JP4518677B2 - Multi-speed transmission shift position detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shift position detecting device for a multi-stage transmission used in a motorcycle or the like.
[0002]
[Prior art]
In general, motorcycles and the like are provided with a multi-stage transmission, and the power of the engine is transmitted to the rear wheels via the multi-stage transmission, and the speed is increased or decreased by switching the transmission gear. Such a multi-stage transmission is provided with a shift position detecting device.
[0003]
For example, as shown in FIGS. 10 and 11, in the 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 switch a plurality of transmission gears. A gear shift operation is performed.
[0004]
The shift position detection circuit 6 that detects the 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 the engine ground T1, and the engine control unit 8 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 detection contacts P <b> 1 to P <b> 6 corresponding to a plurality of transmission gears of the multi-stage transmission 1 are arranged in an arc on the end surface of the gear position switch 7 (the surface facing the gear shift cam 4). 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 detection contacts P1 to P6 is connected in parallel to one output terminal P11 via shift position detection resistors R1 to R6, and this output terminal P11 is connected to the engine control unit 8. Has been.
[0006]
Further, a neutral position detection contact PNT is provided on the end face of the gear position switch 7 (opposite surface of the gear shift cam 4) together with the plurality of shift position detection contacts P1 to P6, and this neutral position detection contact PNT. Is directly connected to the engine control unit 8. The neutral position detecting contact PNT is connected to the power source 9 via a neutral lamp 10.
[0007]
Further, the energizing contact G is fitted and inserted into a mounting hole 4a provided at an end (end face) of the gear shift cam 4 via a coil spring 11, so that the end face (gear shift of the gear shift switch 7) is inserted. Opposing surface of the cam 4. Since the energizing contact G is always urged in the protruding direction by the coil spring 11, when the gear shift cam 4 is rotated by a predetermined angle and a gear shift is performed, a shift position or a neutral position is selected according to the rotation position. Thus, any one of the plurality of shift position detecting contacts P1 to P6 or the neutral position detecting contact PNT is elastically contacted. A signal is output to the engine control unit 8 by grounding any one of the shift position detecting contacts P1 to P6 or the neutral position detecting contact PNT.
[0008]
When the gear shift cam 4 is brought into contact with the shift position detection contacts P1 to P6 or the neutral position detection contact PNT by rotation of the gear shift cam 4, signals from the shift position detection contacts P1 to P6 ( Gear position output) is input to the gear position signal input terminal U1 of the engine control unit 8, and a signal (neutral output) from the neutral position detection contact PNT is input to the neutral signal input terminal U2.
[0009]
Here, since 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, the output value to the input terminal U1 of the engine control unit 8 depending on the shift position. Since (gear position output) is different, it is possible to detect which shift position is selected according to the output value. Further, since the neutral position detecting contact PNT is connected to the engine control unit 8 without a resistor, when the neutral position is selected, it is clearly distinguished from when any one of the shift positions is selected. Is done.
[0010]
Examples of prior art relating to the shift position detecting device for a multi-stage transmission include Japanese Utility Model Laid-Open No. 2-107867 and Japanese Patent Laid-Open No. 11-59217.
[0011]
[Problems to be solved by the invention]
By the way, in such a shift position detecting device, as shown in FIGS. 11 and 13, the energizing contact G on the gear shift cam 4 side is connected to any of the shift position detecting contacts P1 to P6 of the gear position switch 7 and the neutral position. In a so-called gear disengagement state where the detection contact PNT is not touched, the engine is not grounded to the engine ground T1 or the like. Therefore, the output from the gear position switch 7 is transmitted between the position switch 7 and the engine control unit 8. It becomes the same state that the disconnection has occurred in the wiring to be connected, and it is not possible to clearly distinguish the disconnected state and the disconnected state. Therefore, when the failure detection for the detection device is detected by the disconnection of the wiring, when the state as shown in FIG. The unit 8 determines that the wiring is disconnected and erroneously detects it.
[0012]
An object of the present invention is to provide a shift position detecting device for a multi-stage transmission that can detect a so-called gear disengagement state as distinguished from disconnection of wiring.
[0013]
[Means for Solving the Problems]
According to the first aspect of the present invention, the gear shift cam and the gear shift cam that corresponds to the transmission gear of the multi-stage transmission that switches a plurality of transmission gears by rotating the gear shift cam by a predetermined angle are arranged in an arc shape so as to face the end face of the gear shift cam. A plurality of shift position detecting contacts provided, and 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, and the shift position detecting contact thereof In the shift position detecting device for a multi-stage transmission, comprising: an energizing contact for grounding the output; 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 loss detection resistor is provided in parallel with the shift position detection resistor, and the output terminal is always grounded via the gear loss detection resistor.
[0014]
According to the first aspect of the present invention, since the output terminal is always grounded via the gear disconnection resistance, the energizing contact contacts 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 energization contact, and as a result, the output terminal is connected via a combined resistance of the shift position detecting resistor and the gear missing resistor corresponding to the shift position detecting contact. It will be grounded. On the other hand, in the gear disengaged state, the shift position detecting contact is not grounded via the energizing contact, so that the output terminal is grounded only via the gear disengagement resistor. In the case of a disconnection state, the output terminal is not grounded, so that it is clearly distinguished from the case of a gear disengagement state.
[0015]
The output terminal is electrically linked to a control unit that controls the engine, and the control unit receives a signal from the output terminal and is in a shift state or in a gear disengaged state. Or a shift determining means for determining whether the vehicle is in a failure state.
[0016]
In this way, the shift determination means of the control unit that has received the signal from the output terminal determines whether the gear is in the gear shift state, the gear disengaged state, or the failure state according to the signal. The
[0017]
In this case, as described in claim 3, the shift determination means is electrically linked to the gear-in auxiliary control means, and the gear-in auxiliary control means is configured to assist the gear-in when the gear is out. Can be controlled.
[0018]
In this way, when the gear is disengaged, the gear-in auxiliary control means stops the ignition, corrects the ignition timing (retards or advances the ignition timing), corrects the fuel injection amount (increases the fuel injection amount or Gear-in assist control such as (decrease) is performed, the engine is controlled in the direction to assist gear-in, and the gear change is performed smoothly.
[0019]
According to a fourth aspect of the present invention, the shift determination means is electrically linked to a shift position fixing means, and the shift position fixing means is forcibly fixed at a specific shift position in a failure state. Can be.
[0020]
In this way, in the case of a failure, the shift position fixing means forcibly fixes the specific shift position to ensure a certain traveling performance. Therefore, it is possible to move to a gas station, for example, for repairing a failure.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. Since the basic configuration of the 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, the same components are denoted by the same reference numerals. The description is omitted.
[0022]
FIG. 1 is a circuit diagram of a shift position detecting device for a multi-stage transmission according to the present invention, and FIG. 2 is an explanatory view showing a gear position switch according to the present invention.
[0023]
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 side is connected to the output terminal P11 and the other end side is connected to each shift position detecting contact P1 to P6. A gear loss detection resistor R0 is provided in parallel with the shift position detection resistors R1 to R6. The gear disconnection resistor R0 is also connected to the output terminal P11 at one end, but is always grounded through the engine ground T1 at the other end. Thus, the gear position switch 7A according to the present invention is configured.
[0024]
Therefore, as shown in FIG. 13, even if the gear shift cam 4 is rotated and the energizing contact G is not in contact with any of the shift position detecting contacts P1 to P6 or the neutral position detecting contact PNT, The output terminal P11 (the gear position signal input terminal U1) is grounded via the gear loss detection resistor R0.
[0025]
Therefore, it is possible to clearly distinguish the gear disengaged state from the failure state in which the connection between the gear position switch 7A and the engine control unit 8A is broken, and the gear disengaged state is erroneously detected as a failure. Nothing will happen. Further, since it can be distinguished from each shift position, it is also possible to make the ignition timing etc. special control (for example, gear disengagement control).
[0026]
Further, for example, as shown in FIG. 10, when the contact point G for energization is at a normal position where it is in contact with one of the shift position detection contacts (the shift position detection contact point P2 in FIG. 10), 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 the respective shift positions, the resistors R1 to R6 corresponding to the respective shift positions are made different. In this case, the shift position is detected without difficulty as in the prior art. Note that the neutral position is also detected in the same manner as before.
[0027]
The engine control unit 8A includes a shift determination means 8a that receives a signal from the output terminal P11 and determines whether the gear is in a gear shift state, a gear disengaged state, or a failure state. The shift determination means 8a is electrically linked to the gear-in auxiliary control means 8b, and the gear-in auxiliary control means 8b controls the engine in a direction to assist the gear-in when the gear is disengaged. The shift determination means 8b is electrically linked to a shift position fixing means 8c, and the shift position fixing means 8c is forcibly fixed at a specific shift position in a failure state. .
[0028]
Next, specific control of the engine control unit 8A will be described.
<Gear position detection control>
As shown in FIGS. 1 and 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 (step S1). . That is, it is a failure state in which no signal is input, or a normal gear control state in which a signal is input from the shift position detection contacts P1 to P6 (first speed position to sixth speed position), or It is determined whether a neutral state other than the above or a gear disengaged state.
[0029]
When 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 the gear control is normal (step S2), and the process returns.
[0030]
If there is a signal input, but the signal is not a signal from the contacts P1 to P6, and is not in a broken or short-circuited failure state, first, the neutral position detecting contact PNT (neutral position) ) Is determined (step S3). If the signal is from the neutral position detection contact PNT, normal neutral control is executed (step S4), and the process returns. If the signal is not from the neutral position detection contact PNT, the gear is disengaged. Since it is considered, the gear loss control shown in FIG. 4 is executed (step S5), and the process returns. Here, it is determined whether the gear is in the gear-out state or the neutral state depending on whether the output terminal P11 is grounded via the resistor R0 or not via the resistor.
[0031]
On the other hand, in the case of a failure state that is a disconnection or a short circuit, the failure diagnosis process shown in FIG.
<Gear disconnection control>
As shown in FIG. 4, first, gear loss detection is performed (step S11), and in accordance with the detection result, the gear-in auxiliary control means 8b executes gear-in auxiliary control (step S12), and the normal control is resumed. Returning is performed (step S13). Then, it is detected from the input from the gear position switch 7A whether or not the gear is missing (step S14). If the gear missing is not eliminated, the processes of steps S12 and S13 are performed until the gear missing is eliminated. On the other hand, if the gear omission is eliminated and the gear-in is completed, it is not necessary to perform the gear omission control by returning to the normal state, so the process is terminated without performing the gear omission control. Here, whether or not the gear is disengaged is determined by whether or not the output terminal P11 (the input terminal U1 of the engine control unit 8) is grounded only through the resistor R0.
[0032]
As the gear-in assist control, as will be described later, it is conceivable to stop ignition, correct the ignition timing, stop fuel injection, and the like.
<Fault diagnosis processing>
As shown in FIGS. 1 and 5, failure detection is performed (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 (not shown) is turned on. (Step S22), the failure diagnosis process is terminated.
[0033]
Subsequently, 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 assist control is started after the gear loss occurs, the ignition is stopped n times (step S31) to smoothly perform the gear-in when the gear change is performed. Control ends.
[0034]
Therefore, for example, after stopping ignition n times and returning to normal control, it is detected whether or not a gear-in has been made (step S13), and if the gear-in has not yet been performed, the process is repeated again.
<Gear-in auxiliary control (2)>
As shown in FIG. 7, when the gear-in assist control starts after the gear loss occurs, the ignition timing is corrected (step S41) in order to smoothly perform the gear-in when the gear change is performed, and the gear-in assist control ends. .
<Gear-in auxiliary control (3)>
As shown in FIG. 8, when the gear-in assist control starts after the gear loss occurs, the fuel injection is stopped n times (step S51) in order to smoothly perform the gear-in when the gear change is performed. Ends.
<Gear-in auxiliary control (4)>
As shown in FIG. 9, when the gear-in assist control is started after the gear loss occurs, the ignition timing is corrected and the fuel injection amount is corrected in order to smoothly perform the gear-in when the gear is changed (step S61). Then, the gear-in auxiliary control ends.
[0035]
【The invention's effect】
The present invention is implemented as described above, and has the following effects.
[0036]
According to the first aspect of the present invention, an output terminal connected to each shift position detection contact through a shift position detection resistor is provided with a gear drop detection resistor in parallel with the shift position detection resistor. Since the detection resistor is always grounded, the output terminal is grounded only through the gear disconnection resistance when the gear is disengaged, and is not grounded when it is disconnected. The state and the disconnection state can be clearly distinguished.
[0037]
According to a second aspect of the present invention, the shift determination means of the control unit determines whether a shift state, a gear disengagement state, or a failure state is made based on a signal from the output terminal. Then, it is possible to easily detect which speed change position (or neutral position), gear disengaged state, or failure.
[0038]
According to a third aspect of the present invention, the shift determining means is linked to a gear-in auxiliary control means for controlling the engine in a direction of assisting the gear-in when the gear is disengaged. Gear auxiliary control such as stopping the ignition, correcting the ignition timing, and correcting the fuel injection amount can be performed so that the gear change can be performed smoothly.
[0039]
According to a fourth aspect of the present invention, if the shift determination means is linked to a shift position fixing means that forcibly fixes the shift determination means to a specific shift position in a failure state, even if a malfunction occurs, By fixing at the shift position, it is possible to ensure a certain running performance and to move to a gas station, for example, for repairing a failure.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a shift position detecting device for a multi-stage transmission according to the present invention.
FIG. 2 is an explanatory view 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 failure diagnosis processing according to the present invention.
FIG. 6 is a flowchart showing a first example of gear-in assist control according to the present invention.
FIG. 7 is a flowchart showing a second example of gear-in assist control according to the present invention.
FIG. 8 is a flowchart showing a third example of gear-in assist control according to the present invention.
FIG. 9 is a flowchart showing a fourth example of gear-in assist control according to the present invention.
FIG. 10 is a cross-sectional view showing a conventional shift position detecting device for a multi-stage transmission.
FIG. 11 is an explanatory diagram 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.
13 is a view similar to FIG. 10 showing a gear disengagement state. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Multi-speed 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-R6 Shift position detection resistance R0 Gear missing detection resistance PNT Neutral Position detecting contacts P1 to P6 Shifting position detecting contact P11 Output terminal G Contact for energization T1 Engine ground T2 Ground

Claims (4)

A gear shift cam and a plurality of shift positions arranged in parallel in an arc shape so as to face the end face of the gear shift cam corresponding to the shift gear of a multi-stage transmission that switches a plurality of shift gears by rotating the gear shift cam by a predetermined angle. A contact for detection, and an energization contact provided on an end face of the gear shift cam for contacting one of the plurality of shift position detection contacts by rotation of the gear shift cam and grounding the shift position detection contact In the shift position detecting device for a multi-stage transmission, each shift position detecting contact includes one output terminal connected via a shift position detecting resistor having a different resistance value.
A gear drop detection resistor is provided in parallel with the shift position detection resistor,
The shift position detecting device for a multi-stage transmission, wherein the output terminal is always grounded through the gear missing detection resistor. The output terminal is electrically linked to a control unit that controls the engine,
2. The multi-stage according to claim 1, wherein the control unit includes a shift determination means that receives a signal from the output terminal and determines whether the gear is in a gear shift state, a gear disengaged state, or a failure state. A shift position detecting device for a transmission. The multi-stage according to claim 2, wherein the shift determination means is electrically linked to a gear-in auxiliary control means, and the gear-in auxiliary control means controls the engine in a direction of assisting gear-in when the gear is out of gear. A shift position detecting device for a transmission. 4. The shift determination means is electrically linked to a shift position fixing means, and the shift position fixing means is forcibly fixed to a specific shift position in a failure state. A shift position detecting device for a multi-stage transmission.

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