JP4376449B2 - Control device for hybrid vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control device for a hybrid vehicle that quickly raises a lowered oil temperature of a transmission.
[0002]
[Prior art]
In recent years, in vehicles such as automobiles, hybrid vehicles using both an engine and a motor have been developed from the viewpoint of low pollution and resource saving. Such hybrid vehicles include a series hybrid vehicle system in which a generator is driven by an engine to generate electricity and a motor as a driving source, or the motor assists engine power and travels while charging a battery as a generator. There is a parallel hybrid vehicle system that can be used, or a parallel series hybrid vehicle system that controls parallel operation and series operation so as to be most efficient in accordance with driving conditions.
[0003]
By the way, it is for automatic transmission at low temperature and low load like idling right after engine start. Oil etc. Because the transmission oil temperature is low and the oil viscosity is high, there is a problem that transmission loss of the power transmission device increases and fuel consumption deteriorates. For the purpose of improving the transmission efficiency of such a power transmission device, for example, Japanese Patent Application Laid-Open No. 10-131732 proposes a technique for raising the oil temperature with an electric heater or a waste heat heater using exhaust gas as a heat source.
[0004]
[Problems to be solved by the invention]
However, in the case where the above-described prior art electric heater is disposed, an additional system is required, and further, there is a problem that fuel consumption is deteriorated due to an electric load. Further, when the waste heat heater of the above prior art is provided, the heater system becomes complicated as well as an increase in weight, such as forming an exhaust gas passage for heating the lubricating oil and requiring control by an exhaust valve. On the other hand, there is a problem that the effect is small when the engine is cold.
[0005]
The present invention has been made in view of the above circumstances, and can easily heat the transmission oil by changing only the control without adding a special system for heating the transmission oil, and includes the power including the transmission. It is an object of the present invention to provide a hybrid vehicle control device that can improve fuel efficiency by reducing transmission loss of the transmission device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a hybrid vehicle control device according to the present invention as set forth in claim 1 is provided in the vicinity of an engine, a transmission for transmitting at least the driving force of the engine by increasing or decreasing by shifting, and the transmission. A motor that can freely regenerate driving force and generate driving force and that generates heat to raise the temperature of transmission oil for the transmission, and a temperature that detects the temperature of transmission oil for the transmission. Detecting means and control means for increasing the temperature of the transmission oil of the transmission by driving or regenerating by the motor when the temperature of the transmission oil of the transmission is lower than a preset temperature value. Preparation , The control means controls the driving force of the engine when the temperature of transmission oil of the transmission is lower than a preset temperature value. Decline As well as Drive the motor to generate driving force The temperature of the transmission oil of the transmission is increased, and the driving force generated in the vehicle is maintained.
[0008]
Further claims 2 The hybrid vehicle control device according to the present invention An engine, a transmission that transmits and receives at least the driving force of the engine by shifting, and a transmission that is disposed near the transmission. A motor for increasing the temperature of the transmission oil of the transmission, temperature detecting means for detecting the temperature of the transmission oil of the transmission, and a temperature value set in advance by the temperature of the transmission oil of the transmission. Control means for driving or regenerating by the motor to raise the temperature of the transmission oil of the transmission when lower than The motor includes two motors, a first motor capable of generating a driving force by driving and a second motor capable of regenerating a driving force, and the control means is a transmission of the transmission. When the oil temperature falls below a preset temperature value, the driving force of the first motor is increased, and the increased driving force is regenerated by the second motor to be used for the transmission of the transmission. The oil temperature is raised and the driving force generated in the vehicle is maintained.
[0009]
Claims 3 The hybrid vehicle control device according to the present invention An engine, a transmission that transmits and receives at least the driving force of the engine by shifting, and a transmission that is disposed near the transmission. A motor for increasing the temperature of the transmission oil of the transmission, temperature detecting means for detecting the temperature of the transmission oil of the transmission, and a temperature value set in advance by the temperature of the transmission oil of the transmission. Control means for driving or regenerating by the motor to raise the temperature of the transmission oil of the transmission when lower than The control means sets a necessary braking force by at least a friction braking force and a regenerative braking force by regeneration of the motor at the time of braking, and the control means is a transmission oil for the transmission. When the temperature is lower than a preset temperature value, the motor is driven to increase the ratio of the regenerative braking force by the motor during braking to increase the temperature of the transmission oil of the transmission, The braking force generated in the vehicle is maintained.
[0011]
That is, in the hybrid vehicle control device according to the first aspect, the control means causes the motor to generate heat when the oil temperature of the transmission falls below a preset temperature value, and this heat is disposed in the vicinity of the motor. It is transmitted to the transmission side, the oil temperature is raised, the transmission loss of the power transmission device including the speed reducer due to the oil viscosity is reduced, and the fuel efficiency is improved. In particular , Strange When the temperature of the transmission oil for the speed reducer falls below a preset temperature value, the driving force of the engine is reduced and the motor is driven to generate a driving force for driving, so that the temperature of the transmission oil for the transmission is reduced. To maintain the driving force generated in the vehicle.
[0012]
In the hybrid vehicle control device according to the second aspect, the control means causes the motor to generate heat when the oil temperature of the transmission falls below a preset temperature value, and this heat is disposed in the vicinity of the motor. It is transmitted to the transmission side, the oil temperature is raised, the transmission loss of the power transmission device including the speed reducer due to the oil viscosity is reduced, and the fuel efficiency is improved. In particular , Strange When the temperature of the transmission oil for the speed gear falls below a preset temperature value, the driving force of the first motor is increased, and the increased driving force is regenerated by the second motor to change the speed of the transmission. The temperature of machine oil is raised and the driving force generated in the vehicle is maintained.
[0013]
Further, in the hybrid vehicle control device according to the third aspect, the control means causes the motor to generate heat when the oil temperature of the transmission falls below a preset temperature value, and this heat is disposed in the vicinity of the motor. It is transmitted to the transmission side, the oil temperature is raised, the transmission loss of the power transmission device including the speed reducer due to the oil viscosity is reduced, and the fuel efficiency is improved. In particular , Strange When the temperature of the transmission oil for the speed reducer falls below a preset temperature value, the temperature of the transmission oil for the transmission is increased by driving the motor to increase the ratio of the regenerative braking force by the motor during braking. To maintain the braking force generated in the vehicle.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 relate to a first embodiment of the present invention, FIG. 1 is a diagram for explaining the configuration of a hybrid vehicle drive control system, FIG. 2 is a flowchart of hybrid vehicle drive control, and FIG. 3 is an engine speed and engine. FIG. 4 is a characteristic diagram showing the relationship between outputs, and FIG.
[0015]
That is, as shown in FIG. 1, the hybrid vehicle in the first embodiment is a parallel hybrid vehicle that uses an engine and two motors A and B in combination. The engine 1 and the output shaft 1a of the engine 1 A motor A (motor / generator) 2 that is directly connected to the engine 1 and is responsible for starting and generating power / power assist, and a single pinion planetary gear unit 3 connected to an output shaft 1a of the engine 1 extending from the motor A2. The function of the single-pinion planetary gear unit 3 is controlled, and a motor B (traveling motor) 4 that serves as a driving force source for starting and moving backwards and collects deceleration energy, and performs shifting and torque amplification during traveling. A drive system having a basic configuration of a continuously variable transmission 5 as a transmission having a power conversion function is provided. Since the motor A2 is directly connected to the output shaft 1a of the engine 1, even when the engine 1 is stopped, the output shaft 1a of the engine 1 is rotated by the rotation of the motor A2, and the engine 1 is used for circulating coolant (not shown). The water pump can be driven.
[0016]
The planetary gear unit 3 has a sun gear 3a, a carrier 3b that rotatably supports a pinion that meshes with the sun gear 3a, and a ring gear 3c that meshes with the pinion, and a lock for fastening and releasing the sun gear 3a and the ring gear 3c. An up clutch 6 is provided.
[0017]
The continuously variable transmission 5 is configured by winding a drive belt 5e between a primary pulley 5b pivotally supported by the input shaft 5a and a secondary pulley 5d pivotally supported by the output shaft 5c. The continuously variable transmission 5 will be described as CVT5.
[0018]
That is, in the hybrid vehicle drive system according to the first embodiment, the planetary gear unit 3 having the lockup clutch 6 interposed between the sun gear 3a and the ring gear 3c is connected to the output shaft 1a of the engine 1 and the input shaft 5a of the CVT 5. It is arranged between. The sun gear 3a of the planetary gear unit 3 is coupled to the output shaft 1a of the engine 1 via the motor A2, the carrier 3b is coupled to the input shaft 5a of the CVT 5, and the motor B4 is coupled to the ring gear 3c. A differential mechanism 8 is connected to the output shaft 5 c of the CVT 5 via a reduction gear train 7, and a front wheel or a rear wheel drive wheel 10 is connected to the differential mechanism 8 via a drive shaft 9.
[0019]
As described above, the engine 1 and the motor A2 are coupled to the sun gear 3a of the planetary gear unit 3, and the motor B4 is coupled to the ring gear 3c so as to obtain an output from the carrier 3b. Further, the output from the carrier 3b is changed by the CVT5. Since the torque is amplified and transmitted to the driving wheel 10, the two motors A2 and B4 can be used for both power generation and driving force supply, and a relatively small output motor can be used. .
[0020]
Further, the sun gear 3a and the ring gear 3c of the planetary gear unit 3 are fastened by the lock-up clutch 6 according to the driving conditions, so that the two motors A2 and B4 are disposed between the engine 1 and the CVT 5 directly connected to the engine. A drive shaft can be formed, and the drive force can be efficiently transmitted to the CVT 5 or the braking force from the drive wheel 10 side can be used.
[0021]
As apparent from the configuration of the drive system, both the motor A2 and the motor B4 are arranged in the vicinity of the continuously variable transmission 5. When the motor A2 and the motor B4 are driven to generate heat, The heat is immediately transmitted to the continuously variable transmission 5 via the single pinion planetary gear unit 3, and the continuously variable transmission 5 Transmission oil Increase the temperature.
[0022]
Next, a control system (hybrid control system) that controls the above drive system and controls the traveling of the hybrid vehicle will be described. Reference numeral 15 is a control device that includes a microcomputer and a functional circuit controlled by the microcomputer, and centrally controls the engine 1, two motors A2, B4, and CVT5.
[0023]
The control device 15 detects the driver's driving status by detecting the depression of the accelerator pedal and the brake pedal, the steering angle of the steering, etc., and detects the operating status of auxiliary equipment such as lights and air conditioners. At the same time, a switch / sensor group is connected to detect the current vehicle running state such as vehicle speed, uphill and downhill, and road surface conditions. Further, the control device 15 further includes an operating state of the engine 1, two motors A2, B4, CVT5, a main battery for the two motors A2, B4, and a 12V battery for normal auxiliary devices (both shown in FIG. (Not shown), and based on these various information, drive control of the hybrid vehicle to be described later is executed. Further, the engine 1 is controlled, the motors A2 and B4 are driven via an inverter (not shown), and each battery is controlled. Charge control, control of the gear ratio of CVT5, supply hydraulic pressure, and the like are performed. Further, the control device 15 includes various meters for displaying the driving state of the vehicle such as the vehicle speed, the engine speed, the battery charging state, and the like (not shown) including warning lamps for warning the driver when an abnormality occurs. Is connected. The control related to the engine 1 executed by the control device 15 is obtained from the switch / sensor group, such as the vehicle speed, the shift selection position, the accelerator opening data, the brake operation state, and the values obtained from the switch / sensor group. Based on the calculated value obtained by predetermined calculation, fuel injection amount from an injector (not shown), throttle opening by ETC (electric throttle valve), power correction learning of auxiliary equipment such as A / C (air conditioner), fuel This is done by controlling cutting and the like.
[0024]
The driving mode of the hybrid vehicle controlled by the above hybrid control system can be broadly divided into the following three basic modes when viewed from the transmission input shaft, and the state transition of each driving mode according to the driving situation. Is repeated.
[0025]
(1) Series (series & parallel) travel modes
When the vehicle is traveling at low speed or reverse, the lockup clutch 6 is released, the motor 1 is driven by the engine 1 as a generator, and the vehicle travels mainly by the motor B4. At this time, part of the driving force of the engine 1 is input to the sun gear 3a of the planetary gear unit 3, and is combined with the driving force of the motor B4 of the ring gear 3c and output from the carrier 3b.
[0026]
(2) Parallel travel mode
At medium and high speeds, the lockup clutch 6 is engaged to couple the sun gear 3a and the ring gear 3c of the planetary gear unit 3, and the driving force of the motor B4 is added from the ring gear 3c to the driving force of the engine 1 and output from the carrier 3b. The vehicle travels using the torque of both the engine 1 alone and the engine 1 and the motor B4.
[0027]
(3) Braking force regeneration mode
When decelerating, the braking force is regenerated by the motor B4 in cooperation with the brake control. That is, the braking force corresponding to the depression amount of the brake pedal is shared with the regenerative braking force equivalent to the engine brake by the regenerative braking force by the motor B4 and the friction braking force by the brake mechanism to perform regenerative braking.
[0028]
Further, in the control device 15, in the drive control of the hybrid vehicle, Transmission oil When the temperature of the engine is equal to or lower than a preset temperature value, the driving force of the engine 1 is increased, and the motor A2 regenerates the generated driving force to generate electric power. have.
[0029]
Specifically, the control device 15 includes an accelerator pedal sensor 21, a vehicle speed sensor 22, Transmission oil A temperature sensor 23, a main battery remaining capacity (SOC) detector 24, a brake pedal sensor 25, etc. are connected, and the amount of depression of the accelerator pedal, the vehicle speed, Transmission oil The temperature, SOC, brake pedal depression amount, and the like are input, and the above-described drive control of the hybrid vehicle is executed.
[0030]
The drive control of the hybrid vehicle will be described with reference to the flowchart of FIG. First, in step (hereinafter abbreviated as “S”) 101, necessary parameters are read, and the process proceeds to S 102 where the accelerator opening is detected from the accelerator pedal depression amount from the accelerator pedal sensor 21. Thereafter, the process proceeds to S103, and the driver request output Pwant by the driver is calculated from the accelerator opening and the vehicle speed.
[0031]
Next, the routine proceeds to S104, where the engine speed Ne is determined from the vehicle speed, gear ratio, etc., and the routine proceeds to S105, where the engine output Pout is set. The engine output Pout is set, for example, by associating the engine speed with an engine efficiency curve set in advance on a map of engine speed and engine output as shown in FIG.
[0032]
In step S106, the driver request output Pwant is compared with the engine output Pout. If the driver request output Pwant is smaller than the engine output Pout, the process proceeds to step S107. The engine output Pe to be performed is Pwant (Pe = Pwant), the output Pmot by the motor B4 is set to 0 (Pmot = 0), and the process proceeds to S109.
[0033]
If the driver request output Pwant is greater than or equal to the engine output Pout as a result of the comparison in S106, the process proceeds to S108, and the engine output Pout that is insufficient with respect to the driver request output Pwant is supplemented with the output Pmot from the motor B4. That is, the engine output Pe output to the engine 1 is Pout (Pe = Pout), the output Pmot by the motor B4 is (Pwant-Pout), and the process proceeds to S109.
[0034]
When the setting of the engine output Pe and the output Pmot by the motor B4 is completed in S107 or S108 and the process proceeds to S109, it is determined whether or not the motor A2 is in the drive state. If the motor A2 is in the drive state, the process proceeds to S110 and continues as normal. Control and exit the program.
[0035]
Conversely, when it is determined in S109 that the motor A2 is not in the driving state, the process proceeds to S111, Transmission oil It is determined whether the temperature is equal to or lower than a preset temperature value. And as a result of this determination, Transmission oil If the temperature is higher than the set temperature value, the process proceeds to S110, where normal control is performed and the program is exited.
[0036]
On the other hand, as a result of determination in S111, Transmission oil If it is determined that the temperature is equal to or lower than the set temperature value, the process proceeds to S112, and the engine 1 is driven more and the motor A2 is driven with this extra driving force to generate heat, and the power generation amount increment amount α is calculated. To do. For example, in the first embodiment, the increment amount α of the power generation amount of the motor A2 is obtained by increasing the output of the engine 1 to the maximum, and α = Pout−Pwant. The increment amount α of the power generation amount of the motor A2 is set with an upper limit. That is, if the upper limit value set in advance is α ′, α = α when α <α ′, and α = α ′ when α ≧ α ′.
[0037]
Thereafter, the process proceeds to S113, in which the previously set engine output Pe is corrected with the increment amount α of the power generation amount of the motor A2 (Pe = Pe + α), and the power generation amount (= α) of the motor A2 is set and output. Exit the program.
[0038]
That is, as shown in FIG. Transmission oil When the temperature is lower than the set temperature value, the engine output Pe is increased by α, and the motor A2 is driven by the increased output α to generate power. Thus, the heat generated by the motor A2 Transmission oil Increase the temperature quickly, Transmission oil The transmission loss in the power transmission system including CVT5 due to the low temperature and high viscosity of the oil is reduced, and the fuel consumption is improved.
[0039]
The first embodiment is described as a series & parallel hybrid vehicle having two motors, a motor A2 mainly used for power generation and a motor B4 mainly used for driving. Needless to say, the present invention can also be applied to a parallel hybrid vehicle in which driving is performed by a single motor.
[0040]
Next, FIGS. 5 to 7 relate to a second embodiment of the present invention, FIG. 5 is a flowchart of drive control of a hybrid vehicle, FIG. 6 is a characteristic diagram showing the relationship between the engine speed and the engine output, and FIG. It is comparison explanatory drawing of the normal time of driving force distribution at the time of low temperature. In the second embodiment, the drive control of the hybrid vehicle having the configuration described in the first embodiment is performed. Transmission oil When the oil temperature of the engine is lower than a preset temperature value, the driving force of the engine 1 is reduced and the driving force of the motor B4 is increased. Are denoted by the same reference numerals, and description thereof is omitted.
[0041]
That is, as shown in the flowchart of FIG. 5, the drive control executed by the hybrid vehicle control device 15 according to the second embodiment is as shown in the flowchart of FIG. In step S102, the accelerator opening is detected. In step S103, the driver request output Pwant by the driver is calculated. Next, the process proceeds to S104, the engine speed Ne is determined, the process proceeds to S105, the engine output Pout is set, the process proceeds to S106, and the driver request output Pwant and the engine output Pout are compared. If the driver request output Pwant is smaller than the engine output Pout as a result of this comparison, the process proceeds to S107, and the engine output Pe output to the engine 1 is set to Pwant (Pe = Pwant) and the motor B4 to drive only by the engine. The output Pmot is set to 0 (Pmot = 0) and the process proceeds to S201. If the driver request output Pwant is greater than or equal to the engine output Pout as a result of the comparison in S106, the process proceeds to S108, and the engine output Pout that is insufficient with respect to the driver request output Pwant is supplemented with the output Pmot from the motor B4. That is, the engine output Pe output to the engine 1 is Pout (Pe = Pout), the output Pmot by the motor B4 is (Pwant-Pout), and the process proceeds to S201.
[0042]
After setting the engine output Pe and the output Pmot by the motor B4 in S107 or S108, the process proceeds to S201. Transmission oil It is determined whether the temperature is equal to or lower than a preset temperature value. And as a result of this determination, Transmission oil If the temperature is higher than the set temperature value, the process proceeds to S202, and the engine output Pe set in S107 or S108 and the output Pmot by the motor B4 are output and the program is exited.
[0043]
On the other hand, as a result of the determination in S201, Transmission oil When it is determined that the temperature is equal to or lower than the set temperature value, the process proceeds to S203, where the drive ratio of the motor B4 is increased, and an increment amount α of the output of the motor B4 is calculated so that the motor B4 generates more heat. The increment amount α of the output of the motor B4 is, for example, a constant value (α1kw) set in advance in the second embodiment (α = α1kw). In addition, the increment amount α of the output of the motor B4 is determined in advance. Transmission oil Alternatively, the map may be set with reference to this map value. The increment amount α of the output of the motor B4 is set so that the output of the motor B4 does not exceed the preset maximum output value Pmotlim. That is, if Pmot + α <Pmotlim, α = α, and if Pmot + α ≧ Pmotlim, α = Pmotlim−Pmot.
[0044]
Thereafter, the process proceeds to S204, where the previously set engine output Pe is corrected (Pe = Pe−α), the output of the motor B4 is corrected (Pmot = Pmot + α), and the program exits.
[0045]
For example, as shown in FIG. 6, when the engine output Pout is lower than the driver request output Pwant, this shortage (Pwant-Pout) is usually compensated by the output of the motor B4 as shown in FIG. At this time, Transmission oil When the temperature is lower than the set temperature value, the driving force of the engine 1 is decreased and the driving force of the motor B4 is controlled to be increased to increase the driving ratio of the motor B4. With this heat, Transmission oil Increase the temperature quickly, Transmission oil The transmission loss in the power transmission system including CVT5 due to the low temperature and high viscosity of the oil is reduced, and the fuel consumption is improved.
[0046]
In the second embodiment, a series & parallel hybrid vehicle having two motors, a motor A2 mainly used for power generation and a motor B4 mainly used for driving, is described. Needless to say, the present invention can also be applied to a parallel hybrid vehicle in which driving is performed by a single motor.
[0047]
Next, FIG. 8 and FIG. 9 relate to the third embodiment of the present invention, FIG. 8 is a flowchart of the hybrid vehicle drive control, and FIG. is there. In the third embodiment, the drive control of the hybrid vehicle having the configuration described in the first embodiment is performed. Transmission oil When the oil temperature is lower than a preset temperature value, the driving force of the motor B4 is increased and the driving force increased by the motor A2 is regenerated, and the same configuration as in the first embodiment The same reference numerals are used for the steps and the description thereof is omitted.
[0048]
That is, as shown in the flowchart of FIG. 8, the drive control executed by the hybrid vehicle control device 15 according to the third embodiment is as shown in the flowchart of FIG. In step S102, the accelerator opening is detected. In step S103, the driver request output Pwant by the driver is calculated. In step S104, the engine speed Ne is determined. In step S105, the engine output Pout is determined. Set.
[0049]
Thereafter, the process proceeds to S301, where the required power generation amount SOCreq is calculated based on the signal from the SOC detector 24, and this required power generation amount is set as the power generation Pmot2 of the power generation motor (motor A2). The required power generation amount SOCreq is calculated as SOCreq = SOCfull−SOC, where SOC is the remaining battery capacity from the SOC detector 24 and SOCfull is the charge amount when the battery is fully charged.
[0050]
Next, in S106, the driver request output Pwant and the engine output Pout are compared. If the driver request output Pwant is smaller than the engine output Pout as a result of this comparison, the process proceeds to S107, and the engine output Pe output to the engine 1 is set to Pwant (Pe = Pwant) and the motor B4 to drive only by the engine. The output Pmot1 is set to 0 (Pmot1 = 0) and the process proceeds to S302. If the driver request output Pwant is greater than or equal to the engine output Pout as a result of the comparison in S106, the process proceeds to S108, and the engine output Pout that is insufficient with respect to the driver request output Pwant is supplemented with the output Pmot1 from the motor B4. That is, the engine output Pe output to the engine 1 is Pout (Pe = Pout), the output Pmot1 from the motor B4 is (Pwant-Pout), and the process proceeds to S302.
[0051]
When the setting of the engine output Pe and the output Pmot1 by the motor B4 is completed in S107 or S108, the process proceeds to S302. Transmission oil It is determined whether the temperature is equal to or lower than a preset temperature value. And as a result of this determination, Transmission oil If the temperature is higher than the set temperature value, the process proceeds to S303, and the power generation Pmot2 of the motor A2 set in S301, the engine output Pe set in S107 or S108, and the output Pmot1 set by the motor B4 are output as they are. Exit.
[0052]
The relationship between the engine output Pe output in S303, the output Pmot1 from the motor B4, and the generated power Pmot2 of the motor A2 is Pwant = (Pe−Pmot2) + Pmot1.
[0053]
On the other hand, as a result of the determination in S302, Transmission oil If it is determined that the temperature is equal to or lower than the set temperature value, the process proceeds to S304, where both the motor A2 and the motor B4 are driven to increase the power, and both the motor A2 and the motor B4 generate more heat to increase the generated power Pmot2 of the motor A2. The quantity α is calculated. The increment amount α of the generated power Pmot2 of the motor A2 is, for example, a constant value (α2kw) preset in the third embodiment (α = α2kw). In addition, the increment amount α of the generated power Pmot2 of the motor A2 is determined in advance. Transmission oil Alternatively, the map may be set with reference to this map value. Further, the increment amount α of the generated power Pmot2 of the motor A2 is set so that the output of the motor A2 does not exceed the preset maximum output value Pmotlima. That is, if Pmot2 + α <Pmotlima, α = α, and if Pmot2 + α ≧ Pmotlima, α = Pmotlima−Pmot2.
[0054]
Thereafter, the process proceeds to S305, where the engine output Pe set in S107 or S108, the generated power Pmot2 (= Pmot2 + α) of the motor A2 corrected by the increment amount α of the generated power Pmot2 of the motor A2, and the increase of the generated power Pmot2 of the motor A2. An output Pmot1 (= Pmot1 + α) by the motor B4 corrected by the amount α is output.
[0055]
Note that the relationship between the engine output Pe output in S305, the output Pmot1 from the motor B4, and the generated power Pmot2 of the motor A2 is expressed using Pmot1 and Pmot2 before correction: Pwant = (Pe− (Pmot2 + α)) + (Pmot1 + α).
[0056]
For example, as shown in FIG. 6 in the second embodiment, when the engine output Pout is lower than the driver request output Pwant, this shortage (Pwant-Pout) is usually equal to the motor as shown in FIG. Supplemented by the output Pmot1 of B4. Further, the motor A2 is driven so as to have the generated power Pmot2 in accordance with the required power generation amount SOCreq of the battery. At this time, Transmission oil When the temperature is lower than the set temperature value, the output Pmot1 of the motor B4 is increased by α, and the motor A2 is driven by this increased output α to generate electric power. In this way, the heat generated by both motor A2 and motor B4, Transmission oil Increase the temperature quickly, Transmission oil The transmission loss in the power transmission system including CVT5 due to the low temperature and high viscosity of the oil is reduced, and the fuel consumption is improved.
[0057]
Next, FIGS. 10 to 12 relate to a fourth embodiment of the present invention, FIG. 10 is a flowchart of drive control of a hybrid vehicle, FIG. 11 is an explanatory diagram of a driver required braking force of the hybrid vehicle, and FIG. It is comparison explanatory drawing of the normal time and low temperature of motive power. In the fourth embodiment, the drive control of the hybrid vehicle having the configuration described in the first embodiment is performed. Transmission oil When the oil temperature falls below a preset temperature value, the ratio of the regenerative braking force by the motor B4 is increased particularly during braking.
[0058]
That is, in the drive control executed by the hybrid vehicle control device 15 according to the fourth embodiment, as shown in the flowchart of FIG. 10, first, necessary parameters are read in S401, and the brake pedal sensor 25 is read in S402. The depression amount S of the brake pedal is detected.
[0059]
Next, the process proceeds to S403, where the driver-requested braking force Fwant requested by the driver based on the depression amount S of the brake pedal is used using, for example, a characteristic diagram or function set in advance as shown in FIG. Set.
[0060]
Thereafter, the process proceeds to S404, in which the motor regenerative braking force Fmot having a preset value is set based on the shift range position, the depression amount S of the brake pedal sensor 25, and the like. Then, the friction brake force FBRK is set from the motor regenerative brake force Fmot, the regenerative brake force Fe equivalent to the engine brake obtained in advance, and the driver request braking force Fwant set in S403 (FBRK = Fwant−Fmot− Fe).
[0061]
Next, the process proceeds to S405. Transmission oil It is determined whether the temperature is equal to or lower than a preset temperature value. And as a result of this determination, Transmission oil If the temperature is higher than the set temperature value, the program exits with each brake force set in S404.
[0062]
In addition, as a result of the determination in S405, Transmission oil If it is determined that the temperature is equal to or lower than the set temperature value, the process proceeds to S406, and an increment amount α of the motor regenerative braking force Fmot generated by the motor B4 is calculated so as to increase the driving rate during regeneration of the motor B4 to generate heat. . For example, in the fourth embodiment, the increment amount α is 20% of the motor regenerative braking force Fmot (that is, α = 0.2 · Fmot). The increment amount α of the output of the motor B4 is set so that the output of the motor B4 does not exceed the preset maximum output value Pmotlim. That is, if Pmot + α <Pmotlim, α = α, and if Pmot + α ≧ Pmotlim, α = Pmotlim−Pmot.
[0063]
Thereafter, the process proceeds to S407, and the motor regenerative brake force Fmot and the friction brake force FBRK set in S404 are corrected and set by the increment amount α of the output of the motor B4. That is, Fmot = Fmot + α and FBRK = FBRK−α.
[0064]
For example, as shown in FIG. 12, the α component of the braking force normally obtained by the friction braking force FBRK is Transmission oil When the temperature is lower than the set temperature value, by obtaining the motor regenerative braking force Fmot, the drive of the motor B4 is increased and more heat is generated. With this heat, Transmission oil Increase the temperature quickly, Transmission oil The transmission loss in the power transmission system including CVT5 due to the low temperature and high viscosity of the oil is reduced, and the fuel consumption is improved.
[0065]
In the fourth embodiment, the ratio of the motor regenerative braking force Fmot and the friction braking force FBRK is changed. Transmission oil The amount of heat to warm up is controlled. For this reason, the fourth embodiment is suitable for a series hybrid vehicle or a parallel hybrid vehicle equipped with only one motor or an electric vehicle without an engine with only a motor, as long as it has a motor capable of regenerating driving force and generating electric power. Needless to say, can also be applied.
[0066]
【The invention's effect】
As described above, according to the present invention, the transmission oil can be easily heated by changing only the control without adding a special system for heating the transmission oil, and includes the transmission. It becomes possible to improve the fuel consumption by reducing the transmission loss.
[Brief description of the drawings]
FIG. 1 is a configuration explanatory diagram of a drive control system of a hybrid vehicle according to a first embodiment of the present invention.
FIG. 2 is a flowchart of drive control of the hybrid vehicle
FIG. 3 is a characteristic diagram showing the relationship between engine speed and engine output.
FIG. 4 is a comparative explanatory diagram of normal and low temperature driving force and power generation amount.
FIG. 5 is a flowchart of hybrid vehicle drive control according to the second embodiment of the present invention;
FIG. 6 is a characteristic diagram showing the relationship between engine speed and engine output.
FIG. 7 is a comparative explanatory diagram of normal and low temperature driving force distribution.
FIG. 8 is a flowchart of hybrid vehicle drive control according to a third embodiment of the present invention;
FIG. 9 is a comparative explanatory diagram of normal and low temperature driving force and power generation amount.
FIG. 10 is a flowchart of hybrid vehicle drive control according to a fourth embodiment of the present invention;
FIG. 11 is an explanatory diagram of the driver required braking force of the hybrid vehicle
FIG. 12 is a comparative explanatory diagram of normal braking force and low temperature
[Explanation of symbols]
1 engine
2 Motor A
4 Motor B
5 CVT
15 Control device (control means)
23 Transmission oil Temperature sensor

Claims (3)

Engine,
A transmission for transmitting and receiving at least the driving force of the engine by shifting,
A motor disposed in the vicinity of the transmission, capable of regenerating driving force and generating driving force and generating heat to raise the temperature of transmission oil of the transmission;
Temperature detecting means for detecting the temperature of transmission oil of the transmission;
Control means for increasing the temperature of the transmission oil of the transmission by driving or regenerating by the motor when the temperature of the transmission oil of the transmission is lower than a preset temperature value;
The control means reduces the driving force of the engine and drives the motor to generate a traveling driving force when the temperature of transmission oil of the transmission is lower than a preset temperature value. raising the temperature of the transmission oil for the transmission, the controller features and to Ruha hybrid vehicle to maintain a driving force generated on the vehicle. Engine,
A transmission for transmitting and receiving at least the driving force of the engine by shifting,
A motor disposed in the vicinity of the transmission, capable of regenerating driving force and generating driving force and generating heat to raise the temperature of transmission oil of the transmission;
Temperature detecting means for detecting the temperature of transmission oil of the transmission;
Control means for increasing the temperature of the transmission oil of the transmission by driving or regenerating by the motor when the temperature of the transmission oil of the transmission is lower than a preset temperature value;
The motors are two motors, a first motor that can freely generate driving force by driving and a second motor that can regenerate driving force,
The control means increases the driving force of the first motor and increases the driving force of the first motor when the temperature of the transmission oil of the transmission is lower than a preset temperature value. in regenerated by raising the temperature of the transmission oil for the transmission, the controller features and to Ruha hybrid vehicle to maintain a driving force generated on the vehicle. Engine,
A transmission for transmitting and receiving at least the driving force of the engine by shifting,
A motor disposed in the vicinity of the transmission, capable of regenerating driving force and generating driving force and generating heat to raise the temperature of transmission oil of the transmission;
Temperature detecting means for detecting the temperature of transmission oil of the transmission;
Control means for increasing the temperature of the transmission oil of the transmission by driving or regenerating by the motor when the temperature of the transmission oil of the transmission is lower than a preset temperature value;
The control means sets a necessary braking force by at least a friction braking force and a regenerative braking force by regeneration of the motor at the time of braking,
The control means drives the motor to increase the ratio of the regenerative braking force by the motor during braking when the temperature of the transmission oil of the transmission is lower than a preset temperature value. raising the temperature of the transmission oil for the transmission, the controller features and to Ruha hybrid vehicle to maintain the braking force generated in the vehicle.

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