JP2581986Y2 - Vehicle starting device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting device for a vehicle, and more particularly to an improvement in a starting device in cold weather.

[0002]

2. Description of the Related Art It is well known that in cold weather, the cranking speed is reduced due to an increase in the viscosity of engine oil and a decrease in the capacity of a battery, and the startability of the engine is deteriorated.

[0003] For example, as shown in Japanese Utility Model Application Laid-Open No. 56-35661, an improvement of the suction air heating device is provided, and as shown in Japanese Utility Model Application Laid-Open No. 63-151974, for example, FIG.
As shown in FIG. 5, there is known a technique for increasing the voltage by connecting another battery in series at the time of starting and increasing the cranking speed, for example, as shown in FIG.

Japanese Patent Application Laid-Open Nos. Hei 2-259276, Hei 3-82836 and Hei 4-37873 disclose a technique of providing a capacitor charging circuit and starting using a capacitor and a battery. ing. However, if the operation can be started sufficiently without using a capacitor, it is useless to charge the capacitor, and the operation and handling are complicated.

[0005]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a starting apparatus for a vehicle which is easy to operate and can reliably start an engine using a capacitor only when necessary.

[0006]

According to the present invention, in a starting device for a vehicle in cold weather, a capacitor is provided between a battery and a starting motor, and a charging circuit for charging the capacitor from the battery; A switching device for switching from the charging circuit to the starting motor, and a control device for operating the switching switch is provided. The control device turns off the switching switch for charging the capacitor. Start the engine only with the battery without using the capacitor, and when the water temperature of the engine is not more than a certain value, turn on the preheating switch to preheat the intake air and turn on the changeover switch that charges the capacitor at the same time to charge the capacitor, When the voltage of the capacitor exceeds the upper limit, the changeover switch is turned off. ON the starter switch, OFF the starter switch if the engine starts and has a function to OFF the preheating switch.

[0007]

[Explanation of the operation and effect] Therefore, when the engine water temperature is higher than a certain value, it is determined that the engine is warmed up even in cold weather, and the engine is started without charging the capacitor. When the engine water temperature is low, that is, when the temperature is cold, the intake air is preheated, the capacitor is charged, and then the battery and the capacitor are connected in series to rotate the starter motor. The voltage is applied, the rotation speed is increased, and the startability of the engine is improved. The preheating switch, the changeover switch and the like are turned ON / OFF by the control device according to the judgment, so that the operation is extremely easy.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a starter G composed of a magnetic switch 2 and a temperature sensor 5 provided integrally with a starting motor 1 is connected to a positive electrode of a battery via a starter switch 3 and a normally closed magnetic switch A. Connected to the side.

The temperature sensor 5 provided in the starter G has a comparator D, a two-input AND 6 which outputs when two inputs are completed, and a three-input AND which outputs when three inputs are completed.
7 and a transistor 8 connected to the magnetic switch A.

A switch F for switching the capacitor 9 between the charging circuit and the starting motor is connected to both poles of the capacitor. One ends B1 and C1 of the magnetic switches B and C provided on the switch F are key switches 11 respectively. Is connected to the ignition (IG) side and the other end is grounded.

Further, both poles of the capacitor are respectively connected to the control circuit 10 and input both pole voltages of the capacitor to the control circuit.

Further, the ON side of the starter switch 3 is connected to the other ends of the coils of the magnetic switches B and C via a resistor, a Schmitt trigger 12 for sending an ON signal of the starter switch 3 and a two-input AND 13. At the same time, the midpoint between the Schmitt trigger 12 and the two-input AND 13 is connected to the control circuit 10.

The IG of the key switch 11 is connected to the control circuit 10 and to the control circuit 10 via a pilot lamp A which lights up when the capacitor can be discharged and a pilot lamp B for monitoring the voltage of the capacitor. .

The engine water temperature sensor 14 and the engine rotation sensor 15 are connected to a control circuit 10.

A two-input AND 6 is connected to the control circuit 10 to input a capacitor discharge enable signal, and a three-input AND 7 is connected to the control circuit 10 to input the engine speed and the engine coolant temperature.

On the plus side of the battery 4, an intake air preheating heater 17 is provided via a preheating heater switch 16. The preheating heater 17 is an electric circuit for inputting a heater ON signal to the control circuit, and is connected to the control circuit 10. The circuit is also connected to a magnetic switch D that charges a capacitor inside the control circuit 10.

The operation will be described with reference to FIG.

In operation, a key switch is first turned on (step S1). Next, the magnetic switch A is turned on, and the magnetic switch D included in B, C and the control circuit 10 for charging the capacitor 9 is turned off (step S2).

It is determined whether the engine water temperature is equal to or higher than a predetermined value (step S3). If YES, that is, if the water temperature is high, the normal start circuit is set (step S17), the starter switch 3 is turned on (step S18), the engine is cranked (step S19), and the starter switch 3 is turned off (step S20). Then, it is determined whether or not the engine has started (step S21). In the case of NO, control is returned, and in the case of YES, control ends.

In the above case, the engine is started only by the battery without using the capacitor.

If NO in step S3, the preheating switch 16 is turned ON to start preheating the intake air (step S3).
4) At the same time, the magnetic switch D in the control circuit is turned on by the signal (step S5), and the capacitor 9 is charged (step S6, the pilot lamp B is turned on with the brightness according to the terminal voltage of the capacitor).

It is determined whether the voltage of the capacitor is equal to or higher than the upper limit. If NO, return. If YES, turn off the magnetic switches A and D, turn on B and C (Step S8, pilot lamp A is lit), turn on the starter switch 3 (Step S9), and start the engine. Cranking is performed (step S10).

It is determined whether the voltage of the capacitor has fallen below the lower limit voltage (step S11). If NO, it is determined whether or not the engine has started (step S12). If NO, the process returns. If YES, the starter switch 3 is turned off (step S14, pilot lamp A is turned off).

If YES in step S11, the magnetic switch A is turned on, and B and C are turned off (step S13).

Turn off the magnetic switches B and C,
D is turned on (step S15), the preheating of the intake air is stopped (step S16), and the control is terminated.

FIG. 3 shows another embodiment of the present invention, in which the control circuit of the first embodiment is constituted by a microprocessor.
The control unit 24 excluding the input unit such as a sensor and a switch, the output unit such as a magnetic switch and a pilot lamp, and the output unit such as a starting motor is connected to the multiplexer 2.
0, A / D converter 21, digital I / O port (PIA) 22, communication I / F 23, RAM 25, ROM
26. The control method is basically the same as that of the first embodiment, and the control program is stored in the ROM 26.

More appropriate control can be performed as compared with the first embodiment.

[0029]

[Effects of the Invention] As described above, according to the present invention, the following excellent effects can be obtained. (A) Since the condenser is automatically used only when a large starting torque is required by detecting the stroke of the engine water temperature, it is suitable in cold weather. (B) Even when a capacitor is used, the capacitor is sufficiently charged before starting, and the stored energy of the capacitor can be reliably used at the time of starting. (C) Since the driver automatically performs the ON / OFF operation of the preheating switch and the changeover switch, the driving operation is easy. (D) Energy consumption is good because the required battery power is not consumed.

[0030]

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a control flowchart of FIG. 1;

FIG. 3 is a control circuit block diagram showing another embodiment of the present invention.

FIG. 4 is a diagram illustrating a conventional cold engine start circuit.

FIG. 5 is a diagram illustrating a relationship between a cranking speed and a start time.

[Explanation of symbols]

 F ... Changeover switch G ... Starter 1 ... Starting motor 3 ... Starter switch 4 ... Battery 5 ... Temperature sensor 9 ... Condenser 10 ... Control circuit 11 ... Key switch 12 ... Schmitt trigger 14 ... Engine water temperature sensor 15 ... Engine rotation sensor 17 ... Inlet air preheater

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-259276 (JP, A) JP-A-5-321798 (JP, A) JP-A-3-82876 (JP, U) JP-A-4- 37873 (JP, U) Japanese Utility Model Application Hei 6-29301 (JP, U) Japanese Utility Model Application 56-35561 (JP, U) Japanese Utility Model Application 63-151974 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) F02N 11/08 F02N 17/04 F02D 45/00 H02J 7/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A starting device for a vehicle in cold weather, wherein a capacitor is provided between a battery and a starting motor, a charging circuit for charging the capacitor from the battery, and a switch for switching the capacitor from the charging circuit to the starting motor. And a control device for activating the changeover switch is provided. When the changeover switch for charging the capacitor is turned off and the engine water temperature is equal to or higher than a predetermined value, the control device does not use the capacitor and operates the engine only with the battery. When the engine is started and the water temperature of the engine is not higher than a certain value, the preheating switch is turned on and the changeover switch for preheating the intake air and charging the capacitor at the same time is turned on.
N to charge the capacitor, and when the voltage of the capacitor exceeds the upper limit, turn off the changeover switch and turn on the starter switch, and if the engine is started, turn off the starter switch and turn off the preheating switch. A vehicle starting device having a function.