JP3300307B2 - Hybrid vehicle control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a hybrid vehicle driven by an engine and a motor. The present invention relates to a hybrid vehicle control device that can be recovered.

[0002]

2. Description of the Related Art Hitherto, a hybrid vehicle provided with a motor in addition to an engine as a power source for running the vehicle has been known. Hybrid vehicles include series hybrid vehicles and parallel hybrid vehicles. A series hybrid vehicle is a vehicle in which a motor is driven using a power output of a generator driven by an engine and the like, and wheels are driven by the motor. Therefore, since the engine and the wheels are not mechanically connected, the engine can be driven at a substantially constant speed in the high-fuel-consumption, low-emission rotation speed range, and has better fuel efficiency and lower emission than the conventional engine vehicle. realizable.

On the other hand, in a parallel hybrid vehicle, a motor connected to the engine assists driving of the drive shaft of the engine, and a separately provided generator or the above-described motor is used as a generator to charge electric energy to a power storage device. Things. Therefore, although the engine and the wheels are mechanically connected, the load on the engine can be reduced, so that better fuel economy and lower emission can be realized as compared with a conventional engine vehicle.

[0004] In the above-mentioned parallel hybrid vehicle, a motor for directly driving the output of the engine is directly connected to the output shaft of the engine, and this motor functions as a generator at the time of deceleration or the like to store electricity in a battery or the like. And a motor that can generate a driving force by either or both of them and have a generator separately.

In such a hybrid vehicle,
For example, during acceleration, the motor is assisted by the motor, and during deceleration, the battery is charged by deceleration regeneration, and various other controls are performed to secure the battery's electric energy (hereinafter referred to as remaining capacity). To meet the needs of the elderly. For example, a large deceleration regeneration is obtained after high-speed running, so that the battery can recover a part of the consumption at the time of deceleration, and after traveling uphill on a mountain road or the like, deceleration when traveling downhill thereafter. The battery can be charged by regeneration (for example, disclosed in JP-A-7-123509).

[0006]

However, in the above-described conventional hybrid vehicle, the vehicle is driven in a situation where sufficient deceleration regeneration cannot be ensured, for example, the vehicle rapidly accelerates immediately after deceleration, or the vehicle runs uphill on a mountain road. After that, it may be necessary to continue traveling on flat ground. In the case of driving in the former case, the remaining capacity of the battery and the like will decrease without increasing as the vehicle continues to run because regenerative power cannot be recovered. Unless there is a problem, it is not possible to recover the excess battery remaining capacity used during uphill running.
Therefore, the present invention provides a control device for a hybrid vehicle that charges a power storage device when the remaining capacity of the power storage device is decreasing from an increase and the remaining capacity decreases by a predetermined amount from an initial read value.

[0007]

In order to solve the above-mentioned problems, the invention described in claim 1 provides an engine for outputting a propulsion force of a vehicle (for example, the engine E in the embodiment).
A motor (for example, the motor M in the embodiment) that generates an auxiliary driving force that assists the output of the engine, and supplies power to the motor or stores regenerative energy obtained by a regenerative operation of the motor when the vehicle is decelerated. A power storage device (e.g., the battery 3 in the embodiment), an assist determination unit (e.g., step S005 in the embodiment) that determines whether or not the motor can assist the output of the engine according to the driving state of the vehicle. Assist amount setting means (for example, final assist command value ASTPWRF in the embodiment) for setting the assist amount of the motor (for example, the final assist command value ASTPWRF) according to the operating state of the engine when the determination means determines that the output of the engine is assisted by the motor. , Steps S209, S211 in the embodiment,
S216) and a control device for a hybrid vehicle comprising: assist control means (for example, motor ECU 1 in the embodiment) for assisting the motor to output to the engine based on the assist amount set by the assist amount setting means. And a traveling start detecting means (for example, step S0 in the embodiment) for detecting the start of traveling of the vehicle.
50) and a remaining capacity detection unit (for example, a remaining capacity SOC in the embodiment) that calculates the remaining capacity of the power storage device (for example, the remaining capacity SOC in the embodiment).
The amount of discharge from the battery ECU 31 of the embodiment) and the amount of discharge from the initial remaining capacity of the power storage device when the start of traveling is detected (for example, the initial value SOCINT of the remaining battery capacity in step S057 of the embodiment) (for example, steps of the embodiment) Depth-of-discharge detecting means for detecting the depth of discharge DOD in S063 (for example, the battery ECU 3 of the embodiment)
1) and a lower threshold based on the initial remaining capacity (for example,
Lower threshold SOCL of step S060 in the embodiment
(MTL) and a lower threshold setting unit (for example, step S060 in the embodiment), and based on the initial remaining capacity.
Based on the upper threshold value (for example, step S in the embodiment)
Upper limit threshold value setting means (for example, step S06 in the embodiment) for setting the upper limit threshold value of SOCMTH 061
1), a mode setting means (for example, step S054 in the embodiment) for changing the control of the motor when the remaining capacity of the power storage device decreases to the lower limit threshold value, and the remaining capacity of the power storage device reaches the upper limit threshold value Mode setting canceling means (for example, step S062 in the embodiment) for canceling the setting of the motor control mode changed by the mode setting means when the motor setting is changed by the mode setting means. In accordance with the depth of discharge detected by the depth-of-discharge detecting means, the engine output assist determination threshold (for example, the throttle assist trigger threshold MAST, the intake pipe assist trigger threshold MTHAS in the embodiment) serving as a reference for the determination by the assist determining means.
T, a determination threshold value correcting means for correcting the intake pipe assist trigger threshold value MASTTH (for example, step S1 in the embodiment)
52, step S111 including step S162, and step S123 including step S172).

[0008] With such a configuration, for example, when the vehicle cannot be regenerated due to repetition of rapid acceleration and deceleration, or when the power storage device is reduced during traveling uphill such as traveling on a flat ground after traveling uphill. In a case where the capacity cannot be recovered by regeneration, when it is detected that the remaining capacity of the power storage device has decreased by a predetermined amount, the remaining capacity of the power storage device can be set in the recovery direction. Further, when the remaining capacity of the power storage device is set to the recovery direction, the decrease in the remaining capacity of the power storage device may be suppressed by raising the determination threshold by the determination threshold correction unit according to the depth of discharge and reducing the assist frequency. it can.

According to a second aspect of the present invention, the determination threshold value corrected by the determination threshold value correction means is corrected in accordance with a vehicle speed (for example, a control vehicle speed VP in the embodiment) (for example, a step in the embodiment). Step S154 in step S103, step S16 in step S111
4, step S174 in step S123). With this configuration, even in a case where sufficient regeneration cannot be ensured due to repeated starting and stopping at a low vehicle speed such as traffic congestion, etc., the determination threshold value is raised according to the vehicle speed and the depth of discharge to assist the vehicle. By reducing the frequency, the remaining capacity of the power storage device can be corrected in the recovery direction.

According to a third aspect of the present invention, there is provided an assist amount changing means (for example, step S219 in the embodiment) for correcting the assist amount of the engine by the motor instead of the determination threshold value correcting means, or a power storage during cruise travel. Cruise power generation amount changing means (for example, step S307 in the embodiment) for correcting the amount of charge to the device (for example, the cruise power generation CRSRGN in the embodiment).
A). With such a configuration, if the assist amount is set to be small by the assist amount changing unit, or if the cruise generation amount is set to be large by the cruise generation amount changing unit, the remaining capacity of the power storage device is promptly restored. Becomes possible. Claim 4
The described invention comprises an engine that outputs the propulsion of the vehicle,
A mode for generating an auxiliary driving force to assist the output of the engine.
And the motor to supply power to the motor or
Energy storage to store regenerative energy obtained by regenerative operation
Device and the motor according to the driving state of the vehicle.
Assist determination means for determining whether or not to assist the output of the engine
And an engine using a motor by the assist determination means.
The engine is operated when it is determined that
An assist for setting the assist amount of the motor according to the running state
And the assist amount setting means.
The engine by the motor based on the assist amount
Provided with assist control means for assisting output to the
A control device for an hybrid vehicle that starts driving of a vehicle.
Travel start detection means to detect and calculate remaining capacity of power storage device
Means for detecting the remaining capacity to be stored and storage when the start of traveling is detected.
Depth detection to detect the amount of discharge from the initial remaining capacity of electrical equipment
Discharge means and the discharge amount with respect to the initial remaining capacity are set (for example,
For example, in step S060 in the embodiment, the initial
Set the amount of charge relative to the remaining capacity (for example,
Step S061), the power storage device reduces to the discharge amount described above.
Mode setting method to change the control of the motor when it is short
And the mode when the power storage device reaches the charge amount.
The setting of the motor control mode changed by the setting means
A mode setting canceling means for canceling, and the mode setting means
When the motor control is changed, the depth of discharge is detected.
The assist according to the depth of discharge detected by the means.
Judgment by the judgment means for the engine output assist
A judgment threshold value correcting means for correcting the fixed threshold value.
Sign. The invention according to claim 5 is characterized in that the judgment threshold value is supplemented.
The judgment threshold value corrected by the correct means is corrected according to the vehicle speed.
It is characterized by being performed. The invention described in claim 6 is based on
Instead of the judgment threshold correction means, the motor
Assist amount changing means for correcting the drive assist amount, or
Correction of the amount of charge to the power storage device during loose running
A loose power generation amount changing means is provided.
In the invention according to claim 7, the correction of the determination threshold is performed by
Adding the value according to the electric depth to the reference judgment value
(For example, steps S152 and S16 in the embodiment
2, S172). The invention according to claim 8
Corrects the value corresponding to the depth of discharge with the vehicle speed (for example,
Steps S154, S164, S in the embodiment
174). The invention described in claim 9
Is the depth of discharge for throttle assist trigger correction
(For example, step S1 in the embodiment)
52, S155). Claim
The invention described in 10 has been carried out according to the above-mentioned depth of discharge.
The correction is further corrected according to the vehicle speed.
In steps S154 and S155).
You. The invention described in claim 11 is the intake pipe negative pressure assist.
In trigger correction, correction according to the depth of discharge is performed
(For example, steps S162 and S16 in the embodiment
5, S172, S175). Claim 1
The invention described in Item 2 is a supplementary measure performed in accordance with the above-mentioned depth of discharge.
Positive is further corrected according to vehicle speed (for example,
Steps S164, S165, S174, S17
5) It is characterized by the following. The invention described in claim 13 is:
The amount of charge to the power storage device during cruise travel is the depth of discharge
(For example, the step in the embodiment)
S307A, S319).

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment applied to a parallel hybrid vehicle, in which the driving force of both an engine E and a motor M is transmitted via a transmission T composed of an automatic transmission or a manual transmission to front wheels Wf and W as driving wheels.
f. When the driving force is transmitted from the front wheels Wf, Wf to the motor M during deceleration of the hybrid vehicle, the motor M functions as a generator to generate a so-called regenerative braking force, and converts the kinetic energy of the vehicle body into electric energy. to recover.

The driving and the regenerating operation of the motor M are performed by the motor E
This is performed by the power drive unit 2 in response to a control command from the CU 1. The power drive unit 2 has a high-voltage battery 3 that exchanges electric energy with the motor M.
The battery 3 is, for example, a battery in which a plurality of cells are connected in series and a plurality of modules are connected in series. The hybrid vehicle is equipped with a 12 volt auxiliary battery 4 for driving various accessories, and the auxiliary battery 4 is connected to the battery 3 via a downverter 5. FI
The downverter 5 controlled by the ECU 11 reduces the voltage of the battery 3 and charges the auxiliary battery 4.

The FIECU 11 operates the fuel supply amount control means 6 for controlling the fuel supply amount to the engine E in addition to the motor ECU 1 and the downverter 5, and operates the starter motor 7 as well as the ignition timing. Perform control. For this purpose, the FIECU 11 includes a signal from a vehicle speed sensor S1 for detecting a vehicle speed V based on the rotation speed of a transmission drive shaft, a signal from an engine speed sensor S2 for detecting an engine speed NE, and a transmission T A signal from a shift position sensor S3 for detecting a shift position, a signal from a brake switch S4 for detecting operation of a brake pedal 8, a signal from a clutch switch S5 for detecting operation of a clutch pedal 9, and a throttle opening TH And a signal from an intake pipe negative pressure sensor S7 for detecting the intake pipe negative pressure PB. In FIG. 1, 21 is C
Reference numeral 31 denotes a CVT ECU for VT control, and 31 denotes a battery ECU that protects the battery 3 and calculates the remaining capacity SOC of the battery 3.

The control mode of the hybrid vehicle includes:
There are “idle stop mode”, “idle mode”, “deceleration mode”, “acceleration mode”, and “cruise mode”.

<Motor operation mode determination> The following describes the motor operation mode determination for determining each of the above modes based on the flowcharts of FIGS. Step S0
At 01, it is determined whether or not the flag value of the MT / CVT determination flag F_AT is "1". The judgment result is "N
O ", that is, when it is determined that the vehicle is an MT vehicle, the process proceeds to step S002. If the result of the determination in step S001 is "YES", that is, if it is determined that the vehicle is a CVT vehicle, the flow proceeds to step S010, where it is determined whether or not the value of the CVT in-gear determination flag F_ATNP is "1". If the determination result in step S010 is “N
O ", that is, when it is determined that the vehicle is in gear, the switchback flag F_VS is determined in step S010A.
By checking the state of WB, it is determined whether or not switchback is being performed (shift lever is being operated). If the result of the determination in step S010A is "NO", that is, if switchback is not being performed, the process proceeds to step S004. Step S010
When the determination result in A is “YES”, that is, when the switchback is being performed, the process proceeds to “idle mode” in step S022, and the control ends. In the idle mode, the fuel supply following the fuel cut is restarted and the engine E
Are kept idle.

If the result of the determination in step S010 is "YES", that is, if it is determined that the engine is in the N or P range, the flow proceeds to step S014 to determine whether the flag value of the engine stop control execution flag F_FCMG is "1". Is determined. If the determination result in step S014 is “N
If "O", the process proceeds to step S022. Step S
If the determination at 014 is "YES", the flow proceeds to step S023, shifts to the "idle stop mode", and ends the control. In the idle stop mode, the engine is stopped under certain conditions, for example, when the vehicle stops.

In step S002, the flag value of the neutral position determination flag F_NSW is "1".
Is determined. When the result of the determination in step S002 is "YES", that is, when it is determined that the vehicle is in the neutral position, the process proceeds to step S014. If the result of the determination in step S002 is "NO", that is, it is determined that the vehicle is in gear, the process proceeds to step S003, where it is determined whether the flag value of the clutch connection determination flag F_CLSW is "1". If the result of the determination is "YES" and the clutch is determined to be "disengaged", the flow proceeds to step S014. If it is determined that the determination result in step S003 is “NO” and the clutch is “engaged”, the process proceeds to step S004.

In step S004, it is determined whether or not the flag value of the IDLE determination flag F_THIDLMG is "1". If the result of the determination is "NO", that is, if it is determined that the throttle is fully closed, the flow proceeds to step S011.
If the result of the determination in step S004 is "YES", that is, if it is determined that the throttle is not fully closed, the flow proceeds to step S005, and the motor assist assist determination flag F
It is determined whether or not the flag value of _MAST is “1”. If the result of the determination in step S005 is "NO", the flow proceeds to step S011. If the result of the determination in step S005 is "YES",
Proceed to 006.

In step S011, MT / CV
It is determined whether or not the flag value of the T determination flag F_AT is “1”. If the result of the determination is "NO", that is, if it is determined that the vehicle is an MT vehicle, the flow proceeds to step S013. The result of the determination in step S011 is “YES”, that is, CVT
When it is determined that the vehicle is a car, the process proceeds to step S012,
It is determined whether or not the flag value of the reverse position determination flag F_ATPR is “1”. If the judgment result is "YE
S ", that is, in the case of the reverse position, the process proceeds to step S022. If the result of the determination is "NO", that is, if it is determined that the position is other than the reverse position, step S
Go to 013.

In step S006, MT / CV
It is determined whether or not the flag value of the T determination flag F_AT is “1”. If the result of the determination is "NO", that is, if it is determined that the vehicle is an MT vehicle, it is determined in step S008 whether or not the final charge command value REGENF is equal to or less than "0".
If it is determined that the value is “0” or less, step S009
To the “acceleration mode” and ends. If it is determined in step S008 that the final charge command value REGENF is larger than “0”, the control is ended.

When the determination result in step S006 is "Y
ES ”, that is, when it is determined that the vehicle is a CVT vehicle, the process proceeds to step S007, and the brake ON determination flag F_BK
It is determined whether or not the SW flag value is “1”. If the result of the determination in step S007 is “YES”, that is, if it is determined that the brake is depressed, step S
Go to 013. If the result of the determination in step S007 is "NO", that is, if it is determined that the brake has not been depressed, the flow proceeds to step S008.

In step S013, it is determined whether or not the engine control vehicle speed VP is "0". The judgment result is “Y
If “ES”, that is, the vehicle speed is determined to be 0, the process proceeds to step S014. If the result of the determination in step S013 is "NO", that is, if it is determined that the vehicle speed is not 0, the flow proceeds to step S015. In step S015, it is determined whether or not the flag value of the engine stop control execution flag F_FCMG is “1”. If the determination result in step S015 is “NO”, step S01
Proceed to 6. In step S015, the flag value is “1”
If it is determined to be, the process proceeds to step S023. In step S016, the engine speed NE and the cruise / deceleration mode lower limit engine speed #NERGNLx
Compare with Here, “x” in the cruise / deceleration mode lower limit engine speed #NERGNLx is a value (including hysteresis) set in each gear.

If the result of determination in step S016 is that it is determined that the engine speed NE ≦ the cruise / deceleration mode lower limit engine speed #NERGNLx, that is, it is on the low rotation side, the flow proceeds to step S014. On the other hand, as a result of the determination in step S016, the engine rotational speed NE>
Cruise / deceleration mode lower limit engine speed #NERGN
If Lx, that is, it is determined to be on the high rotation side, the process proceeds to step S017. In step S017, it is determined whether the flag value of the brake ON determination flag F_BKSW is “1”. When the result of the determination in step S017 is "YES", that is, when it is determined that the brake is depressed, the flow proceeds to step S018. Step S
If the determination result in 017 is “NO”, that is, it is determined that the brake is not depressed, step S019
Proceed to.

In step S018, it is determined whether or not the flag value of the IDLE determination flag F_THIDLMG is "1". If the result of the determination is "NO", that is, if it is determined that the throttle is fully closed, the flow proceeds to the "deceleration mode" in step S024, and the control is terminated. In the deceleration mode, regenerative braking by the motor M is performed. Step S018
Is "YES", that is, if it is determined that the throttle is not fully closed, the process proceeds to step S019.

In step S019, it is determined whether or not the flag value of the fuel cut execution flag F_FC is "1". When the result of the determination is "YES", that is, when it is determined that the fuel is being cut, step S024 is performed.
Proceed to. If the decision result in the step S019 is “NO”, the process proceeds to a step S020, where the final assist command value A is set.
A subtraction process of STPWRF is performed, and furthermore, step S0
At 21, it is determined whether or not the final assist command value ASTPWRF is equal to or less than "0", and if it is determined that it is equal to or less than "0", the process proceeds to "cruise mode" in step S025. In this cruise mode, the motor M is not driven and the vehicle runs with the driving force of the engine E. Step S021
When it is determined that the final assist command value ASTPWRF is larger than "0" in the control, the control is ended.

<Zoning of Remaining Battery Capacity SOC> Next, zoning of the remaining battery capacity SOC (so-called remaining capacity zoning) will be described. The remaining capacity of the battery is calculated by the battery ECU 31, and is calculated based on, for example, voltage, discharge current, temperature, and the like.

An example of this will be described. Zone A (SOC 40% to SOC 80% to 90%) which is a normally used area is used.
%), The zone B (from SOC 20% to SOC 40%), which is a provisional use area, is provided below the area B.
Zone C which is an overdischarge area (from SOC 0% to SOC 20
%) Are sectioned. Above zone A, zone D, which is an overcharge area (SOC 80% to 90% to 100%).
%) Is provided. The detection of the remaining battery charge SOC in each zone is performed by integrating current values in zones A and B, and is performed by detecting a voltage value and the like due to the characteristics of the battery in zones C and D. The boundaries between the zones have upper and lower thresholds, and the thresholds are set differently when the remaining battery charge SOC increases and when the SOC decreases.

FIG. 4 is a flow chart for performing a discharge depth limit determination. First, in step S050, it is determined whether or not the flag value of the start switch determination flag F_STS is “1”, that is, whether or not it is the start time of the first running. When the result of the determination is "1", that is, when it is determined that the vehicle is traveling for the first time, the initial value SOCINT of the remaining battery charge SOC at the start of traveling is read in step S057.
Next, in step S058, the remaining battery charge SO
It is determined whether or not the initial value SOCINT of C is smaller than the discharge depth limit initial lower limit value #SOCINTL. still,
The discharge depth limit initial lower limit value #SOCINTL is, for example, 50%.

If the determination result in step S058 is "Y
ES ”, that is, the initial value S of the remaining battery charge SOC
OCINT <discharge depth limit initial lower limit #SOCINTL
If it is determined that the battery capacity is low (the battery capacity is low), the process proceeds to step S059, and the initial value of the remaining battery charge SOC is substituted with the initial lower limit of the depth of discharge limitation #SOCINTL, and the process proceeds to step S060. In other words, when the discharge depth limit initial lower limit value #SOCINTL is set to, for example, 50%, and when the remaining battery charge SOC falls below 50%,
That is, 50% is substituted for the initial value of the remaining battery charge SOC. In addition, the determination result in step S058 is “N
O ", that is, the initial value SO of the remaining battery charge SOC
The process also proceeds to step S060 when it is determined that CINT ≧ discharge depth limit initial lower limit value #SOCINTL (when the capacity is high).

In step S060, a lower limit threshold value SOCLMTL is set based on the initial value SOCINT of the remaining battery charge SOC, and then in step S061.
Sets the upper threshold SOCLMTH (see FIG. 5). Here, the discharge depth limit value #DODLMT for determining the lower threshold value SOCLMTL is, for example, about 10% in terms of the remaining battery charge SOC, and depends on the individual properties of the battery 3, and the discharge depth limit value for determining the upper threshold value SOCLMTH. The value release SOC increase value #SOCUP is, for example, about 5% in terms of the remaining battery charge SOC.

Therefore, for example, the remaining battery charge SO
When the initial value SOCINT of C is 55%, the lower threshold SOCLMTL is 45%, and the upper threshold SOCLMTH is 60%. If the initial value of the remaining battery charge SOC is 40%, step S0
At 59, for example, 5
Since 0% is substituted, the lower threshold SOCLMTL is 40
%, And the upper threshold SOCLMTH is 55%.

As described above, when the initial value of the remaining battery charge SOC is equal to or less than the initial lower limit value of the discharge depth limit #SOCINTL, the initial lower limit value #SOCINTL of the discharge depth limit is substituted for the initial value of the remaining battery charge SOC. By increasing the value, the depth up to the lower threshold SOCLMTL can be reduced. Therefore, when the remaining battery charge SOC at the start is small, that is, when the SOC is equal to or less than the initial depth of discharge limit lower limit #SOCINTL, the time until the start of the depth of discharge limit control is shortened.
Depending on the initial value of the state of charge of the battery SOC, the state of charge of the battery can be quickly recovered by entering the discharge depth limit control at the same time as the start.

Next, in step S062, "0" is set to the previous DOD limit determination flag F_DODLMT, and the setting of the previous discharge depth limit control mode is canceled.
Then, the process proceeds to step S063. In step S063, the control is terminated after obtaining the depth of discharge DOD indicating how much the current value SOC of the remaining battery charge is discharged from the initial value SOCINT. That is, the depth of discharge DOD is equal to the DOD limit determination flag F_DODLM.
This is obtained regardless of the flag value of T.

If the start switch determination flag F_STS is determined to be "0" in step S050 after starting running, it is determined in step S051 whether or not the energy storage zone D determination flag is "1". If “NO”, that is, if the zone is other than zone D, the process proceeds to step S052. If the decision result in the step S051 is "YES", that is, if it is the zone D, the step S051 is executed.
Proceed to 062. In the next step S052, the current remaining battery charge SOC becomes the discharge depth limit execution upper limit value SOCU.
It is determined whether it is greater than PH. If the judgment result is "YE
S ", that is, when it is determined that the current remaining battery charge SOC> the discharge depth limit execution upper limit value SOCUPH (when the battery has a high capacity), the process proceeds to step S056. The decision result in the step S052 is "NO", that is, the current remaining battery charge SOC ≦ the upper limit value SOCUPH for performing the discharge depth limitation.
Is determined (when the capacity is low), the process proceeds to step S053. The discharge depth limit execution upper limit value SOCUPH is set to, for example, 70%.

At the next step S053, it is determined whether or not the remaining battery charge SOC is smaller than the lower limit threshold SOCLMTL. If the determination result is “YES”, that is, if it is determined that the remaining battery charge SOC <lower threshold SOCLMTL (if the battery has a low capacity), the DOD limit determination flag F_DODLMT is set to “1” in step S054, and the discharge depth is set. The restriction control mode is set, and the flow advances to step S063. As a result, a control is performed in the assist trigger determination such as a related mode described later in the motor operation mode determination, and in accordance with the state of the DOD limit determination flag F_DODLMT in the second and third embodiments.

Here, when the control enters the depth-of-discharge limit control mode, as shown in FIG. 5, power is generated such that the remaining battery charge SOC increases. In step S053, the remaining battery charge SOC ≧ the lower threshold SOCLMTL, that is, If it is determined that the remaining battery charge SOC is equal to or greater than the lower threshold SOCLMTL (if the battery has a high capacity), the DOD limit determination flag F_DOD is determined in step S055.
Determine the state of LMT.

If the result of the determination in step S055 is "Y
ES ", that is, when it is determined that the discharge depth limit control mode is set, in step S056, the remaining battery charge SOC> the upper limit threshold SOCLMTH,
That is, the remaining battery charge SOC becomes the upper threshold SOCLMT.
It is determined whether it is larger than H or not. In step S056, the remaining battery charge SOC> upper limit threshold SOCLMT
H, that is, the remaining battery charge SOC is at the upper threshold SOC.
If it is determined that it is larger than LMTH (high capacity), the process proceeds to step S057, where the initial value SOCINT of the remaining battery charge SOC and the upper limit threshold SO corresponding thereto are set.
CLMTH and the lower threshold SOCLMTL are updated. The increase in the remaining battery charge SOC due to this update is continued until the remaining battery charge SOC becomes the D zone in step S051. Therefore, the remaining battery capacity SOC is promptly
And charging can be prevented from being performed more than necessary.

In step S055, when the flag value of the DOD limit determination flag F_DODLMT is "0", that is, when the setting of the discharge depth limit control mode is cancelled, or in step S056, the remaining battery charge SOC ≦ the upper threshold SOCLMTH, that is, the battery If it is determined that the remaining capacity SOC is equal to or lower than the upper threshold SOCLMTH (if the remaining capacity is low), step S06 is performed.
Proceed to 3.

Next, the specific contents of such a discharge depth limit control mode will be described. The discharge depth limit control mode is related to “assist trigger determination” described later, and the details thereof will be described below.

[Assist Trigger Determination] FIGS. 6 and 7 are flowcharts of assist trigger determination, specifically, flowcharts for determining the assist / cruise mode based on the region. Step S1
At 00, the energy storage thorn C flag F_
It is determined whether the flag value of ESZONEC is “1”.
If the result of the determination is "YES", that is, if it is determined that the remaining battery charge SOC is in the C zone, it is determined in step S136 whether the final assist command value ASTPWRF is equal to or less than zero. Step S13 the determination result in 6 is "YES", that the final assist command value ASTOW
If it is determined that RF is equal to or less than 0, step S1
At 37, 1.0 is substituted for the cruise power generation amount subtraction coefficient KTRGRGN, and at step S122, "0" is substituted for the motor assist determination flag F_MAST, and the routine returns.

If the result of the determination in steps S100 and S136 is "NO", a start assist trigger determination is made in step S101. This start assist trigger determination processing aims at improving the start performance,
This is a process for calculating the assist trigger value and the assist amount separately from the normal assist amount when the intake pipe negative pressure PB starts at a high negative pressure equal to or higher than a predetermined pressure. As a result of the process, the start assist control is required. If it is determined, "1" is set to the start assist request flag F_MASTSTR.
Next, a scramble assist trigger determination is made in step S102. This scramble assist trigger determination process is a process for improving the feeling of acceleration by temporarily increasing the assist amount during acceleration. Basically, when the change amount of the throttle is large, the scramble assist request flag F_MASTSCR is set to ""1" is assigned. Then, the next step S10
At 3, the calculation processing of the throttle assist trigger correction value DTHAST is performed. The processing content will be described later.

Next, in step S104, a threshold value MTHASTN as a reference of the throttle assist trigger is searched from the throttle assist trigger table. As shown by a solid line in FIG. 8, the throttle assist trigger table includes a throttle opening threshold value MTH which is a reference for determining whether or not to perform motor assist with respect to the engine speed NE.
ASTN is set, and a threshold value is set according to the engine speed NE.

Next step S105, step S106
The high throttle assist trigger threshold MTHASTH is calculated by adding the correction value DTHAST calculated in step S103 to the throttle assist trigger reference threshold MTHASTN obtained in step S104, and the high throttle assist trigger threshold MTHTH is obtained.
Difference #DM for setting hysteresis from ASTH
THAST is subtracted to obtain a low throttle assist trigger threshold value MTHASTL. When these high / low throttle assist trigger thresholds are described in a manner superimposed on the reference threshold MTHASTN in the throttle assist trigger table of FIG. 8, they are indicated by broken lines.

In step S107, the current value THEM of the throttle opening is set to the throttle assist trigger threshold M obtained in steps S105 and S106.
It is determined whether or not THAST or more. The throttle assist trigger threshold value MTHAST in this case is a value having the above-described hysteresis, and is high when the throttle opening is increasing, and is low when the throttle opening is small. Assist trigger threshold MTHAST
L is referred to respectively.

If the result of the determination in step S107 is "YES", that is, if the current value of the throttle opening THEM is equal to the throttle assist trigger threshold MTHAST
If it is equal to or greater than (threshold for setting the high / low hysteresis), the determination result is "NO" in step S109, that is, the current value of the throttle opening THEM is equal to or greater than the throttle assist trigger threshold MTHAST (threshold for setting the high / low hysteresis). If not, the process proceeds to step S108. In step S109, the throttle motor assist determination flag F_MASTTH is set to "1", while in step S108, the throttle motor assist determination flag F_MASTTH is set to "0".

In the processing so far, it is determined whether or not the throttle opening TH is an opening that requires motor assist. In step S107, the current value of the throttle opening THEM is set to the throttle assist trigger threshold. MTH
When it is determined that the value is equal to or higher than AST, the throttle motor assist determination flag F_MASTTH is set to “1”, and by reading this flag in the “acceleration mode”, it is determined that the motor assist is required.

On the other hand, the fact that "0" is set to the throttle motor assist determination flag F_MASTTH in step S108 indicates that it is not in the region of the motor assist determination based on the throttle opening. In this embodiment, the assist trigger is determined based on both the throttle opening TH and the engine intake pipe negative pressure PB. When the current throttle opening THEM is equal to or greater than the throttle assist trigger threshold MTHAST. Is determined based on the throttle opening TH, and in a region not exceeding the threshold value, a determination is made based on the intake pipe negative pressure PB described later. Then, in step S109,
Throttle motor assist determination flag F_MASTTH
Is set to "1", the process proceeds to step S134 to deviate from the normal assist determination, the cruise generation amount subtraction coefficient KTRGRGN is set to "0", and in the next step S135, the motor assist determination flag F_MAST is set to "1". Set and return.

On the other hand, in step S110, MT
It is determined whether or not the flag value of the / CVT determination flag F_AT is “1”. If the result of the determination is "NO", that is, if it is determined that the vehicle is an MT vehicle, the flow proceeds to step S111. If the result of the determination in step S110 is "YES", that is, if it is determined that the vehicle is a CVT vehicle, the flow proceeds to step S123. In step S111, a process of calculating the intake pipe negative pressure assist trigger correction value DPBAST is performed. The processing content will be described later.

Next, in step S112, a threshold value MASTL / H of the intake pipe negative pressure assist trigger is retrieved from the intake pipe negative pressure assist trigger table. This intake pipe negative pressure assist trigger table, as shown by two solid lines in FIG.
High intake pipe negative pressure assist trigger threshold MA for determining whether or not to perform motor assist with respect to engine speed NE
STH and low intake pipe negative pressure assist trigger threshold MASTL
In the search process of step S112, the high threshold line MA of FIG. 9 is changed in response to an increase in the intake pipe negative pressure PBA or a decrease in the engine speed NE.
When passing through STH from the bottom to the top, the motor assist determination flag F_MAST is set from “0” to “1”, and conversely, the motor assist determination flag F_MAST becomes low in response to a decrease in the intake pipe negative pressure PBA or an increase in the engine speed NE. When the vehicle passes the threshold line MASTL from top to bottom, the motor assist determination flag F_MA
ST is set from “1” to “0”. In FIG. 9, the gear is changed for each gear and for each stoichiometric / lean burn.

Then, in the next step S113, it is determined whether or not the flag value of the motor assist determination flag F_MAST is "1". If the determination result is "1", the process proceeds to step S114 and the determination result becomes "1". If not “1”, the process proceeds to step S115. Then, in step S114, the intake pipe assist trigger threshold value MAST is determined by subtracting the intake pipe negative pressure assist trigger low threshold value MASTL retrieved in step S112 from the correction value DP calculated in step S111.
Calculated as a value obtained by adding BAST and BAST and step S116
In step S1, the current value PBA of the intake pipe negative pressure is
It is determined whether or not it is equal to or greater than the intake pipe assist trigger threshold value MAST obtained in 14. If the determination is "YES", the flow proceeds to step S134. If the determination is "NO", the flow proceeds to step S117. In step S115, the intake pipe assist trigger threshold value MAST is set in step S115.
High threshold M of the intake pipe negative pressure assist trigger searched at 112
ASTH and the correction value DPB calculated in step S111
AST is added to the value, and the process proceeds to step S116.

Then, in step S117, it is determined whether or not the start assist request flag F_MASTSTR is "1". If the result of the determination is "YES", the flow proceeds to step S134. If the determination is "NO", the flow proceeds to step S118. In step S118, it is determined whether or not the scramble assist request flag F_MASTSCR is "1", and if the result of the determination is "YES", the flow proceeds to step S134. The judgment result is "N
If "O", the process proceeds to step S119.

Next, in step S119, FIG.
0, the intake pipe negative pressure assist trigger threshold MA
From ST, a delta value #DCRSPB of a predetermined intake pipe negative pressure
By subtracting (for example, 100 mmHg), the final intake pipe negative pressure assist trigger lower limit threshold value MASTFL is obtained. Next, in step S120, the final intake pipe negative pressure assist trigger lower limit threshold value MASTFL and the intake pipe negative pressure assist trigger threshold value MAST are interpolated with the current intake pipe negative pressure value PBA as shown in FIG. An amount subtraction coefficient table value KPBRGN is obtained, and in step S121, the cruise power generation amount subtraction coefficient table value KPBRGN is substituted for the cruise power generation amount subtraction coefficient KTRGRGN. Then, in step S122, "0" is substituted for the motor assist determination flag F_MAST, and the routine returns.

In step S110, MT / C
The determination result of the flag value of the VT determination flag F_AT is “YE
S ", that is, when it is determined that the vehicle is a CVT vehicle, the process proceeds to step S123, and a calculation process of the intake pipe negative pressure assist trigger correction value DPBASTTH is performed. The processing content will be described later.

Next, in step S124, a threshold value MASTTHL / H of the intake pipe negative pressure assist trigger is retrieved from the intake pipe negative pressure assist trigger table. As shown by the two solid lines in FIG. 12, the intake pipe negative pressure assist trigger table includes a high intake pipe negative pressure assist trigger threshold value for determining whether to perform motor assist with respect to the engine control vehicle speed VP. MASTTHH and a low intake pipe negative pressure assist trigger threshold value MASTTHL, which are set in step S12.
In the search process of No. 4, when the high threshold line MASTTHH of FIG. 12 passes from the bottom to the top in response to the increase in the throttle opening TH or the decrease in the engine control vehicle speed VP, the motor assist determination flag F_MAST is set to “ "0" to "1", and the throttle opening TH
The motor assist determination flag F_MAST is set from "1" to "0" when the vehicle passes the low threshold line MASTTHL from the top to the bottom in accordance with the decrease of the vehicle speed or the increase of the engine control vehicle speed VP. . still,
FIG. 12 shows a change in holding for each stoichiometric / lean burn.

Then, in the next step S125, it is determined whether or not the flag value of the motor assist determination flag F_MAST is "1". If the determination result is "1", the process proceeds to step S126, and the determination result is " If not “1”, the process proceeds to step S127. In step S126, the intake pipe assist trigger threshold value MASTTH is calculated as a value obtained by adding the low threshold value MASTTHL of the intake pipe negative pressure assist trigger searched in step S124 and the correction value DPBASTTH calculated in step S123. In S128, the current value THE of the throttle opening is
It is determined whether or not M is equal to or greater than the intake pipe assist trigger threshold value MASTTH obtained in step S126. If the determination is "YES", the flow proceeds to step S134. If the determination is "NO", the flow proceeds to step S129.

At step S127, the intake pipe assist trigger threshold value MASTTH is set at step S12.
High threshold value MAS of intake pipe negative pressure assist trigger searched in 4.
TTHH and the correction value DPB calculated in step S123
ASTTH is calculated as a value obtained by adding ASTTH and step S12.
Proceed to 8.

Then, in step S129, it is determined whether or not the start assist request flag F_MASTSTR is "1". If the result of the determination is "YES", the flow proceeds to step S134. If the determination is "NO", the flow proceeds to step S130. In step S130, it is determined whether or not scramble assist request flag F_MASTSCR is "1". If the determination result is "YES", the flow proceeds to step S134. The judgment result is "N
If “O”, the process proceeds to step S131.

Next, in step S131, FIG.
0, the intake pipe negative pressure assist trigger threshold MA
From STTH, a delta value #DC of a predetermined throttle opening degree
By subtracting RSTHV, the final intake pipe negative pressure assist trigger lower limit threshold value MASTTHFL is obtained. Next, in step S132, the final intake pipe negative pressure assist trigger lower limit threshold MASTTHFL and the intake pipe negative pressure assist trigger threshold MASTTH are interpolated and calculated with the current throttle opening value THEM as shown in FIG. A subtraction coefficient table value KPBRGTTH is obtained, and step S133 is performed.
Cruise power generation amount subtraction coefficient table value KPBRG
TH is substituted for the cruise power generation amount subtraction coefficient KTRGRGN. Then, in step S122, "0" is substituted for the motor assist determination flag F_MAST, and the routine returns.

[TH Assist Trigger Correction] FIG. 13 is a flowchart of the throttle assist trigger correction in step S103. Step S1
At 50, an atmospheric pressure correction value (D
THAPA). As shown in FIG. 14, this correction is a table search for a correction value set in the throttle assist trigger PA correction table so that the correction value decreases as going from a high altitude to a low altitude. The atmospheric pressure correction value DTHPAA is obtained by this table search.

Next, in step S151, it is determined whether or not a restriction process is performed on the depth of discharge DOD of the battery.
The determination is made based on whether or not the D limit determination flag F_DODLMT is “1”. Then, when the mode is the discharge depth limit control mode, the DOD limit control mode correction value #DTHDOD is searched in a table based on FIG. 15 in step S152, and is substituted into the DOD limit control mode correction value DTHDOD.

On the other hand, if the discharge depth limit control mode has been canceled, the process proceeds to the next step S153, and "0" is substituted for the DOD limit control mode correction value DTHDOD. In this case, the predetermined value #DTHDOD is set to a positive value to increase the determination value for the motor assist, and is corrected so as to reduce the frequency of the motor assist in the discharge depth limit control mode. . Therefore,
In the discharge depth limit control mode, the frequency of entering the assist can be suppressed, so that the remaining battery charge SOC
Can be quickly recovered. Next, step S1
At 54, the throttle assist trigger DOD correction amount corresponding to the control vehicle speed VP The vehicle speed correction coefficient KVDTHDOD is obtained by a table search as shown in FIG. Note that the throttle assist trigger DOD increases as the control vehicle speed increases.
The correction amount vehicle speed correction coefficient KVDTHDOD becomes smaller.

Then, in the next step S155,
Atmospheric pressure correction value DTHPA obtained in step S150
And the DOD limit control mode correction value DTHDOD obtained in step S152 or S153
The value obtained by multiplying the throttle assist trigger DOD correction amount obtained in 154 by the vehicle speed correction coefficient KVDTHDOD is added to obtain the throttle assist trigger correction value DTHAST, and the processing ends. Therefore, when the vehicle speed is low due to traffic congestion or the like, if regeneration cannot be ensured by repeatedly starting and stopping, the assist trigger threshold is raised by increasing the throttle assist trigger DOD correction amount vehicle speed correction coefficient KVDTHDOD in the discharge depth limit mode. In addition, it is possible to quickly recover the remaining battery capacity in the discharge depth limitation mode.

[PB assist trigger correction (MT)] FIG.
FIG. 7 is a flowchart of the intake pipe negative pressure throttle assist trigger correction in step S111. In step S160, a search for an atmospheric pressure correction value (DPBAPA) corresponding to the atmospheric pressure is performed. This correction is shown in FIG.
As shown in FIG. 8, in the intake pipe negative pressure assist trigger PA correction table, the table is searched for a correction value set so as to decrease as going from a high altitude to a low altitude. The atmospheric pressure correction value DPBAPA is obtained by this table search.

Next, in step S161, it is determined whether or not a restriction process is performed on the depth of discharge DOD of the battery.
The determination is made based on whether or not the D limit determination flag F_DODLMT is “1”. Then, when the mode is the discharge depth limit control mode, the DOD limit control mode correction value #DPBDOD is searched in a table based on FIG. 19 in step S162, and is substituted into the DOD limit control mode correction value DPBDOD. On the other hand, if the discharge depth limit control mode has been canceled, the process proceeds to the next step S163, and “0” is substituted for the DOD limit control mode correction value DPBDOD. The predetermined value #DPBDOD in this case is set to a positive value so as to increase the determination value for motor assist, and is corrected so as to reduce the frequency of motor assist in the discharge depth limit control mode. . Therefore, in the discharge depth limit control mode, the frequency of entering the assist can be suppressed, and the remaining battery charge SOC can be quickly recovered. Next, step S16
In 4, the throttle assist trigger DOD correction amount corresponding to the control vehicle speed VP The vehicle speed correction coefficient KVDPBDOD is obtained by a table search as shown in FIG.

Then, in the next step S165,
Atmospheric pressure correction value DPBAPA obtained in step S160
To the DOD limit control mode correction value DPBDOD obtained in step S162 or S163.
The throttle assist trigger DOD correction amount obtained at 164 is multiplied by the vehicle speed correction coefficient KVDPBDOD, and a throttle assist trigger correction value DPBAST is obtained. Therefore, when the vehicle speed is low due to traffic congestion or the like, when the regeneration cannot be secured by repeating the start and stop, the assist trigger threshold is raised in the depth of discharge limitation mode to quickly recover the remaining capacity of the battery in the depth of discharge limitation mode. Can do it.

[PB Assist Trigger Correction (CVT)] FIG. 21 is a flowchart of the intake pipe negative pressure throttle assist trigger correction in step S123. In step S170, an atmospheric pressure correction value (DPBAPATH) corresponding to the atmospheric pressure is searched. This correction is performed as shown in FIG.
In the correction table, a table search is performed for a correction value set so as to decrease as going from a highland to a lowland.
By searching this table, the atmospheric pressure correction value DPBAPATH is obtained.
Is required.

Next, in step S171, it is determined whether or not a restriction process is performed on the depth of discharge DOD of the battery.
The determination is made based on whether or not the D limit determination flag F_DODLMT is “1”. Then, when in the discharge depth limit control mode, the DOD limit control mode correction value #DPBDODTH is searched in a table based on FIG. 23 in step S172, and the DOD limit control mode correction value DPBDO is determined.
Substitute for DTH. On the other hand, if the discharge depth limit control mode has been released, the process proceeds to the next step S173, where DO
“0” is substituted for the D limit control mode correction value DPBDODTH. The predetermined value #DPBDODTH in this case is set to a positive value to increase the determination value for motor assist, and is corrected to reduce the frequency of motor assist when in the discharge depth limit control mode. . Therefore, in the discharge depth limit control mode, the frequency of entering the assist can be suppressed, and the remaining battery charge SOC can be quickly recovered.

Next, in step S174, a throttle assist trigger DOD correction amount vehicle speed correction coefficient KVDPBDOD corresponding to the control vehicle speed VP is obtained by a table search as shown in FIG.

Then, in the next step S175,
Atmospheric pressure correction value DPBAPAT obtained in step S170
H and the throttle assist trigger DOD calculated in step S174 with the DOD limit control mode correction value DPBDODTH calculated in step S172 or S173.
A correction amount is multiplied by a vehicle speed correction coefficient KVDPBDOD to add a throttle assist trigger correction value DPBASTT.
Find H and end. Therefore, when the vehicle speed is low due to traffic congestion or the like, when the regeneration cannot be secured by repeating the start and stop, the assist trigger threshold is raised in the depth of discharge limitation mode to quickly recover the remaining capacity of the battery in the depth of discharge limitation mode. Can do it.

Therefore, according to the above-described embodiment, the battery is quickly recovered in accordance with the depth of discharge by increasing the assist trigger threshold according to the depth of discharge and increasing the cruise frequency, particularly when the apparatus is in the depth of discharge limiting mode. can do. In addition, when setting the correction value of the assist trigger, a correction value corresponding to the vehicle speed (the lower the vehicle speed, the higher the assist trigger threshold value) is set, so that the start stop is frequently repeated in a traffic jam or the like. Even in a case where regeneration cannot be sufficiently ensured, such as in high-speed running, the remaining capacity of the battery can be set in the recovery direction.

Next, a second embodiment of the present invention will be described.
This will be described with reference to FIGS. In this embodiment, the assist amount is adjusted in the acceleration mode instead of correcting the assist trigger threshold when the DOD limit determination flag F_DODLMT is “1” in the discharge depth limit mode described above. Specifically, the final assist command value ASTPWRF in the acceleration mode
Is set, the assist amount is reduced in the discharge depth limitation mode. Hereinafter, description will be made focusing on the flowcharts of FIGS.

In step S200, it is determined whether or not the vehicle is in the acceleration mode. If it is determined that the vehicle is not in the acceleration mode, the final assist command value ASTPW is determined in step S201.
RF is set to “0”, and the process proceeds to step S203. If the result of determination in step S200 is that the vehicle is in the acceleration mode, the final assist command value ASTPWRF is added to the normal assist final calculated value ACCASTF in step S202.
And proceeds to step S203.

In step S203, a normal assist calculation process is performed. In step S204, a start assist calculation process is performed. In step S205, a scramble assist calculation process is performed, and the respective assist amounts are calculated. Then, in step S206, the start assist permission flag F_STRAST is set to “1”.
It is determined whether or not. If the result of the determination is "YES", the flow proceeds to step S213, where it is determined whether or not the scramble assist permission flag F_SCRAST is "1". If the result of the determination in step S213 is "YES", the flow proceeds to step S214, in which it is determined whether the final scramble assist calculation value SCRASTF is larger than the final start assist calculation value STRASTF. If the result of the determination in step S214 is "YES", the flow proceeds to step S208. If the determination result in step S214 is “NO”, then in step S213, “N
The process proceeds to step S215 as in the case of "O".

When the result of the determination in step S206 is "N
If “O”, the process proceeds to step S207 to determine whether or not the scramble assist permission flag F_SCRAST is “1”. If the determination is "YES", the flow proceeds to step S208. If the result of the determination in step S207 is "NO", the flow proceeds to step S211. In step S215, the final normal assist calculation value ACCAST
It is determined whether or not F is larger than the final start assist calculation value STRASTF. If the determination is "YES", the flow proceeds to step S211. If the determination is "NO", the flow proceeds to step S216.

In step S208, it is determined whether the final normal assist calculation value ACCASTF is greater than the final scramble assist calculation value SCRASTF. If the determination is "YES", the flow proceeds to step S211. If the determination is "NO", the flow proceeds to step S209. Then, at step S216, the final start assist calculation value ST is added to the final assist command value ASTPWRF.
RASTF is substituted. In step S211, the final normal assist calculation value ACCASTF is substituted for the final assist command value ASTPWRF. In step S209, the final scramble assist calculation value SCRASTF is substituted for the final assist command value ASTPWRF. Therefore, the final start assist calculation value STRASTF, the final normal assist calculation value ACCA
STF, final scramble assist calculation value SCRAST
Among F, the largest numerical value is set.

Then, steps S209 and S2
11. When a predetermined assist amount is set in the final assist command value ASTPWRF in any one of Step S216 and Step S216, as shown in FIG. 26, an assist amount upper limit ASTVHG is determined by a table search in Step S217 according to the control vehicle speed VP as shown in FIG. Ask. Next, in step S218, as shown in FIG.
The correction coefficient #KAPDOD (a value smaller than 1) is obtained by searching a table, and in step S219, the DOD correction coefficient KAPDO is added to the final assist command value ASTP W RF.
Multiply D and proceed to step S220.

Then, in step S220, the final assist command value ASTPWRF is changed to the assist amount upper limit value AST.
It is determined whether it is VHG or more. If the result of the determination is "YES", the assist amount upper limit ASTVHG is set to the final assist command value ASTPWRF in step S221, and "0" is set to the final power generation amount in step S222. Set and return. If the result of the determination in step S220 is "NO", the flow proceeds to step S222 and returns.

Therefore, in the acceleration mode, in the discharge depth limit mode, the final assist command value ASTPWRF can be reduced in accordance with the discharge depth DOD, so that the assist amount in the acceleration mode is reduced, and the remaining battery capacity is reduced. It can contribute to quick recovery. In particular, when the vehicle travels repeatedly to start and stop due to traffic congestion or the like, it is not possible to secure sufficient regeneration, and it is expected that the remaining capacity of the battery can be recovered by reducing the assist amount. In this embodiment, the assist trigger threshold can be raised in the first embodiment.

Next, a third embodiment of the present invention will be described.
This will be described with reference to FIGS. In this embodiment, when the above-described discharge depth limit mode is set, that is, when the DOD limit determination flag F_DODLMT is “1”, the power generation amount is changed in the cruise mode instead of correcting the assist trigger threshold shown in the first embodiment. Adjusted. Specifically, in the DOD power generation mode in the cruise mode, a correction coefficient corresponding to the depth of discharge DOD is set, and when in the depth of discharge limitation mode, the amount of power generation is increased according to the depth of discharge DOD. First, FIG.
8 will be described.

In step S250 in FIG. 28, it is determined whether or not the vehicle is in the cruise mode (power generation mode). If the result of determination is that the mode is other than the cruise mode, "0" is set to the final cruise power generation amount CRSRGNF in step S251, and the flow proceeds to step S253. If the result of determination in step S250 is that the cruise mode is set, in step S252, the final charge command value REGENF is set to the final cruise power generation amount CRSRGNF, and step S252 is performed.
Proceed to 253. In step S253, the cruise power generation amount calculation processing of FIGS. 29 and 30 described below is performed. Then, the process proceeds to step S254, and the gradual addition / subtraction timer TC
It is determined whether or not RSRGN is 0. If the determination result is "NO", the final cruise power generation amount CRSRGNNF is set to the final charge command value REGENF in step S262, and the final assist command value AS is determined in step S263.
To end the control is set to "0" to T P WRF.

If the result of the determination in step S254 is "Y
ES ”, the gradual addition / subtraction timer TCRSRGN is set to the predetermined value #TMCRSRG in step S255.
N is set and the process proceeds to step S256. Step S2
At 56, it is determined whether or not the cruise generation amount CRSRGN is equal to or greater than the final cruise generation amount CRSRGNF. If the determination result in step S256 is “YES”, in step S260, the final cruise power generation amount CR
The addition amount #DCRSRGNP is gradually added to SRGNF, and in step S261, the cruise power generation amount CR is again increased.
It is determined whether or not SRGN is equal to or greater than the final cruise power generation amount CRSRGNF. If the result of determination in step S261 is that the cruise generation amount CRSRGN is equal to or greater than the final cruise generation amount CRSRGNF, step S262 is performed.
Proceed to.

As a result of the determination in step S261, the cruise power generation amount CRSRGN becomes the final cruise power generation amount CRS.
If it is smaller than RGNF, the process proceeds to step S259, where the cruise generation amount CRSRGN is substituted for the final cruise generation amount CRSRGNNF, and the process proceeds to step S262. If the decision result in the step S256 is "NO", in a step S257, the subtraction amount #DCRSRGNM is gradually subtracted from the final cruise generation amount CRSRGNF. It is determined whether or not there is. If the result of determination in step S258 is that the cruise generation amount CRSRGN has become greater than the final cruise generation amount CRSRGNF, the flow proceeds to step S259. If the result of determination in step S258 is that the final cruise power generation amount CRSRGNF is equal to or greater than the cruise power generation amount CRSRGN, the flow proceeds to step S262. Therefore, by the process of step S254, it is possible to smoothly shift to the cruise power generation mode without a sudden change in the amount of power generation.

FIG. 29 is a flow chart for calculating the cruise power generation amount in step S253 of FIG.
This will be described with reference to FIG. In step S300, the cruise power generation amount CRSR G NM is searched on a map. This map shows the amount of power generation determined according to the engine speed NE and the intake pipe negative pressure PBGA, and is switched between CVT and MT.

Then, the process proceeds to a step S302, wherein it is determined whether or not the energy storage zone D determination flag F_ESZONED is "1". If the judgment result is "YE
S ", that is, when it is determined that the remaining battery charge SOC is in the zone D, the process proceeds to step S322, in which the cruise power generation amount CRSRGN is set to" 0 ", and the process proceeds to step S32
Proceed to 6. In step S326, it is determined whether or not final cruise power generation command value CRSRGNF is “0”. If it is determined in step S326 that the command value is not "0", the flow proceeds to step S327, shifts to the cruise power generation stop mode, and ends the control. If the result of the determination in step S326 is that the command value is "0", the flow advances to step S328 to shift to the cruise battery supply mode and end the control.

When the determination result in step S302 is "N
O ”, that is, when it is determined that the remaining battery charge SOC is outside the zone D, the process proceeds to step S303, and the energy storage zone C determination flag F_ESZONE
It is determined whether or not C is “1”. If the judgment result is "YE
S ”, that is, when it is determined that the remaining battery charge SOC is in the zone C, the process proceeds to step S304, where“ 1 ”(for the strong power generation mode) is substituted for the correction coefficient KCRSRGN of the cruise generation amount, and the process proceeds to step S316. move on. If the result of the determination in step S303 is “NO”, that is, if it is determined that the remaining battery charge SOC is outside the zone C, the process proceeds to step S305.

In step S305, it is determined whether an energy storage zone B determination flag F_ESZONEB is "1". If the judgment result is "YE
S ", that is, when it is determined that the remaining battery charge SOC is in zone B, the process proceeds to step S306. Step S
At 306, the correction coefficient KCRSR for the cruise power generation amount
The cruise power generation coefficient #KCRGNWK (for the weak power generation mode) is substituted for GN, and the process proceeds to step S313.

On the other hand, if the decision result in the step S305 is "NO", that is, if it is determined that the remaining battery charge SOC is outside the zone B, the process proceeds to a step S307.
Here, it is determined whether or not the flag value of the DOD limit determination flag F_DODLMT is “1”. If the determination result in step S307 is “YES”, step S307
The process proceeds to 307A, where the cruise power generation coefficient #KCRGNDOD (for the DOD limited power generation mode) corresponding to the depth of discharge DOD is searched for a map as shown in FIG. 31, and the process proceeds to step S308 to correct the cruise power generation correction coefficient KCRSR.
The cruise generation coefficient #KCRGNDOD (DOD
(For the limited power generation mode), and the process proceeds to step S313.

As a result, it is possible to quickly recover the remaining battery charge SOC with the power generation amount that is increased from the normal amount and increased according to the depth of discharge DOD.
On the other hand, if the result of the determination in step S307 is "NO", the flow proceeds to step S309, and it is determined whether or not the flag value of the air conditioner ON flag F_ACC is "1". If the result of the determination is "YES", that is, if it is determined that the air conditioner is "ON", the process proceeds to step S310, where the cruise power generation amount coefficient #KCRGNHAAC (for the HAC_ON power generation mode) is substituted for the cruise power generation correction coefficient KCRSRGN, Proceed to step S313.

If the result of the determination in step S309 is "N
If "O", that is, if it is determined that the air conditioner is "OFF", the flow proceeds to step S311 to determine whether the flag value of the cruise mode determination flag F_MACRS is "1". If the result of the determination in step S311 is "NO", that is, it is determined that the mode is not the cruise mode, the flow proceeds to step S323, where "0" is substituted for the cruise power generation amount CRSRGN, and the flow proceeds to step S324. If the result of the determination in step S311 is "YES", that is, if it is determined that the vehicle is in the cruise mode, the process proceeds to step S312, where the cruise power generation coefficient CRSRGN includes
CRGN (for normal power generation mode) is substituted and step S
Proceed to 313.

In step S324, it is determined whether or not engine speed NE is equal to or less than cruise battery supply mode execution upper limit engine speed #NDVSTP, and the determination result is "YES", that is, engine speed NE ≦ cruise battery supply mode execution. Upper limit engine speed #NDVST
If it is determined to be P, the process proceeds to step S325. In step S325, the downverter flag F
It is determined whether or not _DV is “1”, and the result of the determination is “YES”
If, the mode shifts to the cruise generation stop mode in step S327. If the result of the determination in step S325 is "NO", the flow proceeds to step S326. If the result of the determination in step S324 is "NO", that is, if it is determined that the engine speed NE> the cruise battery supply mode execution upper limit engine speed #NDVSTP, the flow proceeds to step S327. The cruise battery supply mode execution upper limit engine speed #NDVSTP is a value having hysteresis.

In step S313, it is determined whether or not the remaining battery charge QBAT (synonymous with SOC) is equal to or greater than the normal power generation mode execution upper limit remaining charge #QBCRSRH. Note that the normal power generation mode execution upper limit remaining capacity #QBCR
SRH is a value having hysteresis. Step S3
13 is “YES”, that is, the remaining battery charge QBAT ≧ the upper limit remaining capacity #QB of the normal power generation mode execution
If it is determined to be CRSRH, step S323
Proceed to.

When it is determined that the remaining battery charge QBAT <the normal power generation mode execution upper limit remaining battery charge #QBCRSRH, it is determined in step S314 whether or not the flag value of the lean burn determination flag F_KCMLB is "1". If the result of the determination is "YES", that is, if it is determined that the vehicle is lean burn, the value obtained by multiplying the cruise power generation correction coefficient KCRSRGN by the cruise power generation coefficient #KCRGNLB (for lean burn power generation mode) is determined in step S315. The value is substituted for the correction coefficient KCRSRGN for the amount, and the flow advances to step S316. Step S314
Is "NO", that is, it is determined that the mode is not the lean burn mode, the process proceeds to step S316.

In step S316, the cruise power generation amount subtraction coefficient KVCRSRG shown in FIG. 32 is obtained by searching the #KVCRSRG table based on the engine control vehicle speed VP. Next, in step S317, the cruise power generation amount correction value KCRSRGN and the cruise power generation amount subtraction coefficient KVCR are added to the cruise power generation map value CR S RGNM.
The value multiplied by SRG is substituted for the cruise generation amount CRSRGN. Then, the process proceeds to step S318, in which a cruise power generation amount PA correction coefficient KPACRSRN shown in FIG. 33 is obtained from the #KPACRSRN table search using the control atmospheric pressure PA.

Then, in step S319, the cruise power generation amount CRSRGN and the cruise power generation PA correction coefficient KPACRSRN and the cruise power generation amount subtraction coefficient KTRGRGN obtained in step S318 (set in step S121 of the assist trigger determination) and step S316.
The final cruise generation amount CRSRGN is obtained by multiplying by the cruise generation amount KVCRSRG obtained in step S3, and step S3
At 20, the mode shifts to the cruise charging mode. In this embodiment, it is possible to increase the assist trigger threshold value in the first embodiment or to reduce the assist amount in the acceleration mode in the second embodiment. They can be used together.

Therefore, also in this embodiment, when in the depth-of-discharge limit control mode, the amount of power generation during cruise is increased, and the correction coefficient is increased by increasing the amount of power generation as the depth of discharge DOD increases. Since the amount has been increased, the remaining capacity of the battery can be recovered.

[0096]

As described above, according to the first aspect of the present invention, the remaining capacity of the power storage device tends to discharge, and the remaining capacity of the power storage device at the start of traveling is smaller than the initial remaining capacity. When it is detected that the power storage device has decreased by a predetermined amount, the remaining capacity of the power storage device can be set in the recovery direction, so that there is an effect that the charge / discharge balance can be recovered. Further, when the remaining capacity of the power storage device is set in the recovery direction, the determination threshold value is raised by the determination threshold value correcting means according to the depth of discharge to reduce the frequency of assisting the motor to the engine to reduce the remaining capacity of the power storage device. Since the remaining capacity can be suppressed, there is an effect that recovery of the remaining capacity when the remaining capacity of the power storage device is small can be promptly performed.

According to the second aspect of the present invention, even in a case where sufficient regeneration cannot be ensured due to repetition of starting and stopping at a low vehicle speed, the determination threshold is raised according to the vehicle speed and the depth of discharge. In addition, as the remaining capacity is smaller, the frequency of the assist can be reduced and the remaining capacity of the power storage device can be corrected in the recovery direction, so that the recovery of the remaining capacity can be performed quickly.

According to the third aspect of the present invention, if the assist amount is set smaller by the assist amount changing means, or if the cruise generation amount is set larger by the cruise generation amount changing means, the remaining capacity of the power storage device can be quickly increased. This makes it possible to quickly recover the remaining capacity when the remaining capacity of the power storage device is small.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a hybrid vehicle.

FIG. 2 is a flowchart illustrating a motor operation mode determination.

FIG. 3 is a flowchart illustrating a motor operation mode determination.

FIG. 4 is a flowchart of a discharge depth limit determination.

FIG. 5 is a graph showing an SOC in a discharge depth limit control mode.

FIG. 6 is a flowchart of an assist trigger determination.

FIG. 7 is a flowchart of an assist trigger determination.

FIG. 8 is a graph showing threshold values of a TH assist mode and a PB assist mode.

FIG. 9 is a graph of a threshold value of the MT vehicle in the PB assist mode.

FIG. 10 is a graph for obtaining numerical values in steps S119 and S131.

FIG. 11 is a graph for calculation in steps S120 and S132.

FIG. 12 is a graph of a threshold value of the CVT vehicle in the PB assist mode.

FIG. 13 is a flowchart of TH assist trigger correction.

FIG. 14 is a graph of an atmospheric pressure correction table.

FIG. 15 is a graph of a correction table for discharge depth limitation control.

FIG. 16 is a graph showing a relationship between a throttle assist trigger DOD correction amount vehicle speed correction coefficient and a control vehicle speed.

FIG. 17 is a flowchart of PB assist trigger correction (MT vehicle).

FIG. 18 is a graph of an atmospheric pressure correction table.

FIG. 19 is a graph of a correction table for discharge depth limitation control.

FIG. 20 is a graph showing a relationship between a throttle assist trigger DOD correction amount vehicle speed correction coefficient and a control vehicle speed.

FIG. 21 is a flowchart of PB assist trigger correction (CVT vehicle).

FIG. 22 is a graph of an atmospheric pressure correction table.

FIG. 23 is a graph of a correction table for discharge depth limitation control.

FIG. 24 is a flowchart of an acceleration mode according to the second embodiment.

FIG. 25 is a flowchart of an acceleration mode according to the second embodiment.

FIG. 26 is a graph for obtaining an upper limit value of an assist amount according to the second embodiment.

FIG. 27 shows the DO of the final assist command value according to the second embodiment.
It is a graph figure which calculates | requires a D correction coefficient.

FIG. 28 is a flowchart of a cruise mode according to the third embodiment.

FIG. 29 is a flowchart for calculating a cruise power generation amount according to the third embodiment.

FIG. 30 is a flowchart for calculating a cruise power generation amount according to the third embodiment.

FIG. 31 is a graph for obtaining a cruise power generation amount coefficient #KCRGNDOD.

FIG. 32 is a graph for obtaining a cruise power generation amount subtraction coefficient KVCRSRG.

FIG. 33: Cruise power generation amount PA correction coefficient KPACRS
It is a graph figure which calculates RN.

[Explanation of symbols]

Reference Signs List 1 motor ECU (assist control means) 3 battery (power storage device) 31 battery ECU (remaining capacity detection means, discharge depth detection means) ASTPWRF final assist command value (assist amount) CRSRGN cruise power generation amount DOD discharge depth (discharge amount) E engine M Motor MAST Throttle assist trigger threshold (judgment threshold) MTHAST Intake pipe assist trigger threshold (judgment threshold) MASTTH Intake pipe assist trigger threshold (judgment threshold) SOC Remaining capacity SOCINT Initial value of remaining battery capacity (initial remaining capacity) SOCLMTL Lower threshold SOCLMTH Upper threshold VP control vehicle speed S005 Assist determination means S050 Travel start detection means S054 Mode setting means S060 Lower threshold setting means S061 Upper threshold setting means S062 Mode release means 152 equipped with S103, S162 with S11 and
S123 provided with S172, determination threshold correction means S154 in S103, S16 in S111
4. S174 in S123 Determination threshold value corrected in accordance with vehicle speed S209, S211, S216 Assist amount setting means S219 Assist amount changing means S307A Cruise power generation amount changing means

Continuing from the front page (72) Inventor Kazunori Sawamura 1-4-1 Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Atsushi Izumiura 1-4-1 Chuo, Wako-shi, Saitama Co., Ltd. Inside Honda R & D Co., Ltd. (72) Inventor Yasuo Nakamoto 1-4-1 Chuo, Wako-shi, Saitama Pref. Inside Honda R & D Co., Ltd. (56) References JP-A-8-317505 (JP, A) JP-A-8- 223705 (JP, A) JP-A-11-69507 (JP, A) JP-A-50-45239 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60L 11/14 B60K 6 / 02 B60L 3/00 F02D 29/02 H02P 9/14

Claims (13)

(57) [Claims] 1. An engine that outputs a propulsive force of a vehicle, a motor that generates an auxiliary driving force that assists the output of the engine, and an electric power supplied to the motor or obtained by a regenerative operation of the motor when the vehicle is decelerated. A power storage device that stores regenerative energy, an assist determination unit that determines whether or not the motor can assist the output of the engine according to the driving state of the vehicle, and a determination that the output of the engine is assisted by the motor by the assist determination unit. An assist amount setting unit that sets an assist amount of the motor in accordance with an operation state of the engine; and an assist that assists output of the motor to the engine based on the assist amount set by the assist amount setting unit. A control device for a hybrid vehicle, comprising: a control unit; Means leaving a remaining capacity detection means for calculating the remaining capacity of the power storage device, a depth of discharge detecting means for running start to detect the amount of discharge <br/> from the initial residual capacity of the power storage device when it is detected, the and the lower limit threshold value setting means for setting a lower threshold based on the initial remaining capacity, an upper limit threshold value setting means for setting an upper threshold based on the initial remaining capacity, wherein when the remaining capacity of the power storage device decreases to the lower threshold Mode setting means for changing the control of the motor; mode setting canceling means for canceling the setting of the motor control mode changed by the mode setting means when the remaining capacity of the power storage device reaches the upper limit threshold value; An engine output serving as a criterion for determination by the assist determination unit according to a discharge depth detected by the discharge depth detection unit when control of the motor is changed by the setting unit. Control apparatus for a hybrid vehicle, characterized in that a determination threshold correction means for correcting the determination threshold for aid. 2. The hybrid vehicle control device according to claim 1, wherein the determination threshold value corrected by the determination threshold value correction means is corrected according to a vehicle speed. 3. An assist amount changing unit for correcting an engine driving assist amount by a motor, or a cruise power generation amount changing unit for correcting a charge amount to a power storage device during cruise traveling, in place of the determination threshold value correcting unit. The control device for a hybrid vehicle according to claim 1, wherein: 4. An engine for outputting a propulsive force of a vehicle,
Motor that generates auxiliary driving force to assist engine output
Power supply to the motor or the motor rotation during vehicle deceleration.
Power storage device that stores regenerative energy obtained by raw operation
And An engine driven by the motor according to a driving state of the vehicle;
Assist determination means for determining whether or not output assistance is provided; The output of the engine by the motor is determined by the assist determination means.
If it is determined that power assist is to be performed,
Assist to set the assist amount of the motor according to the state
Volume setting means; Based on the assist amount set by the assist amount setting means,
And the motor assists the output to the engine.
Now assist control means and A hybrid vehicle control device comprising: Travel start detection means for detecting the start of travel of the vehicle, Remaining capacity detection means for calculating the remaining capacity of the power storage device, From the initial remaining capacity of the power storage device when running start is detected
Discharge depth detecting means for detecting the discharge amount of Set the discharge amount for the initial remaining capacity, Set the charge amount for the above initial remaining capacity, When the power storage device decreases to the discharge amount, the motor
Mode setting means for changing control; When the power storage device reaches the above-mentioned charged amount, the mode setting procedure is performed.
Releases the motor control mode setting changed by the step
Mode setting release means, When the control of the motor is changed by the mode setting means,
If the discharge depth detected by the discharge depth detection means
Accordingly, becomes a reference for determination by the assist determination means.
A judgment threshold value correcting means for correcting a judgment threshold value for engine output assistance
Step and Control device for a hybrid vehicle, comprising:
Place. 5. The correction by the determination threshold value correcting means.
The judgment threshold is corrected according to the vehicle speed.
The control device for a hybrid vehicle according to claim 4. 6. A motor according to claim 6, further comprising:
Change of assist amount to correct engine drive assist amount due to
Means or charging the power storage device during cruise
Cruise power generation change means for correcting the power
5. The hybrid vehicle control system according to claim 4, wherein
Control device. 7. The method according to claim 1, wherein the correction of the determination threshold is performed according to a depth of discharge.
The added value to a reference judgment value.
A control device for a hybrid vehicle according to claim 1 or claim 4.
Place. 8. A value according to the discharge depth is corrected by a vehicle speed.
The hybrid vehicle according to claim 7, wherein
Control device. 9. In the throttle assist trigger correction,
Is characterized in that correction is made according to the depth of discharge.
A control device for a hybrid vehicle according to claim 1 or claim 4.
Place. 10. The correction made according to the depth of discharge is
10. The correction according to the vehicle speed.
3. The control device for a hybrid vehicle according to claim 1. 11. In the intake pipe negative pressure assist trigger correction.
In addition, correction is performed according to the depth of discharge
The control of the hybrid vehicle according to claim 1 or claim 4.
apparatus. 12. The correction made according to the depth of discharge is
2. The method according to claim 1, wherein the correction is made according to the vehicle speed.
2. The control device for a hybrid vehicle according to claim 1. 13. The power storage device during cruise travel
The charge amount is corrected by the depth of discharge.
A control device for a hybrid vehicle according to claim 3 or claim 6.
Place.