JPS6056262B2 - Automotive engine restart device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile engine restart device that automatically restarts an engine that has been stopped during deceleration or the like.

In order to improve the fuel efficiency of automobiles, a so-called deceleration fuel cut system is known that stops the supply of fuel during deceleration.In this case, when the engine speed reaches a certain low speed during deceleration, This prevents the engine from stalling by reconnecting the fuel supply.

However, if this engine stall is not taken into consideration, the effect of improving fuel efficiency will be further increased if the ignition is stopped and the fuel is kept cut during deceleration or idling when the vehicle is stopped.

Therefore, a device was proposed, as in Japanese Patent Publication No. 51-9085, which shuts off the ignition circuit and the fuel circuit during deceleration and automatically restarts the stopped engine using a starter motor. However, in this device, since the starter motor is activated each time the engine is restarted, the amount of power consumed by the battery increases, and as a result, the amount of power saved during deceleration is consumed during normal operation. In view of this, the present invention uses the engine to drive a flywheel called a starter wheel, and automatically restarts the engine, which has been stopped during deceleration or idling, by using the rotational energy of the starter wheel. In this manner, the present invention aims to provide a restart device for an automobile engine that improves fuel efficiency during deceleration and idling, and reduces restart energy.

Embodiments of the present invention will be described below based on the drawings.

In Figure 1, 1 is the engine body, 2 is the crankshaft, 3 is the flywheel integrally connected to the crankshaft 2, and 4 is arranged coaxially with the crankshaft 2, but the rotational driving force is directly transmitted. 5 is a clutch disk spline-coupled to this drive shaft 4;
6 is a spring for pressing the clutch disc 5 against the rotating side surface of the flywheel 3 and transmitting power to the drive shaft 4 via the clutch disc 5; 7 is a lever for releasing the pressing force of the spring 6 to connect and disconnect the clutch; , 8 is a clutch cover that is integrally attached to the flywheel 3 and also serves as a fulcrum for the spring 6, and up to this point it is substantially the same as a normal clutch mechanism. According to the present invention, the starter wheel 10 is positioned on the back surface of the flywheel 3 and is fitted to the crankshaft 2 as a second flywheel so as to be freely slidable in the axial direction by spline or key coupling. This starter wheel 1
A lever 11 for selectively press-fitting the flywheel 3 to the flywheel 3 is also arranged coaxially and constitutes an interrupting means.

The starter wheel 10 has a friction pad 12 near its periphery.
are integrally attached, and a one-way clutch 13 is interposed in the center thereof to transmit the rotation of the center rig part 15 to the main body ring part 14 in only one direction.

A spring 16 interposed between the starter wheel 10 and the flywheel 3 biases the starter wheel 10 away from the flywheel 3, so that the lever 1
The starter wheel 10 is pressed against the flywheel 3 only when the starter wheel 10 is driven by a hydraulic cylinder 18 using a protrusion 17 provided on the engine body 1 as a fulcrum.

An oil chamber 20 defined by the piston 19 of the hydraulic cylinder 18 is supplied with starter hydraulic pressure from a control circuit as shown in FIG. 2 at the time of restarting the engine, such as after deceleration.

In FIG. 2, 21A is a pickup that detects the rotation of the starter wheel 10 (however, the main body ring part 14);
22A is an F that converts the detected frequency into an analog voltage value.
-V converter, 23A is this F-V converter 22A
This is a comparator that compares the output of the starter wheel 10 with a reference value and turns on when the rotational speed of the starter wheel 10 is equal to or higher than a predetermined value (for example, 1000 to 1500 r'.P.m). Similarly, 21B is a pickup for detecting the rotation of the flywheel 3 (or crankshaft 2), 22B is the F-■ converter, and 23B is a pickup for detecting the rotation of the flywheel 3 (for example, 300 to 400 r.p. .m) Indicates a comparator that turns off when the above conditions are met.

When the first comparator 23A is on, it is excited via the battery 25 and the ignition switch 26,
A normally closed relay 27 that opens the contact 27a and a deceleration switch 28 that works in conjunction with an intake throttle valve (not shown) to fully close the throttle valve during idling and turn off during deceleration are arranged in parallel.
When both the relay 27 and the switch 28 are opened, the power supply current to the ignition circuit 30 and the fuel supply device 31 is cut off, and the ignition is stopped and the fuel is cut off.

At the same time, the normally closed relay 32 connected in series with the second comparator 23B opens its contact 32a as the relay 27 and switch 28 open.

When comparator 23B and relay 32 are both on,
A solenoid valve (normally open) 34 installed in a relief passage of a circuit that supplies pressure oil from the pump 29 to the hydraulic cylinder 18 is closed, and pressure oil is sent to the hydraulic cylinder 18.

From the above, when the rotation speed of the starter wheel 10 is higher than the set value during deceleration or idling, both the ignition circuit 30 and the fuel supply device 31 stop operating, and combustion of the engine is interrupted.

At the same time, the solenoid valve 34 also maintains the relief passage in an open state, so that the hydraulic cylinder 18 is released to a low pressure, and the starter wheel 10 is freely rotating independently of the flywheel 3. Therefore, during deceleration, etc., fuel is saved by cutting fuel.

This fuel cut etc. is performed regardless of the rotation of the crankshaft 2. Therefore, even if the crankshaft 2 stops, for example, the rotation of the starter wheel 10 will be below a predetermined value or the driver will not be able to accelerate. The fuel cut will continue as long as the pedal is not depressed.

In this respect, unlike the normal fuel cut during deceleration, which reconnects the fuel supply when the crankshaft rotational speed falls to a predetermined value, the effect of reducing fuel consumption is large. When the driver depresses the accelerator to start the vehicle from the fuel cut stage, the deceleration switch 28 is turned on and fuel supply and ignition are restarted. At this time, if the rotation of the crankshaft 2 is extremely low or has stopped, the engine would normally stall even if fuel is supplied, but in the present invention, the starter wheel 10 is driven at this time. It is possible to automatically restart the engine by applying force.

The starter wheel 10 is driven by the rotation of the crankshaft 2, but since the one-way clutch 13 is interposed, when the rotation speed of the crankshaft 2 becomes lower than the rotation speed of the starter wheel 10, it begins to rotate independently.
Even if the automobile stops and the rotation of the crankshaft 2 stops, the high rotation can be maintained for a while using the energy stored before then.

Therefore, when the start operation is started, the relay 32 is turned on and the solenoid valve 34 is energized (because the rotation of the crankshaft 2 is low and the comparator 23B is also on), and the hydraulic cylinder 1 is turned on.
8 is supplied with pressure oil.

As a result, the lever 11 rotates counterclockwise in FIG. 1 via the piston 19, presses the starter wheel 10 onto the flywheel 3, and transmits rotational force to the crankshaft 2. As a result, the engine is forcibly driven by the starting force of the starter wheel 10, and since the fuel supply has been restarted at this time as described above, the engine is automatically restarted.

In this case, unlike conventional devices that use a starter motor, power consumption does not increase and the energy consumption for restarting is extremely low.

By the way, if the rotational speed of the starter wheel 10 drops below the scheduled speed during fuel cut, it will be difficult to restart the next time, but in such a case, the output of the comparator 23A will be turned off and the contact 27a of the relay starter wheel 10 without pressing the accelerator pedal.
The engine restarts automatically before the engine speed drops too low.

Furthermore, if the rotation speed of the crankshaft 2 is higher than the set value when fuel supply is restarted (for example, when reaccelerating after deceleration), the comparator 23B is turned off and the solenoid valve 34 does not close. starter wheel 10
And the flywheel 3 is not crimped.

This is because when the rotational speed of the crankshaft 2, in other words, the flywheel 3, is sufficiently high, the engine can be easily started using the rotational energy of these components without having to connect the starter wheel 10.

Similarly, if the rotational speed of the crankshaft 2 increases beyond the set value after restarting, the connection of the starter wheel 10 is cut off. As described above, according to the present invention, the engine is completely stopped during deceleration or idling, and the engine is restarted using the rotational energy of the starter wheel. This has the effect of preventing the release of exhaust gas.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a control circuit diagram thereof. 2...Crankshaft, 3...Flywheel, 10...Starter wheel, 13...
...One-way clutch, 18...Hydraulic cylinder, 21A, 21B...Pickup, 23
A, 23B... Comparator, 27...
Normally closed relay, 28...Deceleration switch, 32...
... Normally open relay, 34 ... Solenoid valve.

Claims (1)

[Claims] 1. A starter wheel to which the rotation of the engine crankshaft is transmitted via a one-way clutch, an intermittent means for selectively transmitting the rotation of the starter wheel to the crankshaft, a means for detecting deceleration and idling operation states, and a means for detecting the rotation of the starter wheel. and a means for stopping the operation of the engine when the rotational speed of the starter wheel is decelerated or idling when the rotational speed of the starter wheel exceeds a reference value, and when deceleration or idling is canceled, the intermittent means is connected to start the engine by the rotational force of the starter wheel. An automobile engine restart device characterized in that: