JPS6010219B2 - Complete automation device for gear type transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a finite gear train to determine the relationship between the vehicle speed, the amount of accelerator pedal depression, and the engine rotation speed in a vehicle that uses the power of an internal combustion engine. The present invention relates to a fully automated device (electronic circuit) for a gear type transmission that automatically calculates the desired driving state of the vehicle.

Various types of automatic gear shift control devices have been proposed, but it is important to calculate the shift point that matches the vehicle's driving state and the driver's desired driving state, adjust the shift point, and adjust the hysteresis of the previous and next gears during gear shifting. Adjustment inside was almost impossible.

The present invention aims to solve the above-mentioned problems, and will be explained below with reference to the drawings. In FIG. 1, which shows the calculation concept of the speedometer, this electronic calculation circuit selects the speed change mode selected by the driver, that is, the mode M. which changes speed when the engine reaches maximum horsepower. Based on the relationship between the following three quantities: mode M2 in which the gears are shifted during economical horsepower when the fuel consumption rate is minimum, the accelerator depression amount u (accelerator depression amount in the case of mode M, ground), and the vehicle speed a. Shift point (far from the vehicle where gear shifting operations are performed)
Calculate.

First, after selecting whether to set the shift mode to M or G, the target engine rotational speed is calculated for each accelerator depression amount u. is calculated (the leftmost diagram in Figure 1). Next, for this target engine speed, 0] of the ratio of 8 to the distance of the vehicle (for example, the number of revolutions of the propeller shaft). is calculated, and the target ideal gear ratio y is calculated (center diagram in Figure 1). Finally, the continuous variable gear ratio is converted by a window-type comparator with hysteresis into a stepped actual gear ratio y* (y~y) corresponding to the gear ratio of the gears of the actual vehicle. This method determines a shift point that matches the driver's desired shift mode and the vehicle's running conditions.
This will be explained with reference to the embodiment shown in FIG. [11
The circuit elements for setting the target gear ratio y are a variable resistor 2 (resistance value Ru) that is linked to the accelerator pedal, a mode select switch 6 that selects either maximum output or economical output mode, and a resistor that provides each mode. 4 (resistance value Ro,) and 5 (resistance value Ro2).

In the figure, 1 is the input terminal with voltage corresponding to the car remote saw, 3
is an output terminal from which a voltage corresponding to the target speed ratio y is taken out. Resistor 4 or resistor 5 is determined by the mode selection, and according to the circuit shown in the figure, the gear ratio y is y={-1/(10 Ru/
R. , } is given by J. Ru, Roi (i=1,
The specific value for 2) is the number of revolutions when the engine is idling. It is set by examining the engine characteristics corresponding to the accelerator depression amount u' in each mode. ■ Operation of the gear shift point detection relay 2 The continuous gear ratio y calculated by the circuit in Figure 2 is converted into a finite discontinuous (step-like) gear ratio y* (the rightmost diagram in Figure 1) that fits the actual vehicle. ), the circuit shown in FIG. 3 is used.

This circuit consists of a well-known Schmitt trigger circuit X with hysteresis, a window-type comparator circuit X2 consisting of logic elements, and a transmission operation relay corresponding to the actual gear ratio y* (which generally plays the role of a shift lever in a transmission). It is composed of an operating current amplification circuit X3 (Miyakomura) that performs the following functions. There are 3 gear shift point settings for the X4. The circuit shown in FIG. 3 will be explained below. When the gear ratio y is shifted from o to y ice...... y ice, the variable resistors 7, 8, 9, and 10 used in the gear shift point setting circuit X4 in Fig. By 3 in the work,
When the vehicle is stationary, the output of the OBE amplifier 11 is 1, and the output of the other OBE amplifiers is also 1 (the Schmitt trigger circuit is 4).
(because all outputs are 1).

Now consider the case where a car starts from a stationary state.

40, that is, the output 1 of the amplifier 11 in the top column circuit in Figure 3.
passes through the logic NAND circuit 19 and the NAND circuit 26, and its output, ie, W.

becomes 1, and by the action of the current amplification circuit of transistors 30 and 31, relay 38 corresponding to the first lotus is operated.
The operation of the relay 38 specifically operates the transmission (described later)
. When an operating signal is given to the relay 38, considering an amplifier other than the obeamp 11, for example, the amplifier 12, the output of the amplifier 12 is 1, and the input of the NAND circuit 20 is the output of the amplifiers 12, 13, 14 and the amplifier 1. NAND from 1
(NAND circuit 2
Inputs to 0 are 0, 1, 1, 1).

Therefore, the output of the NAND circuit 20 is 1, the output of the NAND circuit 27 is 0, that is, the output W is 0, and in the same way, the outputs W2 and W3 are both 0, and the second, third, and fourth speeds are The corresponding devices 39, 40, and 41 do not work. Next, as the vehicle speed increases, the input voltage y of the Schmitt trigger circuit
・When the output of the amplifier 11, which was 1 until now, becomes 0, the corresponding NAND circuit 19,
26, the first application relay 38 is turned off, and N
Since the input side of the AND circuit 20 is input through the NAND circuit 23, the output of the NAND circuit 27 is 1,
Therefore, the second application relay 39 operates.

That is, at the time of starting, the outputs of the amplifiers are all 1, and after the relay 38 for 1st gear turns ○N, as the vehicle distance increases, the output of the amplifier 11 becomes 0, and as the relay 38 turns OFF, the relay 38 for 2nd gear relay 39 is turned on.

Furthermore, as the number of vehicles increases, the output of the amplifier 12 becomes 0, the second long distance relay 39 is turned OFF, and the relay 40 is turned ON.
In this way, the gears are sequentially shifted to higher speed stages.
The actual speed change stages (1st to 4th far) and logic circuit values are shown in the following table, and the location of "1" in the table ultimately indicates the relay operating point.

It is preferable that the hysteresis widths A, B, and C during upshifting and downshifting shown in FIG. 1 be as narrow as possible as long as chattering does not occur. , 17, and 18.

3} Example of Shift Control FIG. 4 shows the relationship between the throttle function u (accelerator depression amount), the engine speed, and the vehicle speed in an example of the automatic shift performed by the method described above.

For example, if the economical horsepower upshift (mode M2) is selected and the throttle is depressed 100%, the gear change indicated by the thick solid line arrow in the graph on the right side of FIG. 4 is performed. The thin solid arrow indicates the characteristic during town shift. Figure 5 is a graph showing the specific relationship between the throttle, vehicle distance, and shifting points.
The test vehicle is M old 4 female, engine is Button BI type, 8550c
c, 16 tsubo S/230pm, 57.0k9m/140
This is the enemy PM. The broken line in the figure shows the maximum horsepower shift (mode M).
, ). (Effect of the invention) A variable resistor for detecting a gear ratio that divides the voltage corresponding to the vehicle distance in a type of automobile that transmits the power of an internal combustion engine to the drive wheels via a clutch and a stepped gear type transmission. 2 is provided, and the variable resistor 2 for gear ratio detection is driven in accordance with the amount of accelerator pedal depression, and the maximum horsepower mode divides the pre-select gear ratio as a voltage obtained by the variable resistor 2 for gear ratio detection. M.I.
Two types of resistors 4 and 5, one for economical horsepower mode and one for economical horsepower mode M2, are provided via a select switch 6, and Schmitt trigger circuits XI are provided as many as the number corresponding to the gears to input the gear ratio y as a trigger voltage after selection as a voltage. Voltage dividing variable resistors 7, 8, 9, 10 are connected to each Schmitt trigger circuit
Each Schmitt trigger circuit is provided corresponding to I.
Variable resistors 15, 16, 17, and 18 for generating hysteresis are provided between the output side of 1 and the comparison voltage input side, respectively, and the corresponding transmission gear relays 38, 39 receive the output from each Schmitt trigger circuit x 1. , 40, and 41 are provided, so: [a-- A variable resistor 2 for detecting the gear ratio that divides the voltage corresponding to the vehicle distance is provided, and the variable resistor 2 for detecting the gear ratio is pressed when the accelerator is pressed. Since the drive is made to correspond to the amount, the gear ratio y can be calculated extremely easily with a simple configuration.

[b- Two types of resistors 4 and 5 for maximum horsepower mode and economic horsepower mode are provided via a select switch 6 to divide the pre-select gear ratio as a voltage obtained by the variable resistor 2 for gear ratio detection. Therefore, the mode can be easily switched to either the maximum horsepower mode MI or the economical horsepower mode M2, which suits the driving condition desired by the driver, and the mode switching circuit is extremely simple. 'c- Since variable resistors 7, 8, 9, and 10 for trigger voltage division are provided corresponding to each Schmitt trigger circuit XI,
The Schmitt trigger voltage can now be easily adjusted,
It becomes possible to easily change and adjust the shift point of each gear stage. {d- Variable resistor 15 for hysteresis generation between the output side of each Schmitt trigger circuit x 1 and the comparison voltage input side
, 16, 17, and 18, it becomes possible to easily adjust the width of hysteresis between the previous stage and the next stage during gear shifting, and it becomes easier to deal with the chattering phenomenon during gear shifting. (The circuit after calculating the gear ratio y changes depending on the number of gears, but the circuit up to calculating the gear ratio y is extremely simple regardless of the number of gears, and is highly reliable and durable. Are better.

[Brief explanation of drawings]

Figure 1 is a diagram showing the method for setting the actual gear ratio, Figure 2 is a circuit diagram for calculating the target gear ratio, and Figure 3 is a circuit for converting a continuous gear ratio into a discontinuous actual gear ratio. 4 is a graph showing the shift point detection characteristics, and FIG. 5 is a graph showing an example corresponding to FIG. 4. X,... Schmitt trigger circuit, X2... window type comparator circuit, X3... current amplifier circuit for relay operation, X4... shift point setting circuit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In an automobile of the type in which the power of an internal combustion engine is transmitted to the drive wheels via a clutch and a stepped gear type transmission, a variable resistor 2 for detecting a gear ratio that divides a voltage corresponding to the vehicle speed is installed, and the gear ratio is changed. The variable resistor 2 for ratio detection is driven in accordance with the amount of accelerator pedal depression, and the variable resistor 2 for gear ratio detection is
Two types of resistors 4 and 5 for maximum horsepower mode M1 and economic horsepower mode M2 are provided via a select switch 6 to divide the pre-select gear ratio as a voltage, and the post-select gear ratio γ as a voltage is The number of Schmitt trigger circuits X1 that inputs as a trigger voltage is provided in a number corresponding to the gear speed, and variable resistors 7, 8, 9, and 10 for trigger voltage division are provided corresponding to each Schmitt trigger circuit X1, and the output of each Schmitt trigger circuit X1 is Variable resistors 15, 16, 17, 1 for hysteresis generation are connected between the side and the comparison voltage input side.
8 are respectively provided, and corresponding transmission gear relays 38, 39, 4 receive the output from each Schmitt trigger circuit X1.
A complete automation device for a gear type transmission, characterized in that it is provided with a logic circuit X2 for driving 0 and 41.