JPS6344990B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to an automatic transmission for an automobile. In particular, the present invention relates to a control device for an automatic transmission that prevents unnecessary upshifts.

[Description of Prior Art] Conventionally, in this type of automatic transmission, if the rotation speed of the engine is increased by increasing the amount of depression of the accelerator pedal at a certain rate, as the vehicle speed increases, the automatic transmission will shift up and accelerate again. If you press less on the accelerator pedal, the gear will shift up at a lower vehicle speed.

For this reason, when the driver takes his foot off the accelerator pedal and tries to press the brake pedal, such as when turning a corner on flat ground, the automatic transmission shifts up and the vehicle speed increases. Also, if you release the accelerator pedal when approaching a curve, such as an uphill curve, the automatic transmission will shift up and the vehicle speed will increase around the curve. Even when I tried to accelerate, the gear position was shifted up, resulting in weak engine power and the hassle of having to manually shift down again.

The inventor of the present invention has completed the present invention by paying attention to the fact that the above-mentioned driving problem occurs when the accelerator pedal is suddenly released and the steering wheel is turned.

[Purpose of the invention]

The present invention solves the above-mentioned problems of automatic transmissions, and provides a control device for automatic transmissions that does not cause unnecessary shift-up against the driver's will at turns on flat ground, curves on uphill slopes, etc. With the goal.

[Features of the invention]

The present invention provides an automatic transmission equipped with a shift actuator that automatically changes the gear position according to changes in the engine speed and engine load of the vehicle, in which the return speed of the accelerator pedal of the vehicle is electrically controlled. a return speed detection circuit that detects the signal as a signal; a comparison circuit that sends out an output signal when the output signal level of the detection circuit is greater than a predetermined signal level; and a rotation angle detector that detects as an electrical signal, and is configured to prohibit operation of the shift actuator when an output signal appears in the comparison circuit or the rotation angle detector to prevent unnecessary shift-up. It is characterized by

Incidentally, individual differences among drivers can also be standardized by variably setting the predetermined signal level of the comparison circuit.

[Explanation based on examples]

An explanation will be given below based on the drawings of the embodiment.

FIG. 1 is a block diagram of a control device according to an embodiment of the present invention. In Fig. 1, 1 is a rotation sensor that detects the rotational speed of the engine as an electrical signal, 2 is a shift sensor that detects the gear position of the transmission as an electrical signal, and 3 is a load sensor that detects the engine load as an electrical signal. It is. These sensors 1-3
The output of is connected to a control circuit 4 including a microcomputer. The output of this control circuit 4 is connected to a shift actuator 6 via a normally closed actuator switch 5.

7 is an accelerator pedal, and the amount of rotational displacement of the rotating rod of this accelerator pedal 7 is guided to a return speed detection circuit 8 of the accelerator pedal 7. This return speed detection circuit 8 is composed of a potentiometer 9, a differentiation circuit 10, and a diode 11. The amount of rotational displacement of the rotating rod is given to this potentiometer 9. The output of this potentiometer 9 is passed through a differentiating circuit 10 to a diode 1.
1, and the output of this diode 11 is connected to the comparison input of the comparison circuit 12. A predetermined reference voltage Es is introduced to the reference input of this comparison circuit 12.

Also, 14 is a handle, and this handle 1
The steering device No. 4 is provided with a switch circuit 15 that closes an electric circuit when the steering rotation angle is equal to or greater than a predetermined angle. The output of this switch circuit 15 is connected to the input of an OR circuit 16 together with the output of the comparison circuit 12.
The output of is connected to the control input of the actuator switch 5.

In a control device having such a configuration, when the driver suddenly releases the accelerator pedal 8 at a turn on a flat road or an uphill curve, the output voltage of the potentiometer 9 changes rapidly. The output signal of the potentiometer 9 is differentiated by a differentiating circuit 10 and output as the displacement speed of the accelerator pedal 7. diode 1
1 extracts only the return speed from this displacement speed and supplies it to the comparison input of the comparison circuit 12. If the signal level of this electrical signal is greater than the reference voltage Es,
An output signal appears in the comparison circuit 12. Further, when the driver turns the steering wheel 14 at a turn on a flat road or an uphill curve to increase the steering rotation angle to a predetermined angle or more, the switch circuit 15 is closed and an output signal appears. When an output signal appears in the comparator circuit 12 or the switch circuit 15, the OR circuit 16 becomes high level and opens the actuator switch 5, which had been closed.

As a result, the operation of the shift actuator 6, which conventionally performed a shift-up operation, is prohibited, and the vehicle can be driven smoothly around corners on flat ground, curves on uphill slopes, and the like.

FIG. 2 is a block diagram of a control device according to another embodiment of the present invention. In FIG. 2, each symbol corresponds to each symbol in FIG. 1, respectively. A characteristic feature of the device of this embodiment is that the reference voltage Es of the comparator circuit 12 can be variably set by a variable resistor 17.

This allows the variable resistor 17 to be adjusted even if the way the accelerator pedal 8 is returned differs depending on individual differences when driving around a bend on flat ground or uphill, or when driving faster than the normal return speed depending on the driving situation. You can respond flexibly by changing the value.

Note that the return speed detection circuit 8 shown in the above example is not limited to the above example, and a circuit that differentiates the output of an accelerator pedal position sensor used in an automatic transmission, etc. may be used.

Further, although a switch circuit is shown as an example of the steering rotation angle detector, other electrical means such as a position sensor of the steering device may be used.

〔Effect of the invention〕

As described above, according to the present invention, the operation of the shift actuator is controlled when the return speed of the accelerator pedal is above a certain speed, or when the steering wheel is turned and the steering rotation angle is above a certain angle. By configuring this to prohibit the driver from turning the steering wheel after loosening the accelerator pedal, or when turning the steering wheel and then loosening the accelerator pedal, or when the driver turns the steering wheel after turning the steering wheel, or when turning the steering wheel after turning the steering wheel, or when turning the steering wheel after turning the steering wheel, or when turning the steering wheel after turning the steering wheel or turning the accelerator pedal. Even when the accelerator pedal is turned off and the accelerator pedal is released at the same time, unnecessary upshifting against the driver's will can be prevented, and there is an excellent effect that the automatic transmission-equipped automobile can run smoothly.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a control device according to an embodiment of the present invention. FIG. 2 is a configuration diagram of a control device according to another embodiment of the present invention. 1... Rotation sensor, 2... Shift sensor, 3...
...load sensor, 4...control circuit, 5...actuator switch, 6...shift actuator,
7... Accelerator pedal, 8... Return speed detection circuit, 9... Potentiometer, 10... Differential circuit, 11... Diode, 12... Comparison circuit, 1
4... Handle, 15... Switch circuit (rotation angle detector), 16... OR circuit, 17... Variable resistor.

Claims (1)

[Scope of Claims] 1. In an automatic transmission equipped with a shift actuator that automatically changes the gear position according to changes in the rotational speed of the engine of the vehicle and the engine load, a return speed detection circuit that detects speed as an electrical signal; a comparison circuit that sends out an output signal when the output signal level of this detection circuit is greater than a predetermined signal level; a rotation angle detector that detects a certain state as an electrical signal, and configured to prohibit operation of the shift actuator when an output signal appears in the comparison circuit or the rotation angle detector. Control device. 2. The automatic transmission control device according to claim 1, which is configured to be able to variably set the predetermined signal level of the comparison circuit.