JPH01242855A - Shift position detecting device for automatic transmission - Google Patents

Abstract

PURPOSE:To discriminate each range of P and R by installing a range judging means which receives a signal from an inhibitor switch and a position detecting switch and outputs different signals into a warning part when a shift lever is in a P or R range. CONSTITUTION:An ON-signal which is outputted from an inhibitor switch 2 when a shift lever is in P or N range and an ON-signal which is outputted from a position detecting switch 3 when the shift lever is at the R range or the contiguous range position are inputted into a range judging means 6. In the range judging means 6, a logic circuit is arranged, and different two kinds of signals and outputted into a warning part 5 in the P or R range on the basis of the ON/OFF-signals which are sent from the inhibitor switch 3 and the position detecting switch 3. In the warning part 5, each different warning is generated in the P and R ranges on the basis of the above-described signals.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shift position detection device for an automatic transmission installed in a vehicle such as an automobile, and is capable of providing different warnings in P range and R range. The present invention relates to a shift position detection device for an automatic transmission.

[Conventional technology]

Vehicles equipped with automatic transmissions are equipped with various safety devices to prevent troubles caused by erroneous operations due to driver carelessness or the like. For example, Japanese Patent Application Laid-open No. 56-57539 states that if the driver opens the door to get out of the car without returning the shift lever to the P range or moving the shift lever to the N range and applying the brakes, an alarm is issued. It describes a safety device for vehicles with automatic transmissions that emits a This is to prevent trouble from occurring by notifying the driver that in the above case, the car may start to move on a slope or the like. By always placing the shift lever in the P range when the vehicle is stopped, it is possible to prevent the engine from running out of control when starting the engine, which is becoming increasingly important for safety reasons.In addition, in the P range, the tow truck Since you cannot move your car without it, it can also prevent theft.

[Problem to be solved by the invention]

By the way, since the R range is located relatively close to the N range, there is a possibility that the driver may think that the shift lever is in the N or D range while driving, but instead end up in the R range. Otherwise, trouble will occur. Therefore, for safety reasons, it is desirable to provide a means for issuing a warning, such as issuing an alarm not only when the shift lever is in the P range but also when the shift lever is in the R range. Furthermore, since the selection conditions for the P range and the R range are completely different, it is desirable that a warning be provided in some way to distinguish between the two.

The present invention has been made in consideration of these circumstances, and provides a shift position detection device for an automatic transmission that issues different warnings when the shift lever enters the P range and when the shift lever enters the R range. It is intended to.

[Means to solve the problem]

In order to solve the above object, the present invention provides a shift position warning system that warns a driver when the shift lever of an automatic transmission is in P range or R range. An inhibitor switch that outputs an on signal when the shift lever is in the N range, and a position detection switch that outputs an on signal when the shift lever is in the R range and its adjacent range positions are provided. A range determining means is provided which receives the signal and outputs different signals to the warning section when the shift lever is in the P range and when the shift lever is in the R range.

[For production]

The on signal output from the inhibitor switch when the shift lever is in the P range or the N range, and the on signal output from the position detection switch when the shift lever is in the R range or its adjacent range positions are used to determine the range. input into the means. The range determining means is provided with, for example, a logic circuit, and determines whether the P
In the range or the R range, two different signals are output to the warning section. The warning section generates different warnings in the P range and R range based on the signal.

〔Effect of the invention〕

The shift position detection device for an automatic transmission of the present invention includes an inhibitor switch that outputs an on signal when the shift lever is in the P range or the N range, and an inhibitor switch that outputs an on signal when the shift lever is in the R range or an adjacent range position. A position detection switch that outputs a signal is provided, and the shift lever receives the signals from the above inhibitor switch and position detection switch.
Since it is equipped with a range determination means that outputs different signals to the warning section when the shift lever is in the P range and when it is in the R range, Different warnings can be given at different times.

〔Example〕

The present invention will be explained in detail below based on examples.

The shift position detection device for an automatic transmission according to the present invention is configured to issue different warnings to the driver when the shift lever is in the P range or the R range, and is configured as follows.

As shown in FIGS. 2 and 3, shift lever 1 is
An inhibitor switch 2 that outputs an on signal when the shift lever 1 is in the P range or the N range, and a zone detection switch 3 that is a position detection switch that outputs an on signal when the shift lever 1 is in the P range or the R range are connected to the transaxle. It is attached on top of 4. As shown in FIG. 1, upon receiving signals from the inhibitor switch 2 and the zone detection switch 3, it is determined whether the shift lever 1 is in the P range or the R range, and a different signal is sent to the warning section. A range determining means 6 is provided which outputs an output to the range determining means 5. In response to the signal, the warning section 5 generates a first warning when the shift lever 1 is in the P range, and a second warning different from the first warning when the shift lever 1 is in the R range, so that the driver can clearly distinguish between the two. It is possible to distinguish.

As shown in FIG. 3, the inhibitor switch 3 operates in conjunction with the manual shaft 7 in the transaxle 4, and when the shift position is in the P range or N range, and 2. The configuration is such that an on signal is output when lunging. To explain its structure, the tip of an arm 9 which is fastened and fixed to the upper end of the manual shaft 7 with a nut 8 is operatively connected to the shift lever 1 via a control cable 10.

One end of a rotating contact 11 of the inhibitor switch 2 as shown in FIG. 4 is fixed to the manual shaft 7, and a contact (not shown) is formed protruding from the lower part of the other end of the rotating contact 11. The manual shaft 7 rotates about the axis 7a of the manual shaft 7 on a fan-shaped base plate 12 fixed to the switch body. On the other hand, the R range position and position on the base plate 12, 2. Fixed contacts 13 and 14 that come into contact with the above-mentioned contacts are attached to the lunge positions, and D, 2. A terminal voltage of approximately 12 V is generated when in range, and approximately 0.5 V when in P or N range. In this example, as described above, the ON signals for the P range and N range are input to the range determining means 6.

The zone detection switch 3 is configured in substantially the same manner as the inhibitor switch 2, and a rotating contact 15 fixed to the manual shaft 7 and rotating around its axis 7a is positioned on a fan-shaped base plate 16 at the P range position. When a fixed contact 17 attached across the R range position is contacted, an on signal is output.

The range determining means 6 is composed of a logic circuit as shown in FIG. That is, the on/off signal from the inhibitor switch 2 is input to the A terminal of the first AND circuit 18 that outputs the signal S1 for the first warning to the warning section 5, and is also input to the A terminal of the first AND circuit 18 for outputting the signal S1 for the second warning via the NOT circuit 19. D of the NAND circuit 20 that outputs the signal S2 for
input to the terminal. On the other hand, an on/off signal from the zone detection switch 3 is inputted to the B terminal of the first AND circuit 18 and also inputted to the E terminal of the second AND circuit 20.

The operation of the range determining means 6 constituted by such a circuit will be explained below.

+11 When the shaft lever 1 is in the P range, the ON signal is output from both the inhibitor switch 2 and the zone detection switch 3, the ON signal is input to the A terminal and B terminal of the first AND circuit 18, and the C terminal A signal S1 for the first warning is outputted to the warning section 5 from.

On the other hand, the NOT circuit 19 is connected to the D terminal of the NAND circuit 20.
Since the inverted OFF signal is input to the E terminal and the ON signal is input to the E terminal, the signal S2 for the second warning is not output from the F terminal.

(2) When the shaft lever 1 is in the R range, the inhibitor switch 2 outputs an OFF signal, the zone detection switch 3 outputs an ON signal, and the A terminal of the first AND circuit 18 outputs an OFF signal, a B An on signal is input to the terminal, and a signal for the first warning is not output to Sl.

On the other hand, the NOT circuit 19 is connected to the D terminal of the NAND circuit 20.
Since the ON signal inverted at is inputted to the E terminal and the ON signal is inputted to the E terminal, the signal S2 for the second warning is outputted from the F terminal.

(3) When the shift lever 1 is in the N range, the ON signal is sent from the inhibitor switch 2 to the zone detection switch 3.
An off signal is output from the first AND circuit 18, an on signal is input to the A terminal of the first AND circuit 18, and an off signal is input to the B terminal.
No signal St is output from the C terminal. On the other hand, since the off signal is input to the D terminal and the E#i child of the N-AND circuit 20, the signal S2 is not output from the F terminal.

In this way, without changing the function and structure of the already provided inhibitor switch 2,
By stacking and compactly arranging single zone detection switches formed in approximately the same shape, it is possible to perform two types of warnings that can clearly distinguish whether the shift position is in the P range or the N range. It becomes possible.

6 and 7 show different embodiments in which the fixed contact 22 in the zone detection switch 21 is connected to the base plate 2.
The range determining means 24 inputs the on/off signal sent from the zone detection switch 21 to the B terminal of the first AND circuit 18 via the knot circuit 25. ing. With this configuration, the rotary contact 11 of the inhibitor switch 2 fixed to the manual shaft 7 is connected to the shift lever 1 via the fairly long control cable 10, and corresponds to the rotary contact 11 of the shift lever 1. Since the P range and R range positions are close to each other on the base plate 12, it is possible to avoid confusion in distinguishing between the P range and the R range, which sometimes occurs.

In other words, without particularly improving the detection accuracy of the P and R ranges in the inhibitor switch 2, the detection accuracy of the zone detection switch 21 with a simple structure in which the conduction state is completely opposite to that of the inhibitor switch 2 in the P and R ranges can be improved. By improving this, it becomes possible to more clearly distinguish between the P range and the R range. That is, for example,
Even if a conduction state occurs where the rotating contact 11 straddles the P range and the R range in the inhibitor switch 2,
The rotating contact 15 of the zone detection switch 21 is the fixed contact 22
Unless it makes contact with , it is determined that it is in the P range. Therefore, by appropriately adjusting the R range detection position of the zone detection switch 21 and improving the detection accuracy, the above-described structural defects of the inhibitor switch 2 can be compensated for.

Note that the present invention does not specify the configuration or arrangement position of the position detection switch, and the position detection switch only needs to be able to output an on signal when the shift lever is in the R range and its adjacent range positions. It may be provided near the.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of main parts of an embodiment of the shift position detection device for an automatic transmission of the present invention, Fig. 2 is a perspective view of the shift lever, and Fig. 3 shows an inhibitor switch and a zone detection switch attached to a transaxle. FIG. 4 is an exploded perspective view of the inhibitor switch and zone detection switch, FIG. 5 is a circuit diagram of the range determination means, and FIG. 6 is an exploded perspective view of the zone detection switch in a different embodiment. , FIG. 7 is a circuit diagram of a range determining means in a different embodiment. 1- Shift lever 12- Inhibitor switch, 3...
-Position detection switch (zone detection switch), 5-Warning section, 6.24- Range determination means. Patent applicant: Mazda Corporation Agent: Patent attorney: Katsutoshi Yoshiso (and one other person) Figure 3 Figure 4 Figure 6

Claims (1)

[Claims] (1) In a shift position warning system that warns the driver when the shift lever of an automatic transmission is in the P or R range, an on signal is output when the shift lever is in the P or N range. and a position detection switch that outputs an on signal when the shift lever is in the R range or an adjacent range position. 1. A shift position detection device for an automatic transmission, comprising range determination means for outputting different signals to a warning section when the shift position is in the R range and when the shift position is in the R range.