JPS59200844A - Controller for automatic speed change gear for vehicle - Google Patents

Abstract

PURPOSE:To lessen shocks encountered at the time of switching by a method in which when a change gear is switched to drive range, it is switched to a speed- changing step of small drive torque when the revolving number of engine is above a given revolving number. CONSTITUTION:A throttle opening sensor 1 and a vehicular speed sensor 2 are connected to a speed changing ratio determining circuit 3. The output signal circuit 5 of the circuit 3, an accel pedal switch 12, and an idle rotation control circuit 9 are connected to a speed changing ratio control circuit 14. When idle- over signal 11 and accel pedal releasing signal 13 are sent out concurrently, an output signal circuit 5 is shut down, the solenoid valve 7 is made inoperative, and switching is made to speed-changing ratios smaller than ones determined by the circuit 3 in a controllable manner. When the idle revolving number exceeds a given value at the time of switching change gear, it can be switched to speed- changing steps of small drive torque, and therefore, shocks encountered at the time of switching can be lessened.

Description

[Detailed Description of the Invention] This invention provides a vehicle automatic transmission+? ? The present invention relates to a control device.

Automatic transmissions for vehicles are generally of a type that combines a fluid type torque converter and a planetary gear type transmission 114. In this type of automatic transmission, even when the vehicle is stopped in the neutral range, the output shaft of the hydraulic torque converter is idle, and when the transmission is switched between the neutral range and the dry range. ``If you use Azuma's transmission control system, a shock 'gear' will occur due to shifting and switching of the power system path within the 5V. The higher the engine speed is, the more intense the creep of the car will be after the engine has been turned. In vehicles equipped with an automatic transmission control system that has an engine equipped with an idle rotation control circuit that increases the rotation speed, when switching the shift table 1 from the neutral range to the drive range when the idle rotation speed is high due to an increase in electrical load, If the conventional automatic shift-like control 4bτ is used for this purpose, the shock at the time of switching is large, which not only gives discomfort to the driver, but also causes safety problems because the creep after the switching is completed is also likely to occur.

This invention was made in order to solve the above-mentioned drawbacks of conventional automatic transmission control devices. It is an object of the present invention to provide a control device for an automatic transmission for a vehicle: tj, which reduces shock when switching a power system by performing switching control to a smaller gear ratio.

Below, an embodiment of the present invention will be described in FIGS. 1 and 2.
This will be explained according to the diagram. FIG. 1 is a diagram showing an example of an anastomotic shift characteristic of a three-stage forward shift. In the figure, the solid line shows the shift characteristic when the vehicle speed increases, and the dotted line shows the shift characteristic when the vehicle speed decreases. Further, ■, ■, and ■ in IN indicate the first, second, and third gears, respectively. Each gear stage has a gear ratio of an 1 gear ratio, a 2nd gear ratio, and a 3rd gear ratio.

The first gear ratio is the largest, and the gear ratio decreases in the order of the second gear ratio and the third gear ratio.

FIG. 2 is a block diagram showing the one-butt arrangement of the present invention. In this figure, (1) is the engine thrower)/slot) V opening sensor that generates an analog voltage according to the V opening, and (2) is the vehicle speed sensor that generates an analog voltage according to the vehicle speed. . (3) is a gear ratio determining circuit, which determines the gear ratio for automatic gear shifting based on the output voltage of the thrower opening sensor (1) and the output voltage of the vehicle speed sensor (2). Outputs a signal corresponding to (4)
(5) is the output signal of the gear ratio determining circuit (3), and for example, in the case of the gear ratio corresponding to the first gear shown in FIG. 1, both (4) and (5) are ON.

In the case of 2nd gear, (4) is ON and (5) is OFF, and in the case of 3rd gear, both (4) and (5) are OFF. Further, this changeover of the gear ratio is performed as shown in FIG. 1 in accordance with the opening and opening of the throttle and the vehicle speed. (6) and (7) are ON and OFF when the output of the speed ratio determining circuit (3) is 0No)
This is a solenoid valve that switches to a gear with a gear ratio determined by the gear ratio determining circuit (3) by operating the hydraulic pressure of the gear ratio determining circuit (3). (8) is an idle rotation control actuator, and (9) detects changes in the electrical load of the vehicle due to the operation of a turf, etc., and determines the optimum idle rotation speed of the engine according to the changes in the electrical load. By outputting a signal Q9) corresponding to the idle rotation speed and driving the idle rotation control actuator (8), the idle rotation speed i1i of the engine is maintained at the optimum level, and this idle rotation speed is maintained at the predetermined idle rotation speed. /L/[Ei] This is an idle rotation control circuit that outputs an idle over signal (11) when the rotation number is greater than or equal to the rotation number.

(12) is an accelerator pedal switch that detects the state of the accelerator pedal of the vehicle and outputs a release signal (13) when the accelerator pedal is in the released state. 04] is the idle over signal (11) and the release signal +131
A valve control circuit that cuts off the -output signal (5) of the gear ratio determining circuit (3) and deactivates the solenoid valve (7) when both of the above signals and A gear ratio control circuit is configured to switch and control a gear ratio for automatic transmission (not shown) to a gear ratio smaller than the gear ratio determined by the gear ratio determining circuit (3) when the signals are simultaneously output.

This device below? The operation of Z will be explained. Assume that the vehicle is now stopped in the neutral range and the accelerator pedal μ is released. At this time, when the turf etc. is operated, the idle rotation control circuit (9) determines the idle rotation speed according to the fluctuation of this electrical load, outputs the signal αQ according to the determined idle rotation speed, and outputs the signal αQ corresponding to the determined idle rotation speed. By moving the V-rotation control actuator (8) by 1 meter, the idle speed of the engine is maintained at a higher speed than normal. Now, if the idle rotation speed after this adjustment exceeds the idle rotation speed predetermined in the idle rotation control circuit (9), the idle rotation control circuit (9) will send an idle over signal -'74 (ll'l). In this state, when the transmission (not shown) switches from the neutral range to the drive range, the gear ratio determining circuit (3) determines the first gear ratio as the gear ratio since the vehicle speed is zero, and outputs the solenoid pulp (6). ) By doing both (7), 1.
Trying to change the speed of the car to a gear lever that doesn't make sense. On the other hand, the idle rotation control circuit (9) outputs the idle over signal (11) as described above, and since the accelerator pedal is in the released state, the accelerator pedal switch (12) outputs the release signal (131). Therefore, the gear ratio control circuit 04) cuts off the output signal (5) of the gear ratio determining circuit (3) and outputs an OFF signal to control switching to the second gear ratio, which is smaller than the first gear ratio. Therefore, only the solenoid pulp (6) operates, and the solenoid pulp (
7) remains non-crop σill. Therefore, the transmission (not shown) is switched from the neutral range to the 2nd gear, which has a gear ratio smaller than the 1st gear ratio. Even after the interlocking operation is completed, is M relative to the vehicle by the amount of gearing compared to the vehicle speed? The forces are smaller and the vehicle has less creep.

Next, when the accelerator pedal μ is depressed to start the vehicle, the accelerator pedal switch (121) is activated and the release signal (13) is released, so the idle rotation control circuit (9) outputs an idle over signal (Ill). Even if the gear ratio control circuit (I4) is the gear ratio determining circuit (3)
By passing the output signal (5), the solenoid pulp (7) is actuated, and the transmission is switched from the second gear to the first gear. As a result, the vehicle starts at the vehicle speed, and as the vehicle speed increases and decreases, the vehicle speed changes as shown in Figure 2.
iυ gear shifting is performed.

In the above-described embodiment, the shift is made to the second gear when switching from the neutral range to the drive range, but the same effect can be obtained even if the shift is made to the third gear.

Moreover, it goes without saying that (ii) (a) can also be applied to vehicles that shift in four or more stages. Further, although the throttle opening degree and the vehicle speed signal are used to determine the gear ratio, the gear ratio may also be determined using the engine rotational speed signal zero and the vehicle speed.

As explained above, in this explanation, when switching this transmission from the neutral range to the drive range, if the engine's idle speed is higher than the predetermined speed, the gear ratio will be smaller than the vehicle gear. Since the gears are switched to a gear position with lower drive torque, the shock at the time of turning is reduced, the creep of the vehicle is also reduced, and the driver does not feel uncomfortable, improving safety. Also,
After the vehicle starts, the vehicle operates at variable speeds as shown in FIG. 1, so that acceleration and other characteristics of the vehicle are not impaired at all.

[Brief explanation of drawings]

Figure 1 is a diagram of the speed change characteristics of a vehicle, and Figure 82 is a block IM+ showing a circuit (definition) according to an example of the present invention.・
・Vehicle speed sensor, (3)... Four speed ratio determination circuit, (6) and (7)... Gear ratio cutter, (9)... Idle/I/rotation control circuit, ( 12)... Accelerator pedal switch, (141... Gear ratio control circuit. Agent: Masuo Oiwa Figure 1 $ Payment Procedures Amendment - (Voluntary) 1 - Director-General of the Agency 1 Display in Small A 11 Wait 1*i 1976-76702
No. 2, Title of the invention 1. Toro control device for automatic transmission for vehicles: 3. Person making the amendment 5, Detailed explanation of the invention column 6 of the specification subject to amendment, (Contents of amendment (1) In the 9th line of page 5 of the specification, ' (2) The 2nd line number on page 6 of the same page is corrected as 1 both signals and 1 signal at the same time. (3) 8th page of the same page In the 7th line, it says 1 in Figure 2, 2'f.
Correct it to figure f11. (4) Page 8, line 16, 1 ko 1 ko 1 ko 1 ko 1 yo, 1 yo 1 yo and J”. (5) Insert the following sentence between page 8, line 16 and line 17 of Ki. 1.Also, we have described the throttle sensor (1) and the speed sensor (2) that generate analog signals, but even if you use a sensor that can give a digital false signal, it will not work.
stomach. more than yo

Claims (1)

[Claims] x 7-) Speed ratio determination that determines the speed ratio based on the signal corresponding to the throttle opening or engine speed and the number corresponding to the speed of the vehicle and outputs a predetermined signal. According to the output signal of this speed ratio determining circuit, the speed change 4i, p is 2? Switch the speed ratio'i:l(Z 1
If the engine idle speed is higher than the specified rotation speed, the idle is over. An accelerator pedal switch that outputs an idle/I/rotation control circuit that outputs a signal when the accelerator pedal is in the open state, and a release signal of this accelerator pedal switch. ° and M'IJ'r Flood Idol Episode 1
111r idle over of control circuit'! ui-”
1m when both 1=r of j are output at the same time
Switch the gear ratio of 7 to a lower gear ratio than the legal gear ratio by the gear ratio determination circuit.
A control device for a vehicle automatic transmission equipped with a speed ratio control circuit that performs B111.