JPS63272962A - Automatic start device for vehicle engine - Google Patents

Abstract

PURPOSE:To simplify the constitution and the like by judging the start of an engine via the sudden rise of the voltage of a vehicle battery on the start of an alternator due to engine start, and stopping a starter motor depending upon the result of the judgement. CONSTITUTION:When an ignition switch 4 is closed, a charge lamp 3 lights and voltage from a capacitor 16 for voltage differentiation is charged to the voltage of a battery 5. Then, when a starter switch 12 is closed, power supply voltage is applied to a comparator 8 and voltage divided by voltage division resistors 9 and 10 is applied to the input terminal of a negative pole side. And the output of the comparator 8 drops and the contact point of a relay 11 closes, thereby actuating a starter motor 7. On the other hand, when an engine starts, the voltage of the battery 5 rises quickly and the voltage division resistors 9 and 10 operate to raise the output of the comparator 8. As a result, the contact point of the relay 11 opens and the starter motor 7 stops.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a device for automatically starting a vehicle engine.

Conventional technology Conventional automatic engine starting devices for vehicles are known, for example, from the "New Automotive Engineering Handbook" edited and published by the Society of Automotive Engineers of Japan.
Part 7 Chapter 1 "Equipment" 4.6.2 "Starter protection device" There is a method of activating the safety relay with the voltage generated by the generator to automatically cut off the starter switch circuit.

FIG. 4 shows an example using a conventional method. When the ignition switch 4 is closed, the engine has not started yet, so there is no output from the alternator 1 (charge lamp 3).
lights up.

Next, when the starter switch 12 is closed, the power supply voltage is applied to the comparator 8, the low voltage side of the charge lamp a is applied to the + side input terminal, and the voltage obtained by dividing the battery voltage by resistors 9 and 10 is applied to the - plane input terminal. Since the values of resistors 9 and 10 are set so that this divided voltage is higher than the low voltage side of charge lamp 3, the output of comparator 8 becomes low level, the contact of relay 11 closes, and starter motor 7 Start.

When the engine starts after starting the starter motor 7, voltage is output from the alternator 1 and the charge lamp 3 is turned off to eliminate the potential difference. -10, the voltage to the + side input terminal of the comparator 8 is higher than the - input terminal, so the output of the comparator 8 becomes high impedance, the contact of the relay 11 opens, and the starter motor 7 stops.

Problems to be Solved by the Invention In the conventional method described above, it is necessary to connect the low voltage side of the charge lamp in addition to the electro-hydraulic voltage to the engine automatic starting device.

However, it is not easy to connect the charge lamp to the low voltage side because the vehicle generally does not have a special connector or the like. When wiring directly from the alternator, the wiring is from the engine room, which has severe conditions such as temperature and humidity, to the passenger compartment where the automatic engine starting device is placed, and the lead wire is long, wire processing, shielding between the engine room and the passenger compartment, etc. There are particular problems with temperature and humidity resistance.

In addition, if the engine does not start for some reason such as the fuel system or intake system stopping after the negative engine has started, and the engine shaft rotates by inertia, the output of the alternator will be small, so the + side of the comparator 8 will be one side. lower (becomes, the output of comparator 8 becomes low level and relay 1
Contact point 1 closes and starter motor 7 operates. Therefore, strain is placed on the meshing mechanism between the engine and starter motor, overrunning clutch, etc., causing wear, damage, and noise.

Means for Solving the Problem As shown in Fig. 3, there is a difficult problem in wiring.The low voltage side of the charge lamp 3 is not used, and the voltage of the battery 5 is not connected to the starter motor as shown in Fig. 2. The voltage rises rapidly when the engine starts, and is comprised of a circuit that detects this voltage rise, a circuit that holds the output of the detection circuit, and a starter motor drive circuit.

Operation In FIG. 3, when the ignition switch 4 is closed and then the starter switch 12 is closed, the starter motor rotates and the voltage of the battery 5 drops as shown in FIG. 2, but when the engine starts, it quickly rises. This rising is detected, the starter motor is stopped, and the stopped state is maintained.

Example FIG. 1 shows an embodiment of the invention.

When the ignition switch 4 is closed, the charge lamp 3 lights up, and the voltage differentiation capacitor 16 is charged to the battery voltage through the voltage differentiation resistor 15. Next, when the starter switch 12 is closed, the flH9j voltage is applied to the comparator 8, and the voltage divided by the voltage dividing resistors 9 and 10 is applied to the negative input terminals.

On the other hand, Ov is applied to the + side input terminal because the tortoise pressure differential capacitor has already been charged to the battery voltage.

Therefore, the output of the comparator 8 becomes low level, and the contacts of the relay 11 are closed, and the starter motor 7 is activated. At this time, the battery voltage drops, but the operating conditions of the comparator 8 do not change. At this time, the voltage differentiating capacitor 16 is discharged through the diode 17 until the voltage across it reaches Vl - IDv, which is expressed using vl in FIG. (10 = 1 diode) When the engine starts, the battery voltage rises rapidly, and the voltage at the + side input terminal of comparator 8 becomes
If expressed using Vl and V in the figure, the voltage will rise to V3-V1+IDv, and the voltage dividing resistors 9 and 10 are set so that the input voltage at the - input terminal is smaller than the above-mentioned input voltage, so the comparator 8 The output becomes high level, the contact of the relay 11 opens, and the starter motor 7 stops. Since the high level output of the comparator 8 is connected to the + side input terminal through the positive feedback resistor 1a, the comparator 8 is maintained at a high level output.

Effects of the Invention There is no need for a lead wire connected to the low voltage side of the charge lamp to detect the output of the alternator, and the device is easy to install because it only needs to be connected to the power source of the battery inside the vehicle. No need for wiring to the engine room, so reliability and safety are guaranteed! 1st center I7 is more expensive and the cost can be lowered.

Further, even if the engine stops operating after the main engine has started, the starter motor will not start, thereby preventing wear, damage, and noise of the meshing mechanism between the engine and the starter motor, the overrunning clutch, and the like.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of an automatic starting device for a vehicle engine showing an embodiment of the present invention, Fig. 2 is a voltage characteristic diagram of a battery in the starting device, and Fig. 3 is a block diagram of the starting device. FIG. 4 is an electrical circuit diagram of a conventional automatic starting device. 1...Alternator, 5...Battery, 7...Starter motor. Name of agent: Patent attorney Toshio Nakao and 1 other person6-
0. Engine official working position t6---Electric 5 service use gongden length 1 Figure 1---Ichishita tl-11 When starter switch is ON t2---1st engineering〉Jin Ai work scrap stirrup t3--- − g When selling υ−−−脣≦starvation υ,−−−SD data 7−DA operation w14) Voltage HT'zr
, s-mo/-11 alternator 3...-charge lamp 4-11 ignition switch 5-reliever 6--1 engine evening fin movement en 1 7---starter moder 12---starter adjuster I8- m-Voltage top 4 detection circuit tq --- Shaved Toriwa! -・-Olda Fuyuki 7---Sudada Motor 2---Electronic Bontote Light AI Rator
8---Cooper radar meter - Chimage lamp
9--1 partial pressure ear sail 4--Ig31 solution switch 10-"5-m-battery
1l---1) Sea 6---engine ship WAI
L 12 --- Starter switch Figure 4 Procedural amendment (method) % formula % 1 Display of case 1986 Patent application No. 106669 2 Name of invention Automatic starting device for vehicle engine 3 Person who makes correction ( ′ [Relationship with Patent application
Colonel Tokoro 1006 Kadoma, Kadoma City, Osaka Prefecture
Name (582) Matsushita Electric Industrial Co., Ltd. Representative Akio Tanii 4 Agent 571 Address 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 6 Date of amendment order 7, No. 7 of the detailed statement of amendments We will correct page 7 as shown in the attached sheet.

Claims (1)

[Claims] This is an automatic starting device for a vehicle engine that operates a starter motor for the engine upon receiving a command to start the engine, and stops the starter motor at the same time as the engine starts. A change is detected in which the voltage of the vehicle battery, which has decreased due to current supply to the motor compared to when the starter motor is not operating, suddenly increases to the output voltage of the alternator due to the start of the alternator due to the engine starting. An automatic starting device for a vehicle engine, characterized in that it determines that the engine has started and stops the starter motor.