JPH06229462A - Speed change controller of automatic transmission - Google Patents

Abstract

PURPOSE:To enable speed change to be performed at an engine rotational speed suitable for viscosity of oil. CONSTITUTION:An oil temperature signal to be detected by an oil temperature sensor 10 and an engine speed signal to be detected by an engine speed sensor 12 are respectively input into a control unit 18. The engine speed set every oil temperature in speed changing are stored in the control unit 18. The control unit 18 searches the set value of the engine speed corresponding to the detected value of the oil temperature and compares the set value with the detected value of the engine speed, and performs speed change with the detected value is larger than the set value. The control unit 18 continues searching of the engine speed from the start to the end of the speed change and compares the maximum value of the detected value with the maximum value of the previously stored set value, and rewrites the set value in place of a value smaller than that when the detected value is larger than the set value, while rewrites the set value in place of the value larger than that when the detected value is smaller than the set value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift control device for an automatic transmission.

[0002]

2. Description of the Related Art As a conventional shift control device for an automatic transmission, there is the following one. That is, the one disclosed in Japanese Patent Laid-Open No. 62-244726 determines the shift point at the time of upshifting by the engine speed when the valve opening of the throttle valve exceeds a predetermined opening, and at the time of downshifting. It has a shift schedule adjusting means for determining the shift point according to the vehicle speed. Further, the one disclosed in Japanese Patent Application Laid-Open No. 3-41259 compares the engine speed detected at the time of gear shifting with a target engine speed predetermined for gear shifting, and based on the comparison result, There is provided means for changing the shift point of the shift under the same condition from the next time onward so that the engine speed at the time of shifting approaches the target engine speed.

[0003]

However, the conventional shift control device for an automatic transmission described above has the following problems. That is, in the system disclosed in JP-A-62-244726, for example, when the engine speed at the shift point is set in accordance with the case where the oil temperature is sufficiently high (that is, the viscosity of the oil is low), immediately after the start. When the engine speed reaches the set value and the upshift is performed when the oil temperature is low, the viscosity of the oil is high, so that the movement of the engagement element becomes slow. Therefore, the actual engine speed rises to a higher speed than when the oil temperature is high, which causes a problem of engine overrun. In addition, JP-A-3-4125
According to the publication No. 9, the movement of the engagement element becomes faster as the oil temperature rises (that is, the viscosity of the oil decreases) as the vehicle travels, so that the engine speed at the gear shift point becomes gradually lower. . If you stop running when the oil temperature is sufficiently high, and then start running when the oil temperature is sufficiently low, the shift point is set at a low engine speed, so sufficient power performance is obtained. There is a problem that there is no. The present invention is intended to solve such a problem.

[0004]

The present invention solves the above-mentioned problems by setting the engine speed at the time of gear shifting in correspondence with the viscosity of oil. That is, the shift control device for an automatic transmission according to the present invention includes a throttle opening detection means for detecting a throttle opening, a vehicle speed detection means for detecting a vehicle speed,
Based on the engine rotation speed detection means for detecting the engine rotation speed and the throttle opening detected by the throttle opening detection means and the vehicle speed detected by the vehicle speed detection means during normal operation, according to a shift schedule stored in advance. A normal gear shift determining means for making a gear shift determination, and a specific gear shift determining means for making a gear shift determination based on a relationship between a detected value detected by the engine speed detecting means and a set value of the engine speed during upshifting under a specific condition. And a viscosity detecting means for detecting the viscosity of the oil, and an engine rotation speed setting means for presetting a relationship between the viscosity of the oil and the engine rotation speed,
Setting value calculation means for obtaining a setting value of the engine rotation speed corresponding to the relationship between the viscosity of the oil detected by the viscosity detection means and the setting value set in the engine rotation speed setting means. To do. The viscosity detection means is
The viscosity of the oil can be detected by measuring the oil temperature. Further, the engine rotation speed detection means continues to detect the engine rotation speed from the output of the gear shift command signal by the specific gear shift determination means to the end of the gear shift, and the maximum value of the detected value of the engine rotation speed is larger than the maximum value of the set value. In this case, the set value of the engine speed corresponding to the viscosity of the oil at the time of the gear shift command is rewritten to a value smaller than this by a predetermined amount, and if the maximum detected value is smaller than the maximum set value, the gear shift The set value of the engine rotation speed corresponding to the viscosity of the oil at the time of the command can be rewritten to a value that is larger than this by a predetermined amount. The specific condition may be a case of kickdown shift.

[0005]

The oil viscosity and the engine rotation speed are detected, and the set value of the engine rotation speed corresponding to the detected oil viscosity is obtained from the engine rotation speed that is set in advance corresponding to the oil viscosity. Gear shifting is performed based on the relationship between the set value and the detected value. In addition, the engine speed is continuously detected from the output of the gear change command signal to the end of the gear change.If the maximum value is higher than the maximum set value, the set value is rewritten to a smaller value and the maximum detected value is If the set value is smaller than the maximum value, the set value is rewritten to a larger value. As a result, according to the viscosity of the oil, gear shifting can be performed at an engine speed suitable for the viscosity, and sufficient power performance can be obtained.

[0006]

EXAMPLE FIG. 2 shows an example of the present invention. Oil temperature sensor 1
0 (viscosity detecting means) detects an oil temperature signal, engine rotation speed sensor 12 (engine rotation speed detecting means) detects an engine rotation speed signal, and throttle opening sensor 14 (throttle opening detecting means) detects The throttle opening signal and the vehicle speed signal detected by the vehicle speed sensor 16 (vehicle speed detecting means) are respectively controlled by the controller 1
8 is input. During normal operation, the controller 18 controls the automatic transmission 20 according to the shift schedule stored in advance in the controller 18 based on the throttle opening signal from the throttle opening sensor 14 and the vehicle speed signal from the vehicle speed sensor 16. To do. In the shift schedule in this case, each shift point is set according to the relationship between the throttle opening and the vehicle speed. Further, the controller 18 controls in advance based on the oil temperature signal from the oil temperature sensor 10 and the engine rotation speed signal from the engine rotation speed sensor 12 during an upshift under a specific operating condition (for example, a kickdown state). The automatic transmission 20 is controlled according to the relationship stored in the device 18. The relationship in this case is that each shift is executed when the engine rotation speed set for each oil temperature is reached.

FIG. 3 shows a control flow of the controller 18 when shifting from the first speed to the second speed by the engine rotation at the kickdown opening (note that the second speed to the third speed at the kickdown opening). The same is true for gear shifts to). First, the oil temperature signal detected by the oil temperature sensor 10 is read (step 102). Next, the engine rotation speed signal Ne detected by the engine rotation speed sensor 12 is read (step 104). Next, the engine speed NE with respect to the oil temperature read in step 102.
Is searched from the map (step 105). The relationship between the oil temperature and the engine speed NE is preset in the map. That is, the NE is set to increase as the oil temperature increases. Next, NE and Ne are compared (at step 106). If Ne is smaller than NE, the process ends, and if Ne is larger than NE, the first speed to the second speed
A speed change command is issued (108). Next, Ne is continuously detected even after the shift command, and the maximum value Nemax of the Ne is detected (at step 110). Next, Nemax and the target maximum engine speed NEma preset in the memory
x is compared (112). Nemax is NEmax
If it is larger than NE, NE for the oil temperature at the time of shifting is rewritten to a value obtained by subtracting the correction value ΔNE from the NE (Id. 11).
4). If Nemax is smaller than NEmax, NE with respect to the oil temperature at the time of gear shift is rewritten to a value obtained by adding the correction value ΔNE (at 116). After all, according to the control flow, when the actual engine rotation speed Ne reaches the set engine rotation speed NE, 1-2 shift is performed. Since the value of NE is set in advance as described above according to the oil temperature, when the oil temperature is low, gear shifting is performed at a relatively low engine speed, while when the oil temperature is high, the speed is relatively changed. Gear shifting is performed at a high engine speed. Therefore, overrun does not occur when the oil temperature is low, and the shifting vehicle speed is not too low when the oil temperature is high and the power performance is not insufficient. Further, Nemax is modified so as to always match NEmax. As a result, the engine rotation speed during shifting becomes the largest value in the range not exceeding the maximum allowable value NEmax, and sufficient power performance can be obtained. It should be noted that steps 106 and 108 constitute a specific shift determination means. Shifts other than the above shifts are normally performed by the shift determination means based on the throttle opening and the vehicle speed. Further, the map in step 105 constitutes the engine rotation speed setting means, and step 1
05 constitutes a set value calculation means.

[0008]

According to the present invention, since the engine speed is changed in response to the change in the viscosity of the oil at an engine speed suitable for the change, the engine speed does not match the oil viscosity and the engine is overrun. Also, the engine performance at the time of gear shifting will not be too low and power performance will not be insufficient.

[Brief description of drawings]

FIG. 1 is a diagram showing relationships between components of the present invention.

FIG. 2 is a diagram showing an example of the present invention.

FIG. 3 is a control flow of the embodiment.

[Explanation of symbols]

10 Oil Temperature Sensor (Viscosity Detection Means) 12 Engine Rotation Speed Sensor (Engine Rotation Speed Detection Means) 14 Throttle Opening Sensor (Throttle Opening Detection Means) 16 Vehicle Speed Sensor (Vehicle Speed Detection Means)

Claims (4)

[Claims] 1. A throttle opening detection means for detecting a throttle opening, a vehicle speed detection means for detecting a vehicle speed, an engine rotation speed detection means for detecting an engine rotation speed, and a throttle opening detection means during normal operation. Based on the detected throttle opening and the vehicle speed detected by the vehicle speed detection means, a normal gear shift determination means for making a gear shift determination according to a previously stored shift schedule, and an engine speed detection means for an upshift under a specific condition In a shift control device for an automatic transmission having a specific shift determination means that makes a shift determination based on a relationship between a detection value detected by the engine speed and a set value of the engine speed, and a viscosity detection means that detects the viscosity of oil. , Engine speed setting means for setting the relationship between oil viscosity and engine speed in advance, Setting value calculation means for obtaining a setting value of the engine rotation speed corresponding to the relationship between the viscosity of the oil detected by the detection means and the setting value set in the engine rotation speed setting means. Shift control device for automatic transmission. 2. The shift control device for an automatic transmission according to claim 1, wherein the viscosity detecting means detects the viscosity of the oil by measuring the oil temperature. 3. The engine rotation speed detection means continues to detect the engine rotation speed from the output of the gear shift command signal by the specific gear shift determination means to the end of the gear shift, and the maximum value of the detected values of the engine rotation speed is the maximum value of the set values. If it is larger than the above, the set value of the engine speed corresponding to the viscosity of the oil at the time of the gear shift command is rewritten to a value smaller than this by a predetermined amount, and the maximum detected value is smaller than the maximum set value. 3. The shift control device for an automatic transmission according to claim 1, wherein the set value of the engine rotation speed corresponding to the viscosity of the oil at the time of the shift command is rewritten to a value larger than the set value by a predetermined amount. 4. The control device for an automatic transmission according to claim 1, 2 or 3, wherein the specific condition is a kickdown shift.