JPS5898658A - Starting apparatus for internal combustion engine - Google Patents

Abstract

PURPOSE:To enable to start an engine in a minimum time period and to reduce consumption of a battery, by judging whether the engine temperature is higher than a prescribed value or not at the initial stage of engine starting operation, and effecting inertial starting through control of current supply to an electromagnetic clutch. CONSTITUTION:A flywheel 32 is fixed to the output shaft 31 of an engine by means of bolts 33. At the time of starting the engine, a ring gear 37 fixed to an inertial mass member 34 comes into mesh with a pinion 38 of a starter motor. Further, when a clutch disk 41 comes into contact with a clutch facing member 39 by means of an electromagnetic coil 43, the inertial mass member 34 is turned together with the output shaft 31 of the engine. In case that the engine temperature is lower than a prescribed value, the engine is started by way of inertial starting by turning only the inertial mass member 34 through operation of the starter motor, and connecting the member 34 to the engine output shaft 31 after the engine speed is raised to a prescribed level. Thus, since the engine can be started in a minimum time while, it is enabled to reduce consumption of a battery.

Description

Detailed Description of the Invention The present invention provides an inertial mass body that can selectively rotate between a state in which it rotates freely relative to an engine output shaft and a state in which it rotates integrally with the engine output shaft by engaging and disengaging a clutch, and The present invention relates to an internal combustion engine starting device that uses a motor to obtain the energy necessary to start the engine.

An example of a starting device using a conventional inertial mass body (Japanese Patent Application Laid-Open No.
-1172415) are shown in FIGS. 1 and 2. 1st
The figure is a side sectional view of the main parts, where 1 is the engine output shaft, 2 is the flywheel that always rotates in unison with the engine output shaft 1, and 6
is a bolt that fixes the flywheel 2 to the engine output shaft 1,
4 is an inertial mass body for initial movement, 5 is a flywheel 2
a freewheel that transmits rotational force in only one direction from to the inertial mass body 4; 6 a clutch facing that rotates integrally with the inertial mass body 4; 7 a shift lever 18 connected to the inertial mass body 4; 1 is a magnet for a clutch that drives the shift lever 7, 9 is a ring gear installed integrally with the flywheel 2, 10 is a starting motor, and 11 is engaged with the ring gear 9 to connect the starting motor 10 to the flywheel 2.
13 is a transmission drive shaft, 1
4 is a clutch disk that connects and disconnects power transmission between the flywheel 2 and the transmission drive shaft 13; 14 is a clutch facing; 15 is a clutch lever that connects the clutch disk 16; and 16 is a shift lever 15. This is a magnet for the driving clutch.

7 to 2 is its circuit diagram, 17 is the battery, 18 is the main switch, 19 is the starter switch, 20 is the ignition coil, and 21 is the spark plug. It shows.

Normally, the main switch 18 is closed! !
In the rotating state, the actuation of the clutch magnet 8 connects the inertial mass body 4 to the flywheel 2 via the clutch facing 6, and the engine output shaft 11, flywheel 2, and inertial mass body 4 rotate together. do. If the main switch 18 is opened from the state shown in step 4, the spark plug 21 will no longer operate. A. The main switch 18 will be closed if the engine is to be restarted when the flywheel 2 or 1 engine is warmed up after being temporarily stopped due to the deenergization of the inertial mass body 4-piece clutch 11.1 and the magnet 8. The inertial mass body 4 is connected to the flywheel 2, and the engine can be restarted by the kinetic energy accumulated in the inertial mass body 4 before the engine is stopped.

In this way, the conventional example shown in Figure 1.2 restarts the engine using the kinetic energy accumulated in the inertial mass before the engine stops, improving fuel efficiency when driving in urban areas where starting and stopping are frequent. However, for an initial start (cold start) after a long stop, the starter switch 19 is turned ON to operate the starter motor 10, and the engine is directly started using its rotational force. Therefore, when starting at extremely low temperatures, it takes a long time to complete the explosion after turning on the starter inch, and battery consumption is also large.

As an example of a song for a starter device using a conventional inertial mass body, when the starting motor is activated, the clutch between the inertial mass body and the engine output shaft is disconnected, and the inertial mass body is driven to rotate at the beginning of Tanabata. After accumulating sufficient kinetic energy in the inertial mass body, connect the clutch and apply the kinetic energy of the body to the engine output shaft to reach 1. It is also considered to start an invasion (%K+l [41-5962, Utility Model Publication No. 54-124830).

In this way, at the time of initial startup, the inertia i (
1: Ij: co-rotating drive i~, and its stored energy (a bond that conducted an experiment to compare the starting time of a so-called inertial start and a 16-contact start of 11'i'iR). As shown in Figure 6, purchased starting is more advantageous when starting at extremely low temperatures, but inertial starting requires accelerating the stopped inertial mass to a rotational speed that allows inertial starting of the engine. It has been found that when the starting temperature is over a certain temperature (for example -20°C) (C), normal direct starting has a shorter start time and lower battery consumption.

The original classification was made by focusing on the above points. J) Depending on whether the inter-liquid temperature (cooling water temperature or oil temperature, etc.) at the time of initial heating is higher than the predetermined latent temperature, the engine can be started directly by the starting motor, or the inertial mass body can be driven and the accumulated energy can be used to increase the inertia. The present invention aims to provide an internal combustion engine starting device which can always start the engine in a minimum time regardless of temperature conditions and which consumes less battery.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 6 is a side sectional view of a main part showing an embodiment of the present invention.

In the figure, 31 is an engine output shaft (crankshaft). A flywheel 52 is fixed to the end surface of the engine output shaft 61 on the transmission side by bolts 66 in order to eliminate uneven rotation of the engine. 34 is an inertial mass body (second
flywheel). The inertial mass body 64 is press-fitted into a bearing 66 that is in contact with the boss of the flywheel filter 2 and the sleeve 35, so that it can normally rotate freely with respect to the engine output shaft 61. Reference numeral 67 denotes a ring gear provided on the inertial mass body 34, which engages with the pinion 38 of the starting motor to rotate the inertial mass body 34 when the engine is started. A clutch facing 69 is fixed to the end surface of the inertial mass body 34 on the opposite side from the plate by contacting or bolting.

A leaf spring 40 is secured to the liquid side end surface of the flywheel 62 with bolts 41, and a clutch disc 41 that moves into and out of contact with the clutch facing 39 is secured to the second leaf spring 40 with bolts 42. Reference numeral 46 designates a clutch electromagnetic coil, and the iron core 44 on which the electromagnetic coil 43 is wound is fixed to the rear plate 45 of the engine with bolts 46, and faces the engine side medium surface of the inertial mass filter 4 through a gap a. are doing. 4
7 is an inertial mass body 34 provided to prevent short circuit of magnetic flux.
This is the hollowed out part.

When the electromagnetic coil 4 is energized, 44-34-41-34
-44 Magnetic flux passing through the magnetic circuit exerts a force that tends to draw the clutch disk 41 made of ferromagnetic material toward the electromagnetic coil 43. The leaf spring 40 has a plurality of fan-shaped cutouts 48 and bolt holes 49.5 as shown in FIG.
The flywheel 62 is connected to the inner disk 41 through bolt holes 50 near the outer edge of the clutch disk 41.
When an electromagnetic attractive force is applied to the leaf spring 40, the leaf spring 40 deforms as shown by the broken line in FIG.
1 moves to a position where it comes into contact with the clutch facing 39, and kinetic energy can be transferred between the flywheel 62 and the inertial mass body 34, and the inertial mass body 34
can now rotate integrally with the engine output shaft 31. When the electromagnetic coil 460 is de-energized, the clutch disc 41 separates from the clutch facing 69 due to the restoring force of the leaf spring 40, and the inertial mass body 34 becomes able to freely rotate relative to the engine output shaft 31. The clutch that brings the inertial mass body 34 into and out of contact with the engine output shaft 31 may be an electromagnetic clutch, and is not limited to the above configuration.

51 is a clutch disk that connects and separates between the flywheel 62 and the transmission drive shaft 52; 55 is a pressure plate;
54 is a diaphragm spring (disc spring) that pressurizes the clutch disc 51 via the pressure plate 53;
55 is a sleeve that moves the transmission drive shaft 52F;
When the engine is started, the diaphragm spring 54 is moved to the sleeve 5 by depressing the Cranona pedal (not shown).
5, the clutch disc 51 separates from the flywheel 52 and connects the engine output shaft 31 and the transmission drive 11.
・Power transmission between 1tll152 is cut off.

Next, the configuration of the control circuit will be explained with reference to FIG.

56 detects the engine rotation speed by counting the number of pulses using ignition pulses or crank angle settings, and converts the voltage into a voltage using an F-V converter. be.

57 detects the number of rotations of the inertial mass body 640 by counting the number of pulses using a ring gear 67 coupled to this and an electromagnetic pickup (not shown), and converts it into voltage using an F-V converter. This is definitely a natural rod rotation signal.

The comparison 458 inputs the engine rotation signal 56 and the reference signal 59 corresponding to the engine stop state to determine whether the engine is stopped at the same time.
When stopped, a high level signal is output to the AND gate 67.

The comparator 60 inputs the engine rotation signal 56 and the inertial mass rotation signal 57, and outputs a high level signal to the AND gate 65 when the engine rotation speed is equal to or lower than the inertial mass rotation speed.

The comparator 61 receives the inertial mass body rotation signal 57 and the inertial mass body 34
A reference signal 62 corresponding to a predetermined rotation speed (for example, aoorpm) of the inertial mass body is inputted, and when the rotation speed of the inertial mass body exceeds the predetermined rotation speed, a high level signal is output to the AND gate 65.

Reference numeral 63 is an engine operating state detection circuit, which detects engine deceleration, idling state and acceleration, steady operating state, etc., based on detection signals such as the engine speed and its changes, throttle valve opening, clutch state, and transmission gear position. A high level signal is output to the AND gate 65 through the line 63a during deceleration and idle link. Further, only during idling, a high level signal is output to the at/to gate controller 6 through the line 65b.

-f71-The gate 65 receives a high level signal when all of the signals input from the comparators 60 and 61 and the signal input from the engine operating state detection circuit 63 through the line/66a are at high level. -1 output to AND gate 66. This high level signal is also output to the coil energization control circuit 7o via the inverter 69.

AND gate 66 outputs a high level signal to delay circuit 68 when both the signal input from AND gate 65 and the signal input from engine operating state detection circuit 63 through line 63b are at high level. Communication circuit 68
receives this high-level signal and starts a predetermined delay time (1 to 1).
After 2 seconds), an empty level signal is output to the engine stop circuit 71.

In response to this high-level signal, the 1-1 service stop/start circuit 71 shuts off the ignition circuit or fuel supply circuit (not shown).
Stop 1.

The start operation detection circuit 64 detects a series of operations performed by the driver to start the vehicle, such as depressing the clutch pedal, depressing the accelerator pedal, and engaging a gear, and... 67.

The AND gate 67 connects the comparator 58 and the start operation detection circuit 6.
When both input signals from 4 become high level, a high level signal is outputted to the engine stop circuit 71 and a high level signal is also outputted to the coil energization control circuit 70.

The coil energization control circuit 70 energizes the electromagnetic coil 46 when a high level signal is input, and cuts off the energization to the electromagnetic coil 45 when the input signal is at a low level.

Reference numeral 73 denotes a starting circuit for initial starting, which is constructed as follows.

74 is a cooling water temperature signal (or an oil temperature signal) output from the temperature sensor.

The comparator 79 inputs a cooling water temperature signal 74 and a reference signal 75 corresponding to a predetermined temperature (for example, -20°C) that serves as a reference for selecting direct starting or inertial starting. Outputs level signal. This output signal is directly input to the coil energization control circuit 70 and the comparator 80, and is input to the replica mold 81 via the inverter 85. This comparator 79 operates only when the engine is started by the driver's key operation.

Reference numeral 76 denotes a start signal that becomes high level when the engine is started by a key operation by the driver, and is output to the engine stop circuit 71 and the starting motor energization control circuit 86.

This start signal acts on the engine stop circuit 71 as a reset signal. When a start signal is input, the starting motor energization control circuit 85 energizes the starting motor 84 to operate it.

The comparator 80 operates only when the output of the comparator 79 is at a high level, and uses the engine rotation signal 56 and a reference signal (for determining whether or not the engine has started, for example, 350 r
Input the signal corresponding to pm) 77 and select 1. - When the number of rotations between grooves exceeds a predetermined number of rotations, a high/high level signal is output to the starting motor energization control circuit 86. The second level signal acts on the starting motor and the streetcar control circuit 86 as a reset signal.

When the output of the comparator 79 is low level, the comparator 81
It is activated by a high level signal obtained by inverting this output signal with an inverter 85. The comparator 81 receives the inertial mass body rotation signal 57 and the predetermined rotational speed of the inertial mass body (for example, 15
00 rpm) is input, and when the inertial mass rotation speed exceeds a predetermined rotation speed, a high level signal is output to the delay circuit 82 and the starting motor energization control circuit 83. This high level signal acts on the starting motor energization control circuit 85 as a reset signal. The operation of this embodiment in which the delay circuit 82 outputs a high level signal to the coil energization control circuit 70 after a predetermined delay time (03 to 05 seconds) upon receiving a high level input signal will be described below.

(a) When the cooling water temperature at initial startup is less than -20°C; When the start signal 76 becomes high level, this low level signal is output to the comparator 79, the engine stop circuit 71, and the starting motor energization control circuit 86. At this time, the output of the comparator 79 becomes low level because the cooling water temperature signal 74 is lower than the reference signal 75. Therefore, comparator 80 is not activated, but comparator 81 is activated by a high level signal obtained by inverting this low level signal by inverter 85. When the level signal is input to the starting motor energization control circuit 86, the starting motor 84 is energized, and the pinion 68 shown in FIG. 6 engages with the ring gear roller 7 to rotate the inertial mass body 64. At this time, since the electromagnetic coil 46 is not energized, the clutch disc 41 is separated from the clutch facing 69, and only the inertial mass body 54 is accelerated. When the rotation speed exceeds 1500rprf&, the output of the comparator 81 changes to a high level, and the starting motor energization control circuit 8
5 as a reset signal. This causes the starter motors 8 to stop operating. On the other hand, when a high level signal is input to the coil energization control circuit 70 after the delay time set in the delay circuit 82, the electromagnetic coil 46 is energized. As a result, the clutch disc 41 is attracted to the inertial mass body 64, and the rotational kinetic energy stored in the inertial mass body 64 is transmitted to the flywheel 32 via the clutch disc 41 to start the engine. At this time, the engine stop circuit 71 is reset by the start signal 76 and is in a state ready for starting.

When the cooling water temperature is -20°C or higher; In this case, when the start signal 76 reaches the... level, the comparator 79 outputs a 7. level signal, and this high level signal activates the coil energization control circuit 70 to turn off the electromagnetic coil. 46 is energized. Therefore, the inertial mass body 64
is connected to the flywheel filter 2 via the clutch disc 41.
The starting motor 84 operates while connected to the engine, and directly starts the engine with its rotational force. At this time, the comparator 80 operates to determine whether or not the engine has completed starting.

That is, the output of the comparator 80 is at a low level until the engine speed reaches 35 Orpm, and the starter motor 84 operates to continue cranking.
pm, the output of the comparator 80 changes to high level, and this high level signal is applied to the starting motor energization control circuit 86.
7J is input as a reset signal to the starting motor 8'.
4 stops operation↓.

When the start signal 76 changes to low level upon completion of starting the engine, the starting circuit 76 returns to the state before starting.

(b) Warm-up state υ0 speed and steady operation; At this time, the output of the AND gate 65 is low level,
Since the high-level signal is input to the coil energization control circuit 7o via the inverter 69, the electromagnetic coil 46 is energized, and the inertial mass body 34 rotates integrally with the flywheel 62.

During deceleration operation: When deceleration starts one mile (at this time, the engine rotation speed and the inertial frame rotation speed should be 800 rpm or more), the output of the AND gate 60, 61 and the line 6 filter of the engine operation state detection circuit 65 are activated. , are all at a high level, so the output of the AND gate 65 is also at a high level. Therefore, a low level signal is input to the coil energization control circuit 70 via the inverter 69, and the energization to the electromagnetic coil 43 is cut off.

Therefore, the inertial mass body 64 is disconnected from the flywheel 32 and freely rotates at damping.

During idle link operation: When the engine shifts from deceleration operation to idle link operation, the output of the line 63b of the engine operating state detection circuit 66 becomes ``E level'', so the output of the AND gate 66 changes to ``E level''. Due to this, the engine stop circuit 71 is activated after a delay time set in the delay circuit 68, and the operation of the engine 72 is stopped. At this time, the inertial mass body 64 continues free damping rotation.

When starting the vehicle: Since the engine has already stopped, the output of the comparator 58 is at a high level, and when the output of the starting operation detection circuit 64 becomes high level due to one starting operation by the driver, the AND gate 67 is activated. output changes to high level. The engine stop/output circuit 71 is reset by this level signal and becomes ready to start, and the coil energization control circuit 70 is activated to energize the electromagnetic coil 43, so that the inertial mass body 640
The rotational kinetic energy is transmitted to the flywheel 52 via the clutch disc 41 to start the engine.

In this respect, the dimensions are similar to the conventional example shown in Fig. 1.2.

The starting motor used in the above example has a tooth ratio (reduction ratio) of the pinion and ring gear of 1:4 to 6i degrees, which is smaller than the normal value (about 1:12), and has an inertial mass of This allows the engine to be driven at high speed, and even when starting directly with the starting motor, except at extremely low temperatures such as below -20°C, the smaller the reduction ratio, the faster the engine speed rises and the faster the engine starts. It takes less time and consumes less battery.

The above embodiment is a case in which the pinion and ring gear engage only when the starting motor is activated to transmit rotational force to the inertial mass body. However, if the starting motor is designed to withstand high-speed rotation, Alternatively, the rotor of the starting motor and the inertial mass body may be directly connected to form an integral structure.

As explained above, according to the present invention, at the time of initial startup, it is determined whether the engine temperature (cooling water temperature or oil temperature, etc.) is a predetermined temperature of 2 degrees or higher, and by controlling the energization to the electromagnetic coil for the clutch. When the engine temperature is above a predetermined temperature, the inertial mass body and the engine output shaft are rotated as a unit when the starting motor is activated to directly start the engine, and when the engine temperature is lower than the predetermined temperature, only the inertial mass body is rotated when the starting motor is activated. After increasing the speed to a predetermined speed, the inertial mass body is connected to the engine output shaft, and the engine is started using the kinetic energy accumulated in the inertial mass body, which is what is called inertial starting. As is clear from the above, the engine can always be started in the minimum amount of time regardless of temperature conditions, and the battery consumption is reduced.

Furthermore, as shown in the examples, if the above-mentioned inertial mass and clutch are used to restart the engine after a temporary stop,
Furthermore, it is possible to reduce running fuel consumption.

[Brief explanation of the drawing]

Fig. 1 is a sectional side view of a main part of a conventional example of a starting device using an inertial mass body, Fig. 2 is a circuit diagram thereof, and Fig. 6 is a sectional side view of a main part of a starting device according to the present invention. Figure 4 (al, fb)
are a front view of the leaf spring in Fig. 6 and its A-A analysis view, Fig. 5 is a circuit diagram of the starting pump according to the present invention, and Fig. 6 is a diagram showing the complete explosion of direct starting and inertial starting. It is a graph showing a comparison of the required time. 51 ・1=& output shaft 34...Inertial mass body 6
7 ・Ring gear 58 ・・Starting motor pinion 39 ・・Krano tip 41 ・Clutch disk 43 ・・Electromagnetic coil for clutch 70 ・・Coil energization control circuit 7 ・Starting circuit 79 ・・Engine temperature (cooling water temperature) at the time of starting is a predetermined temperature Comparator 8 to determine whether or not the above is true or not...Starting motor energization control circuit 84...Starting motor agent Patent attorney Junnosuke Nakamura, 11 Figure 2 Figure 4 (Q) et al. Figure (b)

Claims (1)

[Claims] The chopsticks are driven by a starter motor, and a first state in which the motor rotates freely relative to the engine output shaft, and a second state in which the motor rotates integrally with the engine output shaft are controlled by engaging and releasing the clutch. an inertial mass body that can be used as a selector; a means for determining whether or not the engine temperature at the time of starting is equal to or higher than a predetermined temperature; When the starting motor is operated, the engine 'f:M'f3 is operated with the inertial mass body in the second state, and when the engine temperature at the time of starting is lower than the predetermined temperature, the above when the starting motor is operated. Inertia'!!j After accumulating kinetic energy with the four bodies in the first state, the inertia body is in the second state.
1' characterized in that it includes circuit means for controlling energization to the electromagnetic coil for actuating the clutch so that the engine is started by the kinetic energy accumulated in the state and 1 to 1. Starting device.