JPS6223303Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting a gear shift position of a vehicle.

2. Description of the Related Art In recent years, the driving of a vehicle has been electronically controlled with high precision, and the driving status of a vehicle has been displayed for the purpose of economical driving. In these cases, the gear shift position of the transmission is generally detected, but conventionally this detection of the gear shift position has been carried out by mechanical means such as a micro switch installed in the transmission, resulting in a complicated configuration and high cost. This tendency was particularly noticeable when applied to multi-stage transmissions.

The present invention has been devised in view of the conventional situation, and the present invention is designed to simplify the configuration and reduce costs by electronically detecting the gear shift position by detecting the engine rotational speed and vehicle speed. A detection device is provided.

Therefore, the present invention provides an engine rotation speed sensor that detects the engine rotation speed by outputting a pulse in synchronization with the engine rotation, a vehicle speed sensor that detects the vehicle speed by outputting a pulse in synchronization with the vehicle speed, and an engine rotation speed sensor that detects the engine rotation speed by outputting a pulse in synchronization with the vehicle speed. The number of pulses output from the vehicle speed sensor is counted for each generation period of pulses output from the rotation speed sensor via a frequency divider, and the count value is within a set range at the gear shift position of the transmission. and an electronic detection circuit that detects that the gear shift position is in question when the value belongs to , and detects that the gear shift position is in the neutral position when the value is other than that.

The present invention will be described below with reference to the illustrated embodiment.

A signal disk having teeth formed on the outer periphery is connected to the crankshaft of an engine (not shown), and a signal disk such as a pick-up that generates a pulse each time each tooth passes, that is, in synchronization with the engine rotation, is installed close to the teeth of the disk. An engine rotation speed sensor 1 is provided. The output pulse from the engine speed sensor 1 is input to an amplifier 2 where it is amplified, passed through a Schmitt circuit 3, modified into a rectangular pulse, and then input to a frequency divider 4. The frequency divider 4 outputs one pulse every time the rectangular pulse is inputted a predetermined number of times N, and after inputting the pulse to the differentiating circuit 5 and modifying it into a narrow pulse, the function described below is performed. Counter circuit 6 with
and the data latch circuit 7.

On the other hand, a vehicle speed sensor 8 is provided which detects the vehicle speed and outputs a number of pulses proportional to the vehicle speed in synchronization with the vehicle speed.The output pulses from the vehicle speed sensor 8 are amplified by the amplifier 9 as described above, and are amplified by the Schmitt circuit 10. After correcting the shape of the pulse, it is input to the counter circuit 6.

When the counter circuit 6 inputs the pulse from the differentiating circuit 5, the Schmitt circuit 10
This is counted every time a pulse is input from . When a new pulse is input from the differentiation circuit 5, the count value during this period is sent to the data latch circuit 7, and the counter circuit 6 itself is reset to count the number of pulses newly input from the Schmitt circuit 10. start.

The data latch circuit 7 continues the count value inputted from the counter circuit 6 at the same time as the pulse is inputted from the differentiating circuit 5, and stores and holds this until a new pulse is inputted from the differentiating circuit 5. The count value signal is input to a plurality of magnitude comparators 11a to 11l.

The magnitude comparators 11a to 11l have set values (A ₁ to A ₁₂ , however, A ₁
<A ₂ <…<A ₁₂ ) corresponding depth switch 12
A to 12l are input as reference values.

A comparator into which the lower limit value at each gear shift position is input compares the lower limit value with the count value input from the data latch circuit 7, and turns on when the latter exceeds the former, and turns off otherwise.
The output signal for the corresponding gear shift position is
AND circuits 13a to 13f are input, and on the other hand, a comparator inputting the upper limit value compares the upper limit value with the count value and outputs an output signal that turns ON when the latter is lower than the former and turns OFF otherwise, for the corresponding gear shift position. are input to the AND circuits 13a to 13f.

The outputs of each AND circuit 13a to 13f are directly and
It is input to a gear shift position display circuit (not shown) via the NOR circuit 14, and the AND circuits 13a to 13
When any of the outputs of f is turned on, the corresponding gear shift position is displayed, and when the NOR circuit 14 is turned on, the neutral position is displayed.

That is, at the same gear shift position other than the neutral position, the engine rotation speed and vehicle speed are approximately proportional, so the count value falls within a set range depending on the gear shift position, and therefore, for example, when the gear shift position is 1st gear. In this case, A ₁ <B < A ₂ , and the AND circuit 13a for 1st speed turns ON, and the display circuit displays that the speed is 1st. As the gear ratio increases, the count value increases, and at gear shift positions other than the neutral position, any of the AND circuits 13a to 13f from 1st to 6th gears is turned ON, and the corresponding gear shift position is displayed. In the neutral position, the NOR circuit 14 is turned on and this is displayed.

In this way, the transmission shift position is detected electronically by detecting the engine rotation speed and vehicle speed, so it is low cost and reliable without complicating the structure of the transmission unlike mechanical means. A highly sensitive detection function can be obtained, which is particularly advantageous when applied to a multi-speed transmission.

FIG. 2 shows another embodiment of the invention. In this device as well, the pulses from the engine speed sensor 1 are inputted to the counter circuit 6 and the data latch circuit 7 via the amplifier 2, the Schmitt circuit 3, the frequency divider 4, and the differential circuit 5, and the pulses from the vehicle speed sensor 8 are inputted to the counter circuit 6 and the data latch circuit 7. The input to the counter circuit 6 via the amplifier 9 and the Schmitt circuit 10 is the same as in the previous embodiment, but the count value output from the data latch circuit 7 is input to the ROM (data storage device) 21.

The ROM 21 stores the gear shift position at an address corresponding to the lower limit to the upper limit of the count value at each gear shift position from 1st to 6th gear, and when the count value from the data latch circuit 7 is input, the corresponding gear shift position is stored. If the gear shift position corresponding to the count value is one of the first to sixth speeds, the corresponding address is selected, and the output from the address causes the gear shift position to be displayed via the display circuit. Also, the output from each address is
It is also input to the NOR circuit 22, and if the gear shift position corresponding to the count value does not correspond to any of the 1st to 6th speeds, the NOR circuit 22 turns ON and displays that it is the neutral position via the display circuit. be done.

In addition, when using the magnitude comparator as in the first embodiment, by changing the settings of the dip switch, etc., or when using the ROM as in the second embodiment, the ROM It is possible to easily deal with many types of transmissions by replacing the .

Further, in the above embodiments, the gear shift position is detected and displayed via the display circuit, but the present invention can also be applied to a system in which the detection signal is guided to, for example, an engine operation control means to perform operation control by detecting the shift position. Of course you can do that.

Further, by adding the shift position detecting device according to the present invention to the conventional shift position detecting device using a micro switch, it can be used as a fail-safe means in the event of a micro switch failure, and safety can be further improved.

As explained above, the present invention includes an engine rotation speed sensor that detects the engine rotation speed by outputting a pulse in synchronization with the engine rotation, and a vehicle speed sensor that detects the vehicle speed by outputting a pulse in synchronization with the vehicle speed. The number of pulses output from the vehicle speed sensor is counted for each generation period of pulses output from the sensor and the engine rotational speed sensor via a frequency divider, and the count value is calculated at each gear shift position of the transmission. Equipped with an electronic detection circuit that detects that the gear shift position is in question when it falls within one of the setting ranges, and detects that it is in the neutral position when the value is outside the range, the shift position is determined based on the engine rotational speed. Since it is configured to electronically detect the speed and vehicle speed, it is more compact and has excellent stability compared to the case where the transmission is equipped with complicated mechanical means such as a micro switch.
Moreover, it is advantageous in terms of cost, and has various other features such as being able to be used as fail-safe means by being added to conventional detection devices such as microswitches.

[Brief explanation of the drawing]

Fig. 1 is a block circuit diagram showing one embodiment of the invention, Fig. 2A is a block circuit diagram showing another embodiment of the invention, and Fig. 2B is a block circuit diagram used in the above embodiment.
FIG. 3 is a diagram showing a storage processing system of a ROM. DESCRIPTION OF SYMBOLS 1... Engine rotation speed sensor, 2, 9... Amplifier, 3, 10... Schmidt circuit, 4... Frequency divider, 5... Differential circuit, 6... Counter circuit, 7...
...Data latch circuit, 8...Vehicle speed sensor, 11a
~11l...Magnitude comparator, 12
a~12l...Deep switch, 13a~13
f...AND circuit, 14...NOR circuit, 21...
ROM, 22...NOR circuit.

Claims (1)

[Scope of utility model registration request] An engine rotation speed sensor that detects the engine rotation speed by outputting a pulse in synchronization with the engine rotation, a vehicle speed sensor that detects the vehicle speed by outputting a pulse in synchronization with the vehicle speed, and a frequency division from the engine rotation speed sensor. The number of pulses output from the vehicle speed sensor is counted for each generation period of pulses output through the device, and when the count value belongs to any of the set ranges at each gear shift position of the transmission, the gear shift is performed. 1. A gear shift position detection device for a vehicle, comprising: an electronic detection circuit that detects that the position is at the neutral position; and an electronic detection circuit that detects that the neutral position is at any other value.