JP5132454B2 - Control device for idle stop car - Google Patents

Description

  The present invention relates to a control device for an idle stop vehicle that stops an engine by an idle stop (also referred to as an idling stop) based on a travel stop, and more particularly, to an improvement in operability of turning on and off an idle stop.

  Conventionally, an idle stop vehicle functions by automatically turning on the idle stop when the ignition key is turned to start the engine. And when the idle stop is on, every time the brake pedal is depressed and the travel stops, the engine automatically stops by the idle stop, and then when the foot is removed from the brake pedal to start the travel, the engine Will automatically restart and be ready to run. By repeating such automatic engine stop and restart, the idle stop vehicle achieves improved fuel efficiency and environmental protection (such as exhaust gas reduction).

  By the way, when waiting for a right turn signal, for example, in order to avoid a delay in starting due to an idle stop, it may be desired to prohibit (turn off) the idle stop and start quickly at the same time as the signal is switched. In addition to waiting for a right turn signal, it may be necessary to prohibit idle stop depending on traffic conditions.

Therefore, in this type of idle stop vehicle, a dedicated operation switch for stopping and restarting the idle stop is provided at a position where the driver can easily operate with hands or feet without changing the driving posture. It has been proposed to turn the stop on and off (see, for example, Patent Document 1).
JP 2000-34939 A (for example, paragraphs [0012]-[0016], FIG. 1)

  Provided with a dedicated switch for turning off and on the idle stop as in the prior art, and turning on and off the idle stop by operating these switches, the driver not only operates the steering wheel and pedal during driving, There is a problem that the idle stop must be turned on and off by reaching a dedicated switch, which makes the operation during operation complicated and makes the idle stop on and off complicated.

  An object of the present invention is to enable an idle stop to be easily turned on and off in an idle stop vehicle without reaching for a dedicated operation switch.

In order to achieve the above-described object, an idle stop vehicle control device according to the present invention is an idle stop vehicle control device that stops an engine by an idle stop based on a travel stop, wherein the travel speed is detected from a vehicle speed detected by a vehicle speed sensor. A travel stop detection means for detecting a stop, a pedal depression amount detection means for detecting a depression amount of a brake pedal that changes when the brake pedal is depressed, and the pedal when the travel stop detection means detects a travel stop When the depression amount detection means detects the depression amount of the brake pedal equal to or greater than a predetermined threshold, the idle stop is switched from on to off, and then the traveling stop detection means continuously detects the traveling stop , and in the brake pedal is depressed, the pedal depression amount detecting means said predetermined threshold value or more By detecting the amount of depression of the brake pedal, and a idling stop control unit turned back on the idle stop from the off,
After the idle stop is switched off, the vehicle is kept in the travel stop state even while the idle stop is turned back on (Claim 1).

  In the control device for the idle stop vehicle according to the first aspect of the present invention, when the driver stops driving by stepping on the brake pedal because of waiting for a signal or turning left and right, the engine is stopped by the idle stop, and the travel stop detecting means is driven. Detect a stop.

  At this time, when the driver further depresses the brake pedal with a certain level of strength, the pedal depression amount detection means detects the depression amount of the brake pedal exceeding a predetermined threshold, and the idle stop control means turns the idle stop from on to off. Switch and restart the engine.

  Therefore, for example, when the vehicle is stopped waiting for a right turn, the brake pedal is depressed to turn off the idle stop, and when the signal changes, the vehicle can start quickly without being affected by the idle stop.

  In addition, after the driver depresses the brake pedal to switch from idling stop on to off, when the driver depresses the brake pedal again with a certain level of strength or more, the pedal depressing amount detection means detects that the brake pedal amount exceeding the predetermined threshold The depression amount is detected, and the idle stop control means switches the idle stop from off to on and stops the engine.

  Each time the driver depresses the brake pedal with a certain level of strength or more while driving is stopped, the pedal depression amount detection means detects the depression amount of the brake pedal above a predetermined threshold, and the idle stop control means turns on the idle stop. Can be switched alternately from to off and vice versa.

  Therefore, it is possible to easily turn on / off the idle stop by a driving operation in which the brake pedal on which the foot is placed is stepped on as it is without having to reach out to dedicated operation switches and operate the switches during driving. Moreover, the engine can be started without removing the foot from the brake pedal (while the brake is applied).

  Next, in order to describe the present invention in more detail, an embodiment will be described in detail with reference to FIGS.

(One embodiment)
An embodiment will be described with reference to FIGS. 1 is a block diagram of a part of the idle stop vehicle 1, FIG. 2 is a timing chart of the idle stop, FIG. 3 is a timing chart when the idle stop is turned off, and FIG. 4 is a timing chart when the idle stop is turned on again. It is.

  An idle stop vehicle 1 shown in FIG. 1 is a known reciprocating engine AT (automatic) passenger vehicle that is driven by an engine 2. When an ignition key (not shown) is turned to start a starter 3, an electronic fuel injection control ECU (hereinafter referred to as an electronic fuel injection control ECU) The fuel (gasoline) is supplied to the engine 2 through 4 (referred to as EFIECU), and the engine 2 is started.

  The idle stop vehicle 1 also includes a hydraulic brake mechanism 5. Then, when a booster-structured master cylinder 7 is connected to the brake pedal 6 and the driver steps on the brake pedal 6, a brake fluid pressure is generated according to the amount of depression, and the brake fluid of the fluid pressure passes through the fluid pressure path 8. For example, it is sent to the wheel cylinders 9a of the front and rear left and right wheels 9. Then, braking according to the brake fluid pressure is applied to the wheels 9, and the traveling of the idle stop vehicle 1 is stopped.

  The brake fluid pressure is detected by, for example, a brake master pressure sensor 10 attached to the master cylinder 7. And in this embodiment which detects the depression amount of a brake pedal from brake fluid pressure, the brake master pressure sensor 10 forms the brake fluid pressure detection means as the pedal depression amount detection means of the present invention.

  Further, the vehicle speed of the idle stop vehicle 1 is detected by the vehicle speed sensor 11, and the inclination of the travel path is detected by the inclination sensor 12.

  And the detection result (output) of every moment of sensors 10-12 is taken into idle stop ECU13 of microcomputer composition. The idle stop ECU 13 executes the set idle stop control to form the travel stop detecting means and the idle stop control means of the present invention.

  Next, the idle stop control of the idle stop ECU 13 will be described.

  First, when the engine is started by turning the ignition key, the idle stop ECU 13 is automatically initialized to the idle stop on state. “On” in the initial setting here means that the idle stop function is enabled.

  When the brake pedal 6 is depressed and the vehicle stops traveling while traveling with the idle stop turned on, the vehicle stop sensor means of the idle stop ECU 13 detects that the vehicle speed sensor 11 detects the vehicle speed 0 each time. (Based on this confirmation, the idle stop control means of the idle stop ECU 13 instructs the EFI ECU 4 to cut the fuel on the condition that the traveling is stopped. 2 is stopped and controlled to idle stop.

  When the brake pedal 6 is depressed and the engine 2 is stopped, the vehicle speed detected by the vehicle speed sensor 11 decreases as shown in FIG. 2A due to depression of the brake pedal 6, and at this time, the brake master pressure sensor 10 The detected brake fluid pressure changes, for example, as shown in FIG. When the detected vehicle speed becomes zero at t1 and the vehicle stops traveling, the engine 2 is turned off at t2, which is a little later than that, as shown in FIG. 2 (c), based on the fuel cut command from the idle stop control means. Stop.

  Next, when the driver removes his / her foot from the brake pedal 6 during the idle stop, the idle stop control means of the idle stop ECU 13 releases the fuel cut command to the EFI ECU 4 using that as a trigger. The starter 3 is started and the engine 2 is automatically restarted.

  Thereafter, while the idling stop is set to on, the idling stop control means of the idling stop ECU 13 stops the engine 2 every time the brake pedal 6 is depressed and stops running to control the idling stop. Every time the pedal 6 is no longer depressed, the idle stop is released and the engine 2 is restarted.

  Next, in the case of waiting for a right turn signal, for example, when the vehicle starts quickly at the same time as the signal is switched, the brake pedal 6 is depressed to stop running, and the engine 2 is stopped by idle stop, and the brake pedal 6 is Furthermore, it is depressed for a short time with a strong force.

  At this time, the detected hydraulic pressure (brake hydraulic pressure) of the brake master pressure sensor 10 becomes equal to or higher than the set threshold value, and the idle stop control means of the idle stop ECU 13 is detected by detecting the depression amount of the brake pedal equal to or higher than the predetermined threshold value. Switches the idle stop from on to off, cancels the fuel cut command to the EFIECU 4, starts the starter 3, and automatically restarts the engine 2.

  Therefore, when the signal is switched, it is possible to start immediately by removing the foot from the brake pedal 6.

  In this case, the vehicle speed detected by the vehicle speed sensor 11, the brake fluid pressure detected by the brake master pressure sensor 10, and the on / off of the engine 2 are as shown in FIGS. 3A, 3B, 3C, for example. When the engine 2 is stopped at t2 due to the idle stop, the brake pedal 6 is further stepped on with a strong force, so that the idle stop is released and the engine is restarted and turned on at t3.

By the way, for example, when waiting for a right turn signal is long and the engine is restarted after releasing the idling stop, if it is desired to return to the idling stop state again, the brake pedal 6 is operated as shown in FIG. Step on again with a strong force. At this time, for example, at the time t4 following the time t3 , as shown in FIG. 4B, the detected hydraulic pressure of the brake master pressure sensor 10 becomes equal to or higher than the set threshold value, and the amount of depression of the brake pedal equal to or higher than the predetermined threshold value is detected. As a result, the idling stop control means of the idling stop ECU 13 returns from the idling stop to the on state, instructs the EFIECU 4 to cut the fuel, stops the engine 2 again and turns off as shown in FIG. Return to the state.

  Thereafter, every time the brake pedal 6 is depressed with a strong force, the idle stop is switched from off to on and vice versa.

  Therefore, the idling stop can be easily turned on and off by pressing the brake pedal 6 strongly without reaching out to operating the dedicated operation switches and operating the switches during operation, and the driver is not bothered. Therefore, for example, the idle stop can be easily canceled while the vehicle is waiting for a right turn, and the vehicle can start quickly at the same time as the signal is switched, thereby preventing the deterioration of the starting performance.

  By the way, the strength of depressing the brake pedal 6 for turning on and off the idle stop is a strength that does not occur with the normal depressing strength of the brake operation (about 1 to 3 MPa in brake fluid pressure) in order to prevent malfunction. The threshold is, for example, 5 MPa in terms of brake fluid pressure. In addition, if the time for depressing the brake pedal 6 is too short, there is a possibility of malfunction, and it is difficult to depress strongly for a long time. Therefore, it is an appropriate short time set based on experiments or the like. The idle stop ECU 13 detects an on / off operation (toggle operation) of the idle stop because the brake pedal 6 is equal to or greater than the threshold value for the short time or more.

  Further, since the brake fluid pressure increases on the slope, the inclination of the road is detected by the inclination sensor 12, and based on the result, the threshold value is increased on the slope by the idle stop ECU 13 to detect the on / off operation of the idle stop. It is preferable to do.

(Other embodiments)
Next, another embodiment will be described with reference to FIGS. 1 and 5.

  This embodiment is different from the above embodiment in that the idling stop ECU 13 in FIG. 1 detects two successive depressions of the brake pedal 6 as an idling stop on / off operation, thereby further preventing erroneous detection and malfunction. This is the point that I tried to do.

  5 is a timing chart similar to FIGS. 2 to 4, (a) is the vehicle speed detected by the vehicle speed sensor 11, (b) is the brake fluid pressure detected by the brake master pressure sensor 10, and (c) is the engine 2. Indicates on / off.

  Then, for example, after the idle stop is turned on by the travel stop waiting for a right turn and the engine 2 is stopped, when the brake pedal 6 is depressed twice at short intervals, the idle stop control means of the idle stop ECU 13 cuts the fuel to the EFI ECU 4. Is released, the idle stop is turned off, and the engine 2 is restarted as shown in FIG. Further, when the brake pedal 6 is stepped down twice at a shorter interval thereafter, the idle stop control means of the idle stop ECU 13 turns on the idle stop and stops the engine 2 as shown in FIG.

Every time the brake pedal 6 is depressed twice, the idle stop changes from on to off, and vice versa. The idle stop does not accidentally turn on and off when the brake pedal 6 is accidentally pressed strongly. There is also an advantage that the performance is further improved.

  In both the above-described embodiments, the driver can easily recognize from the engine sound whether the idle stop is turned on or off (whether the engine 2 is stopped or started) by operating the brake pedal 6 while the vehicle is stopped.

  The present invention is not limited to both the above-described embodiments, and various modifications other than those described above can be made without departing from the spirit thereof, for example, a brake pedal for turning on / off an idle stop. Needless to say, the strength of step 6 and the time of step 6 may be set appropriately so that no malfunction occurs. In both the embodiments, the brake fluid pressure detecting means for detecting the brake fluid pressure is used as the brake pedal depression amount detecting means. However, the operation amount of the brake pedal 6 is determined as the brake pedal depression amount detecting means of the present invention. You may use the brake operation amount detection means to detect. In this case, if the amount of operation of the brake pedal 6 is equal to or greater than a predetermined threshold, the idle stop may be switched on and off.

  Further, in the other embodiment, the idle stop may be turned on / off on condition that the brake pedal 6 is depressed three times, four times,...

  Furthermore, in both the above embodiments, when the idling stop is turned off by stepping on the brake pedal 6 while traveling is stopped, when the traveling is stopped by stepping on the brake pedal 6 after traveling, the previous idling stop is turned off. Alternatively, the idle stop may be turned on again.

  The present invention can be applied to various idle stop vehicle control devices equipped with the engine 2.

It is a block diagram of one embodiment of the present invention. It is a timing chart explaining the normal idle stop accompanying the travel stop of FIG. 2 is a timing chart when the idle stop of FIG. 1 is released and turned off. It is a timing chart when turning on the idle stop of FIG. 1 again. It is a timing chart when turning on and off the idle stop according to another embodiment of the present invention.

Explanation of symbols

1 Idle stop car 2 Engine 6 Brake pedal 10 Brake master pressure sensor 11 Vehicle speed sensor

Claims (1)

A control device for an idle stop vehicle that stops an engine by an idle stop based on a running stop,
A travel stop detection means for detecting the travel stop from a vehicle speed detected by a vehicle speed sensor;
Pedal depression amount detection means for detecting the depression amount of the brake pedal, which changes depending on the depression of the brake pedal,
When the travel stop detection means detects the travel stop, the pedal depression amount detection means switches the idle stop from on to off by detecting the depression amount of the brake pedal equal to or greater than a predetermined threshold, and thereafter The travel stop detection means continuously detects a travel stop , and the pedal depression amount detection means detects a depression amount of the brake pedal that is equal to or greater than the predetermined threshold in a state where the brake pedal is depressed. And idle stop control means for returning the idle stop from off to on ,
A control device for an idle stop vehicle , wherein after the idle stop is switched off, the vehicle is kept in a running stop state even while the idle stop is turned on .

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