, comprising a shift command means for generating a shift down command signal.