JP3550854B2 - Engine automatic stop / start device - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION
The present invention relates to a device for automatically stopping and starting an engine, and more particularly to a device for automatically stopping and automatically starting (restarting) an engine when a predetermined condition is satisfied in a vehicle such as an automobile.
[0001]
[Prior art]
In general, when the vehicle travels in an urban area, the vehicle may stop at an intersection, a railroad crossing, or the like. In such a case, idling of the engine at this time consumes fuel, so that the fuel consumption rate decreases.
[0002]
For this reason, the engine is stopped when certain conditions are satisfied, such as when the vehicle stops, to reduce the fuel consumption during a temporary stop, and then automatically restarts the engine when the predetermined conditions are satisfied. Automatic stop / start devices have already been proposed.
[0003]
FIG. 5 shows stop conditions and start conditions in such an automatic engine stop / start device.
[0004]
First, regarding the condition for automatically stopping the engine, the following eight items are required simultaneously as shown in FIG.
(1) The vehicle speed is about 0 km / h.
(2) The engine speed is substantially equal to or less than the idle speed (the speed at which no air is blown) 800 rpm.
(3) The gear is neutral.
(4) The clutch pedal is not depressed.
(5) The coolant temperature of the engine must be 40 ° C or higher.
(6) Air pressure is 64 kPa or more.
(7) A vehicle speed of 10 km / h or more has been detected since the system was turned on.
(8) No failure was found by the failure diagnosis.
[0005]
That is, (1) the vehicle is stopped, (2) the engine is idling, (3) the gear is neutral, (4) the clutch pedal is not depressed, (5) the engine is warm, (6) sufficient air pressure in the air tank for the air cylinder (indicated by reference numeral "12" in FIG. 1) for automatic engine stop; (7) at least one vehicle run has been confirmed; 8) When the engine automatic stop condition that there is no failure is satisfied, the engine is automatically stopped by closing the intake shutter (indicated by reference numeral "13" in FIG. 1) by the above air cylinder and closing the intake of the engine, thereby wasting waste. It aims to reduce exhaust gas and noise by consuming less fuel.
[0006]
On the other hand, after the engine is automatically stopped as described above, the conditions for restarting the engine are as shown in FIG.
(9) The engine speed is 0 rpm,
(10) gear neutral;
(11) The clutch is depressed, and three well-known items are required at the same time.
[0007]
[Problems to be solved by the invention]
In this way, the engine automatic stop / start system can reduce fuel consumption and reduce exhaust gas and noise by eliminating idling operation.However, this requires certain conditions. Otherwise, fuel consumption may not be reduced and may worsen.
[0008]
That is, when the engine stop period is short, the fuel consumption at the next start of the engine may be superior.
[0009]
For example, when the fuel consumption is 0.5 cc / sec and the amount of starting increase is 2.5 cc / times during idling, 2.5 / 0.5 = 5, and if the engine is not stopped for 5 seconds or more, it does not contribute to improvement in fuel efficiency. Will be.
[0010]
For example, in the engine automatic stop / start device disclosed in Japanese Patent Publication No. Hei 5-26018, the ratio of the automatic stop time to the total travel time is determined, and a scale indicating how much fuel economy can be saved with respect to the normal travel is obtained. However, even if the period during which the engine is not stopped for more than 5 seconds is added up as described above, this does not mean that fuel economy has been saved, and it is not possible to provide appropriate driving guidance to drivers and operation managers. was there.
[0011]
Therefore, the present invention relates to an automatic engine stop / start device that automatically stops the engine when a predetermined stop condition is satisfied and automatically starts the engine when another predetermined start condition is satisfied. An object of the present invention is to be able to provide data when a driving instruction is given to a driver or an operation manager on how appropriately a stop state contributes to fuel efficiency.
[0012]
In the present invention, the time when the controller performs the automatic stop is measured , the measured value is determined to which of the sections divided by the time width belongs, and the number of times of the automatic stop is determined for each of the sections by the EEPROM. And output it to an external device.
[0013]
That is, if the automatic stop time of the engine is classified and measured as, for example, 5 seconds or less or 30 seconds or less, as described above, it is determined whether the automatic stop that cannot reduce fuel consumption has been performed as described above. since either is to be output to the external device, it is possible to narrow down the causes of deterioration of fuel consumption, data for proper operation guidance to the driver or service administrator will be able to provide.
[0014]
In the present invention also has a vehicle speed detecting means, that the controller of the vehicle speed detected by the vehicle speed detecting means, and time measurement for each segment is divided by the vehicle speed width, and outputs the measured value to the output equipment Is also possible.
[0015]
In other words, by classifying the vehicle speed into a plurality of predetermined ranges and measuring the time by the vehicle speed detection means, it is possible to determine whether or not the road on which the vehicle travels is congested, and to provide driving guidance for further improving fuel efficiency. It can be performed even more effectively.
[0016]
Further, in the present invention, an engine speed detecting means is provided, and the controller measures the time of the engine speed detected by the engine speed detecting means for each section divided by the engine speed width , and measures the measured value. it is also possible to output to the output devices.
[0017]
That is, if the engine speed is considered in addition to the automatic stop time and the vehicle speed as described above, it is possible to narrow down the factors of the fuel efficiency deterioration related to the driving operation state of the driver.
[0018]
For example, when the number of revolutions of the engine used is high or low, the latter is more advantageous for fuel efficiency. As a result, it is possible to narrow down the factors of the fuel consumption deterioration in relation to the engine speed, so that more effective driving guidance is provided to the driver and the operation manager.
[0019]
Note that a set switch for automatic stop time and the vehicle speed and display switching engine rotational speed is outputted to the output equipment to the controller, it is possible to display the data in each predetermined range.
[0020]
Alternatively, the above measurement result may be stored in the EEPROM when the power of the controller is turned off from ON, and the data stored in the EEPROM may be deleted by a data deletion switch.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an embodiment of an engine automatic stop / start device according to the present invention. In the drawing, reference numeral 1 denotes a vehicle speed sensor as a means for detecting a vehicle speed from rotation of a disk gear 1a mounted on wheels, for example. For example, an engine speed sensor as a means for detecting the engine speed from the rotation of a disc gear 2a attached to the crankshaft of the engine, and 3 as a clutch detecting means for detecting whether or not the clutch pedal CP is depressed. A clutch switch, 4 is a neutral switch as a means for detecting a neutral position of a gear by the shift lever SL, 5 is a cooling water temperature sensor as a means for detecting a cooling water temperature of the engine ENG, and 6 is a sensor for detecting the air pressure of the air tank 10. It is an air pressure sensor as a means.
[0022]
Reference numeral 7 denotes a controller, an input port 71 for receiving output signals of the sensors 1, 2, 5 and 6, and output signals of the switches 3 and 4, and receiving the output signal of the input port 71 and storing it in a memory (ROM). A central processing unit (hereinafter, referred to as a CPU) 72 interconnected with a memory (RAM) 74 in accordance with the control program to perform data processing, and an output port 75 for sending an output signal of the CPU 72 to the outside. ing.
[0023]
Reference numeral 11 denotes an electromagnetic valve (M / V), which supplies air from the air tank 10 to the air cylinder 12. Reference numeral 13 denotes an intake shutter for stopping intake of the engine ENG by the air from the air cylinder 12 to stop the engine ENG. Reference numeral 14 denotes a starter motor for starting the motor based on an output signal from the output port 75.
[0024]
As an embodiment unique to the present invention, an EEPROM (Electrically Writable / Erasable Fixed Storage Element) 76 is connected to the CPU 72, a display 77 is connected to an output port 75, and an input is further provided. The select switch 78 is connected to the port 71.
[0025]
Further, a data erasing switch 20 is provided, and the data erasing switch 20 is connected to an input port 71 of the controller 7.
[0026]
FIG. 2 shows a flowchart of a control program stored and executed by the CPU 72 shown in FIG. 1, and is particularly for measuring the automatic stop time. Hereinafter, the operation of the embodiment of FIG. 1 will be described with reference to this flowchart.
[0027]
First, when the power of the controller 7 is turned on (step S1), the CPU 72 of the controller 7 takes in data from the EEPROM (step S2).
[0028]
It is assumed that no data is stored in the EEPROM 76 at first.
[0029]
Next, after confirming that the power has been turned on (step S3), the CPU 72 executes the same automatic engine stop / start control as in the prior art as described with reference to FIG. 5 (step S4).
[0030]
However, the CPU 72 sets the flag F1 when performing an automatic stop (not shown) in this step S4, and resets the flag F1 when performing automatic start.
[0031]
Thereafter, the CPU 72 determines whether the flag F1 described in step S4 is ON or OFF (step S5). If it is determined that the automatic stop / start control of the engine has not been performed in the present state, the flag F1 is determined. Since the flag remains OFF, the process proceeds to step S11 to determine another flag F2. However, since this flag F2 is also initially OFF, various steps described later are skipped and the process proceeds to step S21.
[0032]
In this flowchart, the automatic stop / start control of the engine is not performed even when the vehicle is running normally, so that the flow is similarly executed.
[0033]
On the other hand, when the engine is automatically stopped in step S4, the flag F1 is set, so the process proceeds from step S5 to step S6, where the flag F2 is turned on (step S6), and the timer T1 is started. (Step S7).
[0034]
Then, in a step S8, it is determined whether or not the timer T1 has reached one second.
[0035]
Here, since the flowchart shown in FIG. 2 is executed at a cycle of, for example, about 20 ms, by repeating this flowchart about 50 times, one second of timer T1 elapses at step S8. Is reset (step S9).
[0036]
When the timer T1 indicates that one second has elapsed, that is, when it is determined that the automatic stop state of the engine has elapsed for one second, the automatic stop parameter Time is incremented by "1" (step S1). S10), and proceed to step S21.
[0037]
On the other hand, if the flag F1 is reset in step S4 after the engine is restarted, the process proceeds from step S5 to step S11. However, since the flag F2 is already ON (step S6), the process further proceeds to step S12. After the flag F2 is cleared once, the process proceeds to steps S13 to S15.
[0038]
These steps S13 to S15 are for determining whether or not the above-mentioned parameter Time is “5 seconds or less”, “30 seconds or less”, and “60 seconds or less”, respectively. When it is determined that the data is "1", the process proceeds from step S13 to step S16, and the automatic stop data DATA [1] to be stored in the memory 74 is incremented by "1".
[0039]
If it is determined that the parameter Time is equal to or longer than 5 seconds but equal to or shorter than 30 seconds, the process proceeds to step S17, where data DATA [2] is incremented by "1" (step S17). However, when it is determined that the time is less than 60 seconds, the data DATA [3] is incremented by "1" (step S18), and when it is determined that the parameter Time exceeds 60 seconds, the data DATA [4] is increased. The value is incremented by "1" (step S19), and the process proceeds to step S20, where the parameter Time is cleared and the process proceeds to step S21.
[0040]
In this manner, four types of automatic stop data DATA [1] to [4] (hereinafter, may be collectively referred to as [N]) are written in the memory 74, and these data DATA are stored in the memory 74. For display, if the driver or the operation manager selects the select switch 78, the corresponding data is displayed on the display 77.
[0041]
That is, for example, that the automatic stop time is displayed data in the range of 5 to 30 seconds on the display 77 by pressing the corresponding button of the select switch 78 when it is desired to display the data DATA (2) obtained in step S17 Become.
[0042]
Then, in step S22, it is determined whether the data erasing switch 20 is on or off. When the switch 20 is off, the process returns to step S3 to repeat this routine. become.
[0043]
When the power of the controller 7 is turned off, the program proceeds from step S3 to step S24, so that the data DATA [N] in the memory 74 is written into the EEPROM 76.
[0044]
Then, when the data in the EEPROM 76 is to be erased, the data erase switch 70 is turned on to erase all the data DATA [N] as shown in step S23.
[0045]
In the above embodiment, the select switch 78 is provided to display either of the data DATA [N]. However, when this switch is pressed using a simple switch instead of the select switch 78, the memory 74 is displayed. May be displayed on the display 77.
[0046]
In this way, by dividing the automatic stop time of the engine into several ranges and measuring the respective integrated times, it is possible to obtain data in which the cause of the deterioration of the fuel efficiency is narrowed down. The time can be measured in consideration of the vehicle speed and the engine speed as shown in FIG.
[0047]
First, regarding the vehicle speed shown in FIG. 3, the flowchart of FIG. 3 can be connected to the flowchart of FIG.
[0048]
That is, after measuring the automatic stop time as shown in FIG. 2, the vehicle speed is set to “0 km / h”, “1 to 10 km / h”, “11 to 20 km / h” in steps S 31 to S 36, respectively. The determination is made for "21 to 30 km / h", "31 to 40 km / h", and "41 to 50 km / h".
[0049]
As a result, when it is determined that the vehicle speed obtained from the vehicle speed sensor 1 is 0 Km / h (stop state), the timer T2 is started in step S37, and step S37 is performed in the same manner as steps S6 to S10 shown in FIG. Step S40 is executed.
[0050]
That is, when it is determined in step S31 that the vehicle is stopped, the vehicle speed data DATA [5] is incremented by "1" using the timer T2 and stored in the memory 74.
[0051]
When it is determined in step S32 that the vehicle speed is 1 to 10 km / h, the vehicle speed data DATA [6] is incremented by "1" by using the timer T3 in steps S41 to S44 and stored in the memory 74.
[0052]
When it is determined in step S33 that the vehicle speed is 11 to 20 km / h, the vehicle speed data DATA [7] is incremented by "1" using the timer T4 in steps S45 to S48 and stored in the memory 74.
[0053]
When it is determined in step S34 that the vehicle speed is 21 to 30 km / h, the vehicle speed data DATA [8] is incremented by "1" using the timer T5 in steps S49 to S52 and stored in the memory 74.
[0054]
When it is determined in step S35 that the vehicle speed is 31 to 40 km / h, the vehicle speed data DATA [9] is incremented by "1" using the timer T6 in steps S53 to S56 and stored in the memory 74.
[0055]
When it is determined in step S36 that the vehicle speed is 41 to 50 km / h, the vehicle speed data DATA [10] is incremented by "1" using the timer T7 in steps S57 to S60 and stored in the memory 74. Is greater than or equal to 50 Km / h, the vehicle speed data DATA [11] is incremented by "1" using the timer T8 in steps S61 to S64 and stored in the memory 74.
[0056]
Also in this case, the vehicle speed data DATA [5] to [11] are written to the EEPROM 76 when the power is turned off (step S25).
[0057]
After executing these steps, the process returns to step S3 in FIG. 2, and by repeating the flowcharts in FIGS. 2 and 3, the time for the vehicle speed range in addition to the automatic stop time can be measured. Thus, it is possible to obtain data that narrows down the causes of fuel consumption deterioration including whether or not the current road conditions are congested.
[0058]
When it is desired to perform time measurement in consideration of the engine speed shown in FIG. 4, the flowchart of FIG. 4 can be connected to the flowchart of FIG. 2 or can be executed following the flowchart of FIG.
[0059]
Also in this embodiment, in steps S71 to S76, the engine rotational speeds are "0 rpm", "1 to 500 rpm", "501 to 1000 rpm", "1001 to 1500 rpm", "1501 to 2000 rpm", and "2001 to 2500 rpm", respectively. Is determined.
[0060]
When it is determined in step S71 that the engine speed obtained from the engine speed sensor 2 is substantially 0 rpm, the timer T9 is executed in the same manner as in steps S6 to S10 in FIG. 2 and steps S37 to S40 in FIG. Is used to increment the engine speed data DATA [12] by “1” and store it in the memory 74.
[0061]
Next, when it is determined in step S72 that the engine speed is 1 to 500 rpm, the engine speed data DATA [13] is incremented by "1" by using the timer T10 in steps S81 to S84 and stored in the memory 74. Store.
[0062]
When it is determined in step S73 that the engine speed is 501 to 1000 rpm, the engine speed data DATA [14] is incremented by "1" and stored in the memory 74 by using the timer T11 in steps S85 to S88. I do.
[0063]
When it is determined in step S74 that the engine speed is 1001 to 1500 rpm, the engine speed data DATA [15] is incremented by "1" by using the timer T12 in steps S89 to S92 and stored in the memory 74.
[0064]
When it is determined in step S75 that the engine speed is 1501 to 2000 rpm, the engine speed data DATA [16] is incremented by "1" by using the timer T13 in steps S93 to S96 and stored in the memory 74.
[0065]
When it is determined in step S76 that the engine speed is 2001 to 2500 rpm, the engine speed data DATA [17] is incremented by "1" by using the timer T14 in steps S97 to S100 and stored in the memory 74. When it is determined that the engine speed exceeds 2500 rpm, the engine speed data DATA [18] is incremented by "1" by using the timer T15 in steps S101 to S104, and the process proceeds to step S3 shown in FIG. I will return.
[0066]
Therefore, in this case as well, if the power is turned off, the data DATA [12] to [18] are written to the EEPROM 76 (step S24).
[0067]
In this way, by classifying the engine speed into several ranges and measuring the respective integrated times, it is possible to obtain data in which factors of fuel consumption deterioration are narrowed down.
[0068]
Although the display 77 is provided as described above, when this display is not provided, the system is provided with a communication function to output data and to be performed by another device having a display or a printer. Is also good.
[0069]
【The invention's effect】
According to the engine automatic stop and start system according to the present invention described above, the controller time was automatically stopped, preferably time measured by classifying the vehicle speed and / or engine speed to a predetermined range of several Since the measurement result is written to the EEPROM and output to an external device or a display, it is possible to judge whether the fuel efficiency data is appropriate, and to provide the driver or the operation manager with guidance data on low fuel consumption driving. .
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of an automatic engine stop / start device according to the present invention.
FIG. 2 is a flowchart showing a control program (measurement of automatic stop time) stored and executed by a CPU used in the engine automatic stop / start device according to the present invention.
FIG. 3 is a flowchart showing a control program (measurement of vehicle speed) stored and executed in a CPU used in the engine automatic stop / start device according to the present invention.
FIG. 4 is a flowchart showing a control program (measurement of engine speed) stored and executed by a CPU used in the engine automatic stop / start device according to the present invention.
FIG. 5 is a block diagram showing a conventionally known exhaust brake operation circuit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle speed sensor 2 Engine speed sensor 3 Clutch switch 4 Neutral switch 5 Cooling water temperature sensor 6 Air pressure sensor 7 Controller 10 Air tank 11 Solenoid valve (M / V)
12 Air Cylinder 13 Intake Shutter 14 Starter Motor 20 Data Erase Switch 76 EEPROM
77 Indicator 78 Select switch ENG In the engine drawings, the same reference numerals indicate the same or corresponding parts.

Claims (5)

An engine automatic stop / start device that automatically stops the engine when a predetermined stop condition is satisfied and automatically starts the engine when another predetermined start condition is satisfied.
The controller is to measure total time of performing the automatic stop, the measured value is determined belongs to one segment of which is divided by a time width, writes the number of the segment apart from the automatic stop in the EEPROM An automatic engine stop / start system that outputs the output to an output device. The engine automatic stop / start device according to claim 1,
A vehicle speed detecting means, and characterized in that a vehicle speed to which the controller is further detected by vehicle speed detection means, and time measurement for each segment is divided by the vehicle speed width, and outputs the measured value to the output equipment Engine automatic stop / start device. The engine automatic stop / start device according to claim 1 or 2,
An engine speed detecting means, wherein the controller further measures the time of the engine speed detected by the engine speed detecting means for each section divided by the engine speed width, and outputs the measured value to the output device. Automatic engine stop / start device characterized by output to a vessel. The engine automatic stop / start device according to claim 2 or 3,
The controller, an engine automatic stop and start system that is characterized by having a selection switch for output switching of the output devices. The engine automatic stop / start device according to any one of claims 1 to 4,
An automatic engine stop / start device characterized in that the measurement result is stored in the EEPROM when the power supply of the controller is turned off from ON and the stored data is deleted from the EEPROM by a data deletion switch.

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