JPS5823274A - Adjusting device of ignition timing in engine - Google Patents

Abstract

PURPOSE:To correct power down at highland running, in an engine provided with an altitude correction device in which an air quantity is adjusted by a pressure sensing bellows, by relating a variable resistor for adjustment of ignition timing to the pressure sensing bellows. CONSTITUTION:At level land running under high atmospheric pressure, a pressure sensing bellows 2 is not in an extended state, and a slider 8 is placed in a position of the largest resistance value to cause a resistance value maximum between a terminal 15 of CDI generating coils 10, 11 and terminal 16 of a CDI unit 12, then a device is operated in normal ignition timing. As a vehicle is driven toward highland, the atmospheric pressure goes down, and the pressure sensing bellows 2 is extended to increase a feed quantity of air to a carburetor, while the resistance value is decreased to advance the ignition timing. In this way, output power down of an engine can be corrected at highland running.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition timing adjustment device for an engine.
The ignition timing is changed in conjunction with the operation of the carburetor's altitude correction device, and when the vehicle goes to a high altitude and the atmospheric pressure drops, the ignition timing is advanced by one to compensate for the decrease in output.

When a vehicle such as a motorcycle is equipped with an engine whose output and carburetor are set on level ground, and the vehicle is driven at high ground (altitude 1,000 meters or higher),
Changes in atmospheric pressure will cause the carburetor to be set too rich, resulting in a significant drop in output. Therefore, an altitude correction device that is connected to a vaporizer to solve this problem has been developed. Although this altitude correction device is eliminating overconcentration in the carburetor setting, it is inevitable that the output will decrease due to atmospheric pressure.

The present invention has been made in view of this point.

One embodiment of the present invention will be explained with reference to FIG. 1. Reference numeral 1 denotes an altitude correction device, which uses a pressure-sensitive bellows 2 to move a rod 3 according to the atmospheric pressure, and moves a rod 3 from an air cleaner 4 to a main system 6 of a carburetor 5. The air flow rate to the idle system 7 is changed. A slider 8 is attached to the rod 3 and comes into sliding contact with a resistor 9 provided near the rod 3 to form a variable resistor. In the case of this embodiment, when the pressure-sensitive bellows 2 expands due to a decrease in atmospheric pressure, the resistance value between the slider 8 and one end of the resistor 9 changes in the direction of decreasing (see Figure 2). .

10.11 is the CDI generator coil, 12 is the CDI unit.

13 is an ignition coil, and 14 is a spark plug. In the case of this ignition device, the ignition timing can be changed by changing the resistance value between terminals 15 and 16. Specifically, the smaller the resistance value, the earlier the ignition timing becomes. Therefore, when the pressure-sensitive bellows 2 is expanded because the vehicle is traveling at a high altitude, the ignition timing is automatically advanced.

This device configured in this way operates as follows. First, when the vehicle is running on level ground, the air pressure is high, so the pressure-sensitive bellows 2 does not expand, and the slider 8 is located in a place with a high resistance (Fig. 2 ■), so the ignition timing is at the normal timing. It operates with. As the vehicle moves toward higher ground, the air pressure decreases, so the pressure-sensitive bellows 2 stretches, increasing the amount of air supplied to the carburetor 5, and decreasing the resistance value (
(Fig. 2 ■), the problem will occur if the ignition timing is too early. Then, when the atmospheric pressure further decreases, the resistance value becomes zero (Fig. 2 ■) and the ignition timing becomes the earliest. In this way, the output down is corrected.

Since the present invention is configured as described above, it is possible to automatically adjust the ignition timing in addition to the conventional carburetor setting, so that it is possible to compensate for the decrease in output when driving at high altitudes.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention, FIG. 2 is a graph 27 showing the state of change in resistance value. J... Altitude correction device 2...Pressure sensitive bellows 5.--vaporizer 8...Slider 9...Resistor 10.11・-・CDI generator coil 12...CDI unit

Claims (1)

[Claims] (1) In an engine equipped with an altitude correction device that uses a pressure-sensitive bellows to change the amount of air supplied to the carburetor, the ignition timing is changed by changing the resistance value, and a variable-speed control system is used to change the resistance value. An ignition timing adjustment device for an engine, characterized in that a resistor is linked to the pressure-sensitive bellows.