JPH0953556A - Glow lamp controller - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a glow lamp control device having good startability and capable of controlling to display a glow lamp in a minimum time. [Structure] When the ignition switch is turned on, it is determined in step 101 that the ignition switch is turned on, the process proceeds to step 102, and the counter is counted. Next, in steps 104 and 105, A / D
The power supply voltage and the water temperature that have been A / D converted by the converter 10 are read. The voltage read in step 106
The glow lamp energization target time is calculated from the water temperature. The glow lamp is turned on until the time after the ignition switch is turned on counted in step 102 exceeds the calculated energization target time. Ignition switch is ON
If not, the glow lamp is turned off when the time after the ignition switch is turned on exceeds the calculated energization target time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glow lamp control device.

[0002]

2. Description of the Related Art When an internal combustion engine is started, the voltage value input to an electronic control unit rises differently depending on the environment surrounding the vehicle. Delay). For example, there is a glow lamp that is controlled based on the voltage value of the power supply after the power is turned on and before the internal combustion engine is started. This glow lamp is provided in a system for improving startability of an internal combustion engine by controlling a glow plug that preheats the internal combustion engine. In this system, the glow plug is energized to improve the starting performance of the internal combustion engine from the time the ignition switch is turned on until the internal combustion engine is started (pre-glow control), and to improve the drivability of the internal combustion engine even after the internal combustion engine is started. Then, energization control is performed (afterglow control). Here, in addition to the energization control of the glow plug, the glow lamp is calculated based on the water temperature and the power supply voltage, and the time estimated that the glow plug is expected to be in a state in which a good start is possible is calculated. It is controlled so as to be turned on (displayed) during the calculated time. Conventionally, the ON time of the glow lamp has been determined by looking at the water temperature and the power supply voltage once immediately after the ignition switch is turned on, or once after a predetermined time has passed after the ignition switch is turned on.

[0003]

However, as described above, the way the input power supply voltage rises differs depending on the state of the power supply (battery), so the power supply voltage is detected and turned on when the power supply has not risen sufficiently. Since the time is calculated, it is necessary to set the ON time in accordance with the latest possible rise time of the detected power supply voltage. Therefore, the ON time set in this way is longer than the time from when the ignition switch is actually turned ON until a good start is possible (preheating control state before start in the present invention) in the normal rising manner. turn into.

On the other hand, there is a demand for the driver to start the internal combustion engine as soon as possible after turning on the ignition switch, and the ON time of the glow lamp must be shortened as much as possible. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a glow lamp control device capable of displaying a glow lamp at an optimum time equal to the minimum time with good startability in order to solve the above problems.

[0005]

In order to solve the above problems, the present invention provides a glow lamp for indicating whether or not the internal combustion engine is in a preheating control state before starting, and a power source used for preheating the internal combustion engine. Voltage detection means for detecting a voltage, measurement means for measuring the time after the power supply voltage is turned on for preheating the internal combustion engine, and voltage detection means at a predetermined timing after the power supply voltage is turned on. Calculating means for calculating the display time of the glow lamp after the power supply voltage is turned on based on the power supply voltage, and the time measured by the measuring means does not exceed the display time calculated by the calculating means. And a glow lamp control means for controlling the glow lamp to display a pre-start preheating control state, and the predetermined timing is in the pre-start preheating control state. Are more set in the calculating means is to provide a glow lamp control apparatus characterized by re-calculating the display time of the glow lamp for each of the plurality of predetermined timings.

Water temperature detecting means for detecting the water temperature of the cooling water used for cooling the internal combustion engine is provided, and the calculating means is
The preheating pre-start control time for the internal combustion engine may be calculated at a predetermined timing based on the power supply voltage and the water temperature detected by the water temperature detecting means. The calculation of the display time by the calculating means may be carried out every predetermined time.

The display time calculated by the calculating means may be longer when the power supply voltage is lower than when it is high. The display time calculated by the calculating means may be longer when the water temperature is low than when it is high.

[0008]

According to claim 1 of the present invention having the above structure,
The display time of the glow lamp is calculated based on the power supply voltage at multiple preset timings while the internal combustion engine is in the preheating control state, and the time since the power supply voltage was turned on exceeds the calculated display time. The glow lamp is displayed while not in use.

According to the second aspect of the present invention having the above structure, the display time of the glow lamp is calculated based on the water temperature in addition to the power supply voltage. According to claim 3 of the present invention having the above configuration, the predetermined timing is set at predetermined time intervals. According to claim 4 of the present invention having the above configuration, the display time when the voltage is low is set longer than the display time when the voltage is high.

According to the fifth aspect of the present invention having the above structure, the display time when the water temperature is low is set longer than the display time when the water temperature is high.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a glow lamp control device according to the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a glow lamp control device according to the present invention. The controller 1 of FIG. 1 is an ignition switch (IG
The glow lamp control device obtains information from the SW), the battery, and the water temperature sensor, and controls ON / OFF of a glow lamp (not shown) based on the information.

A glow plug 16 is provided in each cylinder of the internal combustion engine to improve the controllability of the internal combustion engine (diesel engine), and preheats the internal combustion engine using a battery as a power source. The CPU 11 takes in information on the water temperature detected by the water temperature sensor, and turns on / off the glow plug relay 17 via the output interface 15 according to the taken-in water temperature value.
Is turned on / off to control the energization of the glow plug 16 supplied from the battery. Before starting the glow plug 16, it is necessary to preheat the internal combustion engine so as to raise the temperature of intake air to some extent, thereby enabling a good start of the internal combustion engine. Therefore, for example, the CPU 11 sets the glow plug 16 to be energized for a relatively long time when the water temperature is relatively low before starting, and to make the glow plug 16 a relatively short time when the water temperature is relatively low. It controls the plug 16.

The glow lamp described above is the glow plug 1
6 is for displaying the preheating control state before the start of the internal combustion engine from when the IG SW is turned on to when the internal combustion engine can be started satisfactorily. In other words, when this glow lamp is turned on, it indicates that the internal combustion engine is being preheated by the glow plug (not shown), and is turned on even though the IG SW is turned on and the power is turned on. During that time, a good start is not possible. When it is OFF, it indicates that it is not in the pre-heating preheat control state, and it is one of the startable state, the start state in which the starter switch is ON, the normal control state after the start, and the IG SW OFF state. Is the state of.

When an IG SW (not shown) is turned on,
The CPU 11 in the microcomputer 2 determines that the IG SW is turned on via the input interface circuit 4 and the input port 9 in the microcomputer 2. At the same time, a signal indicating that the IG SW is ON is input to the main relay control circuit 5, so that the main relay 3 is turned ON, and a battery (not shown) and the power supply circuit 6 are electrically connected. The main relay control circuit outputs O of the main relay 3 based on the signal sent from the microcomputer 2 in addition to the ON / OFF signal of the IG SW.
Control N / OFF. CPU11 is IG SW
Since it is necessary to execute processing such as opening / closing control of the throttle valve even after turning off the
This is because the power needs to be supplied to 11. Therefore, even after the IG SW is turned off, the main relay 3 continues to be turned on by the software by the CPU 11, and power is supplied to the microcomputer 2. And IG SW is OFF
After the processing after the completion is completed, the main relay 3 is turned off through the main relay control circuit 2.

When the main relay 3 is turned ON from OFF, power is input to the input interface 7 which is composed of a filter composed of resistors and capacitors. While the main relay 3 is turned on, the power supply voltage supplied from the main relay 3 is blunted and analog / digital converted (A / D converted) by the A / D converter 10 in the microcomputer 2. In addition to this power supply voltage, the A / D converter 10 inputs a signal from a water temperature sensor (not shown) to perform A / D conversion.

The microcomputer 2 includes a RAM 12, R
The OM13 is provided, and the CPU 11 has an A / D converter 10
Take in the A / D converted water temperature and power supply voltage at
The energization target time (display time) is calculated based on the program and data stored in M13, and the energization control of the glow lamp is performed through the output port 14 in the microcomputer 2 and the output interface 15. As described above, the time during which the glow plug 16 is energized before starting is controlled so as to be longer when the water temperature is low than when it is high. Therefore, the energization control of the glow lamp is also low. When it is high, it is controlled to be longer than when it is high. When the power supply voltage is low, the glow plug 16 has a small amount of heat for preheating, so that the glow lamp is energized for a longer time than when it is high.

FIG. 2 is a flow chart showing the characteristics of this embodiment in the processing by the CPU 11. This flowchart detects the power supply voltage and water temperature after IG ON at predetermined timings, calculates the energization target time of the glow lamp according to the detected power supply voltage and water temperature, and calculates the glow lamp according to the calculated energization target time. ON / OFF is controlled.

Next, the details of this flowchart will be described. This flowchart starts execution after IGSW is turned on or after it is reset.
Until the main relay 3 is turned off through the main relay control circuit 5 after the processing after the SW is turned off, the processing is performed at a predetermined timing (every 98.3 ms in this embodiment).

First, at step 101, it is judged from the input port 9 whether or not the IG SW is ON. IGS
When W is not turned on (OFF), the routine proceeds to step 110, where the IG SW is turned off and then turned on.
The counter that has been counted since the state of (3) is cleared, and the glow lamp is turned off via the output port 14 and the output interface 15. This counter is for measuring the time (IG ON time) from when the IG SW is turned off to when it is turned on.

When the IG SW is turned on, it is determined in step 101 that the IG SW is turned on, the process proceeds to step 102, and counting by the counter is executed (measuring means). Next, in step 104, the power supply voltage A / D converted by the A / D converter 10 is read (voltage detection means), and in step 105 the A / D converter 10 outputs A / D.
The water temperature of the cooling water for cooling the internal combustion engine, which has been / D converted, is read (water temperature detecting means). And in step 106,
A glow lamp energization target time (display time) is calculated from the read voltage and water temperature (calculation means). In this embodiment, the glow lamp energization target time is from the time when the IG SW is turned on to the time when a good start is possible when the preheating control of the glow plug 16 is continued under the condition of the read power supply voltage and water temperature. It's time. This glow lamp energization target time is determined based on the map. An example of the relationship between the power supply voltage and the power supply voltage correction coefficient set in this map and the relationship between the water temperature and the water temperature correction energization time are shown in FIGS. 3 and 4. In this embodiment, the water temperature correction energization time obtained based on the water temperature is multiplied by the power supply voltage correction coefficient calculated based on the power supply voltage to calculate the glow lamp energization target time.

(Glow lamp energization target time) = (Power supply voltage correction coefficient) * (Water temperature correction energization time) This glow lamp energization target time is before the start by the glow plug 16 when the water temperature is low as compared with when it is high. It is calculated that the preheating control time becomes longer because the preheating control time becomes longer, and the preheating control time by the glow plug 16 becomes longer when the power supply voltage is low even when the water temperature is the same as when it is high. Therefore, as shown in FIG. 4, the water temperature correction energizing time is set to be longer when the water temperature is low than when it is high. Further, as shown in FIG. 3, the power supply voltage correction coefficient is set so that the water temperature correction energization time calculated based on the water temperature becomes shorter as the power supply voltage becomes lower even at the same water temperature. Specifically, in this embodiment, the power supply voltage correction coefficient is 2.3 when the power supply voltage value is 7 V or less, as shown in FIG.
1.3 at 9 V, 1. 11 V or more and less than 16 V
Further, although not shown in FIG. 3, it is set to 0 (not energized) when the voltage is 16 V or higher. As shown in FIG. 4, the water temperature correction energization time is 4000 ms when the water temperature is less than -15 ° C, 1500 ms when the water temperature is 17 ° C, 500 ms when the water temperature is 40 ° C or more and less than 60 ° C, and 0 ms when the temperature is 60 ° C or more.
It is set to (not energize).

Based on the glow lamp energization target time thus calculated in step 106, it is determined in step 107 whether the IG ON time counted in step 102 is longer than the glow lamp energization target time. . That is, at step 107, it is judged if the IG ON time has passed the glow lamp energization target time or more. If the IG ON time does not exceed the glow lamp energization target time, the glow lamp is turned ON via the output port 14 and the output interface 15, and the IG ON
When the time has passed the glow lamp energization target time or more, the glow lamp is turned off and the processing of this time is ended (the above is the glow lamp control means).

Next, the operation of the flow chart of FIG.
(1) IG SW state (O
N or OFF), (2) Input interface circuit 7
Power supply voltage read through, (3) glow lamp communication
Power target time, (4) IG ON time, and (5) Global
-Explain the lamp status (ON or OFF)
You. Here, when the IG SW is OFF (time
t₀), IG ON time after IG SW is turned on
Until the glow lamp energization target time has elapsed or more (time t
₁From time t₂), IG ON time is Gloran
When the target time for energization has elapsed (time t_Three) 3 places
I will explain it separately.

When the IG SW is OFF (time t ₀ ): While the main relay 3 is ON, the process of the flowchart of FIG. 2 is not executed. Further, even if the main relay 3 is turned on, in the flowchart of FIG. 2, it is determined that the IG SW is not turned on in step 101, so the routine proceeds to step 110, where the count for counting the IG ON time is cleared and step At 109, the glow lamp is turned off.

Therefore, when the IG SW is OFF in (1), the glow lamp is not turned ON (5). Also IG ON
Not measured time (4), glow lamp current target time (3) not be calculated (until time t _1). After the IG SW is turned on until the IG ON time exceeds the glow lamp energization target time (from time t ₁ to time t ₂ ): When the IG SW is turned on (time t ₁ ) in ( ₁ ), the input interface The power supply voltage read from the circuit 8 gradually rises (2). Then, the processing of this flowchart is started and executed at predetermined timings. This IG ON time (4) is measured, the glow lamp energization target time (3) is calculated based on the power supply voltage and the water temperature, and the glow lamp is turned on.
The ON time is executed until the glow lamp energization target time or more has passed (time t ₂ ).

Therefore, after the IG SW is turned on (time t
₁ ), the glow lamp is turned on until the IG ON time exceeds the glow lamp energization target time (time t ₂ ) (5). The glow lamp energization target time is calculated at predetermined timings based on the power supply voltage and the water temperature. When the IG ON time has exceeded the glow lamp energization target time (time t ₃ ): Although the power supply voltage still rises (time t ₂ to time t ₃ , (2)), the IG ON time (4) in step 107. Is judged to have exceeded the glow lamp energization target time (3), the glow lamp is turned off (5).

Therefore, after the IG ON time has passed the glow lamp energization target time (time t ₂ ), the glow lamp is turned off even when the power source voltage rises because the preheating control before starting the internal combustion engine is completed. As in the present embodiment, the glow lamp energization target time is calculated by detecting the power supply voltage and the water temperature at every predetermined timing, and the glow lamp ON / OFF control is executed based on the glow lamp energization target time. As a result, the glow lamp can be optimally controlled for various rises in the power supply voltage.

In the above embodiment, IG SW is OF.
The glow lamp was controlled to be turned off when F or the IG ON time has passed the glow lamp energization target time. In addition to this, the glow lamp is controlled to be turned off when the starter SW is turned on. You may.

[0029]

According to the present invention, a plurality of predetermined timings are set during the preheating control state before starting the internal combustion engine,
The glow lamp display time after power is turned on is calculated based on the detected power supply voltage, and the time measured after the power supply voltage is turned on for preheating the internal combustion engine must be within the calculated display time. By displaying on the glow lamp that it is in the preheating control state before starting, it is possible to display the glow lamp in a minimum time with good startability.

Further, the display time can be calculated more accurately by calculating the display time based on the water temperature.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a glow lamp control device according to the present invention.

FIG. 2 is a flowchart showing the features of the present invention.

FIG. 3 is a diagram showing a relationship between a power supply voltage and a power supply voltage correction coefficient.

FIG. 4 is a diagram showing a relationship between a water temperature and a water temperature correction energizing time.

FIG. 5 is a time chart showing the operation of the flowchart of FIG.

FIG. 6 is a diagram corresponding to claims of the present invention.

[Explanation of symbols]

 1 Controller 2 Microcomputer 3 Main Relay 4 Input Interface Circuit 5 Main Relay Control Circuit 6 Power Supply Circuit 7 Input Interface Circuit 8 Input Interface Circuit 9 Input Port 10 A / D Converter 11 CPU 12 RAM 13 ROM 14 Output Port 15 Output Interface 16 Glow plug 17 Glow plug relay

Claims (5)

[Claims] 1. A glow lamp for displaying whether or not the internal combustion engine is in a preheating control state before starting, voltage detection means for detecting a power supply voltage used for preheating the internal combustion engine, and for preheating the internal combustion engine. Measuring means for measuring the time after the power supply voltage is turned on, and a glow lamp after the power supply voltage is turned on, based on the power supply voltage detected by the voltage detection means at a predetermined timing after the power supply voltage is turned on. Calculating means for calculating the display time of, and while the time measured by the measuring means does not exceed the display time calculated by the calculating means, the glow lamp is controlled to be in a pre-heating preheating control state. And a glow lamp control means for displaying, and the predetermined timing is set to a plurality while the pre-heating preheating control state, the calculating means, the plurality of Glow lamp control apparatus characterized by re-calculating the display time of the glow lamp for each constant timing. 2. A water temperature detecting means for detecting a water temperature of cooling water used for cooling the internal combustion engine, wherein the calculating means is based on the power supply voltage and the water temperature detected by the water temperature detecting means and has a predetermined timing. The glow lamp control device according to claim 1, wherein the preheating control time before starting of the internal combustion engine is calculated by. 3. The glow lamp control device according to claim 1, wherein the calculation of the display time by the calculation means is performed every predetermined time. 4. The glow lamp control device according to claim 1, wherein the display time calculated by the calculating means is longer when the power supply voltage is lower than when the power supply voltage is high. 5. The glow lamp control device according to claim 2, wherein the display time calculated by the calculating means is longer when the water temperature is low than when it is high.