JP2546234B2 - Automatic transmission control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control device for an automatic transmission that reduces a shock generated from the automatic transmission when a shift lever is operated from a neutral range to a forward range.

[Prior Art] In an automatic transmission for a vehicle, in order to prevent a shock generated when a shift lever is operated from a neutral range to a forward range, engagement of a lowest speed gear stage (first
Prior to (speed), a gear higher than the lowest gear (for example, the third gear) is temporarily engaged. According to such control, since the gear ratio of the upper gear is smaller than that of the lowest gear, the shock when operating the shift lever is reduced.

By the way, there is a technology to further reduce the shock at the time of operating the shift lever by changing the switching timing from the upper gear stage to the lowest gear stage, which is temporarily engaged, based on the rate of change of the engine speed. It is disclosed. (JP Sho 59
-175658 publication).

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technique, since the gear stage temporarily higher than the lowest gear stage, for example, the third gear stage is uniformly switched, the response at the time of starting There were cases where sex was sacrificed. That is, when the occurrence of unpleasant shock is small, for example, when the engine speed is low, the responsiveness at the start is sacrificed.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to solve the above problems and provide a control device for an automatic transmission that has a small shift shock and realizes a smooth start.

[Means for Solving Problems] As a means for solving the above problems and achieving the object of the present invention, as shown in FIG. 1, a gear shift for shifting the automatic transmission A based on speed and load. Means B, a shift lever operation detecting means C for detecting the operation of the shift lever from the neutral range to the forward range lens, and a shift lever operation detecting means C for detecting the operation of the shift range from the neutral range to the forward range, A control unit for an automatic transmission, comprising: a switching unit D for instructing the gear shift unit B to shift to a gear ratio smaller than the largest gear ratio and then a gear shift to the largest gear ratio; Engine speed sensor E for detecting speed
Based on the detection value of the engine speed sensor E, the speed ratio at which the speed changeover is commanded to be smaller than the maximum speed ratio by the switching means D is based on the detection value of the engine speed sensor E, and the higher speed speed is changed. A gist of a control device for an automatic transmission is characterized by including a switching position instructing means F for instructing a determination so as to be in a gear.

The automatic transmission A is, for example, a stepped type or a stepless type automatic transmission whose gear ratio is changed.

The switching position instructing means F instructs the switching means D, for example, based on the graph shown in FIG. That is, in the graph, the vertical axis represents the first to fourth speeds and the horizontal axis represents the engine speed, and the speed is set according to the engine speed.
That is, the graph shows the upper shift speed for a high engine speed.

[Operation] In the present invention, the switching position instructing means F calculates, based on the detected value of the engine speed sensor E, the gear stage (gear ratio) temporarily achieved from the graph shown in FIG. 2, for example.
Then, the switching position instructing means F instructs the switching means D of the calculated shift speed (gear ratio). When the shift lever operation detecting means C detects an operation time from the neutral range to the forward range, the switching means D instructed the speed change step (speed change ratio) causes the speed change means B to calculate the calculated speed change step. After the gear change to (gear ratio) is temporarily instructed, the gear change to the lowest speed stage (largest gear ratio) is instructed. The shift means B shifts the automatic transmission A to the shift speed (gear ratio) instructed by the switching means D.

Therefore, when the shift lever is operated from the neutral range to the forward range, the automatic transmission A is
The lowest gear (largest gear ratio) is temporarily set through the gear (gear ratio) calculated based on the engine speed.
The gear is switched to.

As a result, for example, when the engine speed is low,
The speed is temporarily changed to the lowest speed via the low speed, and on the other hand, when the speed is high, the speed is temporarily changed to the lowest speed via the high speed. That is,
When the engine speed is low, the gear shift is performed through the low speed stage instead of through the high speed stage where the gear shift time is long, so that the shift shift time of the above control is shortened.

[Embodiment] An embodiment of the present invention shown in FIGS. 3 to 7 will be described below.

In FIG. 3, 10 is an engine and 20 is an automatic transmission. In the automatic transmission 20, hydraulic pressure is controlled by energizing and de-energizing the solenoid valves 21a and 21b to enable 4-speed shifting.

The solenoid valves 21a and 21b are driven by a signal from the control circuit 30, and the control circuit 30 controls the engine 1
0, signals from sensors arranged in various parts of the vehicle including the automatic transmission 20 are input.

These sensors are a throttle opening sensor 14 for detecting the opening of a throttle valve 13 arranged in an intake passage 11 of the engine 10, an idle switch 15 for detecting the full closing of the throttle valve 13, and a rotation speed Ne of the engine 10. Engine speed sensor 16 for detecting the speed, shift lever position sensor 17 for detecting the position of the shift lever, automatic transmission proportional to the vehicle speed
It is composed of a vehicle speed sensor 22 that detects the number of rotations of the output shaft 20c of 20.

The control circuit 30 is composed of a well-known microcomputer, that is, a CPU 31, a RAM 32, a ROM 33, an input port 3
4, output port 35, common bus 36, etc. The signals from the above-described sensors are directly input to the input port 34 via the pulse input sections 36a and 36b. The output port 35 is connected to solenoid valve drive units 38a and 38b. The ROM 33 stores a shift pattern shown in FIG. 7 described later for switching the automatic transmission 20, a control pattern of the present embodiment shown in FIG. 5 described later, and the flow chart shown in FIG. Is remembered.

Next, a control example of the present embodiment will be described based on the flowchart of FIG. First, it is determined whether the vehicle is stopped or at an extremely low speed depending on whether the vehicle speed is less than a predetermined vehicle speed S0 (step 100). That is, when the vehicle is stopped or at an extremely low speed, the shift switching control for preventing the shift shock of the present embodiment is performed. Next, it is determined whether or not the current shift lever position is in the neutral range (N range) (step 110). Therefore, when it is determined that the N range is not currently set, it is determined whether or not the shift stage is controlled to the provisional gear position by determining the set state of the delay flag (step 120). If the delay flag is not set, it is determined in the routine of the previous flow chart that the shift lever position is in the forward range (D range) (step 130). That is,
In steps 100 to 130, it is determined whether or not the shift switching control to the temporary gear position is performed in order to prevent the shift shock. With the above judgment (steps 100-130),
If it is supposed to switch to the temporary gear position,
In the following steps 140 to 200, the provisional gear position is calculated and controlled based on FIG. 5 described later. That is, if the engine speed Ne is equal to or higher than the first speed N1 (step 140), the delay flag is set (step 150). The engine speed Ne is the third speed N3.
(Step 160) and the second rotation speed N2 (step 17
If it is smaller than 0), the provisional gear position is set to the second speed (step 180). On the other hand, when the engine speed Ne is equal to or higher than the second speed N2 (step 170) and is lower than the third speed (step 160), the provisional gear position is set to the third speed (step 190). If the engine speed Ne is equal to or higher than the third speed N3 (step 160), the provisional gear position is set to 4
Speed up (step 200).

Next, control is performed to switch the temporary gear position to the first speed (steps 120, 210 to 230). That is, when it is determined in step 120 that the delay flag is set, the engine speed Ne is the shift speed.
It is determined whether it is less than N1d (step 210). here,
If it is allowed to shift from the provisional gear position to the 1st speed,
That is, when Ne <N1d, the gear is set to the first speed (step 220) and the delay flag is cleared (step 23).
0). The above (steps 100 to 230) is the control for shifting the gear to the provisional gear position (second to fourth) and then shifting to the first gear.

Next, the case where the transition to the temporary gear position is not made will be described (steps 240 to 260). That is, when the current shift lever position is in the N range (step 11
0), the gear is set to the neutral position (step 240). On the other hand, when the shift lever position is switched from the N range to the D range (steps 100 to 130) and the engine speed Ne is less than the first speed N1 (step 14).
0), the shift speed is set to the first speed without passing through the temporary gear position (step 250). On the other hand, when the vehicle is traveling, that is, when the vehicle speed is equal to or higher than the predetermined vehicle speed S0 (step 100),
Alternatively, when the state of the shift lever has not changed from the D range (step 130), the shift control according to the shift pattern of FIG. 7 is performed (step 260). FIG. 7 is a graph for shifting gears based on the relationship between throttle opening and vehicle speed. The solid line in the figure indicates the upshift line (1st gear → 2nd gear, 2nd gear → 3rd gear, 3rd gear → 4th gear),
Dotted lines are downshift lines (4th → 3rd, 3rd → 2nd, 2nd
Speed → first speed). In the graph shown in FIG. 5, the vertical axis represents the shift speed and the horizontal axis represents the engine speed Ne. The horizontal axis indicates the first rotation speed N1, the shift rotation speed N1d, and the second rotation speed N.
2 and the third rotation speed N3 are set. That is, according to the engine speed Ne, 0 ≦ Ne <N1 → 1st speed, N1 ≦ Ne <N2 → 2nd speed, N2 ≦ Ne <N3 → 3rd speed, N3 ≦ Ne → 4th speed, To be The shift speed N1d is set between N1 and N2 in consideration of the delay in the shift change of the automatic transmission 20.

Next, an operation example of this embodiment will be described with reference to the timing chart shown in FIG. In the timing chart,
The vertical axis shows the engine speed Ne, and the horizontal axis shows time.
The timing chart shows the case where the automatic transmission 20 is switched to the first speed through the fourth speed. Time point T1 of the graph
Is the time when the shift lever is switched from the neutral range to the forward range. At the time point T1, it is determined that the engine speed Ne is equal to or higher than the third speed N3, and the control circuit 30 outputs a shift change signal to the automatic transmission 20 to the fourth speed. Time point T2 is a time point when the automatic transmission 20 is switched to the fourth speed. Time point T3 is a time point when the engine speed Ne decreases and becomes less than the transitional speed N1d. The time point T3
Then, the shift change signal for the first speed is output to the automatic transmission 20. Time point T4 is a time point when the engine speed Ne reaches the first speed N1. Time point T5 is a time point when the automatic transmission 20 is shifted to the first speed.

Therefore, as shown in the timing chart of FIG. 6, the engine speed Ne is determined when the shift lever is switched from the neutral range to the forward range. Then, the shift speed corresponding to the engine speed Ne is calculated from the graph of FIG. Then, the automatic transmission 20 is shifted to the calculated shift speed, for example, the fourth speed. After that, when the engine speed Ne becomes less than the shift speed N1d, a shift signal for the first speed is output to the automatic transmission 20. Then, after a slight delay time, the automatic transmission 20 shifts to the first speed.

As a result, the automatic transmission 20 is switched to the first speed through the gear position calculated based on the engine speed Ne. That is, when the engine speed Ne is low, the gear shift is performed through the low speed stage instead of through the high speed stage where the gear shift time is long. Therefore, the low engine speed Ne
At times, the shift change time becomes shorter. As a result, according to the present embodiment, it is possible to provide a control device for an automatic transmission that has a small shift shock and high responsiveness at the time of starting.

The present invention can also be used for control for temporarily preventing the shift shock by increasing the speed ratio of the continuously variable automatic transmission.

[Effects of the Invention] In the present invention, the switching position instructing means F calculates the speed ratio that is temporarily achieved based on the detection value of the engine speed sensor E. Then, the switching position instructing means F instructs the switching means D of the calculated gear ratio. When the shift lever operation detecting means C detects the operation time from the neutral range to the forward range, the switching means D instructed to the speed ratio shifts the speed to the speed ratio calculated by the speed shifting means B. Is temporarily instructed, and then the gear change to the largest gear ratio is instructed. The transmission means B shifts the automatic transmission A to the gear ratio commanded by the switching means D.

Therefore, when the shift lever is operated from the neutral range to the forward range, the automatic transmission A is
The gear ratio is switched to the largest gear ratio through the gear ratio calculated based on the engine speed.

As a result, for example, when the engine speed is low,
Via a temporarily large gear ratio, while if high,
The gear ratio is temporarily switched to the largest gear ratio via the small gear ratio. In other words, if the engine speed is low,
Since the gear shift is performed through a large gear ratio instead of through a small gear ratio with a long gear shift time, the gear shift time of the above control is shortened. Therefore, according to the present invention, it is possible to provide a control device for an automatic transmission, which has less shift shock at the time of starting and has high responsiveness.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a basic configuration of a control device for an automatic transmission of the present invention, and FIG. 2 is a graph showing control characteristics of the present invention.
FIG. 3 is a block diagram showing an embodiment of the present invention, FIG. 4 is a flow chart showing control of the present embodiment, FIG. 5 is a graph showing control characteristics of the present embodiment, and FIG. 6 is a graph showing the control characteristic of the present embodiment. A timing chart, FIG. 7 is a graph showing the shift characteristics of this embodiment. A ... Automatic transmission B ... Transmission means C ... Shift lever operation detection means D ... Switching means E ... Engine speed sensor F ... Switching position indicating means 10 ... Engine 16 ... Engine speed sensor 17 ...... Shift lever position sensor 20 ...... Automatic transmission 30 ...... Control circuit

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. A shift means for shifting the automatic transmission based on speed and load, a shift lever operation detecting means for detecting when the shift lever is operating from a neutral range to a forward range, and a shift lever operation detecting means. Switching means for instructing the gear shifting to the largest gear ratio after instructing the gear shifting means to shift to the gear ratio smaller than the largest gear ratio when the operation of shifting from the neutral range to the forward range is detected. And an engine speed sensor for detecting an engine speed, and a gear ratio instructed to perform a gear change to a gear ratio smaller than the largest gear ratio by the switching means. Based on the value detected by the engine speed sensor, a switching position instruction that gives an instruction to determine the higher gear speed as the engine speed increases Control apparatus for an automatic transmission, characterized in that it comprises a stage, a.