JP2002206628A - Gear shift position detector of multi-stage transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear shift position detector of a multi-stage transmission capable of detecting the disengaged state of a gear separately from the breakage of wiring. SOLUTION: A resistance R0 for detecting a gear disengagement is installed parallel with resistances R1 to R6 for detecting gear shift positions. An output terminal P11 connected to contacts P1 to P6 for detecting the gear shift positions through the resistances R1 to R6 for detecting gear shift positions is always earthed through the resistance R0 for detecting the gear disengagement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift position detecting device for a multi-speed transmission used for a motorcycle or the like.

[0002]

2. Description of the Related Art In general, a motorcycle or the like is provided with a multi-stage transmission, and the power of the engine is transmitted to the rear wheels via the multi-stage transmission. are doing. Such a multi-stage transmission is provided with a shift position detecting device.

For example, as shown in FIGS. 10 and 11, in a multi-stage transmission 1, a gear shift cam 4 is rotatably supported by a crankcase 3 of an engine 2, and the gear shift cam 4 is rotated by a predetermined angle to perform a plurality of shift operations. The gear shift operation for changing gears is performed.

A shift position detecting circuit 6 for detecting a shift position of the multi-stage transmission 1 includes a gear position switch 7, an energizing contact G, and an engine control unit 8. The engine case 3 is always grounded via an engine ground T1.
Is always grounded via the ground T2.

[0005] The gear position switch 7 is mounted on the engine case 3 so as to face the end face of the gear shift cam 4. Shift position detecting contacts P1 to P corresponding to a plurality of shift gears of the multi-stage transmission 1 are provided on the end surface of the gear position switch 7 (the surface facing the gear shift cam 4).
6 are arranged side by side in an arc shape. As shown in FIGS. 11 and 12, the shift position detecting contacts P1 to P6 are connected to the engine control unit 8 via resistors R1 to R6 having different resistance values. Specifically, each of the shift position detecting contacts P1 to P6 is connected to one output terminal P in parallel via shift position detecting resistors R1 to R6.
The output terminal P11 is connected to the engine control unit 8.

A neutral position detecting contact PNT is provided on the end face of the gear position switch 7 (opposing surface of the gear shift cam 4) together with the plurality of shift position detecting contacts P1 to P6. The contact PNT is directly connected to the engine control unit 8. Also, the contact P for neutral position detection
The NT is connected to a power supply 9 via a neutral lamp 10.

The energizing contact G is removably fitted via a coil spring 11 in a mounting hole 4a provided at an end (end face) of the gear shift cam 4. (The gear shift cam 4
Opposing surface). Since the energizing contact G is constantly urged in the projecting direction by the coil spring 11, when the gear shift cam 4 is rotated by a predetermined angle to perform a gear shift, a shift position or a neutral position is selected according to the rotational position. As a result, any one of the plurality of shift position detecting contacts P1 to P6 or the neutral position detecting contact PNT is elastically contacted. Then, by grounding one of the shift position detecting contacts P1 to P6 or the neutral position detecting contact PNT,
A signal is output to engine control unit 8.

The shift position detecting contacts P1 to P
6 or the neutral position detecting contact PNT is brought into contact with the energizing contact G by the rotation of the gear shift cam 4, so that the signals (gear position output) from the shift position detecting contacts P1 to P6 are output from the engine control unit 8. A signal (neutral output) from a neutral position detecting contact PNT is input to a neutral position input terminal U2 to a gear position signal input terminal U1.

Here, the shift position detecting contacts P1 to P6
Is connected to the engine control unit 8 via the resistors R1 to R6 having different resistance values, the output value (gear position output) to the input terminal U1 of the engine control unit 8 differs depending on the shift position. It is possible to detect which shift position is selected according to the value. Further, since the neutral position detecting contact PNT is connected to the engine control unit 8 without using a resistor, when the neutral position is selected, it is clearly distinguished from the case where any one of the shift positions is selected. Is done.

[0010] As prior art relating to the shift position detecting device of the multi-stage transmission, Japanese Utility Model Laid-Open No. 2-107867 and Japanese Patent Laid-Open No. 11-59217 are cited.

[0011]

In such a shift position detecting device, as shown in FIGS. 11 and 13, the current-carrying contact G on the gear shift cam 4 is connected to any one of the shift positions of the gear position switch 7. Detection contacts P1 to P
6 and the neutral position detection contact PNT are not in contact with the engine ground T1.
As a result, the output from the gear position switch 7 is in the same state as when the wire connecting the position switch 7 and the engine control unit 8 is broken, and the gear is disconnected and the wire is disconnected. And cannot be clearly distinguished. Therefore, when the failure detection for the detection device is detected by the disconnection of the wiring, if the state shown in FIG. The unit 8 determines that the wiring is broken,
False detection.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shift position detecting device for a multi-stage transmission capable of detecting a so-called gear disengagement state in distinction from disconnection of wiring.

[0013]

According to a first aspect of the present invention, there is provided an end face of the gear shift cam corresponding to the gear shift cam and the transmission gear of a multi-stage transmission for switching a plurality of transmission gears by rotating the gear shift cam by a predetermined angle. A plurality of shift position detecting contacts arranged in an arc shape so as to face each other; and contacting any one of the plurality of shift position detecting contacts provided on an end face of the gear shift cam by rotation of the gear shift cam. A multi-stage transmission comprising: an energizing contact for grounding the shift position detecting contact; and one output terminal connected to each of the shift position detecting contacts via a shift position detecting resistor having a different resistance value. In the shift position detecting device of the machine, a gear missing detection resistor is provided in parallel with the shift position detecting resistor, and the output terminal is always grounded via the gear missing detecting resistor. Is shall.

According to the first aspect of the present invention, since the output terminal is always grounded via the gear disconnection resistor, the energizing contact comes into contact with any one of the shift position detecting contacts and the gear change is normally performed. In this case, the shift position detecting contact is grounded via the energizing contact, and as a result, the output terminal is a combined resistance of the shift position detecting resistor and the gear disengagement resistor corresponding to the shift position detecting contact. To be grounded. On the other hand, in the case of the gear missing state, the shift position detecting contact is not grounded via the energizing contact, so that the output terminal is grounded only via the gear missing resistance. Further, in the case of the disconnection state, the output terminal is not grounded, so that it is clearly distinguished from the case of the gear disconnection state.

According to a second aspect of the present invention, the output terminal is electrically connected to a control unit for controlling an engine, and the control unit receives a signal from the output terminal and is in a shift state. A shift determining means for determining whether the gear is out of gear or in a failure state may be provided.

With this configuration, the shift determining means of the control unit, which has received the signal from the output terminal, determines, according to the signal, whether the transmission is in a gearshift state, a gear loss state, or a failure state. Is determined.

In this case, the shift determining means is electrically linked to a gear-in assist control means, and the gear-in assist control means assists the gear-in when the gear is in a disengaged state. The engine can be controlled in a direction.

In this way, when the gear is out of gear, the gear-in auxiliary control means stops the ignition, corrects the ignition timing (retards or advances the ignition timing), and corrects the fuel injection amount (the fuel injection amount). Gear-in assist control (eg, increase or decrease) is performed, the engine is controlled in a direction to assist gear-in, and gear change is smoothly performed.

According to a fourth aspect of the present invention, the shift determining means is electrically linked to a shift position fixing means, and the shift position fixing means is forcibly forced to a specific shift position when a failure occurs. Can be fixed in place.

With this arrangement, when a failure occurs,
A fixed traveling performance is ensured by being forcibly fixed to a specific shifting position by the shifting position fixing means. Therefore, it is possible to move to, for example, a gas station for repairing a malfunction.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. Note that the basic configuration of a shift position detecting device for a multi-stage transmission according to the present invention described below is the same as that shown in FIGS. 10 to 13 described above, and therefore, the same components are denoted by the same reference numerals. The description is omitted.

FIG. 1 is a circuit diagram of a shift position detecting device for a multi-speed transmission according to the present invention, and FIG. 2 is an explanatory diagram showing a gear position switch according to the present invention.

As shown in FIGS. 1 and 2, in the shift position detecting device for a multi-stage transmission according to the present invention, one end is connected to the output terminal P11 and the other end is connected to each shift position detecting contact point P1 to P1.
Shift position detecting resistor R1 connected to P6
A gear missing detection resistor R0 is provided in parallel with R6. One end of the gear release resistance R0 also has an output terminal P11.
, But the other end is always grounded through an engine ground T1. Thus, the gear position switch 7A according to the present invention is configured.

Therefore, as shown in FIG. 13, when the gear shift cam 4 is rotated, the energizing contact G is changed to any one of the shift position detecting contacts P1 to P6 and the neutral position detecting contact P.
Even if it does not come into contact with NT, the output terminal P11 (input terminal U1 of the gear position signal) is grounded via the gear loss detection resistor R0.

For this reason, it is possible to clearly distinguish between a gear loss state and a failure state in which the wire connecting the gear position switch 7A and the engine control unit 8A is broken. Erroneous detection is eliminated. In addition, since it can be distinguished from each shift position, it is also possible to make the ignition timing and the like a special control (for example, gear disengagement control).

Further, for example, as shown in FIG. 10, the energizing contact G is at a regular position where it comes into contact with any one of the shift position detecting contacts (in FIG. 10, the shift position detecting contact P2). Since the output terminal P11 is grounded via a combined resistance of the gear loss detection resistor and the resistors R1 to R6 corresponding to each shift position, the output terminals P11 are connected to the resistors R1 to R6 corresponding to each shift position. , The shift position is detected without difficulty as in the prior art. Note that the detection of the neutral position is performed in the same manner as in the related art.

The engine control unit 8A
Has a shift determining means 8a which receives a signal from the output terminal P11 and determines whether a shift state, a gear loss state, or a failure state is present. The shift determination means 8a is electrically linked to a gear-in assist control means 8b, and the gear-in assist control means 8b controls the engine in a direction to assist gear-in when a gear is out. Further, the shift determining means 8b
Is electrically connected to the shift position fixing means 8c, and the shift position fixing means 8c is forcibly fixed to a specific shift position when a failure occurs.

Next, the specific control of the engine control unit 8A will be described. <Gear Position Detection Control> As shown in FIG. 1 and FIG. 3, when starting with a gear change or the like, first, the shift determination means 8a determines what the signal GP from the gear position switch 7A is. Is performed (step S1). That is, it is in a failure state in which no signal is input, or the shift position detecting contacts P1 to P6 (first speed position to
It is determined whether the input of the signal from the sixth speed position) is in a normal gear control state in which a signal is input, or in a neutral state other than those, or in a gear missing state.

If the signal GP from the gear position switch 7A is a signal from the shift position detecting contacts P1 to P6, it is determined that normal gear control is being performed (step S2), and the routine returns.

If there is a signal input, but the signal is not a signal from the contacts P1 to P6 and is not in a fault condition such as disconnection or short circuit, first, the neutral position detection contact PNT It is determined whether the signal is from (neutral position) (step S3). If the signal is from the neutral position detection contact point PNT, normal neutral control is executed (step S).
4) On the other hand, if the return is not a signal from the neutral position detection contact PNT, it is considered that the gear is missing, so the gear removal control shown in FIG. 4 is executed (step S5), and the process returns. Here, it is determined whether the gear is in the missing state or the neutral state by checking the output terminal P11.
Is grounded via a resistor R0 or grounded without a resistor.

On the other hand, in the case of a fault condition such as a disconnection or a short circuit, a fault diagnosis process shown in FIG. 9 is executed (step S6), and the routine returns. <Gear Missing Control> As shown in FIG. 4, first, gear missing detection is performed (step S11).
The gear-in assist control means 8b executes the gear-in assist control (step S12), and returns to the normal control (step S13). Then, based on the input from the gear position switch 7A, it is detected whether or not the gear is missing (step S14).
On the other hand, if the gear loss has been eliminated and the gear-in has been completed, the normal state is restored and there is no need to perform the gear loss control, and the process is terminated without performing the gear loss control. Here, whether or not the gear is missing is determined based on whether or not the output terminal P11 (the input terminal U1 of the engine control unit 8) is grounded only through the resistor R0.

As the gear-in auxiliary control, as will be described later, it is conceivable to stop ignition, correct ignition timing, stop fuel injection, and the like. <Failure Diagnosis Processing> As shown in FIGS. 1 and 5, a failure is detected (step S21), the shift position (for example, the sixth speed position) is fixed by the shift position fixing means 8c, and a failure warning lamp (shown in FIG. 1). Is turned on (step S22), and the failure diagnosis process ends.

Next, what can be considered as control by the gear-in auxiliary control means 8b will be described. <Gear-in auxiliary control (1)> As shown in FIGS. 4 and 6, when the gear-in auxiliary control is started after the gear is disengaged, the ignition is stopped n times in order to perform the gear-in smoothly when performing a gear change. (Step S3
1), the gear-in assist control ends.

Therefore, for example, after the ignition is stopped n times and the control is returned to the normal control, it is detected whether or not the gear-in has been performed (step S13). If the gear-in has not been performed yet, the operation is repeated again. <Gear-in auxiliary control (2)> As shown in FIG. 7, when the gear-in auxiliary control is started after a gear dropout occurs,
When performing a gear change, the ignition timing is corrected to smoothly perform the gear-in (step S41), and the gear-in assist control ends. <Gear-in auxiliary control (3)> As shown in FIG.
When performing a gear change, the fuel injection is stopped only n times (step S51) to smoothly perform the gear-in (step S51).
The gear-in assist control ends. <Gear-in auxiliary control (4)> As shown in FIG.
When a gear change is performed, the ignition timing is corrected and the fuel injection amount is corrected in order to smoothly perform the gear-in (step S61), and the gear-in assist control ends.

[0035]

The present invention is embodied as described above, and has the following effects.

According to the first aspect of the present invention, an output terminal connected to each shift position detecting contact via a shift position detecting resistor is provided.
By providing a gear slippage detection resistor in parallel with the shift position detection resistor, the gear slippage detection resistor is always grounded, so that the output terminal is only a gear slippage resistance when the gear slippage occurs. Grounded through and also
In the case of the disconnection state, the grounding is not performed, so that the disconnected state of the gear and the disconnection state can be clearly distinguished.

According to a second aspect of the present invention, based on a signal from the output terminal, the shift determining means of the control unit determines whether a shift state, a gear loss state, or a failure state has occurred. By doing so, it is possible to easily detect which shift position (or neutral position), gear missing state, or failure.

According to a third aspect of the present invention, when the shift determining means is linked to a gear-in assist control means for controlling the engine in a direction for assisting gear-in when the gear is out of gear, the shift-in determining means is provided. Sometimes ignition stops,
Gear assist control such as correction of ignition timing and correction of fuel injection amount can be performed so that gear changes can be smoothly performed.

According to a fourth aspect of the present invention, if the shift determining means is linked to a shift position fixing means for forcibly fixing the shift position to a specific shift position in a failure state, even if a failure occurs, By fixing the gear at a predetermined shift position, it is possible to secure a certain traveling performance and to move to, for example, a gas station for repairing a malfunction.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a shift position detecting device for a multi-speed transmission according to the present invention.

FIG. 2 is an explanatory diagram showing a gear position switch according to the present invention.

FIG. 3 is a flowchart of gear position detection control according to the present invention.

FIG. 4 is a flowchart of gear disengagement control according to the present invention.

FIG. 5 is a flowchart of a failure diagnosis process according to the present invention.

FIG. 6 is a flowchart illustrating a first example of the gear-in assist control according to the present invention.

FIG. 7 is a flowchart illustrating a second example of the gear-in assist control according to the present invention.

FIG. 8 is a flowchart illustrating a third example of the gear-in assist control according to the present invention.

FIG. 9 is a flowchart illustrating a fourth example of the gear-in assist control according to the present invention.

FIG. 10 is a sectional view showing a conventional shift position detecting device of a multi-stage transmission.

FIG. 11 is an explanatory view showing the gear position switch of FIG. 10;

FIG. 12 is a circuit diagram of a conventional shift position detecting device for a multi-stage transmission.

FIG. 13 is a view similar to FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 multi-stage transmission 4 gear shift cam 6 shift position detection circuit 7A gear position switch 8A engine control unit 8a shift determination means 8b gear-in auxiliary control means 8c shift position fixing means R1 to R6 shift position detection resistance R0 gear slippage detection resistance PNT neutral Contact for position detection P1 to P6 Contact for shift position detection P11 Output terminal G Contact for energization T1 Engine ground T2 Ground

Claims (4)

[Claims] 1. A gear shift cam and a plurality of gears of a multi-stage transmission that switches a plurality of gears by rotating the gear shift cam by a predetermined angle and are arranged in a circular arc so as to face an end face of the gear shift cam. A plurality of shift position detecting contacts provided on an end face of the gear shift cam, and contacting any one of the plurality of shift position detecting contacts by rotation of the gear shift cam to ground the shift position detecting contact. A shift position detecting device for a multi-stage transmission, comprising: a current-carrying contact, and one output terminal connected to each of the shift-position detecting contacts via a shift-position detecting resistor having a different resistance value. A gear shift detection resistor is provided in parallel with the detection resistor, and the output terminal is always grounded via the gear shift detection resistor. Fast position detection device. 2. The output terminal is electrically connected to a control unit that controls an engine. The control unit receives a signal from the output terminal, and determines whether the transmission is in a gearshift state or a gear loss state. 2. The shift position detecting device for a multi-stage transmission according to claim 1, further comprising a shift determining means for determining whether or not there is a failure. 3. The shift-in determining means is electrically linked to a gear-in assist control means, and the gear-in assist control means controls the engine in a direction to assist gear-in when a gear is out. Item 3. A shift position detecting device for a multi-stage transmission according to Item 2. 4. The shift determining means is electrically linked to a shift position fixing means, and the shift position fixing means forcibly fixes a specific shift position in a failure state. 4. The shift position detecting device for a multi-stage transmission according to 2 or 3.