JPS61257332A - Automatic gearshift controller for automobile - Google Patents

Abstract

PURPOSE:To reduce a shift shock without entailing any increase in a heating value of shift elements including a brake band and so on, by regulating engine output so as to come nearer to output after the shift timing, at the time of gearshifting. CONSTITUTION:A controller 13 judges the shift element of a transmission by each signal out of a throttle sensor 14 and a car speed sensor 15 and thereby outputs at operating signal to each of solenoid valves 12A-12E whereby coupling and release of each shift element are carried out. In addition, the controller 13 outputs a fuel-cut signal to a fuel injection controller 18 for the specified time long when it judges as gearshifting time. With this constitution, while the fuel-cut signal is inputted, the output of an injection pulse signal to a fuel injection valve 17 is stopped and fuel injection is also stopped. Therefore, even if a difference in revolving speed between both engine and driving wheel sides is large, a part of the turning energy is absorbable at the engine side, thus a shift shock is reducible.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to an automatic transmission control device for automobiles.

<Prior Art> An automatic transmission control device for an automobile is generally equipped with an automatic transmission having a planetary gear device, and the transmission operation is performed by releasing one of the transmission elements and connecting the other. The coupling and disengagement are determined in a single step in four cases, such as when the vehicle freezes and the throttle opens and closes.

That is, FIG. 4 shows an automatic transmission, which includes a torque converter 1, a bomb impeller 1m, a turbine impeller 1b, and a stator 1C.

2 is a transmission including a planetary gear device 2a, a front clutch 2b, a rear clutch 20. Brake band 2d, low & reverse brake 2e, one-way clutch 2f.

Equipped with 2g parking ball.

FIG. 5 shows the engagement and release states of the transmission elements at various shift lever positions. In FIG. 5, "+" indicates a coupled state, and "-" indicates a released state.

For example, if we consider shifting from 1st to 2nd gear in D range, one-way clutch 2f is released and brake band 2d is
Speed change is achieved by coupling the two. In this way, engine output is transmitted to the drive wheels of the vehicle via the torque converter 1 and transmission 2.

Here, hydraulic oil is supplied to each transmission element via a solenoid pulp for supplying hydraulic oil in response to a control signal from a control device shown in the diagram based on the driving conditions of the automobile, such as vehicle speed and throttle opening, and The operation is erroneous.

<Problems to be Solved by the Invention> By the way, in automatic transmission control devices for automobiles such as those mentioned above, there is a difference in rotational speed between the engine side and the driving wheel side during gear shifting, and a gear shifting shock occurs when they are connected. . For this reason, it is conceivable that if the shift operation time of each shift element is lengthened, the half-clutch state is lengthened, and the energy accompanying the difference in rotational speed is absorbed by the sliding friction of the clutch, reducing shift shock. If the half-clutch state is prolonged, the amount of heat generated by each speed change element (for example, the brake band 2d) increases, resulting in a problem of reduced durability.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an automatic shift control device for an automobile that can reduce shift shock while suppressing an increase in the amount of heat generated by each shift element and preventing a decrease in durability. The purpose is to

<Means for Solving the Problems> Therefore, in the present invention, as shown in FIG. 1, the gear shifting elements of the automatic transmission B are operated by a control signal from the control means A based on the operating conditions. In the automatic transmission control device for automobiles, a gear change detection means C detecting the time of gear change;
The engine is equipped with an engine output adjusting means E that adjusts the output of the engine at the time of the shift so that it approaches the output after the shift timing.

In this way, by adjusting the engine output during gear shifting, the engine side and the drive side are smoothly connected, and gear shifting shock is suppressed.

<Example> An example of the present invention will be described below with reference to FIGS. 2 and 3.

In the figure, the transmission of the automatic transmission 11 composed of a torque converter and a transmission includes the front clutch, rear clutch, and
In order to control the supply of hydraulic oil to brake bands, low & reverse brakes, one-way clutches, etc., it is installed in a hydraulic passage (not shown) leading to these, and the amount of hydraulic oil supplied is controlled by controlling the valve opening duty. Solenoid pulps 12A to 12K are provided to control the. A valve opening duty signal from a control device 13 serving as a control means is input to these solenoid pulps 12A to 12E.

Furthermore, detection signals are input to the control device 13 from a throttle sensor 14 that detects the opening of an intake throttle valve (not shown) and a vehicle speed sensor 15 that detects vehicle speed. A fuel injection valve 17 is provided to inject and supply fuel to the engine 16, and an injection pulse signal is input to the fuel injection valve 17 from a fuel injection control device 18.

The control device 13 includes a throttle sensor 14 and a vehicle speed sensor 1.
By determining the speed change element of the transmission based on the detection signal of 5 and outputting an operating signal to the solenoid pulps 12A to 12K, each speed change element is connected and released to perform a speed change operation as shown in FIG. It is configured. Further, when the control device 13 determines that it is time to shift, it operates according to the flowchart (K) shown in FIG. 3, and outputs a fuel cut signal to the fuel injection control device 18 for a predetermined period of time during the shift. As a result, the fuel injection control device 18 stops outputting the injection pulse signal to the fuel injection valve 17 while the fuel cut signal is input, and fuel injection is stopped.

Here, the control device 13 constitutes a shift detection means, and the control device 13 and the fuel injection control device 1B constitute an output adjustment means.

FIG. 3 shows a flowchart during upshifting, and the operation will be explained based on this.

When it is determined in S1 to shift up, the control device 13 sends a fuel cut signal to the fuel injection control device 1B in S2 for a predetermined period of time (for example, 0.2-0.
3 seconds) Output.

When the fuel cut signal is input, the fuel injection control device 18 determines in S3 whether the engine rotational speed is equal to or higher than a predetermined value, and determines in 84 whether the cooling water temperature is equal to or higher than a predetermined value. When both of these are YES, that is, when both of them are equal to or higher than a predetermined value, it is determined that engine stall and an excessive decrease in engine speed can be prevented, and fuel injection is performed while the fuel cut signal is input in S5. The output of the injection pulse signal to the valve 17 is forcibly stopped.

As a result, fuel supply to the engine is stopped at the initial stage of gear shifting, resulting in a decrease in engine output. Therefore, when the automatic transmission 11 connects the engine 16 to the drive wheel side, the engine output decreases, so even if the difference in rotation speed between the engine side and the drive wheel side is large, the engine rotation speed will not follow the drive wheel side. A part of the energy of the difference in rotational speed (a sharp fall) can be absorbed by the engine 16 side, and shift shock can be reduced. In this way, since the shift operation can be performed in a short time while suppressing shift shock, the heat generation of each conversion element can also be suppressed, and the durability of the shift element can be improved. Furthermore, fuel efficiency is improved by stopping fuel injection during gear shifting.

Furthermore, although the present embodiment has been described with respect to the time of upshifting, the amount of fuel is increased during downshifting in order to reduce the shift shock.

In this embodiment, the engine output is adjusted by cutting the fuel, but the engine output may be lowered by retarding the ignition timing during gear shifting.

<Effects of the Invention> As explained above, the present invention adjusts the engine output at the time of shifting so that it approaches the output after shifting.
Even if there is a difference in rotational speed between the engine side and the drive wheel side, part of the rotational energy can be absorbed by the engine side, which suppresses the increase in heat generation of each transmission element and improves durability. while reducing gear shift shock.

[Brief explanation of drawings]

Fig. 1 is a diagram corresponding to claims of the present invention, Fig. 2 is a block diagram showing a first embodiment of the present invention, Fig. 3 is a flowchart of the same as above, Fig. 4 is a block diagram of an automatic transmission, and Fig. 5 is a block diagram showing the first embodiment of the present invention. This is a color representation showing the engagement/disengagement state of shift elements at various shift positions. 11... Automatic transmission 13... Control device 14
...Throttle sensor 15...Vehicle speed sensor 16
...Engine 18...Fuel injection control device Applicant: Nippon Electronics Co., Ltd. Agent Patent attorney Fujio Sasashima Figure 3

Claims (1)

[Claims] In an automatic transmission control device for an automobile, the transmission element of an automatic transmission is operated to change gears by a control signal from a control means based on driving conditions of the automobile. An automatic shift control device for an automobile, comprising: an engine output adjustment means that adjusts the output so that it approaches the output after the shift timing.