JPS62152926A - Controller for automatic transmission for vehicle - Google Patents

Abstract

PURPOSE:To reduce the speed change shock by carrying out the speed change control for an automatic transmission on the basis of the detection results for load and car speed according to the constant speed traveling pattern in constant speed traveling and setting the down-sift pattern outside the set car speed range in the constant car speed traveling. CONSTITUTION:The load of an internal combustion engine A and car speed are detected by the detecting means B and C, respectively. Further, the output of the internal combustion engine A is adjusted by a constant speed traveling means D so that the car speed becomes constant by the instruction on the basis of the constant speed traveling conditions. Further, the ordinary speed change pattern which is predetermined is set, and the constant speed traveling pattern with which down-shift is not performed is set by a speed change pattern setting means E in the set car speed range in which the constant speed traveling is not carried out, having the load and car speed as parameters. In the ordinary traveling, an automatic transmission F is speed- change-controlled by a control means G on the basis of the detection result supplied from the means B and C according to the ordinary speed change pattern in the ordinary traveling and according to the constant speed traveling pattern in the constant speed traveling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a vehicular automatic transmission that performs effective shift control during constant speed driving control.

[Prior Art] Conventionally, automatic transmissions for vehicles have been controlled by using vehicle speed and engine load (e.g., throttle opening) as parameters, determining shift conditions according to a predetermined shift pattern, and performing shift processing. It was

By the way, a vehicle has been developed that is equipped with a so-called constant-speed driving device that adjusts the throttle opening to maintain a set target vehicle speed and performs constant-speed driving, together with an automatic transmission controlled as described above. There is.

Regarding the control of such an automatic transmission of a vehicle, for example, Japanese Patent Application No. 59-269828 has been proposed. That is, a first shift pattern in which shift control is performed between all three shift stages, and a second shift pattern in which shift control is performed between a shift stage that does not include at least one intermediate shift stage among the three shift stages. During constant speed driving control, by selecting the above-mentioned first shift pattern and switching over more gears, the rate of change in driving force due to downshifting is reduced and the shift shock is reduced. The purpose is to reduce the

[Problems to be solved by the invention] However, in the above-mentioned conventional technology, even during constant speed driving control, the first
Shift control of the automatic transmission was performed based on the same shift pattern as shown in FIG. 1 during normal driving. Therefore, for the purpose of maintaining the target vehicle speed during constant speed driving control, the throttle opening is adjusted according to load fluctuations as indicated by the arrows a or b in the figure.
If the throttle opening is changed as shown in , a phenomenon occurs in which the throttle opening frequently exceeds the upshift shift line and the downshift shift line. That is, there is a problem in that due to changes in the throttle opening degree accompanying constant speed driving control, gear changes are repeated between two gears, resulting in hunting in the gear change control. As a result, shift shocks occur frequently, and especially shift shocks caused by increased driving force during downshifts significantly reduce ride comfort.

[Means for Solving the Problems] The present invention, which has been made to solve the above problems, as illustrated in FIG. a vehicle speed detecting means C; a constant speed traveling means for adjusting the output of the internal combustion engine A so that the vehicle speed is constant according to a command based on the constant speed traveling condition; In the set vehicle speed range layer ■ in which a normal shift pattern and constant speed running are performed, the shift pattern setting means E sets a constant speed running pattern without downshifting; A control means G for controlling the automatic transmission F to change speed based on the detection results of the load detection means B and the vehicle speed detection means C, sometimes in accordance with the constant speed traveling pattern. The gist is the control device of the machine.

Here, the load detecting means B can be composed of, for example, a throttle position sensor or a torque sensor.

The vehicle speed detection means C may be constituted by, for example, a magnet and a reed switch, or may be realized by, for example, a pulse gear and an electromagnetic pickup.

The constant speed traveling means may be, for example, one that adjusts the throttle opening of the internal combustion engine A so that the vehicle speed always remains at the set vehicle speed.

The speed change pattern setting means F may be, for example, a nonvolatile memory. Here, the normal driving pattern is a pattern that uses the load of the internal combustion engine A and the vehicle speed as parameters, and defines both an upshift and a downshift shift pattern between a plurality of gear positions. Further, the constant speed driving pattern is a speed change pattern in which downshifting is not performed in a set vehicle speed range in which constant speed driving is performed. For example, this can be achieved by setting all downshift patterns to a sufficiently low predetermined vehicle speed or less that the above-mentioned set vehicle speed cannot be reached. Further, for example, it may be set so that no downshift is performed in a vehicle speed range from the set vehicle speed to a vehicle speed lower by a certain vehicle speed.

The constant speed traveling means D1, the speed change pattern setting means E, and the control means G can be realized, for example, as independent logic circuits. For example, ROM, centering on the well-known CPU,
It may be configured as a logic operation circuit together with peripheral circuit elements such as a RAM, and implement the above-mentioned means according to a predetermined processing procedure.

[Function] In the present invention, when traveling at a constant speed using the constant speed traveling means, the control means G follows the constant speed traveling pattern of the shift pattern setting means E, and based on the detection results of the load detecting means B and the vehicle speed detecting means C. Performs speed change control of automatic transmission F. Here, the constant speed driving pattern is a speed change pattern in which a downshift is not performed within a set vehicle speed range in which constant speed driving is performed.

Therefore, the downshift pattern is set outside the set vehicle speed range when driving at a constant speed, so even if the load on the internal combustion engine A changes to maintain the constant speed driving, at least a downshift will be performed. This makes it possible to prevent repeated gear changes associated with constant speed driving.

[Example] FIG. 2 shows a schematic configuration of an embodiment of the present invention.

In FIG. 2, the output of an engine 1 is transmitted to drive wheels (not shown) via an automatic transmission 2.

In the automatic transmission 2, the hydraulic pressure is controlled by energizing or de-energizing the two solenoid valves 3.4 to enable four-speed shifting, and the lock-up clutch is hydraulically controlled by energizing or de-energizing the solenoid valve 5. It is what activates it. The above solenoid valve 3.4.5 is an electronic control device 6
The electronic control unit 6 is driven by signals from the engine 1 and the automatic transmission 2, and inputs signals from sensors and other devices arranged in various parts of the vehicle, including the engine 1 and automatic transmission 2.

The sensors include a throttle position sensor 9 that detects the opening of a throttle valve 8 disposed in the intake passage 7 of the engine 1, a neutral start switch 10 that detects the shift position of the automatic transmission 2, and an automatic transmission that is proportional to the vehicle speed. A vehicle speed sensor 11 detects the rotational speed of the output shaft (not shown) of No. 2, and a pattern select switch 1 selects a speed change pattern from among economy, power, and manual to change the speed change point and lockup point.
It is composed of 2.

Note that the throttle position sensor 9 detects the opening degree of the throttle valve 8 and generates two communication signals. Further, the vehicle speed sensor 11 generates a pulse signal whose frequency is proportional to the vehicle speed.

The electronic control device 6 also receives a constant speed travel set or reset 1 signal from a constant speed travel device 13 that adjusts the opening degree of the throttle valve 8 to perform constant speed travel.

The electronic control device 6 includes a CPU 3 as shown in FIG.
1. ROM32. RAM33. It is constructed by connecting an input port 34 and an output port 35 via a common bus 36. Input ports 1 to 34 receive signals from the above-mentioned sensors and devices through buffers 37a, 37b, 37c, and 3.
7d and the conversion circuit 38a. The output boat 35 is connected to drive circuits 39a, 39b, and 39c for the solenoid valves 3, 4.5 described above.

The conversion circuit 38a shapes the pulse signal of the vehicle speed sensor 11 into a waveform.

In the ROM 32 of the electronic control unit 6, various speed change patterns as shown in FIGS. 4 to 9 are stored. In these shift patterns, solid lines indicate upshift shift lines, and broken lines indicate downshift shift lines.

When the shift position detected by the neutral start switch 10 is in the drive range (D>), the CPU 31 follows the instructions of the pattern select switch 12 and performs the shift control as shown in FIGS. 4 and 5 for the economy pattern, power pattern, and manual pattern, respectively. The CPU 31 selects each of the shift patterns shown in FIG. When in the low range (L), the shift patterns shown in FIG. 8 are selected.

Roughly speaking, when the CPU 31 receives a constant speed driving signal outputted by the constant speed driving device 13 during constant speed driving control,
Select the constant speed running pattern shown in FIG.

The CPU 31 reads out the throttle valve openings detected by the throttle position sensor 9 and the vehicle speed from the vehicle speed sensor 11 based on the shift pattern selected in each case as described above.

That is, from the current gear position and throttle valve opening degree stored in the RAM 33, the vehicle speed of the shift line for upshifting the current gear position and the vehicle speed of the gear change line for downshifting the current gear position are read.

Then, the vehicle speed on both shift lines is compared with the current vehicle speed detected by the vehicle speed sensor 11, and if the current vehicle speed is higher than the vehicle speed on the upshift shift line, the gear is shifted up by one gear, and the current vehicle speed is changed. When the vehicle speed is lower than the downshift shift line, the gear is controlled to downshift by one gear. Furthermore, when the current vehicle speed is between the vehicle speed of the upshift transmission line and the vehicle speed of the downshift transmission line, neither upshift nor downshift is performed.

By the way, among the above-mentioned speed change patterns, the one shown in FIG. 9 is a characteristic constant speed running pattern of the present invention. In other words, all downshift lines are at a vehicle speed of 40 [km/km/h].
h] or less.

Therefore, in the vehicle speed range that can be the target vehicle speed for constant speed driving, as shown by arrows C and d in the same figure, even if the throttle opening changes to maintain constant speed driving, downshifting is not performed. .

The above-mentioned shift up and down shift control by the CPU 31 is performed via the output boat 35, and the solenoid valve 3.4 is turned on or off, that is, energized or de-energized, as shown in Table 1 below. by 4
The gears are shifted in stages.

Table 1 The operation of the CPtJ31 as described above is achieved by executing the program shown in FIG. 10 stored in the ROM 32.

FIG. 10 shows the speed change control process. At step 100,
The shift lever position is input from the neutral start switch 10, and in step 105, the throttle opening is input from the throttle position sensor 9. Next, in step 110, a signal is input from the vehicle speed sensor 11, and in step 115, the vehicle speed is calculated. Next, step 12
0, a constant speed traveling signal is input from the constant speed traveling device 13, and the process proceeds to step 125, where it is determined whether the constant speed traveling signal is in the set state.

If it is determined that the constant speed driving signal is in the set state, the process proceeds to step 130, where the constant speed driving pattern shown in FIG. Step 1
Shift processing is performed by driving a solenoid valve at 80.

On the other hand, if it is determined in step 125 that the constant speed driving signal is not in the set state, the process proceeds to step 140, where a pattern instructed by the driver is inputted from the pattern select switch 12. Next, the process proceeds to step 145, and it is determined whether or not the economy pattern has been selected. If an affirmative judgment is made, the process proceeds to step 150, and if the drive range (D) is selected according to the shift lever position in this case, the shift lever is changed as shown in FIG. Then, the shift pattern shown in FIG. 7 is selected if the second range (2) is selected, and the shift pattern shown in FIG. 8 is selected if the shift pattern is the low range (L). The solenoid valve is driven to perform gear change control.

If it is determined in step 145 that the economy pattern has not been selected, the process proceeds to step 160, where it is determined whether or not the power pattern has been selected. If an affirmative determination is made, the process proceeds to step 165, where the power pattern in each range changes to the fifth position according to the shift lever position in this case.
Selected from the shift patterns shown in Fig. 7 and Fig. 8,
Proceed to step 180 described above. If it is determined in step 160 that no power pattern is selected, the process proceeds to step 170, and the manual and pattern in each range are selected according to the shift lever position in this case.
The shift pattern is selected from the shift patterns shown in FIGS. Thereafter, the main shift control process includes steps 100 to 180 described above.
is executed repeatedly.

Therefore, according to the above configuration, during constant speed driving control, a constant speed driving pattern in which the downshift pattern is set to a vehicle speed of 40 [km/h] or less is selected, and based on the constant speed driving pattern, the throttle opening is adjusted based on the constant speed driving pattern. Shift control is performed using the following steps.

As a result, even if the constant speed traveling device varies the throttle opening according to load fluctuations in order to maintain constant speed traveling, once an upshift is performed, the shift-down is not performed. Hunting can be prevented.

Furthermore, the shift shock caused by the increase in driving force caused by downshifting during constant speed driving control is eliminated, improving ride comfort.

In general, since a dedicated and simple shift pattern is used during constant speed cruise control, there is no need to set a shift pattern that performs complex control processing that combines constant speed cruise control and automatic shift control, making vehicle development easier. Man-hours can be reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, and it goes without saying that it can be implemented in various forms without departing from the gist of the present invention. .

"Effects of the Invention" As explained above, according to the present invention, it is possible to prevent gear change hunting caused by fluctuations in throttle opening during constant speed driving control, so that gear change control is optimized and gear change It is possible to reduce shock and improve riding comfort.

[Brief explanation of drawings]

FIG. 1 is a basic configuration diagram illustrating the configuration of the present invention, FIG. 2 is a schematic configuration diagram illustrating an embodiment of the present invention, FIG. 3 is a block diagram similarly illustrating the electronic control device, and FIGS. FIG. 9 is a graph showing the same shift pattern, FIG. 10 is a flowchart thereof, and FIG. 11 is a graph showing the shift pattern of the prior art. A...Internal combustion engine B...Load detection means C...Vehicle speed detection means D...Constant speed traveling means E...Shift pattern setting means F...Automatic transmission G...Control means 1 ... Engine 2 ... Automatic transmission 6 ... Electronic control device 9 ... Throttle position sensor 11 ... Vehicle speed sensor 13 ... Constant speed traveling device 31 ... CPLI

Claims (1)

[Scope of Claims] 1. A load detection means for detecting the load of the internal combustion engine, a vehicle speed detection means for detecting the vehicle speed, and an output of the internal combustion engine so that the vehicle speed is constant based on a command based on a constant speed running condition. and a shift pattern setting that uses the load and vehicle speed as parameters to set a predetermined normal shift pattern and a constant speed drive pattern in which no downshift is performed in a set vehicle speed range in which constant speed drive is performed. and control means for controlling the automatic transmission to shift according to the normal shift pattern during normal driving, and according to the constant speed traveling pattern when driving at a constant speed, based on the detection results of the load detecting means and the vehicle speed detecting means. A control device for an automatic transmission for a vehicle, comprising: