JPS6320838Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to an engine restart device, and more particularly, to an engine restart device that restarts the engine by using the rotational energy stored in the freewheel before the engine is automatically stopped. As a conventional engine restart device, one described in, for example, Japanese Patent Application Laid-open No. 117246/1983 is known. This engine restart device is constructed as shown in FIG. 1, and in FIG. 1, 1 is the crankshaft of the engine. A flywheel 2 is fixed to the crankshaft 1 with bolts 3, and a clutch friction plate 5 and a freewheel 6 are attached to the flywheel 2 via bearings 4 so that the flywheel 2 can rotate freely in only one direction. It is attached so that it can slide freely in the axial direction of 2. A clutch mechanism 7 for attaching and detaching the freewheel 6 to the flywheel 2 via a clutch friction plate 5 is assembled to the freewheel 6, and the clutch mechanism 7 has a magnetic switch 8 and a spring 9. There is. A ring gear 11 that meshes with a starter 10 is attached to the flywheel 2. In addition, 1
2 is a clutch device. In this engine restart device, when the engine is rotating, the magnet switch 8 is energized to operate the clutch mechanism 7, causing the freewheel 6 to slide and engage the flywheel 2 via the clutch friction plate 5. do. In this state, rotational energy of the engine is applied to the freewheel 6, and when the engine is to be stopped, power to the spark plug is cut off. At the same time, the magnet switch 8 is de-energized, the freewheel 6 is slid by the spring 9, and the flywheel 2 is disengaged. In this state, the freewheel 6 begins a freely decelerated rotational motion, and rotational energy is stored in the freewheel 6. When restarting the engine, the magnet switch 8 and the spark plug are energized again to slide the freewheel 6 toward the flywheel 2 and transfer the rotational energy stored in the freewheel 6 through the clutch friction plate 5. Give to wheel 2. This freewheel 6
The engine is restarted by the rotational energy stored in the engine. However, in such conventional engine restart devices, the freewheel slides and is attached to and detached from the flywheel via a clutch friction plate, resulting in axial play and wobbling of the freewheel. , and wear of the clutch friction plate also occurs. Therefore, the free deceleration rotation of the freewheel is inhibited, and the rotational energy of the freewheel is not sufficiently transmitted to the flywheel. As a result, it becomes impossible to restart the engine using the engine restart device, and each time the engine is automatically stopped, the engine must be started using the starter, resulting in problems such as so-called battery build-up and traffic congestion. This idea was created by focusing on these conventional problems. After the engine is automatically stopped by the engine stop means, when the engine is restarted, the freewheel is connected to the flywheel and the freewheel stores the energy. In an engine restart device that restarts an engine using generated rotational energy,
The above-mentioned problem can be solved by including a detection means for detecting the state of contact and separation between the freewheel and the flywheel, and a control circuit for stopping the operation of the engine stop means in response to a signal from the detection means. It aims to solve the problem. This invention will be explained below based on the drawings. 2 to 5 are diagrams showing a first embodiment of this invention. First, to explain the configuration, in Fig. 2, 21
is the crankshaft (output shaft) of the engine, and the flywheel 22 is attached to the crankshaft 21 with bolts 23.
Fixed by An inner ring of a bearing 25 is fixed to a sleeve 24 and a flywheel 22 incorporated in the crankshaft 21, and a freewheel 26 having a substantially U-shaped cross section is fixed to an outer ring of the bearing 25. A magnetic pole body 27 is fixed to the rear plate 28 of the engine body so as to be housed in the hollow part of the freewheel 26, and an electromagnetic coil 30 enclosed in a bobbin 29 is incorporated into the magnetic pole body 20. There is. A clutch disk 31 is fitted to the end surface of the freewheel 26 on the flywheel 22 side, and a movable iron piece 32 is fixed to the flywheel 22 by bolts 33 on the surface of the flywheel 22 facing the clutch disk 31. It is fixed to the spring 34. These magnetic pole bodies 2
7, the bobbin 29, the electromagnetic coil 30, the clutch disk 31, the leaf spring 34, and the movable iron piece 32 constitute an electromagnetic clutch E as a whole. Further, the clutch disk 31 of the freewheel 26 has electrodes 35a and 35b at both ends in the radial direction.
As shown in the figure, these electrodes 35a and 35b are attached to the brush 3 attached to the lower end surface of the freewheel 26 on the rear plate 28 side.
6. The brush 36 is in pressure contact with a spring 38 provided on the rear plate 28 and connected to the storage battery via a resistor 37.
6, as shown in FIG. 4, electrodes 35a, 35b
The brush contact 39 is connected to the slip ring 38, and the spring 40 presses the brush contact 39 against the slip ring 38. The electrodes 35a, 35b, the brush 36, the slip spring 38, and the resistor 37 constitute a detection means 41 as a whole. In addition,
A ring gear 42 that meshes with a starter output gear (not shown) is provided on the outer periphery of the freewheel 26, and the flywheel 22 is connected to an existing clutch device 43. Next, FIG. 5 will be explained. In FIG. 5, 51 indicates the engine rotation transfer,
For example, the engine rotation speed detection means detects using an ignition pulse or a crank angle sensor and outputs a signal proportional to the engine rotation speed, and the engine rotation speed detection means 51 is connected to a comparator 52 and 53. A reference signal generator 54 that outputs a signal corresponding to the stopped state of the engine is further connected to the comparator 52, and the comparator 52 is connected to the engine rotation speed detection means 5.
1 and the signal from the reference signal generator 54, and outputs a high-level signal (hereinafter also referred to as the [1] signal) to the AND circuit 55 only when the engine is rotating. . Comparator 53
For example, the rotation speed of the freewheel 26 is detected by a ring gear 42 and an electromagnetic pickup,
A signal from a freewheel rotational speed detection means 56 that outputs a signal corresponding to the rotational speed of the freewheel 26 is input, and a comparator 53 receives a signal from the engine rotational speed detection means 51 and a signal from the freewheel rotational speed detection means 56. When the engine speed is the same as or lower than the freewheel 26 speed, the signal [1] is sent to the AND circuit 5.
Output to 7. Freewheel rotation speed detection means 5
6 is further connected to a comparator 58, and a signal from a reference signal generator 59 corresponding to a predetermined rotation speed (for example, 800 rpm) of the freewheel 26 is inputted to the comparator 58. Comparator 58
compares the signal from the freewheel rotation speed detection means 56 and the signal from the reference signal generator 59, and outputs the signal [1] to the AND circuit 57 only when the freewheel 26 is rotating at a predetermined rotation speed or higher. The signal from the operating state detection means 60 is input to the AND circuit 57. The driving state detection means 60 detects, for example, the engine speed, changes in the engine speed, throttle opening, vehicle speed, etc.
A signal of [1] is output to the AND circuit 57, and a signal of [1] is output to the AND circuit 61 only in the idling state.
Outputs the signal. The AND circuit 57 includes a comparator 53,
Only when the signals from the comparator 58 and the operating state detection means 60 are all [1] signals, a signal of [1] is sent to the coil energization control circuit 62 and the AND circuit 61.
When the coil energization control circuit 62 receives the signal [1] from the AND circuit 57, it then outputs a low level signal (hereinafter referred to as

The electromagnetic coil 30 continues to be energized unless a signal [0] is input or a reset signal is input from another source. That is, unless a reset signal is input to the coil energization control circuit 62 from another source, the electromagnetic coil 30 is in a decelerating state or an idling state, the freewheel 26 is rotating at a predetermined number of revolutions or more, and the engine is in a decelerating state or an idling state. When the condition that the number of rotations is equal to or less than the number of rotations of the freewheel 26 (hereinafter referred to as condition A) is satisfied, electricity is applied. As described above, the AND circuit 61 to which the signal from the AND circuit 57 is input receives the signal from the operating state detection means 60,
The AND circuit 61 outputs a signal [1] to the delay circuit 64 only when the signals from the AND circuit 57 and the driving state detection circuit 60 are both [1] signals.
When the delay circuit 64 receives the signal [1], it outputs the signal [1] to the engine stop means 65 after a predetermined delay time (for example, 1 to 2 seconds), and the engine stop means 65 outputs the signal [1] to the delay circuit 64. When a signal from [1] is input, the engine is stopped by cutting off the ignition system or fuel system unless a reset signal is input from another source. That is, the engine stop means 65 receives an input signal and stops the engine only when the engine is in an idling state unless a reset signal is input from another source and the above-mentioned condition A is satisfied. AND to which the signal from the comparator 52 is input
A signal from the starting operation detection means 66 is further input to the circuit 55.
detects the driver's starting operation, such as depressing the clutch pedal or accelerator pedal, and when the starting operation is performed, the starting operation detection means 66 sends the signal [1] to the AND circuit 5.
Output to 5. The AND circuit 55 outputs the signal [1] to the reset terminal of the engine stop means 65 and the reset terminal of the coil energization control circuit 62 only when the signal [1] is input from both the comparator 52 and the start operation detection means 66. However, when the signal [1] is input to the reset terminal, the engine stop means 65 releases the cutoff to the ignition system or the fuel system and releases the engine stop. Further, the coil energization control circuit 62 energizes the electromagnetic coil 30 when a signal [1] is input to the reset terminal. That is, the AND circuit 55 indicates that the engine is stopped and
and the condition that the start operation was performed (hereinafter referred to as B)
When the conditions (sometimes referred to as conditions) are satisfied, the stoppage of the engine is canceled and the electromagnetic coil 30 is
energize. A signal from the AND circuit 57 is input.
A signal from a comparator 67 is further input to the AND circuit 63, and the voltage of the slip ring 38 in contact with the brush 36 mentioned above is applied to the negative terminal of the comparator 67. Further, a predetermined reference voltage (for example, 6V) is applied to the positive terminal of the comparator 67, and the comparator 67 compares the reference voltage with the voltage of the slip ring 38 to
When the voltage of is lower than the reference voltage, the signal of [1] is
Output to AND circuit 63. AND circuit 63
Only when the signal from the AND circuit 57 and the signal from the comparator 67 are both signals of [1], a signal of [1] is output to the alarm device 68, the engine stop means 65, and the coil energization control circuit 62. Alarm device 6
8 is a lamp, a buzzer, or a sound device, for example, and when the signal [1] is input from the AND circuit 63, it is activated to notify the driver of an abnormality. Further, when the signal [1] is input from the AND circuit 63 to the engine stop means 65 and the coil energization control circuit 62, the engine stop means 65 sends the signal [1] from the AND circuit 61 to the delay circuit 64. Even if the signal . That is,
When the signal [1] is input from the AND circuit 63 to the coil energization control circuit 62, the energization to the electromagnetic coil 30 is cut off, and the movable iron piece 32 attached to the flywheel 22 separates from the freewheel 26. When, at the same time, either or both of the electrodes 35a and 35b are in contact with the movable iron piece 32, the slip ring 38
a, 35b, the movable iron piece 32, the flywheel 22, etc., to be grounded. Therefore, the voltage at the negative terminal of comparator 67 decreases,
The comparator 67 outputs a signal of [1] to the AND circuit 63. As a result, if the freewheel 26 is in contact with the movable iron piece 32, that is, the flywheel 22 when it should be apart, the AND circuit 63 notifies the driver of the abnormality, prevents the engine from stopping, and further prevents the freewheel 26 from stopping. and the flywheel 22 are kept separated. Note that the comparator 67 and the AND circuit 63 constitute a control circuit 69 as a whole. Next, the effect will be explained. When the vehicle is accelerating or driving at a constant speed, the electromagnetic coil 30 is energized and the freewheel 2
6 and the flywheel 22 are connected and rotate together. That is, in this operating state, the AND circuit 57 detects the operating state detection circuit 60 of the above-mentioned condition A.
The AND circuit 57 does not satisfy the signal from [1]
This signal is not output to the coil energization control circuit 62.
Therefore, the electromagnetic coil 30 is energized and attracts the movable iron piece 32, and the freewheel 26 and flywheel 22 rotate together. At this time, rotational energy is applied to the freewheel 26 from the flywheel 22. Next, when deceleration operation starts, the energization to the electromagnetic coil 30 is cut off, and the freewheel 26 starts free deceleration rotational motion. That is, in this operating state, the AND circuit 57 satisfies condition A,
The AND circuit 57 outputs a signal [1] to the coil energization control circuit 62 to cut off the energization to the electromagnetic coil 30. Therefore, the movable iron piece 32 is a leaf spring 34.
The elastic force causes the freewheel 36 to separate from the freewheel 26, and the freewheel 36 begins to freely decelerate rotational movement. However, in this operating state, if the freewheel 26 or the flywheel 22 has rotational vibration in its axial direction or the leaf spring 34 has deteriorated, and there is an abnormality in the state of separation between the freewheel 26 and the flywheel 22. , activates the warning device 68 to notify the driver of the abnormality and prevents the operation of the engine stop means 65, and also activates the electromagnetic coil 3.
0 continues to be cut off. That is, if there is an abnormality in the contact/separation state, one or both of the electrodes 35a and 35b provided on the freewheel 26 will come into contact with the movable iron piece 32, and as described above, will be grounded and the comparator 67 will be set to [1]. The signal is output to the AND circuit 63. At this time, since the signal [1] is input from the AND circuit 57 to the AND circuit 63,
The AND circuit 63 sends the signal [1] to the alarm device 68,
It is output to the engine stop means 65 and the coil energization control circuit 62. Therefore, the alarm device 68 is activated to notify the driver of the abnormality, the engine stop means 65 is prevented from operating, and furthermore, the power to the electromagnetic coil 30 continues to be cut off. As a result, since the freewheel 26 and the flywheel 22 are in an abnormal state of contact and separation, the freewheel 26
The problem of inability to restart the engine due to insufficient rotational energy stored in the engine does not occur. Furthermore, since the electromagnetic coil 30 is de-energized, the vibration of the freewheel 26 in the axial direction is not transmitted to other drive systems. Furthermore, when the engine enters a stop state from a deceleration state, the engine is automatically stopped, but the freewheel 26 continues its free deceleration rotational motion. That is, when the vehicle is stopped, the signal from the AND circuit 57 is already [1]
The signal [1] is inputted from the operating state detection means 60 to the AND circuit 61 to which the signal [1] is inputted.
Therefore, the AND circuit 61 outputs a signal [1] to the delay circuit 64, and the delay circuit 64 outputs a signal [1] after a predetermined delay time to the engine stop means 65.
Output to. As a result, the engine stop means 65 is activated, cutting off the ignition system or the fuel system and stopping the engine. However, as mentioned above,
When there is an abnormality in the state of separation between the freewheel 26 and the flywheel 22, a signal [1] is input from the AND circuit 63 to the engine stop means 65, and the engine stop means 65 is connected to the AND circuit 61.
Even if a signal [1] is input from the delay circuit 64 through the delay circuit 64, the engine does not operate and does not stop the engine. When the rotational speed of the freewheel 26 decreases to a predetermined rotational speed or less while the engine is stopped, the electromagnetic coil 30 is energized again, the engine stopping means 65 is deactivated, and the engine is restarted. That is,
When the rotational speed of the freewheel 26 falls below a predetermined rotational speed, the output signal of the comparator 58 changes from [1] to

The signal changes to [0], and the output signal of the AND circuit 57 changes from [1].

Switches to [0] signal. Therefore, the coil energization control circuit 62 resumes energizing the electromagnetic coil 30, and the engine stop means 65 cancels its operation and resumes conduction to the ignition system or fuel system. As a result, the engine is restarted by the rotational energy stored in the freewheel 26 before the rotational speed of the freewheel 26 decreases to a rotational speed that cannot be restarted. When moving from a stopped state to a starting state, the engine is restarted by the rotational energy stored in the freewheel 26. That is, when a starting operation is performed, the starting operation detection means 66 outputs the signal [1].
The signal is output to the AND circuit 55, and the signal [1] from the comparator 52 has already been input to the AND circuit 55. Therefore, the AND circuit 55 outputs the signal [1] to the engine stop means 65 and the coil energization control circuit 62 as a reset signal, and the conduction of the ignition system or fuel system of the engine is restarted, and the electromagnetic coil 30 is turned off. Power is restored. As a result, the engine is restarted by the rotational energy stored in the freewheel 26. In this way, when there is no abnormality in the contact/separation state between the freewheel 26 and the flywheel 22 due to vibration in the axial direction, the engine can be restarted by the rotational energy stored in the freewheel 26, and the freewheel 26 When the stored rotational energy becomes less than a predetermined value, the engine is restarted in the same way, and it is possible to prevent the engine from becoming impossible to restart at the time of starting the vehicle. Furthermore, if there is an abnormality in the contact/separation state between the freewheel 26 and the flywheel 22, the engine is prevented from automatically stopping, which prevents the engine from being restarted by the freewheel 26 at the time of starting. It can be prevented. FIG. 6 shows a second embodiment of this invention. This embodiment deals with an abnormal situation where the freewheel and flywheel are in contact when they should be apart, whereas the above embodiment deals with the abnormal situation where the freewheel and flywheel are in contact when they should be apart. This is to deal with abnormal conditions. In addition,
In the explanation of this embodiment, the same components as those of the first embodiment shown in FIGS. 2 to 5 are given the same reference numerals, and the explanation thereof will be omitted. Since the components are the same, the drawings are also omitted. In FIG. 6, 71 is an inverter connected between the output terminal of the AND circuit 57 and one input terminal of the AND circuit 63, and 72 is an inverter connected between the comparator 67 and the other input terminal of the AND circuit 63. It is an inverter connected to. Note that the comparator 67, inverter 71, inverter 72 and
The AND circuit 63 constitutes a control circuit 73 as a whole. Therefore, the AND circuit 63 outputs both the output signal of the AND circuit 57 and the output signal of the comparator 67.

When the signal is [0], the signal [1] is sent to the alarm device 6.
8. Output to engine stop means 65 and coil energization control circuit 62. That is, the AND circuit 57
but

During acceleration or constant speed operation where a signal of [0] is output, normally the electromagnetic coil 30 is energized, the movable iron piece 32 contacts the electrodes 35a and 35b, and the comparator 67 outputs a signal of [1]. , due to wear of the clutch disk 31, movable iron piece 32, etc., displacement of the freewheel 26 in the axial direction, etc.
5a, 35b are not in contact with the movable iron piece 32, the comparator 67 is

Outputs a signal of [0].
As a result, the AND circuit 63
If 6 and flywheel 22 are separated when they should be joined, alarm device 68 is activated, engine stop means 65 is prevented from operating, and energization to electromagnetic coil 30 is cut off. As described above, in this embodiment, even if the electromagnetic coil 30 is energized when the engine is restarted, the rotational energy of the freewheel 26 is transferred to the flywheel 22.
The freewheel 26 is not sufficiently transmitted to
The alarm device 68 is activated to notify the driver of an abnormality in the state of contact and separation between the flywheel 22 and the flywheel 22.
By preventing the engine stopping means 65 from automatically stopping the engine, it is possible to prevent the engine from becoming impossible to restart due to the rotational energy of the freewheel 26. Furthermore, by cutting off the power to the electromagnetic coil 30,
Progress of wear can be prevented. As explained above, according to this idea,
Its composition includes a freewheel rotatably provided with respect to the output shaft of the engine, a flywheel connected to the output shaft of the engine, and a clutch that connects and separates these freewheels and the flywheel.
an engine stop means for automatically stopping the engine;
In an engine restart device that restarts the engine by operating a clutch and transmitting the rotational energy stored in the freewheel to the flywheel when restarting the engine, the distance between the freewheel and the flywheel is The engine is equipped with a detection means for detecting a contact state, and a control circuit for stopping the operation of the engine stop means in response to a signal from the detection means, so that the axial direction due to rotational fluctuations of the freewheel or flywheel is provided. When an abnormality occurs in the state of contact and separation between the freewheel and the flywheel due to vibration or wear, the engine can be prevented from automatically stopping, and the inability to restart the engine by the freewheel can be prevented. Therefore, if the engine had been left to automatically stop, the engine would have to be restarted using the starter every time the vehicle was started, which would cause so-called battery build-up and cause traffic congestion. Since the engine is not automatically stopped, it is possible to eliminate these problems. In the first and second embodiments described above, since the freewheel can be moved into and out of contact with the flywheel without sliding, it is difficult for the freewheel to run out in the axial direction. Even if an abnormality occurs in the state of contact and separation between the freewheel and flywheel due to directional deflection or wear, this abnormality can be notified to the driver and dealt with promptly, and the axial deflection of the freewheel or flywheel can be prevented. Effects such as being able to prevent the influence from being transmitted to other drive systems and preventing the progress of wear can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing a conventional engine restart device, Figs. 2 to 5 are views showing a first embodiment of the engine restart device of this invention, and Fig. 2 is a schematic sectional view showing its structure. 3 is an enlarged sectional view of the electrode portion shown in FIG. 2, FIG. 4 is an enlarged sectional view of the brush portion shown in FIG. 2, FIG. 5 is its circuit configuration diagram, and FIG. FIG. 2 is a diagram showing a circuit configuration of a second embodiment of the engine restart device of this invention. 21... Crankshaft (output shaft), 22... Flywheel, 26... Freewheel, 41...
Detection means, 65...Engine stop means, 69,7
3...Control circuit, E...Electromagnetic clutch.

Claims (1)

[Scope of utility model registration request] A freewheel rotatably provided to the output shaft of the engine, a flywheel connected to the output shaft of the engine, a clutch that connects and separates the freewheel and the flywheel, and an engine stop means that automatically stops the engine. , has
An engine restart device that restarts the engine by operating a clutch and transmitting the rotational energy stored in the freewheel to the flywheel when restarting the engine detects the state of separation between the freewheel and the flywheel. a control circuit for stopping the operation of the engine stopping means in response to a signal from the detecting means;
An engine restart device characterized by comprising: