Motorcycle start-enabling device

Abstract: A start-enabling device for a motorcycle engine comprises a frame, a starter motor for said engine, a member for transmitting the power generated by said engine to a wheel, a clutch located on said member, a movable element (6) for manually operating said clutch arranged to set this latter in at least two working positions, namely an idle position and a motion engagement position, a motorcycle side support element (5) movable between two working positions, namely a retracted position and an extended position in which it supports the vehicle, engine start control means (1), and means (3, 4) for sensing the position of the clutch operating element (6) relative to a fixed vehicle part with which it is associated, and for sensing the position of the side support element (5) relative to the frame. The sensor means (3, 4) are proximity sensor means comprising two mutually cooperating spaced-apart portions (3A, 3B; 4A, 4B), a first portion (3A, 4A) being associated with a fixed vehicle part (13, 8) and the second (3B, 4B) being associated with the movable element (5, 6).

Description: This invention relates to a device in accordance with the introduction to the main claim. As is well known, motorcycles (in particular medium-high power motorcycles) use devices enabling the engine starter motor to be activated and the engine to be fired only when certain parts of the vehicle are in particular working positions, and specifically the position of the side support element and of the clutch lever. One of these known devices is disclosed in US-A-4638880 These known devices use mechanical switches which are moved into a particular (closed) position by the movement of the side support element. When in this position, said switches close an electrical circuit to enable the starter motor to be activated and particular conditions to be attained (for example engine powering) enabling the engine to be fired and to be maintained in the operating state. These known devices have however various drawbacks connected mainly with the use of traditional mechanical switches. In this respect, these switches have a limited life, are negatively affected by the vibration generated during vehicle use, are affected by moisture and can be damaged by water infiltration into the switch body. These problems can result in malfunction of such switches and hence of the devices of which they form part, with consequent possible detriment to safety during running or inability to use the vehicle. An object of the present invention is to provide an improved device for controlling and enabling the start of a motorcycle engine in accordance with claim 1. A particular object of the invention is to provide a device without presetting problems, which is unaffected by vehicle vibration, and does not suffer from particular problems related to physical factors (moisture and water infiltration). A further object is to provide a device which can be easily mounted on a motorcycle and is easily accessible for normal maintenance. These and further objects which will be apparent to the expert of the art are attained by a device in accordance with the accompanying claims. The present invention will be more apparent from the accompanying drawings, which are provided by way of non-limiting example and in which: Figure 1 is a block diagram of the device of the invention; Figure 2 is a schematic cross-section through a part of the motorcycle with which a part of the device of Figure 1 is associated; Figure 3 is a front view of a motorcycle side support element with which another part of the device of Figure 1 is associated; Figure 4 is a view from above of the side support element of Figure 3; and Figure 5 is a truth table in accordance with which the device of the invention operates. With reference to said figures, the device of the invention comprises a unit 1 for controlling the firing of a motorcycle engine and connected to sensor means 2, 3 and 4 sensing respectively the idle gear position, the position of a side support element 5 of the vehicle (ie its retracted position close to the vehicle frame, not shown, and its extended position in which it supports the motorcycle), and the position of a clutch lever 6 located on a bar or vehicle half-handlebar 7 on which there is positioned a usual handgrip 8 (ie the position away from or towards the handgrip which the lever assumes when the user wishes to operate the clutch to change its position from disengaged or engaged). The sensor means 3 and 4 are proximity sensors comprising a part 3B and 4B associated with the respective movable member (support element 5 and lever 6) and a fixed part 3A and 4A associated with that fixed part of the vehicle in front of which said member moves. The sensor 2 is a mechanical switch 2A which closes when the gear control is in the idle position. More specifically, in one embodiment, the sensors 3 and 4 are Hall effect sensors. With reference to Figure 2, such a sensor forms the fixed part 4A associated with the half-handlebar (within the handgrip 8 in any known manner) and is arranged to cooperate with a permanent magnet defining the movable part 4B of the sensor means 4 associated with the lever 6. Likewise, the Hall effect sensor forms the fixed part 3A of the sensor means 3 associated with the side support element 5, whereas a permanent magnet, associated with the support element, forms the movable part 3B of said sensor means. The magnet 3B is supported by a plate-like arm 10 rigid with a pin 11 fixed to the support element 5 and movable with this latter within a seat 12 in a support element carrier plate 13 fixed in known manner to the motorcycle frame. The sensor 3A is positioned and fixed within this plate. The control unit 1, preferably of logic gate type, comprises a circuit block representing the input stage 20 to which the sensors 2, 3 and 4 are connected via inputs A, C and B respectively. The block 20 is connected to a logic block 21 which, on the basis of the electrical signals originating from said sensors, activates members 22, 23 and 24 of a control block 25 which via an output Q1 controls the engine ignition parameters and members, via an output Q2 controls the activation of a starter motor, and via an output Q3 controls the activation of a display or luminous indicator 26 positioned on the vehicle dash panel. The members 22 and 23 are relay circuit blocks and the member 24 is a transistor circuit block. The unit 1 also comprises a usual power system 40 connected to the blocks 20, 21, 25. The logic block 21 activates the various members of the control block 25 in accordance with algorithms shown in the truth table of Figure 5, in which: the letter A indicates the input of the signal originating from the idle sensor; this signal is indicated for example by the logic value 0 if the handgrip control is in idle, or 1 if in engaged; the letter B indicates the input of the signal originating from the sensor 4 indicating the position of the clutch lever 6 or the clutch control; the logic value 0 indicates for example that the lever is positioned close to the handgrip 8 and 1 indicates that it is distant therefrom; the letter C indicates the input of the signal originating from the sensor 3 located on the support element; the logic value 0 indicates for example that the support element is in its extended position distant from the motorcycle frame, and 1 indicates that it is in its retracted position close to said frame; Q1, Q2, Q3 indicate the outputs of the unit 1 as heretofore defined. In particular: the output Q1 can assume logic values 0 or 1 respectively indicating, for example, a negation or an assent of said unit to the firing of the engine (by means of appropriate control of the members which enable it) or to the maintaining of engine operation; the output Q2 can assume logic values 0 or 1 respectively indicating, for example, a negation or an assent of the unit 1 to the activation of the engine starter motor; the output Q3 enables the unit 1 to set the indicator 26 to ON or OFF. It will now be assumed that the device of the invention is to be used. It will be assumed specifically that the gear is in idle (logic value 0), that the clutch lever is in the extended position (logic value 1) and that the support element is extended (logic value 0). This corresponds to the second line (in black) of the table of Figure 5. Under these conditions, the unit senses that the engine is disconnected from the user item (wheel) and hence gives assent (logic state 1) to its start by activating the starter motor. At the same time it activates the indicator or warning lamp 26. In the condition represented by the seventh line from the top of the table of Figure 5 (vehicle use condition), activation of the starter motor is excluded. This is the condition in which the support element is retracted and the engine transmits power to the wheel. The device of the invention hence preferably uses the unit 1. This unit could however be replaced by a microprocessor which implements the conditions shown in Table 5. The use of a microprocessor enables the motorcycle to be provided with a possible coded anti-theft device; alternatively the code for the vehicle user can be implemented by feeding signals to this unit by suitably moving the lever 6 and/or the support element 5. A preferred embodiment of the invention has been described. Others are however possible (such as one in which for example the sensor 2 is also a Hall effect sensor or the sensors 3 and 4 are inductive sensors) while remaining within the scope of the present document.

Claims: A motorcycle having an engine start-enabling device, comprising a frame, a starter motor for said engine, a member for transmitting the power generated by said engine to a wheel, a clutch located on said member, a movable element (6) for manually operating said clutch arranged to set this latter in at least two working positions, namely an idle position and a motion engagement position, a motorcycle side support element (5) movable between two working positions, namely a retracted position and an extended position in which it supports the vehicle, engine start control means (1), and means (3, 4) for sensing the position of the clutch moveable element (6) relative to a fixed vehicle part (8) with which it is associated, and for sensing the position of the side support element (5) relative to a fixed frame part (13), characterised in that the sensor means (3, 4) are proximity sensor means comprising two mutually cooperating spaced-apart portions (3A, 3B; 4A, 4B), a first portion (3A, 4A) being associated with said fixed parts (13, 8) and the second (3B, 4B) being associated with the movable elements (5, 6), whereby said start-enabling device is controlled. A motorcycle as claimed in claim 1, characterised in that the sensor means (3, 4) comprise a Hall effect sensor. A motorcycle as claimed in claim 2, characterised in that the Hall effect sensor defines the first portion (3A, 4A) of each sensor means, the second portion (3B, 4B) being a permanent magnet. A motorcycle as claimed in claim 3, characterised in that the Hall effect sensor (3A) of the sensor means (3) associated with the side support element (5) is fixed to a support element carrier plate (13), the permanent magnet (3B) being rigid with said side support element(5). A motorcycle as claimed in claim 3, characterised in that the Hall effect sensor (4A) of the sensor means (4) associated with the clutch operating element (6) is fixed to the half-handlebar of the motorcycle, the permanent magnet being rigid with said clutch moveable element (6). A motorcycle as claimed in claim 5, characterised in that the Hall effect sensor is positioned inside the handgrip. A motorcycle as claimed in claim 1, characterised in that the control means are a unit (1) for controlling the starter motor operation and the engine start conditions, said unit receiving the electrical signals generated by the sensor means (2, 3, 4) and on the basis thereof acting on said motor, on an indicator lamp (26) for the position of the side support element (5) of the motorcycle, and on usual engine parts for firing it and maintaining it in operation. A motorcycle as claimed in claim 7, characterised in that the control unit (1) is a microprocessor. A motorcycle as claimed in claim 7, characterised in that the control unit (1) is a logic gate electrical circuit. A motorcycle as claimed in claim 7, characterised in that the control unit (1) and the sensor means (3, 4) define a vehicle antitheft circuit. A motorcycle as claimed in claim 1, characterised in that the sensor means are inductive sensors.

Inventors: NEGRONI LUCIANO, ZAVA ZENO, NEGRONI, LUCIANO, ZAVA, ZENO
Applicants: DUCATI MOTOR S P A, DUCATI MOTOR S.P.A.
Application year: 1997
Main classification: B62H1
IPC codes: B60K28, B62H1