JPS62196442A - Rotation control method for automatic transmission controller - Google Patents

Abstract

PURPOSE:To enable highly accurate control by measuring the periods of pulse signals proportional to the rotation of the output shaft of transmission, then smoothing the periods while furthermore smoothing the reciprocal of said smoothed data or the rotation data and employing as a car speed data. CONSTITUTION:The ratio of the rotation between the input and output shafts of a transmission 2 is determined by a gear ratio which is modified during speed change by driving a select actuator 4 and a shift actuator 5 through a control circuit 8. Here, the periods of the pulse signals proportional to a rotation signal 16a detected through an electromagnetic pickup 16 are measured and temporarily smoothed. The reciprocals of said smoothed data is employed as a rotation data which is stored with relatively long period then further smoothed and employed as a car speed data. Said car speed data is used for the travel control including the speed change.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic transmission that automates a mechanical transmission of a vehicle, and particularly to an automatic transmission control device that substitutes a rotational speed signal for a vehicle speed signal.

[Conventional technology]

Conventionally, the transmission described in JP-A No. 57-204359 (hereinafter referred to as T
/M), since the signal from the vehicle speed sensor is directly used as vehicle speed data, the torsional vibration of the drive system during gear setting is directly superimposed on the vehicle speed data. In order to avoid this, it is necessary to insert a filter with a large time constant to smooth out this vibration, but in this case, it is impossible to keep up with the rotational changes of the gear pair, as when changing gears. , it is not possible to perform a good gear shift.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, since the signal from the vehicle speed sensor is directly used as vehicle speed data, the torsional vibration of the drive system during gear setting is directly superimposed on the vehicle speed data.

In order to avoid this, it is necessary to use a filter with a large time constant to smooth out this vibration, but in this case, it is necessary to use a filter that has a large time constant to smooth out this vibration, but in this case, it is necessary to use a filter that has a large time constant to smooth out the vibration. This makes it impossible to perform a good gear shift.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to achieve both fast-responsive measurement during gear shifting and smooth measurement that absorbs vibrations after gear shifting, that is, after gear setting.

[Means for solving problems]

The above purpose is to measure the period of a pulse signal that is proportional to the rotation speed of the output shaft of the T/M, once smooth the period, find the effect of that value, and have a time constant that corresponds to the rotation speed. While performing measurements with quick response, this measured value is sampled at slow intervals, and the sampled data is averaged to create smoothed vehicle speed data, and when changing gears, data with quick response is obtained. This is achieved by using smoothed data after shifting.

[Effect]

By smoothing the pulse period and finding the reciprocal of this,
By applying a filter with a time constant that corresponds to the rotational speed, it is possible to measure rotations according to the actual rotational speed, and by applying this data again to a filter with a very large time constant, torsional vibration components can be smoothed out. I can do it.

In addition, by using this properly during gear shifting and after gear shifting, it is possible to perform rotation measurement according to the driving state.

〔Example〕

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

Engine 1. The power obtained is changed in speed by the transmission 2, accelerates and decelerates the vehicle, and obtains arbitrary power.

The transmission (hereinafter referred to as T/M) 2 has a constant mesh gear transmission, and the rotational speed ratio of the input shaft and output shaft of the T/M is determined by the gear ratio.
By driving the select actuator 4 and shift actuator 5, a gear pair with an arbitrary gear ratio is selected.

In addition, there is no synchronization mechanism in the T/M, and instead there is a coaxial number signal 15 that measures the rotational speed of the input shaft with electromagnetic pickups 1 and 5a, and a rotational speed signal that measures the rotational speed of the output shaft with an electromagnetic pickup 16a. The control circuit 8 which inputs the numerical signal 16 determines the gear ratio to be changed. With the gear pair completely synchronized, each actuator 4, 5 is actuated to set the gear.

Therefore, in a shift change, the control circuit first operates the shift actuator 5, puts the T/M in the neutral state, controls the governor opening of the injection pump, changes the engine speed, and engages the clutch 3. The input shaft rotational speed signal 15, that is, the engine rotational speed when
The value obtained by dividing the rotation speed of the output shaft by the gear ratio (here,
(referred to as synchro rotation speed), synchronize the rotations, and set the gears.

In this way, at the time of shifting, it is necessary to measure the rotational speed of the input shaft and output shaft extremely quickly and with high accuracy (about 1 rpm).

In this embodiment, the period t1 of the pulse signal as shown in FIG.
．． t21 t3T t;4 (latest data t□) is measured and represented by a typical filter shown by the following formula to determine the rotation speed N.

T = -(2T1+T2+T,) ...(
1)・Here, Z is the number of teeth. Here, the actual rotational speed of the input shaft and output shaft is No.
) Comparison with the measured value N calculated using the equation (2) shows that the time constant in the low speed range is large and the time constant in the high speed range can be kept small, as shown in Figure 3. In other words, the time constant is nonlinear. By using this property, it is possible to set the time constant according to practical conditions.

During gear shifting, rotation synchronization is performed based on such rotation speed data, but when gear shifting is completed, as shown in Figure 4, torsional vibrations due to shift shock appear, and the output shaft rotation speed, which should originally match, appears. This will indicate a value different from the actual vehicle speed. Therefore, when the shift schedule is determined only by the vehicle speed value as shown in FIG. 5, when the rotational speed fluctuates more than the hysteresis width, the shift schedule does not follow the regular shift schedule.

In order to avoid this, the time constant of the previous filter can be made very large, but since a quick response is required when changing gears, the filter time constants for changing gears and after shifting are separated. It is necessary to keep it.

In this example, as shown in Fig. 6, 1.0 m5ec
The rotational speed is measured in a control cycle of about 1000m, and this is taken as the rotational speed signal value during gear shifting. This is sampled every several hundred m5ec, and this is also smoothed using the representative filter shown below. Then, N= -(N1+N2+N, +N,) -(3
) As shown in FIG. 6, the vibration component of the rotational speed can be removed. By substituting the rotational speed measurement value N for the vehicle speed signal after shifting, it is possible to avoid disturbances in vehicle speed data due to torsional vibration of the drive system caused by fluctuations in engine load. In addition, since the actual vehicle speed itself does not change suddenly,
Even if a filter with a large time constant is used, there will not be a difference between the vehicle speed data and the actual vehicle speed that is large enough to cause discomfort when driving.

Therefore, when using it for shift schedules, etc., the actual vehicle speed is required, and when synchronizing the rotation of a gear pair, such as when changing gears, it is necessary to measure the actual rotation speed. Previous measurement data N and W become useful.

〔Effect of the invention〕

According to the present invention, it is possible to quickly measure the change in rotational speed during gear shifting, and smooth the rotational speed with a large time constant based on this rotational speed.
Because it is possible to obtain vehicle speed data commensurate with the actual vehicle speed,
It is possible to create data that matches the shift schedule and during gear changes, which is effective in enabling smooth driving.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention. 3, 4, and 6 are time charts, and FIG. 5 is an explanatory diagram of the embodiment. 1...Engine, 2...Transmission, 3.
...Latch, 4...Select actuator, 5.
...Shift actuator, 6...Accelerator pedal,
7... Injection governor, 8... Control circuit, 9... Shift tower, 15... Input shaft rotation signal, 16... Output shaft rotation signal. c+ -1-sheets V'n'no- Yu7 figure time time slow nftos soyuru

Claims (1)

[Claims] 1. The speed change operation of the vehicle transmission is performed by an active element (for example, a hydraulic cylinder) driven by a control circuit, and the rotational speeds of the input shaft and output shaft of the transmission are input to the control circuit, and the rotation speed of the input shaft and output shaft of the transmission is inputted to the control circuit. In the speed change control device that drives the active element when the ratio of the number of rotations is made equal to the gear ratio, It is measured, memorized, and smoothed, and the reciprocal of this smoothed data is taken as rotation speed data. During the gear shifting process of the transmission, the rotation speed data is used as the rotation speed of the output shaft, and the rotation speed data is made relatively long. A rotation speed processing method for an automatic transmission control device, characterized in that the rotation speed data is memorized in cycles, further smoothed, and used as vehicle speed data.