JPS62170771A - Engine starting device - Google Patents

Abstract

PURPOSE:To prevent the exhaust in a battery during engine starting, by providing a means for preventing the driving of a starter motor at the time when high speed running is selective by a secondary speed change gear while a governor mechanism being operated. CONSTITUTION:In the case of a rotating drive system, a secondary speed change gear for changing over running speeds is provided in parallel to a primary speed change gear. When, a high speed running is selected by the secondary speed change gear with a governor mechanism operated, both switched 20, 21 are turned off. Thus, both transistors 18, 19 are turned off. As a result, a contact 26b is kept to be opened, then a contact 27b is kept to be opened so that a starter motor is never driven. Therefore, it is possible to suppress the lost drive of the starter motor during starting so as to prevent the exhaust in battery.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine starting device for a multi-purpose vehicle with an auxiliary transmission.

[Conventional technology]

In general, multi-purpose vehicles are equipped with a sub-transmission for switching between high-speed running (normal running) and low-speed running, in addition to a main transmission that switches speeds between multiple speeds. When the vehicle is traveling on a normal road, high-speed travel is selected in the sub-transmission, and low-speed travel is selected when performing desired work while driving external work equipment in a farmland or the like. Note that external work equipment is normally driven using PTO (Power Take 0).
ff) Utilizes the rotational force of the shaft. Here, the PTO shaft is a shaft that is rotated by the output of the vehicle drive engine, and various external work equipment such as grass cutting blades and sprayers can be attached to this PTO shaft as necessary. .

On the other hand, such multi-purpose vehicles are provided with a governor mechanism for controlling the engine rotation speed at a constant level. Then, when attaching external work equipment to the PTO shaft and selecting low-speed travel using the auxiliary transmission to perform the desired work,
By operating this governor mechanism, the rotational speed of the PTO shaft is kept constant and travel at a constant speed is made possible, thereby stabilizing PTO work.

[Problem that the invention seeks to solve]

In this way, it has conventionally been possible to drive at a constant speed by activating the governor mechanism during PTO work while driving at low speeds, but conversely, it has been possible to operate the governor mechanism when high speed driving is selected with the auxiliary transmission. If this happens, there is a problem in that when the engine is started, it suddenly transitions from a stopped state to a high-speed constant running state. In addition, in vehicles where the engine misfires if the governor mechanism is activated when high-speed driving is selected with the sub-transmission, starting the engine in this state will drive the starter motor unnecessarily, and the battery will run out. There was a problem with causing it.

[Means for solving problems]

The engine starting device of the present invention has been developed in view of the above-mentioned problems, and includes means for preventing the starter motor from being driven when the auxiliary transmission selects high-speed running and the governor mechanism selects its operation. It is something that

[Operation] If the governor mechanism is mistakenly turned on when high-speed travel is selected in the sub-transmission, the starter motor will not be driven.

〔Example〕

Hereinafter, the present invention will be described in detail along with examples.

FIG. 2 is a power transmission system diagram of an example of a multi-purpose vehicle to which the present invention is applied, that is, a vehicle having an auxiliary transmission inserted in series with a main transmission in a rotary drive system. The rotational force of the crankshaft 1 of the engine is transmitted to a clutch 3 that engages and engages the engine, and the rotational force output from the clutch 3 is transmitted to a submission (auxiliary transmission) 4 and a PTO shaft 8. In submission 4, a gear selection is made between high speed ("High"), low speed ("Low"), or reverse ("Reverse"), and if "Reverse" is selected, rotational force in the opposite direction is performed. is directly transmitted to the differential gear 6 at a low rotational speed. If "High" or "Low" is selected in Submission 4, the forward transmission (main transmission) 5
A forward high-speed or low-speed rotational force is transmitted to the differential gear 6 via the differential gear 6 . 1 in forward mission 5
Either gears from 5th to 5th or neutral are selected. In the differential gear 6, either differential operation or lock is selected and transmitted to the wheels 7. For the differential gear 6, when the vehicle is traveling straight, "lock" is normally selected to stabilize travel, and when the vehicle is making a U-turn, "activation" is appropriately selected.

On the other hand, "on" and "off" are also selected for the PTO shaft 8, and when "U on" is selected, the rotational force output from the clutch 3 is transmitted to the work equipment 9, and "off" is selected. In this case, the PTO shaft 8 stops rotating regardless of the rotation of the output shaft of the clutch 3. Note that 2 is a starter motor, which is electrically driven to forcibly rotate the crankshaft to start the engine.

FIG. 1 is a circuit diagram showing an embodiment of the present invention used in a vehicle having a power transmission system as described above. 11
is the spark plug, 12 is the ignition coil, 13 is C
The DI unit 14 is a charge coil, and these constitute a capacitive discharge type ignition device. In addition, C
In the DI unit 13, 13a is a capacitor, 1
3b is a silice, and 13c and 13d are diodes.

A discharge circuit consisting of a thyristor 15 and resistors 16 and 17 is connected to the connection point between the charge coil 14 and the CDI unit 13, and the gate of the thyristor 15 is connected to the resistor 16.
and 17 connection points. The collectors of switching pnp transistors 18 and 19 whose emitters are grounded are connected to the connection point between the resistors 1G and 17 via diodes 30. In addition, diode 3
0 has its cathode connected to the collector of transistor 18.19. The base of the transistor 18 is connected to a connection point between the resistor 22 and the switch 21 in a series circuit consisting of a power supply connection terminal 23, a resistor 22, a switch 21 interlocked with the governor mechanism selection lever, and ground. Note that the switch 21 is operated to be closed when the governor mechanism selection lever is selected as "actuated". In addition, the transistor 19 has a power supply connection terminal 23 and a resistor 24.
, switch 2 linked to the selection lever of submission 4
It is connected to the connection point between the resistor 24 and the switch 20 in a series circuit consisting of 0 and ground. The switch 20 is closed when high speed driving is selected in the submission 4, and is opened in other cases (low speed or reverse).

On the other hand, a starter button 25, a starting safety relay 26, a starter relay 27, and a starter motor 28 constitute a starting circuit. A fixed contact of the starter motor 25 is connected to a power supply connection terminal 23, and a movable contact is connected to one terminal of a contact drive coil 26a of a starting safety relay 26.

The other end of the contact drive coil 26a is connected to a connection point between the cathode of the diode 30 and the collector of the transistor 18. One end of the contact 26b of the starting safety relay 26 is connected to the movable contact of the starter button 25, and the other end is grounded via a contact drive coil 27a of the starter relay 27. One end of the contact 27b of the starter relay 27 is connected to the power supply connection terminal 23, and the other end is connected to the input terminal of the starter motor 28, and the other terminal of the starter motor 28 is grounded.

Next, the operation of this embodiment configured as described above will be explained. When "low" is selected in submission 4 and "operate" is selected in the governor mechanism, switch 2
0 is open and switch 21 is closed. Therefore,
Transistor 18 is in the "off" state, while transistor 19 is in the "on" state. Therefore, when the starter button 25 is operated and closed, the "power supply connection terminal 23-
Starter button 25-coil 26a-) transistor 19
A closed circuit is formed, current flows through the coil 26a, and the contact 26b is closed. Then, “Power connection terminal 2
3-Starter button 25-Contact 26b-Coil 27a"
A closed circuit is formed, and current flows through the coil 27a.
Contact 27b is closed. When the contact 27b is opened, current flows from the power supply connection terminal 23 to the starter motor 28, the starter motor 28 rotates, and the engine is started.

Next, when "high (high-speed running)" is selected in submission 4 while the governor mechanism is in the operating state, both switches 20 and 21 are closed. Both transistors 19 and 18 are then "off". Therefore, even if the starter button 25 is operated and closed, no current flows through the coil 26b. As a result, the contact 26b is kept open, and the contact 27b is also kept open, so that the starter motor 28 is not driven.

Please note that "High (high speed running)" is required for submission 4.
is selected and the governor mechanism is turned on, at least one of transistors 19 and 18 is turned on.
To turn on the coil 26 via either transistor I9 or 18, closing the starter button 25 turns on the coil 26.
Current flows through a, and the starter motor 28 is driven normally.

In addition, in this example, in submission 4, "low"
is selected and "operation" is selected in the governor mechanism, that is, when both transistors 18 and 19 are in the "off" state, even if an electromotive force is generated in the charge coil 14, the gate potential of the thyristor 15 will not rise. The thyristor 15 becomes conductive. Therefore, the electromotive force generated in the charge coil 14 is not supplied to the CDI unit 13 but is grounded via the thyristor 15. Therefore, CDI
The capacitor 13a in the unit 13 is not charged with electric charge, and a spark cannot be generated in the spark plug 11. In other words, the engine will misfire.

〔Effect of the invention〕

As explained above, according to the engine starting device of the present invention, if the governor mechanism is in the 1-on state when high-speed running is selected in the auxiliary transmission, the starter motor does not drive. Therefore, the problem of sudden transition from a stopped state to a high-speed constant running state is eliminated. Also, in vehicles where the engine misfires if the governor mechanism is activated when high speed driving is selected with the sub-transmission,
Since unnecessary driving of the starter motor at the time of starting can be prevented, this is effective in preventing the battery from running out.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing one embodiment of the present invention, and Fig. 2 is a circuit diagram showing an embodiment of the present invention.
FIG. 2 is a power transmission system diagram of a vehicle to which the illustrated embodiment is applied. 18.19...Transistor, 20.21...Switch, 25...Starter button, 26...Starting safety relay, 27...Starter relay, 28...Starter motor.

Claims (1)

[Claims] In a vehicle that has an auxiliary transmission that is inserted in series with the main transmission in the rotational drive system and switches between high-speed and low-speed driving, and a governor mechanism that maintains the engine rotational speed at a constant speed, the engine is forced to rotate and the An engine starting device comprising an electrically driven starter motor for starting an engine, and means for preventing the starter motor from being driven when a sub-transmission selects high-speed travel and a governor mechanism selects its operation.