JPS6220937A - Speed shift control device in vehicle speed change gear provided with counter speed change gear - Google Patents

Abstract

PURPOSE:To shorten the time of inhibition of speed shift, by controlling the time of inhibition of shift of one of speed change gears in accordance with the temperature of oil during shift of the other speed change gear. CONSTITUTION:An automatic speed change gear 20 is composed of a main speed change gear 20a and a counter speed change gear 20b. A control circuit 30 receives signals from sensors disposed in several section in a vehicle, includ ing an engine 10 and the automatic speed change gear 20. Reference numeral 27 denotes a temperature sensor for detecting the temperature of hydraulic oil in the automatic speed change gear 20. The control circuit 30 is composed of a microcomputer and performs control operation as follows: At first the temperature of oil is determined after determination of the throttle opening degree, and one of previously determined times of inhibition of speed shift is selected in accordance with the throttle opening degree and the temperature of oil. In this arrangement since the time of inhibition of speed shift is set such that the higher the temperature of oil, the shorter the time of inhibition becomes, a rapid speed shift may be made as the temperature of oil is elevated.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a shift control device for a vehicle transmission with an auxiliary transmission. This relates to a control device that is prohibited.

[Prior Art] Conventionally, in this type of transmission, shifting shock occurs when both the main and auxiliary transmissions are shifted at the same time, so a means for prohibiting shifting of one gear while shifting the other has been proposed, for example, in Japanese Patent Laid-Open No. 56-35.
This is known as shown in Japanese Patent No. 850. In addition, this is a device that uses a hydraulic actuator to change gears in the transmission, and allows the sub-transmission to be switched even while driving.When switching the sub-transmission, the main transmission is prohibited from shifting for a predetermined period of time. There are also known devices that reduce gear shift shock.

[Problems to be Solved by the Invention] However, since the time during which the main transmission is prohibited from shifting is set to a long fixed time on the throttle sensor, even if the accelerator is depressed deeply, However, the problem was that the gears did not shift easily and the driving feeling was not good.

[Means for Solving the Problems] As shown in FIG. A sub-transmission C is connected to the output shaft of the main transmission IIS and is capable of changing variable speeds independently of the main transmission A; an actuator D for switching, and a speed change command means E for sending a command signal to the actuator D to command a speed change.
and an oil temperature detection means F for detecting 1 degree of the above υj1211 pressure oil.
The shift command means E receives the detection signal from the oil temperature detection means F, and sets a prohibition time for prohibiting the shift of the other transmission when one transmission is switched. The present invention is characterized in that it has a shift prohibition command means Gll for instructing prohibition of switching of the other transmission for a prohibition time, and the prohibition time is set variably according to the oil temperature.

Here, it is assumed that the setting value of the above-mentioned prohibition time includes either a map value or a value obtained from an operational formula.

[Function] In a vehicle transmission consisting of a main transmission and an auxiliary transmission, shock will occur if both gears are shifted at the same time. It is prohibited. By the way, in a device in which the auxiliary transmission is operated using pressure oil, the oil flow changes as the oil temperature increases, so the shift time changes. In the present invention, paying attention to this point, for example, as the oil temperature rises, the shift prohibition time is shortened to quickly return the main transmission to a state in which the shift is possible.

[Example 1 Examples of the present invention will be described below.

In FIG. 2, 10 is an engine, 20 is an automatic transmission, and the automatic transmission 20 includes a main transmission 20a and a sub-transmission 2.
It consists of 0b. The main transmission 20a includes a solenoid 2
By energizing or de-energizing the solenoid 1a and 21b, the pressure oil is controlled to enable four-speed shifting, and by energizing or de-energizing the solenoid 21c, the lock-up clutch is actuated by hydraulic pressure. On the other hand, the sub-shift fi 20b is set to 1-1i in order to obtain high torque during four-wheel drive, for example.
It enables two-stage gear shifting of LO and LO, and is switched by energizing or de-energizing the solenoid 21d.

The solenoids 21a to 21d are driven by signals from a control circuit 30.
inputs signals from sensors placed in various parts of the vehicle including the engine 101 and automatic transmission 20.

These sensors include a throttle sensor 13 that detects the opening of a throttle valve 12 disposed in the intake passage 11 of the engine 10, and a shift position switch that detects the operation of a manual lever (not shown) of the automatic transmission 1120. 23. A vehicle speed sensor 22af3 and a speedometer sensor 22b that detect the rotational speed of the output shaft (not shown) of the automatic transmission 20 which is proportional to the vehicle speed, a brake switch 23, and a transfer position switch 25 that commands switching of the sub-transmission 20b. , and automatic transmission 2
The oil temperature sensor 27 detects the temperature of the control pressure oil within 0.

The control circuit 30 is composed of a well-known microcomputer, that is, it is composed of a CPU, RAM, ROM, input/output ports, etc., and the ROM contains a main transmission! A shift up pattern and a shift down pattern for switching the fi 20a are stored, as well as flowcharts as shown in FIGS. 3 and 4 (A)<B).

Next, the main routine showing the shift control program shown in FIG. 3 will be explained first. At step 110, C
PtJ is initialized, and in step 120, the vehicle speed detected by the heavy speed sensor 22a is calculated. Then, in step 130, shift position switch 2
3. From transfer position switch 25! No. 8 is read and the process proceeds to step 140. In step 120, a shift determination is made as to whether to shift up or down based on the vehicle speed calculation result and the throttle opening, and based on the signal from the transfer position switch 25, the auxiliary transmission 20b is shifted from Hi to LO. It is determined whether or not a shift has been commanded, and if a shift has been commanded, an interrupt process according to the flowchart of FIG. 4 (A>(B)) is executed. A speed change process is executed by the output signals to the solenoids 21a to 21d.

In the interrupt routine of FIG. 4(A), it is first determined in step 210 whether or not the throttle opening is 00, and if it is θ0, step 3 of FIG. 4(B)
Go to 00. In this step 300, the oil temperature sensor 27
It is determined whether the oil temperature is T1 based on the detection signal of
If T1, prohibition time A1 is set (step 305).

That is, A1 is selected from the map shown in Table 1. On the other hand, if the oil temperature is not T1, the process proceeds to step 310, where it is determined whether or not the oil temperature is T2, and if it is T2, a prohibition time A2 is set as a map value (step 315).
). Then, in the subsequent steps 320 to 335, the oil mT3 and T4 are determined in the same manner as in the steps 300 to 315, and the prohibition times A3 to A of the corresponding map values are determined.
Select 4.

Then, a shift prohibition process is started by prohibiting switching of the solenoids 21a and 21b. After starting this prohibition process,
The solenoid 21d of the sub-shift t120b is electrically turned on and operated to the Lo gear side by the hydraulic circuit. Next, the prohibition time selected from the above map is subtracted, and when the prohibition time has elapsed, the shift prohibition is canceled (steps 360 to 3).
80).

On the other hand, when it is determined in steps 220 to 280 of FIG. 4(A) that the throttle opening is between θ1 and θ7, a flowchart similar to that of FIG. 4(B) is executed for each throttle opening, and the oil The prohibition times corresponding to the temperature, that is, the prohibition times shown in Table 1 are set respectively. As a result, oil temperatures T1 to T4 at throttle openings θO to θ7
A prohibition time is set according to the prohibition time, and the main transmission 20a becomes ready for shifting immediately after the prohibition time has elapsed. In this case, since the prohibition time is set shorter as the oil temperature rises, the prohibition time does not become longer than necessary in a transmission that is capable of quickly changing gears as the oil temperature rises. Therefore, after the sub-transmission is shifted, the main transmission is quickly returned to a state in which the gear can be shifted, so that the shift is executed in accordance with the depression of the accelerator, and an excellent driving feeling is obtained.

Table 1 [Effects of the Invention] As explained above, according to the present invention, when one transmission shifts, the other transmission is prohibited from shifting depending on the temperature of the pressure oil that operates the transmission. Since the time is controlled by tilt, the shift prohibition time is shortened.

Therefore, since the gears are changed quickly, an excellent driving feeling can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic block diagram showing the configuration of the present invention, Fig. 2 is a schematic block diagram showing an embodiment of the present invention, Fig. 3 is a flowchart according to the embodiment, and Figs. 4 (A) and (B) are It is a flowchart according to the same embodiment. A...Internal combustion gear B...Main transmission C...Sub-transmission D...Actuator E...Shift command means G...Shift prohibition command means F...Oil temperature detection means

Claims (1)

[Scope of Claims] A main transmission connected to the output shaft of an internal combustion engine, and a sub-transmission connected to the output shaft of the main transmission and capable of changing gears independently of the main transmission. an actuator that switches the gears of the main transmission and the sub-transmission using control pressure oil; a shift command means that sends a command signal to the actuator to command a shift; and an oil temperature detector that detects the temperature of the control pressure oil. and means, wherein the shift command means receives the detection signal from the oil temperature detection means, sets a prohibition time for prohibiting shifting of the other transmission when switching one transmission, and prohibits the shift of the other transmission. A transmission for a vehicle with an auxiliary transmission, characterized in that the transmission prohibition command means (1) commands to prohibit switching of the other transmission for a certain period of time, and the prohibition period is set variably according to oil temperature. transmission control device.