JP2000314333A - Vehicular control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the device which can cope the improvement of a fuel consumption by the engine stop and the request of air conditioner of an occupant as much as possible, while restraining the reduction of the effect of the exhaust gas reduction, in the vehicle with the air conditioner having a vehicular engine automatic stop restart device. SOLUTION: When an outside temperature is not an intense heat temperature and intense cold temperature ('No' in step 40) and a vehicle room inside temperature remains in an enlarged suitable temperature area (Yes at step 60), the existence/absence of sunshine is decided (step 80), at the sunshine time, at no sunshine time, respectively, by the combination of the grouping result of cold outer air temperature/suitable temperature/hot temperature (step 50) with the grouping result of slightly cold car room inside temperature/suitable temperature/slightly hot temperature (step 70), whether the engine automatic stop treatment is carried out is decided (step 90, step 100).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic engine stop automatic engine for automatically stopping an engine when a predetermined stop condition is satisfied and automatically restarting the engine automatically when a predetermined restart condition is satisfied. The present invention relates to a control device for a vehicle with a cooling / heating device having a restart device. In the present specification, an air conditioner is a cooling device that compresses refrigerant by a compressor and an engine cooling water, or a heating device that uses heat obtained by driving an engine, or one or both of them. Means an air conditioner provided.

[0002]

2. Description of the Related Art A vehicle equipped with an automatic engine stop automatic restart device for a vehicle that automatically stops an engine under predetermined engine stop conditions and automatically restarts the engine with battery power under predetermined engine restart conditions is known. It is known. On the other hand, the proportion of vehicles equipped with an air conditioner has become extremely high due to a demand for always obtaining an appropriate temperature in the passenger compartment. Therefore, the above-described vehicle engine automatic stop automatic restart device is also often mounted on a vehicle equipped with an air conditioner.

[0003]

The automatic engine stop automatic restart system aims to improve fuel efficiency and reduce exhaust gas by stopping the engine, and to increase the rate of stopping the engine as much as possible. It is desirable that the conditions for prohibiting or canceling the automatic stop of the engine be reduced as much as possible.

On the other hand, when considering an air conditioner, there is a demand to operate the air conditioner as much as possible in order to always keep the temperature in the vehicle interior appropriately. For example, it is known that the engine is not automatically stopped when the vehicle interior temperature does not reach the temperature set by the occupant for cooling (Prius New Car Manual, October 1997, 6th edition). -53).

However, when such control is performed, when the temperature is outside the set temperature, the automatic stop of the engine is canceled because the air conditioner is always driven, and the ratio of not performing the automatic stop of the engine is increased. And the effect of reducing exhaust gas is reduced.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a vehicle equipped with an air conditioner having an automatic engine stop / restart system for a vehicle, which suppresses a reduction in the effects of improving fuel efficiency and reducing exhaust gas by stopping the engine and reducing the occupant's occupancy as much as possible. The goal is to provide a device that can respond to air conditioning requirements.

[0007]

According to the first aspect of the present invention, an automatic engine stop that automatically stops the engine under predetermined engine stop conditions and automatically restarts the engine under predetermined engine restart conditions is provided. A control device for a vehicle with an air conditioner having an automatic restart device, comprising a vehicle interior temperature detecting means, and adding a slightly suitable sub-optimal temperature region slightly above and below a suitable temperature region suitable for an occupant having a wide vehicle interior temperature. A control device is provided for determining whether or not the vehicle is in an extended suitable temperature region and prohibiting automatic stop of the engine when the vehicle interior temperature is in a region other than the extended suitable temperature region. According to the control device configured as described above, when the vehicle interior temperature is in an area other than the expanded suitable temperature area obtained by adding a slightly more suitable sub-optimum temperature area to the upper and lower suitable temperature areas suitable for the occupant having the width, the engine is not driven. Automatic stop is prohibited.

According to the invention described in claim 2, according to claim 1
In the invention according to the invention, further comprising an outside air temperature detecting means, when the outside air temperature is a very cold temperature equal to or lower than a predetermined first temperature or a very hot temperature equal to or higher than a predetermined second temperature, A control device is provided that prohibits automatic stop of the engine regardless of the room temperature. According to the control device configured as described above, when the outside air temperature is a very cold temperature or a very hot temperature, the automatic stop of the engine is prohibited regardless of the vehicle interior temperature, and the cooling based on the automatic stop of the engine, Alternatively, a sudden change in vehicle interior temperature due to the suspension of heating is prevented.

According to the invention described in claim 3, according to claim 2
In the invention of the above, further provided is a solar radiation detecting means for detecting the presence or absence of solar radiation, when the outside air temperature is between the first temperature and the second temperature, and the vehicle interior temperature is within the expansion suitable temperature region, Based on the outside air temperature, vehicle interior temperature, and presence or absence of solar radiation,
A control device is provided for determining whether to prohibit automatic stop of an engine. According to the control device configured as described above, when the outside air temperature is not a very cold temperature or a very hot temperature, and the vehicle interior temperature is within the expansion suitable temperature range, the outside air temperature, the vehicle interior temperature, and the solar radiation Based on presence or absence
It is determined whether to prohibit the automatic stop of the engine.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 shows a drive system common to each embodiment of the present invention. In FIG.
1 is an engine mounted on a vehicle, and 2 is an automatic transmission. The engine 1 has a motor / generator 3 functioning as a motor and a generator for restarting the engine 1 and an electromagnetic clutch 26,
The pulley 22, the belt 8, the pulley 23, and the reduction mechanism R are connected to each other.

The reduction mechanism R is of a planetary gear type and has a sun gear 3
3, including a carrier 34, a ring gear 35, and a brake 3
1. It is incorporated between the motor / generator 3 and the pulley 23 via a one-way clutch 32. Note that the one-way clutch 32 can be replaced with a clutch.

The oil pump 19 for the automatic transmission 2 is driven by, for example, a torque converter (not shown) directly connected to the crankshaft 1a of the engine 1 as in the past. Reference numeral 11 in the figure denotes a pump for power steering, 16 denotes a compressor for an air conditioner, and the crankshaft 1a of the engine and the motor generator 3 are connected to the pulleys 9, 14.
And a belt 8.

Although not shown in FIG. 2, in addition to the above-mentioned auxiliary equipment, an engine oil pump, an engine water pump, and the like are also connected. Reference numeral 4a denotes an inverter electrically connected to the motor generator 3.
The inverter 4a varies the supply of electric energy from the battery 5a, which is a power source, to the motor generator 3 by switching, thereby varying the rotation speed of the motor generator 3. Further, switching is performed such that electric energy is charged from the motor generator 3 to the battery 5a.

The battery 5a is a battery dedicated to driving the motor generator 3, and has a rated voltage of 48V or 36V. On the other hand, the battery 5b has a rated voltage of 12V for normal auxiliary equipment, and the battery 5b has a DC
It is connected to the battery 5a via the / DC converter 4b.

Reference numeral 7 denotes control of intermittent operation of the electromagnetic clutch 26,
And a controller for performing switching control and the like of the inverter 4a. As input signals to this controller, an on / off signal from the air conditioner switch 42, an on / off signal of the automatic stop running mode (eco-run) switch 40, an engine speed signal from a NE (engine speed) sensor 49, a shift lever A detection signal from a shift position sensor 45 for detecting a shift position of the engine, and an engine cooling water temperature sensor 4 for detecting a water temperature.
7, a vehicle speed signal from a vehicle speed sensor 50, a foot brake signal from a foot brake sensor 51, a hand brake signal from a hand brake sensor 52, an accelerator opening sensor 54, and a vehicle disposed at an appropriate place in the vehicle compartment. A vehicle interior temperature sensor 55 for detecting the indoor temperature, for example, an outside air temperature sensor 5 disposed on the back side of the bumper and detecting the outside air temperature
6. For example, a signal from the solar radiation sensor 57 disposed on the dashboard and detecting the presence or absence of solar radiation is input.

An indicator 46 for notifying the driver of the automatic stop and automatic restart of the engine, that is, when the eco-run is being performed, and an indicator 48 for notifying the driver of the fact that the eco-run is not being performed. Is provided.

When the engine 1 is automatically stopped, the controller 7 outputs a control signal for disconnection to the electromagnetic clutch 26, and the power is not transmitted between the pulley 22 and the engine 1. On the other hand, when the accessory is operated while the engine 1 is stopped, the controller 7 sends a corresponding switching signal to the inverter 4 so that the motor / generator 3 rotates with a torque considering the load of the accessory and the like. Output.
At this time, the brake 31 is turned on (ring gear fixed).
And the electromagnetic clutch 26 is turned off. With such a state, the motor generator 3 and the pulley 23 are in a state where the rotation is reduced and the power is transmitted as viewed from the motor generator 3, and the motor generator 3 and the pulley 23 are required to drive the accessories 11, 16 and the like. Power can be easily secured.

In order to use the motor / generator 3 as a generator or to drive the accessories 11 and 16 while the engine is running, the brake 31 is turned off and the electromagnetic clutch 26 is turned off. Are turned on. By doing so, the power is transmitted from the engine side, and the power is absorbed by the motor generator 3, whereby the motor generator 3 and the pulley 23 are directly connected by the one-way clutch 32, and the rotation speed of the engine increases. Also motor generator 3 and accessories 1,1
6 can be prevented from operating at high speed. It should be noted that even if the one-way clutch 32 is replaced with a clutch, substantially the same operation as described above can be obtained.

Next, when the engine 1 is restarted in the eco-run mode, the controller 7 outputs a signal for turning on the clutch 26 and turns on the brake 31 of the speed reducer R.
A signal is output to make the ring gear 35 unrotatable. When the motor / generator 3 is rotated in this state, the rotation of the sun gear 33 is transmitted to the pinion gear 36, and the ring gear 35 is locked, so that the pinion gear 36 revolves around the sun gear 33 while rotating. Accordingly, the carrier 34 holding the pinion gear 36 revolves around the sun gear 33, and the pulley 23 coaxial with the carrier 34 also rotates. At this time, the rotation speed of the pulley 23 is
The motor has a reduction ratio determined by the number of teeth of the ring gear 35.
The rotation speed of the shaft of the generator 3 is reduced. Therefore, torque sufficient for starting the engine 1 is transmitted from the motor generator 3, and the engine is restarted. This leads to the effect that the size of the motor generator 3 can be reduced. In addition, since the pulley 23 rotates, the auxiliary machine is driven at the same time. An electromagnetic clutch (not shown) is provided between the compressor 16 for the air conditioner and the pulley 14, and is turned on when the compressor 16 is operated.
And the others are turned off to reduce the driving torque.

The automatic restart after the automatic stop of the engine 1 is as follows.
It is realized on the controller 7 according to the control program stored in the ROM. The controller 7 is, for example,
The vehicle speed is zero, the brake pedal is depressed, the accelerator pedal is not depressed, the engine water temperature and A / T operating oil temperature are within a predetermined range, and the SOC (charge state) of the battery is within a predetermined range. It is determined that the engine should be automatically stopped on condition that the shift lever is in the D or N position, or simply that the shift lever is in the P position. When it is determined that the engine should be stopped automatically, a command to cut off the fuel supply to the engine 1 is issued. On the other hand, for example, it is determined that the engine should be restarted automatically when the accelerator pedal is depressed or the brake is turned off.
Then, when it is determined that the engine should be automatically restarted, a command to restart fuel supply to the engine 1 and restart the engine is issued.

Next, the hill hold control will be described. If the engine 1 is operating even when the vehicle is stopped, the forward clutch and the like are engaged and the creep force for moving the vehicle forward as long as the shift lever is in the traveling position such as D by the action of the torque converter. Works. Therefore, the vehicle can be prevented from moving backward by this creep force on a slope having a gentle slope. However, in the automatic stop automatic restart device, when the brake is depressed and the vehicle stops, the engine 1 stops, so that the creep force does not work. Therefore, if the stopped position is on an uphill road, the vehicle will retreat at the moment when the brake is released.

Therefore, when it is determined that the engine automatic stop condition is satisfied and the system shifts to the engine stop mode, the hill hold control for suppressing the rotation of the wheels by holding the master cylinder hydraulic pressure of the brake device and holding the braking force is performed. Do it. This hill hold control is also realized on the controller 7 by a program. The hill hold control is preferably performed by driving an actuator (not shown) for an antilock brake device (ABS). Further, the rotating shaft connected to the wheels may be mechanically locked. The hill hold control continues the braking force when the transmission is in the traveling position and the engine 1 is restarted under specific conditions not intended for traveling while the engine 1 is automatically stopped.

Next, control of the present embodiment configured as described above will be described. This embodiment operates as claimed in claim 3. That is, when the outside air temperature TO is not very cold or very hot and the vehicle interior temperature is within the suitable temperature range for expansion, the automatic stop of the engine is performed based on the outdoor air temperature TO, the vehicle interior temperature TI, and the presence or absence of solar radiation. Decide whether to prohibit.

In FIG. 1, in step 20, input signals from various sensors are processed. In step 30, it is determined whether or not the precondition of the automatic engine stop is satisfied. Specifically, that each sensor is operating normally,
The engine water temperature is equal to or higher than a predetermined value, the AT oil temperature is equal to or higher than a predetermined value, the SOC (charge state) of the battery 5a is sufficient, and each sensor indicates a normal value. If a negative determination is made in step 30, the process jumps to step 120 without doing anything, and returns. If an affirmative determination is made in step 30, the process proceeds to step 40.

In step 40, it is determined whether or not the outside air temperature TO is extremely hot or extremely cold. If the determination is affirmative, that is, if the outside air temperature TO is very hot or extremely cold, the routine proceeds to step 120. Jump return. For example, if the outside air temperature TO is 0 ° C. or less, it is determined that the temperature is extremely cold.

If a negative determination is made in step 40, that is, if the outside air temperature TO is not extremely hot or not extremely cold, the process proceeds to step 50, where the outside air temperature TO is set to "cold", "suitable temperature", or "hot". The process proceeds to step 60 after classifying whether it is one of them. For example, they are classified as follows. 0 ° C <Outside air temperature TO ≤ 13 ° C: Cold 13 ° C <Outside air temperature TO ≤ 28 ° C: Suitable temperature 28 ° C <Outside air temperature TO ≤ 35 ° C: Hot

In step 60, it is determined whether or not the vehicle interior temperature TI is an extended suitable temperature region obtained by adding a suitable temperature region having a width suitable for the occupant, a slightly hotter region, and a slightly colder region. Is performed, and if a negative determination is made, that is, if the vehicle interior temperature TI is not in the suitable temperature range for expansion, the process jumps to step 120 and returns. For example, if the vehicle interior temperature TI is equal to or lower than 5 ° C. or equal to or higher than 30 ° C., it is determined that the vehicle is not in the expansion suitable temperature range, and the routine jumps to step 120.

If an affirmative determination is made in step 60, that is, if the vehicle interior temperature TI is within the expanded suitable temperature range, the routine proceeds to step 70, where the vehicle interior temperature TI is set to "slightly cold", "suitable temperature", "slightly suitable". The process proceeds to step 80 after classifying whether it is hot. For example, they are classified as follows. If 5 ° C <indoor temperature TI ≦ 15 ° C: slightly cold 15 ° C <indoor temperature TI ≦ 25 ° C: suitable temperature If 25 ° C <indoor temperature TI ≦ 30 ° C: slightly hot

In step 80, it is determined whether or not there is solar radiation. If the determination is affirmative, that is, if there is solar radiation, the process proceeds to step 90. If the determination is negative, that is, if there is no solar radiation, the process proceeds to step 90. Go to 100.

If there is solar radiation and the routine proceeds to step 90, the routine proceeds to step 90 where the classification of the outside air temperature TO in step 50 and
Based on the classification of the vehicle interior temperature TI in step 70, the following judgment is made. When the outside air temperature TO is “cold” and the vehicle interior temperature TI is “slightly cold”, “appropriate temperature”, or “slightly hot”, for example, 0 ° C <TO ≦ 13 ° C and 5 ° C
When <TI ≦ 30 ° C., the outside air temperature TO is “suitable temperature”, and when the vehicle interior temperature TI is “slightly cold”, “suitable temperature”, or “slightly hot”, for example, 13 ° C. <TO ≦ 28 ° C. , 5
If ℃ <TI ≦ 30 ° C., the outside air temperature TO is “hot”
When the vehicle interior temperature TI is “slightly cold” or “suitable temperature”, for example, 28 ° C. <TO ≦ 35 ° C. and 5 ° C. <TI ≦ 2
In the case of 5 ° C., the possibility of the vehicle interior temperature TI shifting to an inappropriate direction due to the stop of the air conditioner is low. On the other hand, if the outside air temperature TO and the vehicle interior temperature TI have a combination other than the above, it is highly possible that the vehicle interior temperature TI shifts to an inappropriate direction due to the stoppage of the air conditioner, and therefore, the engine should not be automatically stopped. Therefore, a negative determination is made.

The above judgment is called judgment 1, and FIG. 3 is a diagram for explaining this judgment 1. If an affirmative determination is made in step 100, the process proceeds to step 110, where an automatic engine stop process is performed in step 110, and the process proceeds to step 120 and returns. If a negative determination is made in step 100, the process jumps to step 120 and returns.

If there is no solar radiation and the process proceeds to step 100, the following determination is made in step 100 based on the classification of the outside air temperature TO in step 50 and the classification of the vehicle interior temperature TI in step 70. The outside air temperature TO is "cold"
When the vehicle interior temperature TI is “appropriate temperature” or “slightly hot”, for example, 0 ° C <TO ≦ 13 ° C and 15 ° C <TI ≦
In the case of 30 ° C., when the outside air temperature TO is “appropriate temperature” and the vehicle interior temperature TI is “slightly cold”, “suitable temperature” or “slightly hot”, for example, 13 ° C. <TO ≦ 28 ° C. and 5 ° C. < TI ≦
In the case of 30 ° C., when the outside air temperature TO is “hot” and the vehicle interior temperature TI is “slightly cold”, “suitable temperature” or “slightly hot”, for example, 28 ° C. <TO ≦ 35 ° C. and 5 ° C. < TI ≦
In the case of 30 ° C., the possibility of the vehicle interior temperature TI shifting to an inappropriate direction when the air conditioner is stopped is low, so that it is determined that the engine automatic stop is possible and an affirmative determination is made. On the other hand, if the outside air temperature TO and the vehicle interior temperature TI have a combination other than the above, it is highly possible that the vehicle interior temperature TI shifts to an inappropriate direction due to the stoppage of the air conditioner, and therefore, the engine should not be automatically stopped. Therefore, a negative determination is made.

The above judgment is called judgment 2, and FIG. 4 is a diagram for explaining this judgment 2. If an affirmative determination is made in step 100, the process proceeds to step 110, where an automatic engine stop process is performed in step 110, and the process proceeds to step 120 and returns. If a negative determination is made in step 100, the process jumps to step 120 and returns.

Since the present embodiment operates as described above, first, when the outside air temperature TO is extremely cold or extremely hot, the automatic stop of the engine is prohibited, and the vehicle interior temperature TI is reduced by the automatic stop of the engine. Sudden change is prevented. If the outside air temperature TO is not extremely cold or very hot, and the vehicle interior temperature TI is not in the expanded suitable temperature range, which is the optimum temperature range suitable for the occupant plus a slightly hotter region and a slightly colder region, the engine Is automatically prohibited, and the automatic stop of the engine prevents the vehicle interior temperature TI from changing in an inappropriate direction. When the outside air temperature TO is not very cold or very hot and the vehicle interior temperature TI is in the expansion suitable temperature range, the outside air temperature TO
It is determined whether or not to prohibit the automatic stop of the engine based on the vehicle interior temperature TI and the presence or absence of solar radiation. For example, when there is solar radiation, the automatic stop of the engine is not prohibited not only when the vehicle interior temperature TI is appropriate but also when it is slightly cold, and when there is no solar radiation, the vehicle interior temperature TI is The automatic stop of the engine is not prohibited not only in the case but also in a slightly hot situation, and the area for the automatic stop of the engine is large, so that the reduction effect of the fuel consumption and the exhaust gas is prevented from being reduced.

[0035]

According to the invention described in each claim, the engine is automatically stopped under predetermined engine stop conditions,
In a vehicle equipped with an air conditioner having an automatic engine stop automatic restart device that automatically restarts the engine with battery power under predetermined engine restart conditions, the vehicle interior temperature is set to a suitable temperature range set with a width. The engine is automatically stopped unconditionally if it is in the appropriate temperature range, but if it is in the appropriate temperature range, the engine is automatically stopped. The engine is not automatically stopped unconditionally, but the chances of prohibiting the automatic stop of the engine are reduced. As a result, deterioration of fuel consumption and exhaust gas is suppressed.

[Brief description of the drawings]

FIG. 1 is a flowchart of control according to an embodiment of the present invention.

FIG. 2 is a system configuration diagram according to the embodiment;

FIG. 3 is a diagram showing an engine automatic stop range when there is solar radiation;

FIG. 4 is a view showing an engine automatic stop range when there is no solar radiation;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Automatic transmission 3 ... Motor generator 4 ... Inverter 5 ... Battery 7 ... Controller 16 ... Air conditioner compressor 40 ... Ecolan switch 42 ... Air conditioner switch 44 ... Shift lever 45 ... Shift position sensor 46 ... Engine automatic stop Indicator 47 ... Engine cooling water temperature sensor 48 ... Engine automatic stop non-execution indicator 49 ... Engine rotation speed sensor 50 ... Vehicle speed sensor 51 ... Foot brake sensor 52 ... Hand brake sensor 54 ... Accelerator opening sensor 55 ... Vehicle interior temperature sensor 56 ... Outside air Temperature sensor 57: Solar radiation sensor R: Reduction mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takanori Moriya 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Ryo Sanmoto 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation F-term (reference) 3G092 AC03 BB10 CA02 EA09 EA14 FA15 FA24 HE01Z HE08Z HF00Z HF02Z HF04X HF08Z HF12Z HF21Z HF26Z HG00Z 3G093 AA05 AA12 BA21 BA22 CA02 DA01 DA05 DA06 DB11 DB05 DB05 DB11 DB11

Claims (3)

[Claims] 1. A control device for a vehicle with an air conditioner having an automatic engine stop automatic restart device for automatically stopping an engine under predetermined engine stop conditions and automatically restarting the engine under predetermined engine restart conditions. Determining whether or not the vehicle interior temperature is in an extended suitable temperature region by adding a slightly more suitable sub-optimal temperature region up and down to a suitable temperature region suitable for an occupant having a width; A control device for prohibiting an automatic stop of an engine when a temperature is in a region other than the expansion suitable temperature region. 2. The method according to claim 1, further comprising an outside air temperature detecting means, wherein when the outside air temperature is a severely cold temperature equal to or lower than a predetermined first temperature or a severe heat temperature equal to or higher than a predetermined second temperature, The control device according to claim 1, wherein the automatic stop of the engine is prohibited regardless of the vehicle interior temperature. 3. A solar radiation detecting means for detecting presence or absence of solar radiation, wherein an outside air temperature is between a first temperature and a second temperature, and
3. The system according to claim 2, wherein when the vehicle interior temperature is within the expansion suitable temperature range, whether to prohibit the automatic stop of the engine is determined based on the outside air temperature, the vehicle interior temperature, and the presence or absence of solar radiation. The control device according to claim 1.