CN101038030B

CN101038030B - Control device for a hybrid electric vehicle

Info

Publication number: CN101038030B
Application number: CN2007100056685A
Authority: CN
Inventors: 绪方诚; 木内达雄
Original assignee: Mitsubishi Fuso Truck and Bus Corp
Current assignee: Mitsubishi Fuso Truck and Bus Corp
Priority date: 2006-03-14
Filing date: 2007-03-13
Publication date: 2011-08-31
Anticipated expiration: 2027-03-13
Also published as: JP2007245805A; CN101038030A

Abstract

A hybrid electric vehicle (1) is arranged such that a driving force output by an engine output system and a motor/generator output system can be transmitted to driving wheels (16) through an automatic transmission (8) having a plurality of forward gears. When it is detected that a vehicle ECU (22) is in a predetermined state or the failure of the motor/generator output system is detected through a failure detection means, namely it is difficult for the motor/generator (6) to output an upper limit torque predetermined as a generable maximum torque, the vehicle ECU controls the automatic transmission (8) by controlling a gear shift map (SU2, SD2) configured such that the automatic transmission is downshifted earlier in accordance with a change in the operating state of the vehicle and up shifted later in accordance with a change in the operating state of the vehicle in comparison with a gear shift map (SU1, SD1) that is used when it is not detected that the vehicle is in the predetermined state and it is detected by the failure detection means that the motor/generator output system is normal.

Description

The control gear of motor vehicle driven by mixed power

Technical field

The present invention relates to a kind of control gear of motor vehicle driven by mixed power, particularly a kind of control gear of motor vehicle driven by mixed power of the driving wheel that the driving force of the driving force of motor and motor/generator can be passed to vehicle respectively.

Background technique

Current, the driving force of motor and the driving force of motor/generator can be passed to respectively on the driving wheel, promptly so-called parallel connection type motor vehicle driven by mixed power is being developed and practicability.

As this parallel connection type motor vehicle driven by mixed power, can thereby the driving force from motor and motor/generator both sides can be passed to the state of driving wheel at engaging clutch, and thereby cut-off clutch only is passed to the motor vehicle driven by mixed power that switches between the state of driving wheel with the driving force of motor/generator, opens in the 2004-162670 communique (hereinafter referred to as patent documentation 1) for example spy of Japan to propose.

For the motor vehicle driven by mixed power that is disclosed in the patent documentation 1, output torque at motor/generator is restricted for a certain reason, the relative necessary moment of torsion that requires of vehicle driving, under the situation of the output torque deficiency of motor/generator, ato unit, by obtaining output torque from motor simultaneously, guarantee necessary driving force.

In addition, for the motor vehicle driven by mixed power that is disclosed in the patent documentation 1, under the situation that the regenerative braking moment of torsion is restricted when regenerative braking, the rotating speed of motor/generator is risen by the gear ratio that changes speed changer.Like this, by reducing the torque protection motor/generator of motor/generator.

As mentioned above, for the motor vehicle driven by mixed power in the patent documentation 1, the moment of torsion of motor/generator is restricted when vehicle traction, requires relatively to remedy this deficiency by piloting engine under the situation of output torque deficiency of torque motor/generator.Therefore, carry out the starting of motor repeatedly and stop, existing the starting of following motor to stop and producing the problem of vibration or noise.And, thereby exist engine start to obtain essential moment of torsion position, generation time is postponed, cause the hypodynamic problem of temporary driving.Because these problems reduce the driving sensation of the motor vehicle driven by mixed power in the patent documentation 1.

When vehicle start, by motor/generator, on the basis that the possibility that can't start to walk stably raises,, above-mentioned driving force deficiency significantly reduces especially owing to causing the driving sensation only.

Summary of the invention

The present invention proposes in order to address this is that, its purpose is to provide a kind of control gear of motor vehicle driven by mixed power, even it under the situation that the output of motor/generator is restricted, can guarantee also that necessary driving force prevents to drive the reduction of sensation.

The present invention uses in motor vehicle driven by mixed power, and it can be passed to driving wheel by automatic transmission with the driving force by motor output system and the output of motor/generator output system, and this automatic transmission has a plurality of forward gear.In order to achieve the above object, control gear of the present invention possesses: control unit, it is based on the speed change corresponding diagram of regulation, the variation of corresponding travel condition of vehicle, gear to automatic transmission carries out switching controls, control gear also possesses: the export-restriction detection unit, its be used to detect motor/generator be difficult to export as its Maximum Torque that can export and the predetermined specified states that goes up limited torque; And fault detection unit, it is used to detect the motor/generator output system and fault whether occurred, control unit is when detecting specified states by the export-restriction detection unit, or when detecting the fault of motor/generator output system by fault detection unit, use following speed change corresponding diagram control automatic transmission, this speed change corresponding diagram with do not detect specified states by the export-restriction detection unit, and detecting the speed change corresponding diagram that the motor/generator output system just often uses by fault detection unit compares, carry out in advance lowering category accordingly, postpone simultaneously to carry out to upgrade accordingly with the travel condition of vehicle variation with the travel condition of vehicle variation.

In the control gear of the motor vehicle driven by mixed power that constitutes like this, if the export-restriction detection unit detect motor/generator be difficult to export as its Maximum Torque that can export and the predetermined specified states that goes up limited torque, then compare when not detecting the afore mentioned rules state, control unit carries out changing lowering category of corresponding automatic transmission with travel condition of vehicle in advance, postpones simultaneously to upgrade.

Therefore, can't make output reach the above-mentioned state of going up limited torque, also can guarantee the necessary driving force of vehicle traction even be in motor/generator.Its result can keep good cornering ability, prevents because the driving sensation that the driving force deficiency causes descends.

In addition, when not detecting the afore mentioned rules state, need not to use and considered to be in the speed change corresponding diagram that motor/generator can't be exported upper limit torque condition.Therefore, only do not use motor to compare, can upgrade in advance as the automatic transmission of the vehicle of driving source with carrying motor/generator.Its result uses motor and motor/generator at the same time and under the situation of powered vehicle, when obtaining the necessary driving force of vehicle traction, can improve the fuel economy of motor.

Preferably for than the little torque limiting of limited torque on above-mentioned the time, above-mentioned export-restriction detection unit detects to being in the afore mentioned rules state moment of torsion that can export at above-mentioned motor/generator by physical constraints.

Therefore, can detect the state that motor/generator can't be exported limited torque reliably, thereby switch the speed change corresponding diagram.

Preferred above-mentioned control gear also possesses the charge rate detection unit, it detects the charge rate to the storage battery of above-mentioned motor/generator supply capability, when above-mentioned export-restriction detection unit is lower than the lower limit charge rate of regulation in the charge rate of utilizing the detected above-mentioned storage battery of above-mentioned charge rate detection unit, detect to being in the afore mentioned rules state.

Therefore,, can predict that the output of motor/generator reduces reality, thereby switch the speed change corresponding diagram according to the reduction of charge in batteries rate.Its result can prevent the temporary driving force deficiency of following speed change corresponding diagram switching delay to produce.

The electric power upper limit that preferred above-mentioned export-restriction detection unit can be exported at above-mentioned storage battery is promptly allowed when output value is lower than regulation output, is detected to being in the afore mentioned rules state.

Therefore, allow the reduction of output value, can predict that the output of motor/generator reduces reality, thereby switch the speed change corresponding diagram according to storage battery.Its result can prevent to follow the speed change corresponding diagram to switch the temporary driving force deficiency that produces late.

Preferred above-mentioned control unit is utilizing above-mentioned export-restriction detection unit to detect under the situation of afore mentioned rules state, use is made as the gear of above-mentioned automatic transmission the speed change corresponding diagram of the 1st gear when vehicle begins to start to walk, on the other hand, utilizing above-mentioned export-restriction detection unit not detect under the situation of afore mentioned rules state, use is made as the gear of above-mentioned automatic transmission the speed change corresponding diagram of the 2nd gear when vehicle begins to start to walk, the 2nd gear is positioned at the high-speed side of above-mentioned the 1st gear.

In the control gear of the motor vehicle driven by mixed power that constitutes like this, the export-restriction detection unit detects under the situation of afore mentioned rules state when vehicle start, and control unit is made as the 1st gear with the gear of automatic transmission, thus the starting of beginning vehicle.In addition, the export-restriction detection unit does not detect under the situation of afore mentioned rules state when vehicle start, and control unit is made as the 2nd gear of the high-speed side that is positioned at the 1st gear with the gear of automatic transmission, thereby begins the starting of vehicle.

Therefore, even motor/generator can not be exported limited torque, also can guarantee the necessary driving force of vehicle start.Its result, the decline of cornering ability that the driving force deficiency causes in the time of can preventing by vehicle start and driving sensation.

In addition, when vehicle start, do not detect under the situation of afore mentioned rules state, the gear of automatic transmission is made as the 2nd gear of the high-speed side that is positioned at the 1st gear, thereby begin the starting of vehicle.Therefore, can start to walk reposefully, can quicken reposefully by the switching times that reduces gear simultaneously.

Preferred above-mentioned control gear possesses the fault detection unit that detects above-mentioned motor/generator fault, when utilizing above-mentioned fault detection unit to detect the fault of above-mentioned motor/generator, above-mentioned control unit uses following speed change corresponding diagram, above-mentioned automatic transmission is controlled, the speed change corresponding diagram that this speed change corresponding diagram is used during with the fault that do not detect above-mentioned motor/generator by above-mentioned defeated fault detection unit is compared, carry out in advance lowering category accordingly, postpone simultaneously to carry out to upgrade accordingly with above-mentioned travel condition of vehicle variation with above-mentioned travel condition of vehicle variation.

Control gear for the motor vehicle driven by mixed power of such formation, in motor/generator, detect under the out of order situation, with in motor/generator, do not detect out of order situation and compare, control unit carries out changing lowering category of corresponding automatic transmission with travel condition of vehicle in advance, postpones simultaneously to upgrade.Like this, by can switching the automatic transmission of gear, the driving force of motor is passed to driving wheel.

Therefore, even under the state of the driving force that can not obtain motor/generator owing to the fault of motor/generator, also can guarantee the necessary driving force of vehicle traction.Its result can keep good rideability, prevents because the driving sensation that the driving force deficiency causes reduces.

In addition,, in motor/generator, detect under the out of order situation, also can carry out lowering category of automatic transmission in advance according to the variation of travel condition of vehicle even when vehicle deceleration.Therefore, even can not obtain braking force, also can vehicle suitably be slowed down by the gear acquisition engine brake force that lowers category in advance from motor/generator.

Preferred above-mentioned control gear also possesses: clutch, and it can disconnect the driving force that is passed to above-mentioned automatic transmission from above-mentioned motor; And rotation speed detection unit, it detects the rotating speed of above-mentioned motor/generator, when above-mentioned vehicle deceleration, utilize above-mentioned fault detection unit not detect under the situation of above-mentioned fault, above-mentioned control unit with utilize the detected rotating speed of above-mentioned rotation speed detection unit corresponding, the regenerative braking torque setting that above-mentioned motor/generator can be produced is a upper limit deceleration torque, simultaneously the necessary deceleration torque of above-mentioned vehicle deceleration is set at and requires deceleration torque, when the above-mentioned requirements deceleration torque is less than or equal to above-mentioned upper limit deceleration torque, cut off above-mentioned clutch, controlling above-mentioned motor/generator makes it produce the above-mentioned requirements deceleration torque, on the other hand, at the above-mentioned requirements deceleration torque during greater than above-mentioned upper limit deceleration torque, engage above-mentioned clutch, and control above-mentioned motor and above-mentioned motor/generator, make from the deceleration torque of above-mentioned motor with from the summation of the regenerative braking moment of torsion of above-mentioned motor/generator and become the above-mentioned requirements deceleration torque, and when above-mentioned vehicle deceleration, utilize above-mentioned fault detection unit to detect under the situation of above-mentioned fault, above-mentioned control unit before the speed drop of above-mentioned motor is low to moderate near the idling speed, often engages above-mentioned clutch at least.

Control gear for the motor vehicle driven by mixed power of such formation, under the normal situation of motor/generator, when vehicle deceleration, control unit is corresponding to the rotating speed of motor/generator, the regenerative braking torque setting that electric generator/electric motor can be produced is a upper limit deceleration torque, the necessary deceleration torque of vehicle deceleration is set at requires deceleration torque simultaneously.If require deceleration torque to be less than or equal to upper limit deceleration torque, the control unit cut-off clutch, only by motor/generator to driving wheel delivery request deceleration torque.On the other hand, when requiring deceleration torque greater than upper limit deceleration torque, control unit engaging clutch, and control motor and motor/generator, making from the deceleration torque of motor with from the summation of the regenerative braking moment of torsion of motor/generator becomes the above-mentioned requirements deceleration torque.

Detect in motor/generator at fault detection unit under the situation of fault, when vehicle deceleration, control unit before the speed drop of motor is low to moderate near the idling speed, maintains jointing state with clutch at least.

Therefore, before the speed drop of motor is low to moderate near the idling speed, the braking force from motor can be passed to driving wheel constantly, vehicle is suitably slowed down.

Description of drawings

Fig. 1 be the related motor vehicle driven by mixed power of embodiments of the present invention want bilge construction figure.

Fig. 2 is the flow chart of the employed speed change corresponding diagram of the motor vehicle driven by mixed power among Fig. 1 switching controls.

Fig. 3 is that expression upgrades with the figure of speed change corresponding diagram SU1.

Fig. 4 is that expression upgrades with the figure of speed change corresponding diagram SU2.

Fig. 5 is that expression lowers category with the figure of speed change corresponding diagram SD1.

Fig. 6 is that expression lowers category with the figure of speed change corresponding diagram SD2.

Fig. 7 is the figure of expression motor and motor/generator output area.

Fig. 8 is the switching controls flow chart of the employed Clutch Control of motor vehicle driven by mixed power among Fig. 1.

Fig. 9 is the figure that represents the upper limit deceleration torque of motor and require to concern between the deceleration torque.

Embodiment

Below, based on accompanying drawing embodiments of the present invention are described.

What Fig. 1 was to use fuel combination vehicle 1 of the present invention wants bilge construction figure.It in diesel engine the input shaft that connects clutch 4 on the output shaft of motor 2.The output shaft of clutch 4 by the rotatingshaft of permanent-magnet synchronous electric motor/generator (below be called motor/generator) 6, is connected forward gear (below abbreviate gear as) and is on 5 grades the input shaft of automatic transmission (hereinafter referred to as speed changer) 8.The output shaft of speed changer 8 is connected on the driving wheels 16 by transmission shaft 10, differential motion 12 and live axle 14.

Therefore, when clutch 4 engages, the rotatingshaft both of the output shaft of motor 2 and motor/generator 6 can with driving wheel 16 mechanical connections.On the other hand, when clutch 4 disconnects, have only motor/generator 6 rotatingshaft can with driving wheel 16 mechanical connections.

Direct current by savings in the storage battery 18 is supplied with after being transformed to Ac via inverter 20, thus motor/generator 6 as motor work, its driving torque is to be passed to driving wheel 16 after the appropriate speed by speed changer 8 speed changes.In addition, when vehicle deceleration, motor/generator 6 after the kinetic energy that driving wheel 16 is rotated generation is passed to motor/generator 6 via speed changer 8, is transformed to Ac as generator work, and regenerative braking power produces deceleration torque thus.Then, after this Ac is transformed to direct current by inverter 20,,, driving wheel 16 reclaims as electric energy thereby being rotated the kinetic energy that produces to storage battery 18 chargings.

On the other hand, when the driving torque of motor 2 engages at clutch 4, be passed to speed changer 8 via the rotatingshaft of motor/generator 6, speed change is to be passed to driving wheel 16 after the appropriate speed.Therefore, when the driving torque of motor 2 is passed to driving wheel 16 and under the situation of motor/generator 6 as motor work, the driving torque of the driving torque of motor 2 and motor/generator 6 is passed to driving wheel 16 respectively.That is, the driving torque part that must be passed to driving wheel 16 for powered vehicle is supplied with by motor 2, and remainder is supplied with by motor/generator 6.

In addition, in the charge rate of storage battery 18 (below be called SOC) thus reduce need be to storage battery 18 chargings the time, motor/generator 6 is as generator work, thereby a part of drive motor/generator 6 of the driving torque simultaneously by using motor 2 generates electricity.Like this, the Ac that generating produces is transformed to direct current by inverter 20, utilizes this direct current that storage battery 18 is charged.

Vehicle ECU22 (control unit), corresponding to the running state of vehicle or motor 2 and from the information of Engine ECU 24, inverter ECU26 and storage battery ECU (charge rate detection unit) 28, the joint that carries out clutch 4 disconnects the gear switching controls of control and speed changer 8.In addition, suitably move in order to make motor 2 or motor/generator 6, vehicle ECU22 totally controls according to various running statees such as the starting of the state of above-mentioned control or vehicle, acceleration, decelerations.

In motor vehicle driven by mixed power 1, be provided with: accel sensor 32, it detects the depression amount of accelerator pedal 30; Vehicle speed sensor 34, it detects the travelling speed of vehicle; And speed probe (rotation speed detection unit) 36, it detects the rotating speed of motor/generator 6.Vehicle ECU22 when carrying out above-mentioned control, based on the testing result of accel sensor 32, vehicle speed sensor 34 and speed probe 36, calculation requirement driving torque and require deceleration torque.And vehicle ECU22 requires driving torque and requires deceleration torque according to this, sets moment of torsion and the motor/generator 6 necessary moments of torsion that produce that motor 2 must produce.

The starting that Engine ECU 24 is carried out motor 2 stops the necessary various controls of motor 2 self-operatings such as regeneration control of control or idle speed control or Exhaust gas purifying device (not shown).The fuel injection amount of Engine ECU 24 control motors 2 or injection opportunity etc. in addition, the moments of torsion that motor 2 produced set by vehicle ECU22, motor 2 must produce.

On the other hand, inverter ECU26 is based on must being controlled inverter 20 by the moment of torsion of motor/generator 6 generations that vehicle ECU22 sets, thereby the operation of control motor/generator 6 is as motor work or as generator work.In addition, receive output signal, the temperature of motor/generator 6 is sent to vehicle ECU22 from the temperature transducer (not shown) that is used to detect motor/generator 6 or inverter 20 temperature.And, the working state of inverter ECU26 monitoring motor/generator 6 or inverter 20, and its information is sent to vehicle ECU22.

Storage battery ECU28 detect temperature, the storage battery 18 of storage battery 18 voltage, flow through electric current between inverter 20 and the storage battery 18 etc.Storage battery ECU28 obtains the SOC of storage battery 18 according to above-mentioned testing result in addition, monitors the working state of storage battery 18 simultaneously.Storage battery ECU28 is sent to vehicle ECU22 with the SOC that obtains or the working state of storage battery with testing result.

Motor vehicle driven by mixed power 1 constitutes as mentioned above, and motor 2 and Engine ECU 24 constitute the motor output system, and motor/generator 6, storage battery 18, inverter 20, inverter ECU26 and storage battery ECU28 constitute the motor/generator output system.

In the motor vehicle driven by mixed power 1 that constitutes like this, in order to make vehicle driving, be that the summary of the control carried out of center is as described below with vehicle ECU22.

At first, suppose that vehicle is in vehicle stop state, motor 2 stops.Speed change lever (not shown) is when being positioned at neutral position, (not shown) pilots engine 2 if the driver utilizes switch starter, then vehicle ECU22 confirms that speed changer 8 is positioned at neutral position, mechanical connection between motor/generator 6 and the driving wheel 16 is disconnected, after confirming that simultaneously clutch 4 engages, to the pilot engine driving torque of 2 necessary motor/generators 6 of inverter ECU26 indication, indicate Engine ECU 24 to make motor 2 operations simultaneously.

Inverter ECU26 is based on the indication from vehicle ECU22, thereby motor/generator 6 is produced driving torque as motor work, makes motor 2 startings.At this moment, thus since Engine ECU 24 beginning to 2 startings of motor 2 fueling motors.Behind motor 2 proceed-to-sends, motor 2 carries out idle.

After piloting engine like this, when vehicle was in halted state, motor 2 was in idle state.Then, if the driver to operation such as activation point speed change lever, vehicle ECU22 cut-off clutch 4 then is made as gear when beginning to start to walk with the gear of speed changer 8 according to the speed change corresponding diagram simultaneously.And if driver's depress throttle pedal 30, then corresponding to the depression amount of utilizing accel sensor 32 detected accelerator pedals 30, vehicle ECU22 tries to achieve the driving torque that must be passed to driving wheel 16 in order to make vehicle start.Vehicle ECU22 sets the output torque of motor/generator 6 based on the gear that uses in this driving torque and the speed changer 8.

The moment of torsion that inverter ECU26 and vehicle ECU22 set is corresponding, control inverter 20 and the direct current of storage battery 18 is transformed to Ac by inverter 20 after supply with to motor/generator 6.Motor/generator 6 is owing to being supplied to Ac and as motor work, thus the generation driving torque.The driving torque of motor/generator 6 is passed to driving wheel 16 via speed changer 8, thus vehicle start.

If vehicle start also quickens, the rotating speed of motor/generator 6 rises near the idling speed of motor 2, thereby then engaging clutch can be passed to driving wheel with the driving force of motor 2.For finish vehicle quicken with and subsequent travel, vehicle ECU22 obtains the driving torque that must be passed to driving wheel 16.Then, vehicle ECU22 is according to the gear that uses in the speed changer 8 or the running state of vehicle, this driving torque suitably is assigned as the output torque of motor 2 and the output torque of motor/generator 6, and sends indication to Engine ECU 24 or inverter ECU26.At this moment, vehicle ECU22 controls speed changer 8 or clutch 4 as required.

Engine ECU 24 and inverter ECU26 receive the output torque that vehicle ECU22 sets, thereby control motor 2 and motor/generator 6 respectively.Its result, under the situation that clutch 4 engages, the output torque of motor 2 and motor/generator 6 is passed to driving wheel 16 by speed changer 8, thus vehicle driving.On the other hand, under the situation that clutch 4 disconnects, the output torque that motor/generator 6 produces is passed to driving wheel 16 by speed changer 8, thus vehicle driving.

In addition, this moment, vehicle ECU22 was according to the depression amount of utilizing accel sensor 32 detected accelerator pedals 30 or utilize the running state of vehicle such as vehicle speed sensor 34 detected travelling speeds, and the gear of speed changer 8 is suitably carried out switching controls.And, cooperate with the switching gear, in order suitably to control the moment of torsion of motor 2 or motor/generator 6, vehicle ECU22 indicates Engine ECU 24 and inverter ECU26, simultaneously control cut-out/engaging clutch 4.

And,, determine that the Maximum Torque that motor/generator 6 can be exported continuously promptly goes up limited torque according to the specification of motor/generator 6.From motor/generator 6 output torques the time, vehicle ECU22 control motor/generator 6 makes its output torque be no more than limited torque on this.

But, under the situation that the SOC of storage battery 18 extremely reduces for a certain reason, perhaps situation about declining to a great extent in the temperature of local storage battery 18 of cold or motor/generator 6 is inferior, may obtain reach the output torque of limited torque from motor/generator 6.In addition, under the situation that the excessive temperature of storage battery 18 or motor/generator 6 or inverter 20 rises, the export-restriction of motor/generator 6 is the torque limiting littler than last limited torque in order to protect above-mentioned part.

In order also to transmit essential driving force to driving wheel 16 in this case, vehicle ECU22 switches the speed change corresponding diagram of using use when the gear control of carrying out speed changer 8 according to the running state of vehicle.

In addition, vehicle ECU22 monitors whether produce fault in the motor/generator output system based on the information that sends from inverter ECU26 and storage battery ECU28.As the fault of motor/generator output system, may be the fault of the inverter circuit (not shown) that in inverter 20, uses, perhaps the fault of battery unit etc. in the storage battery 18.Take place in the motor/generator output system under the situation of this fault, vehicle ECU22 indication inverter ECU26 disconnects the electrical connection between storage battery 18 and the inverter 20.Inverter ECU26 is according to this indication control inverter 20, thus the electrical connection between disconnection storage battery 18 and the inverter 20.

Like this, by disconnecting the electrical connection between storage battery 18 and the inverter 20, motor/generator 6 is not worked as in motor and the generator any one.Therefore, when clutch 4 engaged, it rotated with motor 2 jointly by means of the driving force of motor 2.

Because motor/generator 6 is not worked, and the driving force from the motor/generator output system can not be passed to driving wheel 16.Even in order also to transmit essential driving force in this case to driving wheel 16, vehicle ECU22 is according to whether having fault in the motor/generator output system, the speed change corresponding diagram of using when switching is carried out the gear control of speed changer 8 corresponding to the running state of vehicle.

Like this, can vehicle ECU22 not only can be according to the output torque that obtain to reach limited torque from motor/generator 6, also can be according to whether there being failover speed change corresponding diagram in the motor/generator output system.

Like this, the switching controls of the speed change corresponding diagram of being undertaken by vehicle ECU22 is carried out according to as shown in Figure 2 the flow chart control cycle with regulation.

If switching controls begins, judge in step S1 then whether motor/generator 6 is difficult to limited torque (export-restriction detection unit) in the output.

Vehicle ECU22, as mentioned above based on the information that sends from storage battery ECU28, under the situation that the SOC that detects storage battery 18 extremely reduces, perhaps detect under the situation that the temperature of storage battery 18 declines to a great extent, the output torque of motor/generator 6 is restricted to the torque limiting littler than last limited torque corresponding to various situations.In addition, except above-mentioned situation, based on the information that sends from storage battery ECU28 and inverter ECU26, detect under the situation that the excessive temperature of storage battery 18 or motor/generator 6 or inverter 20 rises, vehicle ECU22 also is restricted to the torque limiting littler than last limited torque according to various situations with the output torque of motor/generator 6.In step S1, when vehicle ECU22 in the motor/generator output system situation of this restriction output torque takes place, be judged as motor/generator 6 and be difficult to export limited torque then.

Being judged as motor/generator 6 in step S1 can export under the situation of limited torque, vehicle ECU22 enters step S2 and handles, based on information, judge whether break down in the motor/generator output system (fault detection unit) from inverter ECU26 and storage battery ECU28.

Be judged as in step S2 in the motor/generator output system and do not break down, promptly under the normal situation of motor/generator output system, vehicle ECU22 enters step S3 and handles.Vehicle ECU22 selects to upgrade with speed change corresponding diagram SU1 and lowers category with speed change corresponding diagram SD1 in step S3, and finishes this control cycle.

On the other hand, be judged as motor/generator 6 and be difficult to export under the situation of limited torque in step S1, perhaps be judged as in step S2 under the situation that produces fault in the motor/generator output system, vehicle ECU22 enters step S4 and handles.Vehicle ECU22 selects to upgrade with speed change corresponding diagram SU2 and lowers category with speed change corresponding diagram SD2 in step S4, and finishes this control cycle.

In the control cycle below, vehicle ECU22 carries out switching controls from step S1 once more, selects the speed change corresponding diagram at step S3 or step S4 as mentioned above.

By in each control cycle, carrying out switching controls so repeatedly, whether be difficult to export limited torque according to motor/generator 6, and whether break down in the motor/generator output system, vehicle ECU22 selects suitable upgrading with the speed change corresponding diagram and lower category to use the speed change corresponding diagram.That is, can export limited torque being judged as motor/generator 6, under the normal situation of motor/generator output system, select to upgrade simultaneously with the speed change corresponding diagram SU1 and the usefulness speed change corresponding diagram SD1 that lowers category.On the other hand, on motor/generator 6 is difficult to export, under the situation of limited torque, perhaps under the situation about in the motor/generator output system, breaking down, selects to upgrade with speed change corresponding diagram SU2 and lower category and use speed change corresponding diagram SD2.

These speed change corresponding diagram, wherein any one are all according to by the depression amount of accel sensor 32 detected accelerator pedals 30 with by vehicle speed sensor 34 detected travelling speeds, use when carrying out the upgrading and lower category of gear of speed changer 8.

Fig. 3 is upgrading with speed change corresponding diagram SU1 in these speed change corresponding diagram.As shown in Figure 3, in speed change corresponding diagram SU1 corresponding to the depression amount and the travelling speed of accelerator pedal 30, set from 2 grades and upgrade to 3 grades the line that upgrades (2 → 3), upgrading from 3 grades upgrades to 5 grades the line that upgrades (4 → 5) to 4 grades the line that upgrades (3 → 4) and from 4 grades.

Therefore, variation according to travel condition of vehicle, if the point of being determined by the depression amount of accelerator pedal 30 and travelling speed upgrades to 3 grades the line that upgrades to right-hand crossing from 2 grades from the left of figure, then vehicle ECU 22 upgrades the gear of speed changer 8 to 3 grades from 2 grades.In addition, for upgrading to 4 grades the line and upgrade to 5 grades the line that upgrades from 4 grades of upgrading from 3 grades, also with upgrade from 2 grades identical to 3 grades the line that upgrades.That is, the point of being determined by the depression amount of accelerator pedal 30 and travelling speed crosses when respectively upgrading line to right-hand from the left of figure, upgrades accordingly respectively.

And, owing to use the output torque of motor/generator 6 simultaneously, therefore this upgrade with speed change corresponding diagram SU1 with only use the speed change corresponding diagram of the automatic transmission of using in the vehicle of motor as driving source to compare not carrying motor/generator, it is set in advance and upgrades.Its result uses motor 2 and motor/generator 6 at the same time and under the situation of powered vehicle, can improve the fuel economy of motor 2 when obtaining the necessary driving force of vehicle traction.

In addition, as shown in Figure 3, limited torque on motor/generator 6 can be exported, under the normal situation of motor/generator output system, minimum gear is 2 grades simultaneously, vehicle ECU22 is made as 2 grades with gear during vehicle start, begins to make vehicle start.Therefore, 2 grades of gears are equivalent to the 2nd gear of the present invention in the present embodiment.

Relative therewith, Fig. 4 upgrades with speed change corresponding diagram SU2.In speed change corresponding diagram SU2 corresponding to the depression amount and the travelling speed of accelerator pedal 30, set upgrading to 2 grades the line that upgrades (1 → 2) shown in solid line among Fig. 4 from 1 grade, upgrade to 3 grades the line that upgrades (2 → 3) from 2 grades, upgrading from 3 grades upgrades to 5 grades the line that upgrades (4 → 5) to 4 grades the line that upgrades (3 → 4) and from 4 grades.

Under the situation of using this speed change corresponding diagram, similarly upgrade with situation about upgrading with speed change corresponding diagram SU1.But, in upgrading, set upgrading to 2 grades the line that upgrades of in upgrading, not having as shown in Figure 4 from 1 grade with speed change corresponding diagram SU1 with speed change corresponding diagram SU2.Promptly, on motor/generator 6 is difficult to export under the situation of limited torque, perhaps under the situation about breaking down in the motor/generator output system, minimum gear becomes 1 grade, and vehicle ECU22 is made as gear the starting of 1 grade of beginning vehicle when vehicle start.Therefore, 1 grade of gear is equivalent to the 1st gear of the present invention in the present embodiment.

In addition, in Fig. 4, be represented by dotted lines the line that respectively upgrades that upgrades with speed change corresponding diagram SU1.Compare with the line that upgrades of these speed change corresponding diagram SU1 as shown in Figure 4, the correspondence with speed change corresponding diagram SU2 of the upgrading any depression amount that all is set at for identical accelerator pedal 30 in the line that upgrades upgrades in high-speed side more.That is, under use upgrades situation with speed change corresponding diagram SU2, upgrade with use and to compare with the situation of speed change corresponding diagram SU1, delay is carried out upgrading accordingly with the variation of travel condition of vehicle.

Fig. 5 is a limited torque on motor/generator 6 can be exported, and that selects under the normal situation of motor/generator output system simultaneously lowers category with speed change corresponding diagram SD1.As shown in Figure 5, in speed change corresponding diagram SD1 corresponding to the depression amount and the travelling speed of accelerator pedal 30, setting lowers category to 4 grades the line that lowers category (4 ← 5) from 5 grades, and lowering category from 4 grades lowers category to 2 grades the line that lowers category (2 ← 3) to 3 grades the line that lowers category (3 ← 4) and from 3 grades.

Therefore, according to the variation of travel condition of vehicle, if the point of being determined by the depression amount of accelerator pedal 30 and travelling speed crosses from 5 grades from the right left of figure and to lower category to 4 grades the line that lowers category, vehicle ECU22 lowers category the gear of speed changer 8 to 4 grades from 5 grades.In addition, for lowering category to 3 grades the line and lower category to 2 grades the line that lowers category from 3 grades of lowering category from 4 grades, also with lower category from 5 grades identical to 4 grades the line that lowers category.That is, the point of being determined by the depression amount of accelerator pedal 30 and travelling speed crosses when respectively lowering category line from the right left of figure, lowers category accordingly respectively.

In addition, limited torque on motor/generator 6 can be exported under the normal situation of motor/generator output system, only lowers category to 2 grades simultaneously as shown in Figure 5.Therefore, when next vehicle start, vehicle ECU22 is made as gear the starting of 2 grades of beginning vehicles as previously mentioned.

Relative therewith, Fig. 6 is under the situation of limited torque on motor/generator 6 is difficult to export, and that perhaps selects under the situation about breaking down in the motor/generator output system lowers category with speed change corresponding diagram SD2.In speed change corresponding diagram SD2, depression amount and travelling speed corresponding to accelerator pedal 30, set as among Fig. 6 with lowering category to 4 grades the line that lowers category (4 ← 5) that solid line is represented from 5 grades, lower category to 3 grades the line that lowers category (3 ← 4) from 4 grades, lowering category from 3 grades lowers category to 1 grade the line that lowers category (1 ← 2) to 2 grades the line that lowers category (2 ← 3) and from 2 grades.

Under the situation of using this corresponding diagram, similarly lower category with situation about lowering category with speed change corresponding diagram SD1.But, as shown in Figure 6 in lowering category, set and lowered category with lowering category to 1 grade the line that lowers category of not having among the speed change corresponding diagram SD1 from 2 grades with speed change corresponding diagram SD2.Therefore, on being difficult to export, motor/generator 6 under the situation of limited torque, perhaps under the situation about in the motor/generator output system, breaking down, can lower category to 1 grade.When next vehicle start, vehicle ECU22 is made as 1 grade of beginning vehicle start with gear as previously mentioned.

In addition, in Fig. 6, be represented by dotted lines the line that respectively lowers category that lowers category with speed change corresponding diagram SD1.Compare with the line that lowers category of these speed change corresponding diagram SD1, the correspondence with speed change corresponding diagram SD2 of the lowering category any depression amount that all is set at for identical accelerator pedal 30 in the line that lowers category lowers category in high-speed side more.That is, under use lowers category situation with speed change corresponding diagram SD2, lower category with use and to compare, carry out in advance lowering category accordingly with the variation of travel condition of vehicle with the situation of speed change corresponding diagram SD1.

By selecting to use each speed change corresponding diagram of setting like this, driving force will be passed to driving wheel 16 in such a way.

Limited torque on motor/generator 6 can be exported, the motor/generator output system is normal simultaneously, thereby the switching controls by the speed change corresponding diagram is selected to upgrade under the situation with the speed change corresponding diagram SU1 and the usefulness speed change corresponding diagram SD1 that lowers category, if the driver carries out the driveaway operation of vehicle as described above, vehicle ECU22 cut-off clutch 4 then is made as 2 grades according to the speed change corresponding diagram of selecting with the gear of speed changer 8 simultaneously.Then, the driving torque that must be passed to driving wheel 16 that vehicle ECU22 basis is set corresponding to the depression amount of accelerator pedal 30, the output torque of motor/generator 6 when the setting gear is 2 grades.According to the driving torque of the motor/generator of setting 6, inverter ECU26 control inverter 20, the driving force of motor/generator 6 is passed to driving wheel 16 by speed changer 8.Its result, vehicle start.

Like this, limited torque on motor/generator 6 can be exported, under the normal situation of motor/generator output system, vehicle ECU22 is made as 2 grades with the gear of speed changer 8, utilizes motor/generator 6 to make vehicle start simultaneously.Thus, can make vehicle start reposefully.

If vehicle start also quickens, the rotating speed of motor/generator 6 rises near the idling speed of motor 2, then can the driving force of motor 2 be passed to driving wheel 16 by engaging clutch 4.And in order to realize that vehicle quickens and travelling thereafter, vehicle ECU22 determines the driving torque that must transmit to driving wheel 16.Then, vehicle ECU22 is according to this driving torque, try to achieve corresponding to the gear that uses in the speed changer 8, must be from the moment of torsion that requires of motor 2 and motor/generator 6 outputs, require moment of torsion suitably to be dispensed to motor 2 sides and motor/generator 6 sides this according to the running state of vehicle.

When vehicle ECU22 will require torque distribution to motor 2 and motor/generator 6, at first determine the output torque of motor 2 according to the rotating speed of motor 2, output torque at motor 2 requires its insufficient section to be set at the output torque of motor/generator 6 under the situation of moment of torsion deficiency relatively.At this moment, consider the discharge characteristic of motor 2, the output torque of motor 2 be limited in the moment of torsion zone of the allowable torque that is less than or equal to regulation that the discharge amount that this moment of torsion zone is in lower engine speed region and NOx is little.Therefore, vehicle ECU22 control motor 2 and motor/generator 6 make requiring moment of torsion to surpass before the allowable torque, only utilize motor 2 to obtain to require moment of torsion.If require moment of torsion to surpass allowable torque, then vehicle ECU22 control motor 2 and motor/generator 6 make motor 2 output allowable torque, and insufficient section is by motor/generator 6 outputs simultaneously.

Like this, when vehicle driving, vehicle ECU22 uses speed change corresponding diagram SD1 based on upgrading with speed change corresponding diagram SU1 and lowering category of selecting, corresponding to the variation of the depression amount or the vehicle speed sensor 34 detected travelling speeds of accel sensor 32 detected accelerator pedals 30, the gear of speed changer 8 is upgraded or lowers category.At this moment, vehicle ECU22 solenoidoperated cluthes 4 as required.

Promptly, if depression amount and the definite point of travelling speed by accelerator pedal 30, cross upgrading as shown in Figure 3 as described above with the line that upgrades of speed change corresponding diagram SU1, then the gear of speed changer 8 upgrades, if cross lowering category with the line that lowers category of speed change corresponding diagram SD1 as shown in Figure 5, then the gear of speed changer 8 lowers category.

Therefore, under the situation of vehicle start and acceleration, follow the raising of travelling speed, the gear of speed changer 8 upgrades in proper order.At this moment and since as described above when vehicle start gear be 2 grades, with when starting gear be that 1 grade situation is compared, upgrade to 5 grades the number of times that upgrades and reduce, can quicken reposefully.

On the other hand, be difficult to limited torque in the output at motor/generator 6, perhaps break down in the motor/generator output system, selected to upgrade with under speed change corresponding diagram SU2 and the situation of lowering category by the switching controls of speed change corresponding diagram with speed change corresponding diagram SD2, if the driver carries out vehicle start as described above, vehicle ECU22 cut-off clutch 4 then is made as 1 grade according to the speed change corresponding diagram of selecting with the gear of speed changer 8 simultaneously.

Under the situation about breaking down in the situation of limited torque and the motor/generator output system on motor/engine 6 is difficult to export, vehicle ECU22 uses diverse ways control motor 2 and motor/generator 6.

Under the situation of limited torque, vehicle ECU22 sets the driving torque of motor/generator 6 according to the driving torque of setting corresponding to the depression amount of accelerator pedal 30 that must be passed to driving wheel 16 on motor/generator 6 is difficult to export.At this moment, because motor/generator 6 is in the state that can not make output torque reach limited torque, according to the judgement among Fig. 2 step S1, motor/generator 6 is difficult to export limited torque, so the output torque of motor/generator 6 is restricted to is less than or equal to torque limiting, and this torque limiting is less than last limited torque.

And because the gear that use in the speed changer 8 this moment is 1 grade, therefore the driving torque that equates in order to be 2 grades with gear the time is passed to driving wheel 16, and the output torque of motor/generator 6 is little in the time of can being 2 grades than gear.Therefore, be less than or equal to the torque limiting littler, also can transmit the necessary driving force of vehicle starts to driving wheel 16 than last limited torque even the output torque of motor/generator 6 is restricted to.Its result, the reduction of cornering ability that the driving force deficiency causes in the time of can preventing by vehicle start and driving sensation.

Then, according to the driving torque of the motor/generator 6 of such setting, by inverter ECU26 control inverter 20, the driving force of motor/generator 6 is passed to driving wheel 16 by speed changer 8, thus vehicle start.

, the driving force of motor 2 can be passed to driving wheel 16 by engaging clutch 4 if thereby the rotating speed of vehicle start and acceleration motor/generator 6 rises near the idling speed of motor 2.Vehicle ECU22 determines to be passed to the driving torque of driving wheel 16 as described above.And vehicle ECU22 obtains according to this driving torque must be from the moment of torsion that requires of motor 2 and motor/engine 6 outputs, and suitably is dispensed to motor 2 sides and motor/generator 6 sides.

In addition, vehicle ECU22 uses speed change corresponding diagram SD2 based on upgrading with speed change corresponding diagram SU2 and lowering category of selecting, according to the variation of the depression amount or the vehicle speed sensor 34 detected travelling speeds of accel sensor 32 detected accelerator pedals 30, the gear of speed changer 8 is upgraded or lowers category.And vehicle ECU22 is solenoidoperated cluthes 4 as required.

Promptly, if depression amount and the definite point of travelling speed by accelerator pedal 30, cross the line that upgrades that upgrades as shown in Figure 4 with speed change corresponding diagram SU2 as described above, then the gear of speed changer 8 upgrades, if cross lowering category with the line that lowers category of speed change corresponding diagram SD2 as shown in Figure 6, then the gear of speed changer 8 lowers category.

At this moment, upgrade and compare with speed change corresponding diagram SD1 with lowering category with speed change corresponding diagram SU1 with upgrading with speed change corresponding diagram SD2 with lowering category with speed change corresponding diagram SU2, the variation with respect to the depression amount and the travelling speed of accelerator pedal 30 postpones to upgrade, and lowers category in advance simultaneously.Therefore, motor 2 and motor/generator 6 are using than high rotational speed side.Its result, according to the driving torque that must be passed to driving wheel 16 for vehicle driving, the motor of obtaining corresponding to the use gear 2 and the output torque summation of motor/generator 6 can be exported the output torque summation under the situation of limited torque less than motor/generator 6.

Therefore, be less than or equal to the torque limiting littler, also can transmit the necessary driving force of vehicle driving to driving wheel 16 than last limited torque even as described above the output torque of motor/generator 6 is restricted to.Therefore, can prevent because cornering ability that the driving force deficiency causes or driving sensation descend.

In addition, when vehicle ECU22 will require torque distribution to motor 2 and motor/generator 6, the situation that can export limited torque with motor/generator 6 was identical, and vehicle ECU22 at first determines the output torque of motor 2 according to the rotating speed of motor 2.Output torque at motor 2 is not enough to reach under the situation of requirement moment of torsion, and vehicle ECU22 is made as its insufficient section the output torque of motor/generator 6.

Like this, near the rotating speed of motor/generator 6 rose to the idling speed of motor 2, during engaging clutch 4 back distribute torque, vehicle ECU22 used control corresponding diagram as shown in Figure 7.This control corresponding diagram as shown in Figure 7, according to the rotating speed of motor/generator 6 with require moment of torsion, the output area of regulation motor 2 and motor/generator 6 moments of torsion.That is, in this control corresponding diagram, require the zone of the CLV ceiling limit value Tmax below of moment of torsion to be split into and only utilize motor 2 to obtain to require the output area R1 of moment of torsion and utilize motor 2 and motor/generator 6 both acquisitions to require the output area R2 of moment of torsion.And because clutch 4 engages at this moment, so the rotating speed of motor/generator 6 is identical with the rotating speed of motor 2.

The Maximum Torque Te that the separatrix of output area R1 and R2 can be exported under this rotating speed corresponding to motor 2.Therefore, vehicle ECU22 control motor 2 and motor/generator 6 make requiring moment of torsion to surpass before the max. output torque of motor 2, only utilize motor 2 to obtain to require moment of torsion.If require moment of torsion to surpass the max. output torque of motor 2, vehicle ECU22 control motor 2 and motor/generator 6 make motor 2 outputs Maximum Torque at this moment, and insufficient section is by motor/generator 6 outputs simultaneously.

On motor/generator 6 can be exported, under the situation of limited torque, consider the discharge characteristic of motor 2 as described above, the output torque of motor 2 is restricted to is less than or equal to allowable torque.In Fig. 7, represent this allowable torque with dot and dash line.

As shown in Figure 7, on motor/engine 6 can be exported under the situation of limited torque, the output torque of motor 2 is restricted to is less than or equal to allowable torque, relative therewith, on being difficult to export, motor/generator 6 under the situation of limited torque, allows that the output torque of motor 2 reaches Maximum Torque Te.Like this, on being difficult to export, motor/generator 6 under the situation of limited torque, dwindles the zone of the output torque that needs motor/generator 6 at low speed side.

By such setting output area, under the situation of limited torque, vehicle ECU 22 alleviates the burden of motor/generator 6 as best one can on motor/generator 6 is difficult to export.Particularly under the situation that causes the output of motor/generator 6 to be restricted owing to the SOC reduction, can suppress the further reduction of SOC, can realize that SOC restores as early as possible simultaneously.

In addition, on being difficult to export, motor/generator 6 under the situation of limited torque, by selecting to upgrade with speed change corresponding diagram SU2 and lowering category, motor 2 and motor/generator 6 are moved in high rotating speed side as described above with speed change corresponding diagram SD2.On this basis, move to low speed side simultaneously, export-restriction is further reduced the influence that motor/generator 6 produces as above-mentioned dwindling by output area with motor/generator 6.

Therefore, even under the significantly limited situation of the output of motor/generator 6, also can prevent the not enough such situation of driving force reliably.

On the other hand, in the motor/generator output system, detect under the situation of fault, as mentioned above, select to upgrade with the speed change corresponding diagram SU2 and the usefulness speed change corresponding diagram SD2 that lowers category by the switching controls of speed change corresponding diagram.In this case, if the driver carries out the driveaway operation of vehicle as described above, vehicle ECU22 cut-off clutch 4 is made as 1 grade according to the speed change corresponding diagram of selecting with the gear of speed changer 8 simultaneously.

In addition, this moment, for the moment of torsion of exporting corresponding to accelerator pedal 30 depression amount from motor 2, vehicle ECU22 indicated Engine ECU 24, simultaneously half engaging clutch 4 because motor/generator 6 is not worked.Engine ECU 24 receives the indication control motor 2 from vehicle ECU22, makes its output and the depression amount of accel sensor 32 detected accelerator pedals 30 and the corresponding moment of torsion of rotating speed of motor 2.The driving torque of motor 2 is passed to driving wheel 16 by the clutch 4 and the speed changer 8 of half jointing state, thus vehicle start.

Though driving force can't be passed to driving wheel 16 from motor/generator 6, but because the gear that use in the speed changer 8 this moment is 1 grade, therefore can transmit the necessary driving force of vehicle start to driving wheel 16, cornering ability that the driving force deficiency causes in the time of can suppressing owing to vehicle start and the decline of driving sensation.

If thereby the rotating speed of vehicle start and acceleration motor/generator 6 rises near the idling speed of motor 2, the complete engaging clutch 4 of vehicle ECU22 then, and, determine the driving torque that must transmit to driving wheel 16 in order to realize that vehicle quickens and travelling thereafter.Then, obtaining corresponding to the gear that uses in the speed changer 8 according to this driving torque must be from the moment of torsion that requires of motor 2 outputs, and indication Engine ECU 24 makes motor 2 outputs, and this requires moment of torsion.

In addition, vehicle ECU22 uses speed change corresponding diagram SD2 based on upgrading with speed change corresponding diagram SU2 and lowering category of selecting, corresponding to the variation of the depression amount or the vehicle speed sensor 34 detected travelling speeds of accel sensor 32 detected accelerator pedals 30, the gear of speed changer 8 is upgraded or lowers category.At this moment, vehicle ECU22 solenoidoperated cluthes 4 as required.

Promptly, if depression amount and the definite point of travelling speed by accelerator pedal 30, cross upgrading as shown in Figure 4 as described above with the line that upgrades of speed change corresponding diagram SU2, then the gear of speed changer 8 upgrades, if cross lowering category with the line that lowers category of speed change corresponding diagram SD2 as shown in Figure 6, then the gear of speed changer 8 lowers category.

As previously mentioned, upgrade and compare with speed change corresponding diagram SD1 with lowering category with speed change corresponding diagram SU1 with upgrading with speed change corresponding diagram SD2 with lowering category with speed change corresponding diagram SU2, the depression amount of its relative accelerator pedal 30 and the variation of travelling speed postpone to upgrade, and lower category in advance simultaneously.Therefore, even can not obtain driving force, and, also can guarantee to quicken necessary driving force only by the drive force driving wheel of motor 2 from motor/generator 6.Its result can suppress because the reduction of cornering ability that the driving force deficiency causes or driving sensation.

Vehicle ECU22, except carrying out speed change corresponding diagram switching controls as above, when cancellation depress throttle pedal 30 back vehicle decelerations travelled, whether also according to breaking down in the motor/generator output system, the control of carrying out clutch 4 was switched.

That is, for motor vehicle driven by mixed power 1, can be when vehicle deceleration such as the above-mentioned regenerative braking power of motor/generator 6 of utilizing suitably carry out vehicle deceleration.But, under the situation about in the motor/generator output system, breaking down, can not utilize such regenerative braking power.Therefore, vehicle ECU22 switches by the control of clutch 4, even under the situation about breaking down in the motor/generator output system, also can suitably carry out vehicle deceleration.

The switching controls of utilizing the Clutch Control that this vehicle ECU22 carries out is carried out according to as shown in Figure 8 the flow chart control cycle with regulation.

If the switching controls of Clutch Control begins, then identical with the processing of step S2 of speed change corresponding diagram switching controls among Fig. 2, vehicle ECU22 based on the information from inverter ECU26 and storage battery ECU28, judges whether break down in the motor/generator output system (fault detection unit) at step S11.

Be judged as in step S11 in the motor/generator output system and do not break down, promptly under the normal situation of motor/generator output system, vehicle ECU22 enters step S12 and handles, and behind the selection Clutch Control A, finishes this control cycle.On the other hand, be judged as in step S11 under the situation about breaking down in the motor/generator output system, vehicle ECU22 enters step S13 and handles, and behind the selection Clutch Control B, finishes this control cycle.

Vehicle ECU22 is by carrying out like this judgement of step S11 repeatedly at each control cycle, corresponding to whether breaking down in the motor/generator output system, thereby select Clutch Control A or Clutch Control B.

Vehicle ECU22 in order to cooperate the Clutch Control of such selection, controls motor 2 and motor/generator 6 in the following manner when vehicle deceleration travels.

Under the normal situation of motor/generator output system, if cancellation depress throttle pedal 30, vehicle ECU22 is then based on the gear that uses in rotating speed by speed probe 36 detected motor/generators 6 and the speed changer 8, will be set at and require deceleration torque in order suitably to carry out the necessary deceleration torque of vehicle deceleration.

Shown in solid line among Fig. 9, each gear of corresponding speed changer 8 is set this respectively and is required deceleration torque.The rotating speed that requires deceleration torque to have to follow motor/generator 6 of corresponding each gear rises and the characteristic that increases.In addition, as shown in Figure 9, be in the gear of high-speed side more, then require deceleration torque to set greatly more.

In addition, the CLV ceiling limit value that vehicle ECU22 will the regenerative braking moment of torsion that motor/generator 6 can produce under by the rotating speed of speed probe 36 detected motor/generators 6 is set at upper limit deceleration torque.This upper limit deceleration torque is according to the specification of motor/generator 6, the rotating speed of respective motor/generator 6 and determining.Upper limit deceleration torque has certain fixed value in low rotation speed area shown in dot and dash line among Fig. 9, on the other hand, have the rotating speed increase of following motor/generator 6 and the characteristic that reduces in high rotating speed side.In addition, as shown in Figure 9, with respect to and the magnitude relationship that require deceleration torque that set corresponding with each gear of 2 grades to 5 grades, the magnitude relationship of upper limit deceleration torque N2 to N5 under each rotating speed reverses.

With respect to such upper limit deceleration torque, require under the big situation of deceleration torque, only the regenerative braking moment of torsion by motor/generator 6 can not obtain to require deceleration torque.Therefore, vehicle ECU22 engaging clutch 4, and control motor 2 and motor/generator 6, thereby by comprehensively obtaining to require deceleration torque from the deceleration torque of motor 2 with by the deceleration torque that the regenerative braking of motor/generator 6 produces.

In addition, requiring deceleration torque to be less than or equal under the situation of upper limit deceleration torque, only the regenerative braking moment of torsion by motor/generator 6 can obtain to require deceleration torque.Therefore, vehicle ECU22 cut-off clutch 4, thereby and control motor/generator 6 only the regenerative braking by motor/generator 6 obtain to require deceleration torque.

Vehicle ECU22 is by carrying out above-mentioned control, utilizes the regenerative braking of motor/generator 6 to reclaim energy when slowing down as much as possible.Therefore, for the Clutch Control A that selects under the normal situation of motor/generator output system, vehicle ECU22 is the joint/off state of the magnitude relationship solenoidoperated cluthes 4 of deceleration torque and upper limit deceleration torque as requested.

On the other hand, in the motor/generator output system, detect under the situation of fault, can not obtain regenerative braking power by motor/generator 6.Therefore, if cancellation depress throttle pedal 30, then vehicle ECU22 makes clutch 4 be in jointing state.And vehicle ECU22 indication Engine ECU 24 is carried out the decelerate of motor 2, i.e. indication stops to motor 2 fuelings and be provided with under the situation of exhaust brake making exhaust brake work etc.

Engine ECU 24 is according to the indication from vehicle ECU22, by stopping fuel supply or making exhaust brake work under the situation of exhaust brake having, makes motor 2 decelerates.

Its result is passed to driving wheel 16 through clutch 4 from speed changer 8 by the deceleration torque with motor 2 and makes vehicle deceleration.At this moment, by speed probe 36 detected rotating speeds, because clutch 4 joints, thereby identical with the rotating speed of motor 2.Escort vehicle slows down, travelling speed reduces, and based on by speed probe 36 detected rotating speeds, learns that the speed drop of motor 2 is low to moderate near the idling speed if vehicle ECU22 detects, then for the rotating speed that makes motor 2 is not less than idling speed, vehicle ECU22 cut-off clutch 4.

Like this, for detecting the Clutch Control B that selects under the situation of fault in the motor/generator output system, before the speed drop of motor 2 was low to moderate near the idling speed, often engaging clutch 4, utilize the deceleration torque of motor 2 to make vehicle deceleration.

Its result, can not utilize even in the motor/generator output system, break down under the situation of regenerative braking power of motor/generator 6, also can the suitable necessary deceleration torque that slows down of vehicle be passed to driving wheel 16 constantly by being used lowering category of lowering category in advance as the aforementioned with speed change corresponding diagram SD2.Its result can make vehicle slow down well.

More than the control system device of the related motor vehicle driven by mixed power of an embodiment of the invention is illustrated, but the present invention is not limited to above-mentioned mode of execution.

For example, in the above-described embodiment, detect under the situation of fault in limited torque and the motor/generator output system on motor/generator 6 is difficult to export, vehicle ECU22 selects to upgrade with speed change corresponding diagram SU2 and lowers category and uses speed change corresponding diagram SD2 under any one situation therein.But, owing in the motor/generator output system, detect under the situation of fault, have only the driving torque of motor 2 can be passed to driving wheel 16, therefore compare with the situation that motor/generator 6 is difficult to export limited torque, also can select more early to lower category the slower speed change corresponding diagram that upgrades of while.By this practice, can guarantee to quicken necessary driving force better.Its result can suppress cornering ability that is caused by the driving force deficiency and the reduction of driving sensation reliably.

In addition, in the above-described embodiment, on motor/generator 6 is difficult to export under the situation of limited torque or detect in the motor/generator output system under the situation of fault, gear by with vehicle start the time is made as 1 grade, and under the normal situation of motor/generator output system, because motor/generator 6 can be exported limited torque, the gear during therefore with vehicle start is made as 2 grades.But the gear under different situations during vehicle start is not limited thereto, the gear in the time of also can setting vehicle start according to the specification of vehicle.In this case, can export limited torque with motor/generator 6, gear under the normal situation of motor/generator output system is compared, can make at motor/generator 6 to be difficult to limited torque in the output, the gear that perhaps detects in the motor/generator output system under the situation of fault is positioned at more low speed side.

In addition, in the above-described embodiment, the output torque of motor/generator 6 by physical constraints be less than or equal to than on during the little torque limiting of limited torque, then vehicle ECU22 is judged as motor/generator 6 and is difficult to export limited torque.But vehicle ECU22 also can be based on the information from storage battery ECU28, when the SOC of storage battery 18 is lower than the lower limit SOC (for example 30%) of regulation, is judged as motor/generator 6 and is difficult to export limited torque.In this case, the big slightly SOC of SOC by will can not actual output than motor/generator 6 go up limited torque the time is set at lower limit SOC, thereby the speed change corresponding diagram is switched in the actual reduction that can predict motor/generator 6 outputs.Its result can prevent to follow the speed change corresponding diagram to switch the temporary driving force deficiency that produces late.

Perhaps, vehicle ECU22 also can be based on the information from storage battery ECU28, when the electric power upper limit that can export at this moment storage battery 18 allows that promptly output value is lower than regulation output, is judged as motor/generator 6 and is difficult to export limited torque.In this case, can predict the actual reduction of motor/generator 6 outputs, thereby switch the speed change corresponding diagram.Its result can prevent the temporary driving force deficiency of following speed change corresponding diagram switching delay to produce.

In addition, in the above-described embodiment, motor/generator 6 is configured between clutch 4 and the speed changer 8, but the configuration of motor/generator 6 is not limited thereto.Even for example between motor 2 and clutch 4, dispose the motor vehicle driven by mixed power of motor/generator 6 etc., so long as can be respectively the driving force of the driving force of motor 2 and motor/generator 6 be passed to the motor vehicle driven by mixed power of driving wheel 16, just can obtain same effect.

In addition, speed changer 8 is that forward gear is 5 grades a automatic transmission in the above-described embodiment.But the quantity of gear and the type of automatic transmission are not limited thereto, and for example use stepless speed variator also passable.

In addition, use by speed probe 36 detected motor/generator 6 rotating speeds in the above-described embodiment.But, replace aforesaid way, also can detect the output speed of speed changer 8, utilize gear ratio that it is transformed to the rotating speed of motor/generator 6.Perhaps, also can obtain the rotating speed of motor/generator 6 according to the amount that changes corresponding to motor/generator 6 rotating speeds.

And motor 2 is a diesel engine in the above-described embodiment, but the type of motor is not limited to this, also can be petrol engine.

Claims

1. the control gear of a motor vehicle driven by mixed power, they can be via the automatic transmission with a plurality of forward gear (8), to be passed to driving wheel (16) by the driving force of motor output system and the output of motor/generator output system, wherein, above-mentioned motor output system is used to export the driving force that motor (2) produces, above-mentioned motor/generator output system is used for the driving force that output motor/generator (6) produces, it possesses control unit (22), this control unit (22) is based on the speed change corresponding diagram of regulation, gear corresponding to the variation of above-mentioned travel condition of vehicle to above-mentioned automatic transmission (8) carries out switching controls, it is characterized in that

Above-mentioned control gear also possesses:

Export-restriction detection unit (S1), its be used to detect above-mentioned motor/generator (6) be difficult to export as its Maximum Torque that can export and the predetermined specified states that goes up limited torque; And

Fault detection unit (S2), it is used to detect above-mentioned motor/generator output system and fault whether occurred,

When detecting the afore mentioned rules state by above-mentioned export-restriction detection unit (S1), or when detecting the fault of above-mentioned motor/generator output system by above-mentioned fault detection unit (S2), above-mentioned control unit (22) uses following speed change corresponding diagram (SU2, SD2) control above-mentioned automatic transmission (8), this speed change corresponding diagram (SU2, SD2) with do not detecting the afore mentioned rules state by above-mentioned export-restriction detection unit (S1), and detect the just often employed speed change corresponding diagram of above-mentioned motor/generator output system (SU1 by above-mentioned fault detection unit (S2), SD1) compare, carry out in advance lowering category accordingly, postpone simultaneously to carry out to upgrade accordingly with above-mentioned travel condition of vehicle variation with above-mentioned travel condition of vehicle variation.

2. the control gear of motor vehicle driven by mixed power according to claim 1 is characterized in that,

For than above-mentioned when going up the little torque limiting of limited torque, above-mentioned export-restriction detection unit (S1) detects the afore mentioned rules state to the moment of torsion that can export at above-mentioned motor/generator (6) by physical constraints.

3. the control gear of motor vehicle driven by mixed power according to claim 1 is characterized in that,

Above-mentioned control gear also possesses charge rate detection unit (28), and it is used for detecting the charge rate to the storage battery (18) of above-mentioned motor/generator (6) supply capability,

When the charge rate by the detected above-mentioned storage battery of above-mentioned charge rate detection unit (28) (18) was lower than the lower limit charge rate of regulation, above-mentioned export-restriction detection unit (S1) detected the afore mentioned rules state.

4. the control gear of motor vehicle driven by mixed power according to claim 1 is characterized in that,

When the electric power upper limit that can export to the storage battery (18) of above-mentioned motor/generator (6) supply capability allowed that promptly output value is lower than regulation output, above-mentioned export-restriction detection unit (S1) detected the afore mentioned rules state.

5. according to the control gear of any described motor vehicle driven by mixed power in the claim 1 to 4, it is characterized in that,

Above-mentioned control unit (22) is detecting under the situation of afore mentioned rules state by above-mentioned export-restriction detection unit (S1), use is made as the gear of above-mentioned automatic transmission (8) the speed change corresponding diagram (SU2 of the 1st gear when vehicle begins to start to walk, SD2), on the other hand, do not detecting under the situation of afore mentioned rules state by above-mentioned export-restriction detection unit (S1), use is made as the gear of above-mentioned automatic transmission (8) the speed change corresponding diagram (SU1 of the 2nd gear when vehicle begins to start to walk, SD1), the 2nd gear is positioned at the high-speed side of the 1st gear.

6. the control gear of motor vehicle driven by mixed power according to claim 1 is characterized in that,

Above-mentioned control gear also possesses: clutch (4), and it can disconnect the driving force that is passed to above-mentioned automatic transmission (8) from above-mentioned motor (2); And

Rotation speed detection unit (36), it is used to detect the rotating speed of above-mentioned motor/generator (6),

When above-mentioned vehicle deceleration, do not detect under the situation of above-mentioned fault by above-mentioned fault detection unit (S2), above-mentioned control unit (22) is corresponding to the detected rotating speed of above-mentioned rotation speed detection unit (36), the regenerative braking torque setting that above-mentioned motor/generator (6) can be produced is a upper limit deceleration torque, simultaneously the necessary deceleration torque of above-mentioned vehicle deceleration is set at and requires deceleration torque, when the above-mentioned requirements deceleration torque is less than or equal to above-mentioned upper limit deceleration torque, disconnect above-mentioned clutch (4), controlling above-mentioned motor/generator (6) makes it produce the above-mentioned requirements deceleration torque, on the other hand, at the above-mentioned requirements deceleration torque during greater than above-mentioned upper limit deceleration torque, engage above-mentioned clutch (4), control above-mentioned motor (2) and above-mentioned motor/generator (6), make from the deceleration torque of above-mentioned motor (2) with from the summation of the regenerative braking moment of torsion of above-mentioned motor/generator (6) and become the above-mentioned requirements deceleration torque

And, when above-mentioned vehicle deceleration, detecting under the situation of above-mentioned fault by above-mentioned fault detection unit (S2), above-mentioned control unit (22) before the speed drop of above-mentioned motor (2) is low to moderate near the idling speed, often engages above-mentioned clutch (4) at least.