JPH045440A - Exhaust valve device for internal combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an exhaust valve device for an internal combustion engine, and more specifically, the invention relates to an exhaust valve device for an internal combustion engine. The present invention relates to an exhaust valve device for an internal combustion engine.

[Prior Art] Some internal combustion engines installed in vehicles are equipped with an exhaust valve device. In this exhaust valve device, in order to prevent the exhaust valve from carbon sticking and malfunctioning, after the main power is turned on manually, it is initially activated by battery power to perform self-cleaning, and when the internal combustion engine is started, it is initially activated. The structure is designed to prevent

[Problem to be solved by the invention] In this way, the exhaust valve device performs self-cleaning by initially operating with battery power, but for example, in internal combustion engines installed in racing motorcycles, etc. Therefore, some models do not have batteries.

In this way, if a vehicle does not have a battery and the exhaust valve is initially activated by the power generated by the internal combustion engine, the conventional self-cleaning before starting the internal combustion engine is impossible, and the exhaust valve becomes carbon stick. This may cause malfunction.

For this reason, in vehicles that are not equipped with a battery, the internal combustion engine is initially activated after starting, but combustion is unstable immediately after starting, which further exacerbates the instability factor, leading to the engine stopping. It becomes a factor.

Furthermore, in the operation with a one-tempo delay when combustion after starting is stabilized, it is possible to start the engine during that time, so combustion cannot be achieved linearly with respect to the throttle opening, which may cause poor starting.

Furthermore, since sufficient voltage cannot be obtained at low revolutions in the idle revolution range, the motor operates slowly, and during this time it is possible to start, and as a result, combustion is not linear with respect to the throttle opening as described above. This can cause poor starting.

Furthermore, in operations above the idle speed range where the voltage is sufficiently increased, operations other than such blowing occur after the engine has started, causing problems such as not being able to obtain stable combustion and not being able to obtain smooth output.

This invention was made in view of the above circumstances, and provides an internal combustion engine that can initially operate the exhaust valve without adversely affecting the operation of the internal combustion engine, even in motorcycles etc. that are not equipped with a battery. The purpose is to provide an exhaust valve device.

[i! Means for Solving the Problems] In order to solve the above problems, the present invention provides an exhaust valve device for an internal combustion engine that operates the exhaust valve using power generated from power generation driven by the internal combustion engine without installing a battery in the vehicle. The present invention is characterized by comprising a start regulating means for regulating the start of the vehicle, and a control means for initially operating an exhaust valve in response to a start regulating signal from the start regulating means.

[Operation] According to the present invention, when the internal combustion engine mounted on the vehicle is in operation and the start of the vehicle is restricted, the exhaust valve is initially operated to perform self-cleaning. As a result, in a vehicle not equipped with a battery, the exhaust valve of the internal combustion engine initially operates, but at this time the vehicle is in a state where starting is restricted, and the operation of the internal combustion engine is not adversely affected.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

The drawing is a schematic view showing an exhaust valve device for an internal combustion engine, which is an embodiment of the present invention.

In the drawings, reference numeral 1 denotes a two-stroke internal combustion engine mounted on, for example, a motorcycle for competition, and this internal combustion engine 1 has a structure that reduces weight by not mounting a battery as a power source or a charging device to charge the battery. It has become.

The internal combustion engine 1 includes a cylinder block 2 and a cylinder head 3.
A combustion chamber 5 is defined by the piston 4, and a spark plug 6 is provided in the cylinder head 3.The spark plug 6 is ignited at a predetermined ignition timing by the operation of an ignition circuit 7. is controlled by a control device 8.

The piston 4 is connected to a crankshaft 10 via a connecting rod 9, and the reciprocating motion of the piston 4 rotates the crankshaft 10. Engine rotation speed detection means 1 from the crankshaft 10
1, the engine speed is detected, and this engine speed information is input to the control device 8.

An intake passage 12 is formed in the cylinder block 2, and a scavenging passage (not shown) is also formed therein, and a carburetor 13 having a throttle valve (not shown) is connected to the intake passage 12.

Further, an exhaust passage 14 is formed in the cylinder block 2, and a hemispherical exhaust valve 15 is provided in the exhaust passage 14. This exhaust valve 15 is operated by a motor 16, and the exhaust timing can be varied by operating this exhaust valve 15.

Motor 16 is controlled by control device 8 .

The control device 8 is connected to start regulating means for regulating the start of the vehicle, such as a neutral switch 17, sight stand switch 18, speedometer 19, and throttle fully closed detection means 20. The exhaust valve 15 is controlled by the control device 8 which is a control means.
The initial operation is performed.

This vehicle is not equipped with a battery and has an internal combustion engine.
is started by forcibly rotating the crankshaft 10. After this start, the clutch is released and the neutral switch 17 outputs a neutral signal, the side stand is down, the side stand switch 18 outputs a stand signal, the speedometer 19 is at zero speed, and the throttle fully closed detection means 20 outputs the throttle valve. If a start restriction signal for restricting the start of the vehicle is manually input from any point, such as when the motor 16 is fully opened, the motor 16 is driven by the control device 8. In this way, the exhaust valve 15 is initially activated to perform self-cleaning, thereby preventing the exhaust valve 15 from becoming stuck with carbon and malfunctioning.

[Effects of the Invention] As described above, the present invention includes a start regulating means for regulating the start of the vehicle, and a control means for initially operating the exhaust valve in response to a start regulating signal from the start regulating means. When the internal combustion engine installed in the vehicle is in operation and the vehicle is restricted from starting, the exhaust valve can be initially operated to perform self-cleaning. Therefore, although the exhaust valve of the internal combustion engine initially operates in a vehicle not equipped with a battery, the operation of the internal combustion engine is not adversely affected at this time.

[Brief explanation of the drawing]

The drawing is a schematic view showing an exhaust valve device for an internal combustion engine, which is an embodiment of the present invention. In the drawings, reference numeral 1 indicates an internal combustion engine, 8 indicates a control device, and 14
15 is an exhaust passage, 15 is an exhaust valve, 16 is a motor, 17 is a neutral switch, 18 is a side stand switch, 19 is a speedometer, and 20 is a throttle fully closed detection means.

Claims (1)

[Claims] In an exhaust valve device for an internal combustion engine that operates an exhaust valve using power generated from power generated by driving the internal combustion engine without having a battery installed in the vehicle, a start regulation means for regulating the start of the vehicle, and a start regulation from the start regulation means. 1. An exhaust valve device for an internal combustion engine, comprising: control means for initially operating an exhaust valve in response to a signal.