JP2000179394A - Solenoid valve driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a start detection device that can be easily mounted, and can accurately detect engine start. SOLUTION: Battery voltage is sampled at predetermined intervals after a predetermined time has lapsed (steps 100, 105). Previous sample voltage and a new sample voltage are compared, and if the new sample voltage exceeds the previous one for X times or more consecutively, it is judged that the engine has started (steps 115, 130, 135). After the judgement, driving of the sel motor is stopped (step 150). Before a new sample exceeds the previous one for X times, if the difference between a new sample voltage and a sample voltage of a times before exceeds a predetermined value ΔV, it is judged that the engine has started (steps 140, 145). After the judgement, driving of the sel motor is stopped (step 150).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a start detecting device for starting an engine by a motor connected to a battery, determining start of the engine, and stopping driving of the motor.

[0002]

2. Description of the Related Art Conventionally, there has been known a start detecting device which starts an engine by a wireless or timer type engine starting device, determines that the engine has started, and stops driving of a starter motor. As such a start detecting device, a device that detects an output voltage of an AC generator driven by an engine and determines that the engine has been started is known.

As shown in FIG. 8, the battery voltage E1 after the engine is started is detected to be slightly higher than the battery voltage E0 before the engine is started, so that it is determined that the engine is started. Since the AC generator operates after the start, the AC component ΔE is superimposed on the battery voltage. There is also known a device that detects this and determines that the engine is started.

[0004]

However, such a conventional method for detecting the output voltage of an AC generator requires a wiring connection or the like for detecting the output voltage of the AC generator. There was a problem that it was difficult.

In the battery voltage comparison between before and after starting, if the current consumption of the battery driving an air conditioner, a heating wire, a glow, or the like is large, a sufficient voltage change is not detected. There was a problem that the start of the diesel engine could not be determined. Further, in the case of detecting that the AC component is superimposed on the battery voltage, there is a problem that accurate detection may be difficult due to the influence of noise generated by other electric components.

SUMMARY OF THE INVENTION An object of the present invention is to provide a start detecting device which can be easily mounted and can accurately detect the start of an engine.

[0007]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, in a start detection device that starts an engine by a motor connected to a battery, determines the start, and stops driving of the motor, a start determination unit that determines an engine start from an increase in the battery voltage after the motor is driven. This is a start detection device characterized by comprising:

In a start detecting device for starting an engine by a motor connected to a battery and judging the start and stopping the driving of the motor, a sampling means for sampling the battery voltage at a predetermined cycle; And a start determination means for determining the start of the engine based on the start.

The start determination means may compare the previous sampling voltage with the current sampling voltage, and determine that the engine is started when the previous sampling voltage continuously exceeds the previous sampling voltage by a predetermined number of times. Or,
The start determination means may determine that the engine is to be started when a difference between a current sampling voltage and a sampling voltage before a predetermined time exceeds a predetermined value. Furthermore,
A first start determination unit that compares the previous sampling voltage with the current sampling voltage and determines that the engine is to be started when the previous sampling voltage continuously exceeds the previous sampling voltage by a predetermined number of times; And a second start determining means for determining that the engine is started when the difference between the sampling voltage and the sampling voltage before the predetermined time exceeds a predetermined value.

[0010] A timer means for starting the sampling by the sampling means after a predetermined time has elapsed may be provided. Further, the second start determination means is configured to control the first start
Even before the start determination unit determines that the engine is started, the engine may be determined to be started when the difference between the current sampling voltage and the sampling voltage obtained a predetermined number of times exceeds a predetermined value.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, 1 is a transmitter placed near the user, 2 is a receiver mounted on a vehicle, and when the receiver 2 receives a start signal from the transmitter 1, the receiver 2 Outputs a start signal to the electronic control circuit 4. The electronic control circuit 4 includes a well-known CPU 6, ROM 8, RA
An input / output circuit 12 configured to perform input / output with the outside is connected to each other via a common bus 14.

The CPU 6 inputs a signal from the outside such as the receiver 2 through the input / output circuit 12. On the other hand, based on these signals, the data in the ROM 8 and the RAM 10 and a control program stored in advance, the CPU 6 determines the start of an engine (not shown), and outputs a drive signal via the input / output circuit 12 based on the determination. I do.

The input / output circuit 12 is connected to the base of a transistor 18 via a resistor 16, and the emitter of the transistor 18 is grounded. The collector of the transistor 18 is connected to the coil 20 of the relay, and the other end of the coil 20 is connected to the battery 22. When the coil 20 is excited, the accessory contact 24 is closed, and the accessory electrical equipment (not shown) mounted on the vehicle and the battery 22 are connected.

The input / output circuit 12 is connected to the base of a transistor 28 via a resistor 26, and the emitter of the transistor 28 is grounded. The collector of the transistor 28 is connected to the coil 30 of the relay, and the other end of the coil 30 is connected to the battery 22. When the coil 30 is excited, the ignition contact 3
2 is closed, and the battery 22 is connected to an engine ignition circuit, a fuel injection circuit, and the like (not shown).

Further, the input / output circuit 12 is connected to the base of a transistor 38 via a resistor 36, and the emitter of the transistor 38 is grounded. The collector of the transistor 38 is connected to the coil 40 of the relay, and the other end of the coil 40 is connected to the battery 22. When the coil 40 is excited, the starter contact 42 closes, the cell motor 44 and the battery 22 are connected, and the cell motor 44 is driven to rotate.

On the other hand, the battery 22 is connected to voltage-dividing resistors 48 and 50 via a diode 46, and the divided voltage is applied to an analog-to-digital conversion circuit 54 (hereinafter referred to as an analog-to-digital converter) via a protection resistor 52 for limiting an input current. , A / D conversion circuit 54
Connection).

The noise of the voltage signal input to the A / D conversion circuit 54 is suppressed by the noise suppressing capacitor 56, and the voltage limiting diode 58 for limiting the voltage signal to be lower than the power supply voltage and the voltage do not become negative. A voltage limiting diode 60 is provided. Further, the electronic control circuit 4 is connected to receive power supply from the battery 22 via the stabilized power supply circuit 62.

Next, control processing performed in the electronic control circuit 4 will be described with reference to the flowchart of FIG. First, when a start signal is transmitted from the transmitter 1, the receiver 2 receives and demodulates the modulated radio wave and inputs the demodulated ID code to the electronic control circuit 4 via the input / output circuit 12. The CPU 6 uses an ID stored in the ROM 8 in advance.
The code is compared with the demodulated ID code.

If they match, a high level signal is output to the transistor 18 via the input / output circuit 12. Thereby, the accessory contact 24 is closed, and the accessory electrical equipment and the battery 22 are connected. Further, a high level signal is output to the transistor 28, the ignition contact 32 is closed, and the ignition circuit, the fuel injection circuit, etc. are connected to the battery 22. Subsequently, a high-level signal is output to the transistor 38, the starter contact 42 is closed, and the starter motor 44 and the battery 22 are connected to rotate the starter motor 44. At that time, open the accessory contact 24,
The load on the battery 22 is reduced.

As a result, the starter motor 44 is driven to rotate, and the processing shown in FIG. 2 is executed. In this process, first, the counter n is initialized to 0 (step 1).
00), the timer is driven for T seconds (for example, 0.1 to
A standby process is executed (about 0.2 seconds) (step 10).
2) After the elapse of T seconds, the voltage Dn obtained by sampling the voltage of the battery 22 input via the A / D conversion circuit 54 at a constant period (t seconds) is stored in the RAM 10 (step 105).

Next, it is determined whether or not the sampling number n has reached a preset number of Y times (step 1).
10) If the number has not reached Y times, the previous sampling voltage Dn-1 is compared with the current sampling voltage Dn (step 115). Previous sampling voltage Dn-1
Is greater than or equal to the current sampling voltage Dn, the counter m is cleared to 0 (step 120),
One is added to the counter n (step 125), and the processing from step 105 onward is repeated.

As shown in FIG. 3, when an engine (not shown) is started by the starter 44, the voltage E of the battery 22 fluctuates. When the cylinder of the engine is in the compression process, the load on the starter motor 44 is large, so that the voltage E of the battery 22 decreases. On the other hand, when the cylinder of the engine is in the explosion process, the load on the starter motor 44 is light, so the voltage E of the battery 22 increases. Until the engine is started, the voltage of the battery 22 pulsates, and when the engine is started, the load on the starter motor 44 is reduced and the battery 22
Voltage E continues to rise.

The sampling period t seconds is set to a time sufficiently shorter than the period of the voltage pulsation before starting. As a result, the sampling voltage Dn also increases or decreases in accordance with the pulsation, so that during the pulsation, the current sampling voltage Dn may be smaller than the previous sampling voltage Dn-1.

If it is determined that the current sampling voltage Dn is higher than the previous sampling voltage Dn-1 by executing the processing of step 115, 1 is added to the counter m (step 130). Then, it is determined whether or not the counter m has reached X times which is a predetermined number of times set in advance (step 135).
Is the predetermined number of times Z (where X> Z)
Is determined (step 140). yet,
When the counter m has not reached Z times, the processing from step 125 on is executed. Note that X, Y, and Z may be determined in advance in accordance with the characteristics of the engine through experiments and the like.

On the other hand, when the counter m has reached Z times, it is determined whether the value obtained by subtracting the sampling voltage Dn-a a times before the current sampling voltage Dn from the current sampling voltage Dn is greater than a predetermined value ΔV. (Step 14
5). If it is smaller than the predetermined value ΔV, step 125
Repeat the following process. Note that the predetermined value ΔV may be variable according to the outside air temperature, the battery voltage, and the like.

If the state in which the current sampling voltage Dn is higher than the previous sampling voltage Dn-1 continues for X times during the repetition of the processing of steps 105 to 135, it is determined that the engine has been started by the starter motor 44. When it is determined, the starter contact 42 is opened to turn off the starter motor 44 and the accessory contact 24 is closed (step 150).

That is, as shown in FIG. 3, when the engine is started, the load on the starter motor 44 is continuously reduced.
When the current sampling voltage Dn is higher than the previous sampling voltage Dn-1 continuously for X times, it is determined that the engine has started, and the starter motor 44 is stopped.

On the other hand, as shown in FIG. 4, before X times, counters m
Has reached Z times, if it is determined that the value obtained by subtracting the sampling voltage Dn-a a times before the current sampling voltage Dn from the current sampling voltage Dn is greater than a predetermined value ΔV, it is determined that the engine has been started, The starter 44 is stopped (step 150).

Further, as shown in FIG.
At this time, the sampling voltage Dn
When the value obtained by subtracting the previous sampling voltage Dn-a does not become larger than the predetermined value ΔV, and the current sampling voltage Dn does not become larger than the previous sampling voltage Dn-1 continuously for X times, the counter is executed. When n reaches Y times (step 110), it is determined that the engine could not be started, and the accessory contact 24, the ignition contact 32, and the starter contact 42 are closed (step 155).

In this embodiment, the execution of the processing in step 102 functions as a timer, and the execution of the processing in step 105 functions as a sampling means. In addition, execution of the processing of steps 115, 130, and 135 functions as first start determination means, and execution of the processing of steps 140 and 145 functions as second start determination means.

In the above-described embodiment, the start of the engine is determined by the digital circuit. However, the start of the engine can be determined by the analog circuit. Next, a second embodiment using this analog circuit will be described with reference to FIGS. Comparator 7 for comparing voltage (A) of battery 22 with voltage (B) smoothed by filter 70
2, the comparator 72 outputs a high-level signal (C) when the voltage (A) of the battery 22 exceeds the smoothed voltage (B).

Then, when the high-level signal (C) continues for T seconds or more by the T-second retrigger one-shot multi 74, it is determined that the engine has started, and the low-level signal (D) is output. Even if the starter 44 is stopped based on this signal, the present invention can be similarly implemented.

The present invention is not limited to such an embodiment at all, and can be implemented in various modes without departing from the gist of the present invention.

[0034]

As described in detail above, the start detection device of the present invention determines the start of the engine from a rise in the battery voltage, and is therefore easily installed. Further, by determining the start of the engine based on the sampling voltage of the battery, the start can be reliably determined without being affected by noise or the like.

Further, by determining that the engine is to be started when the current sampling voltage continuously exceeds the previous sampling voltage by a predetermined number or more, the determination can be reliably performed without being affected by pulsation. Further, by determining that the engine is started when the difference between the current sampling voltage and the sampling voltage before the predetermined time exceeds a predetermined value, the determination can be reliably performed without being affected by the pulsation.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a start detection device as one embodiment of the present invention.

FIG. 2 is a flowchart illustrating an example of a control process performed in the electronic control circuit according to the embodiment.

FIG. 3 is a graph showing a change in battery voltage when a current sampling voltage continuously exceeds a previous sampling voltage by a predetermined number of times or more in the present embodiment.

FIG. 4 is a graph showing a change in battery voltage when a difference between a current sampling voltage and a sampling voltage before a predetermined number of times in this embodiment exceeds a predetermined value.

FIG. 5 is a graph showing a change in battery voltage when it is determined that the engine is not started in the embodiment.

FIG. 6 is a schematic configuration diagram of a start detection device as a second embodiment.

FIG. 7 is a graph showing a change in battery voltage according to the second embodiment.

FIG. 8 is a graph showing changes in battery voltage and self-motor voltage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transmitter 2 ... Receiver 4 ... Electronic control circuit 12 ... I / O circuit 24 ... Accessory contact 32 ... Ignition contact 42 ... Starter contact 44 ... Cell motor 54 ... Analog-to-digital conversion circuit 72 ... Comparator 74 ... T-second retrigger one Shot multi

Claims (7)

[Claims] 1. A start detecting device for starting an engine by a motor connected to a battery, determining the start, and stopping the driving of the motor, wherein the engine start is determined based on a rise in the battery voltage after the driving of the motor. A start detection device comprising start determination means. 2. A start detecting device for starting an engine by a motor connected to a battery, judging the start and stopping the driving of the motor, wherein a sampling means for sampling the battery voltage at a predetermined cycle; And a start determination means for determining the start of the engine based on the start of the engine. 3. The engine according to claim 1, wherein said starting determination means compares a previous sampling voltage with a current sampling voltage, and determines that the engine is started when the previous sampling voltage continuously exceeds the previous sampling voltage by a predetermined number of times. Item 3. The start detecting device according to Item 2. 4. The start detection device according to claim 2, wherein the start determination means determines that the engine is started when a difference between a current sampling voltage and a sampling voltage obtained a predetermined number of times exceeds a predetermined value. . 5. A first start determining means for comparing the previous sampling voltage with the present sampling voltage, and determining that the engine has started when the previous sampling voltage continuously exceeds the previous sampling voltage by a predetermined number of times. 3. The start detection device according to claim 2, further comprising: second start determination means for determining that the engine is started when a difference between a current sampling voltage and a sampling voltage obtained a predetermined number of times exceeds a predetermined value. 6. The start detecting device according to claim 2, further comprising timer means for starting the sampling by said sampling means after a predetermined time has elapsed. 7. The method according to claim 6, wherein the second start determination unit determines that the difference between the current sampling voltage and the sampling voltage obtained a predetermined number of times before the first start determination unit determines that the engine has started. 7. The start detecting device according to claim 5, wherein it is determined that the engine is started when the engine speed exceeds the predetermined value.