JP2006206040A - Vehicular drive control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular drive control device that can control motor torque in a combination of a generator for generating DC voltage and DC current and an AC motor. <P>SOLUTION: A motor-required power Pm required by the motor 4 is calculated from a torque command value Tt and a motor speed Vm, and according to the motor-required power Pm, the field system of the generator 7 is controlled. In the process, a target output power PG to be output by the generator 7 is calculated from the motor-required power Pm, and a field current Ifg to the generator 7 is controlled such that an actual output power P of the generator 7 becomes equal to the target output power PG. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle drive control device that drives a generator with an internal combustion engine (engine) that drives a main drive shaft, and drives an AC motor with the output of the generator.

As a conventional vehicle drive control device, there is known a device in which a driven shaft is driven by a direct current motor driven by electric power of a generator and a drive torque is controlled by controlling a field current of the direct current motor. (For example, refer to Patent Document 1).
JP 2001-239852 A

  However, in the above conventional vehicle drive control device, since the motor torque is controlled by applying a DC motor, it is necessary to increase the armature current of the DC motor in order to increase the torque. Since there is a limit in the life of brushes of DC motors, there is a limit in the increase in armature current, and there is an unresolved problem that it is difficult to apply to heavy vehicles or that 4WD performance cannot be improved. .

By the way, it is conceivable to control the motor torque by applying a configuration of an AC motor + inverter instead of the DC motor, but in this case, a stabilized power source such as a battery is required. When such a stabilized power supply is employed in the electric 4WD, for example, a dedicated battery capable of generating an output voltage of 50 V or more is required, and there is an unsolved problem that it is disadvantageous in terms of cost and mountability.
Accordingly, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and provides a vehicle drive control device capable of controlling motor torque by a combination of a generator and an AC motor. The purpose is that.

  In order to achieve the above object, the vehicle drive control apparatus according to the present invention calculates the motor required power required by the AC motor by the motor required power calculation means, and the motor required power calculated by the motor required power calculation means. Based on the power, the target output power to be output by the generator is calculated by the target output power calculation means, and the field control means calculates the target output power based on the target output power calculated by the target output power calculation means. To control.

  According to the present invention, the target output power that the generator should output is calculated from the power required by the AC motor, and control is performed so that the output power of the generator becomes the target output power. With this combination, it is possible to control the motor torque, and it is possible to improve the mountability and the 4WD performance.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram when the present invention is applied to a four-wheel drive vehicle.
As shown in FIG. 1, in the vehicle of this embodiment, left and right front wheels 1L and 1R are main drive wheels driven by an engine 2 that is an internal combustion engine, and left and right rear wheels 3L and 3R are driven by a motor 4. Possible driven wheel.

  For example, a main throttle valve and a sub-throttle valve are interposed in the intake pipe line of the engine 2. The throttle opening of the main throttle valve is adjusted and controlled according to the amount of depression of the accelerator pedal. The sub-throttle valve uses a step motor or the like as an actuator, and the opening degree is adjusted and controlled by a rotation angle corresponding to the number of steps. Therefore, by adjusting the throttle opening of the sub-throttle valve to be equal to or less than the opening of the main throttle valve, the engine output torque can be reduced independently of the driver's operation of the accelerator pedal. That is, the adjustment of the opening degree of the sub-throttle valve is the driving force control that suppresses the acceleration slip of the front wheels 1L, 1R by the engine 2.

The output torque Te of the engine 2 is transmitted to the left and right front wheels 1L and 1R through the transmission and the reference gear 5. Further, a part of the output torque Te of the engine 2 is transmitted to the generator 7 via the endless belt 6, so that the generator 7 has a rotation speed Ng obtained by multiplying the rotation speed Ne of the engine 2 by the pulley ratio. Rotate.
The generator 7 becomes a load on the engine 2 in accordance with the field current Ifg adjusted by the 4WD controller 8, and generates power in accordance with the load torque. The magnitude of the power generated by the generator 7 is determined by the magnitude of the rotational speed Ng and the field current Ifg. The rotational speed Ng of the generator 7 can be calculated from the rotational speed Ne of the engine 2 based on the pulley ratio.

  FIG. 2 is a diagram showing the structure of the field current drive circuit of the generator 7. As shown in FIG. 2A, this circuit applies a configuration in which a constant voltage power source such as a 14V battery 7a of a vehicle and an output voltage of the generator itself are selected as a field current power source. Is connected to the field coil 7b to switch the transistor 7c. In this case, when the generator output is lower than the battery voltage Vb, the battery voltage Vb becomes a power source for the field coil 7b in a separate excitation region, the generator output increases, and the output voltage Vg is equal to or higher than the battery voltage Vb. Then, the output voltage Vg of the generator is selected as a self-excited region and becomes a power source for the field coil 7b. That is, since the field current value can be increased by the power supply voltage of the generator, the generator output can be significantly increased.

In the field current drive circuit, only the 14V battery 7a of the vehicle (only the separate excitation region) may be applied as the field current power source as shown in FIG. 2 (b).
The electric power generated by the generator 7 can be supplied to the motor 4 via the junction box 10 and the inverter 9. The drive shaft of the motor 4 can be connected to the rear wheels 3L and 3R via the speed reducer 11 and the clutch 12. In addition, the motor 4 of this embodiment is an AC motor. Moreover, the code | symbol 13 in a figure shows a difference gear.

In the junction box 10, a relay for connecting and disconnecting the inverter 9 and the generator 7 is provided. In a state where this relay is connected, DC power supplied from the generator 7 via a rectifier (not shown) is converted into three-phase AC in the inverter 9 to drive the motor 4.
The junction box 10 is provided with a generator voltage sensor that detects a generated voltage and a generator current sensor that detects a generated current that is an input current of the inverter 9. These detection signals are sent to the 4WD controller 8. Is output. Further, a resolver is connected to the drive shaft of the motor 4 and outputs a magnetic pole position signal θ of the motor 4.

The clutch 12 is a wet multi-plate clutch, for example, and performs fastening and releasing according to a command from the 4WD controller 8. In this embodiment, the clutch as the fastening means is a wet multi-plate clutch. However, for example, a powder clutch or a pump-type clutch may be used.
Each wheel 1L, 1R, 3L, 3R is provided with a wheel speed sensor 27FL, 27FR, 27RL, 27RR. Each wheel speed sensor 27FL, 27FR, 27RL, 27RR outputs a pulse signal corresponding to the rotation speed of the corresponding wheel 1L, 1R, 3L, 3R to the 4WD controller 8 as a wheel speed detection value.

  The 4WD controller 8 includes an arithmetic processing unit such as a microcomputer, for example, and includes wheel speed signals detected by the wheel speed sensors 27FL to 27RR, output signals of voltage sensors and current sensors in the junction box 10, An output signal of a resolver connected to the motor 4 and an accelerator opening corresponding to an amount of depression of an accelerator pedal (not shown) are input.

As shown in FIG. 3, the 4WD controller 8 includes a target motor torque calculator 8A, a motor required power calculator 8B as a motor required power calculator, a generator controller 8C, a motor controller 8D, a TCS controller 8E, a clutch A control unit 8F is provided.
The target motor torque calculation unit 8A calculates the motor torque command value Tt from the wheel speed difference between the front and rear wheels calculated based on the wheel speed signals of the four wheels and the accelerator pedal opening signal.

FIG. 4 is a block diagram showing details of the target motor torque calculator 8A. First, the front / rear rotation difference calculation unit 81 calculates the front / rear rotation difference ΔV based on the following equation based on the wheel speed signals Vfr to Vrr of the four wheels.
ΔV = (Vfr + Vfl) / 2− (Vrr−Vrl) / 2 (1)
Then, based on the front-rear rotation difference ΔV, the map stored in advance by the first motor driving force calculation unit 82 is referred to calculate the first motor driving force TΔV and output it to the select high unit described later. The first motor driving force TΔV is set so that the front-rear rotation difference ΔV is increased and proportionally larger.

The vehicle speed calculation unit 83 calculates a vehicle speed signal V by selecting low the wheel speed signal of the four wheels and the total driving force F generated by the vehicle. Here, the total driving force F is obtained by the sum of the front wheel driving force estimated from the torque converter slip ratio and the rear wheel driving force estimated from the motor torque command value Tt.
The second motor driving force calculator 84 calculates the second motor driving force Tv. Specifically, the calculation is performed with reference to a map stored in advance based on the vehicle speed V output from the vehicle speed calculation unit 83 and the accelerator opening degree Acc. The second motor driving force Tv is set so as to increase as the accelerator opening Acc increases and to decrease as the vehicle speed V increases.

Next, in the select high unit 85, the first motor driving force TΔV output from the first motor driving force calculation unit 82 and the second motor driving force Tv output from the second motor driving force calculation unit 84 are obtained. The selected high value is output to the rear wheel TCS control unit 86 as the target torque Ttt.
Then, based on the rear wheel speeds Vrl and Vrr and the vehicle speed V, rear wheel traction control control is performed by a known method, and a final torque command value Tt of the motor 4 is output.

Based on the torque command value Tt calculated by the target motor torque calculation unit 8A and the motor rotation speed Vm, the motor required power calculation unit 8B in FIG. 3 calculates the power Pm required for the motor 4 based on the following equation. calculate.
Pm = Tt × Vm (2)
The motor control unit 8D performs known vector control shown in FIG. 5 from the torque command value Tt and the motor rotation speed Vm. Then, the switching control signal of the three-phase power element is output to the inverter 9 to control the three-phase alternating current.

The TCS control unit 8E generates an engine generated drive torque demand signal for the ECM by a known method based on the engine generated drive torque demand signal Tet from the engine torque controller (ECM), the front wheel rotational speeds Vfr and Vfl, and the vehicle speed V. Front wheel traction control control is performed by returning Te.
The clutch control unit 8F controls the state of the clutch 12, and controls the clutch 12 to be in a connected state while determining that it is in the four-wheel drive state.

FIG. 6 is a block diagram illustrating details of the generator control unit 8 </ b> C that performs power generation control of the generator 7.
The generator control unit 8C includes a target generated power calculating unit 101, a generated power limiting unit 102, a target generated power determining unit 103, and a generated power control unit 104, and the field current Ifg of the generator 7 is calculated. Control.
The target generated power calculating unit 101 calculates the generator required power Pg to be output by the generator 7 based on the following equation based on the motor required power Pm output from the motor required power calculating unit 8B described above.
Pg = Pm / Иm (3)
Here, Иm is the motor efficiency. That is, the generator required power Pg must be output by the motor efficiency higher than the motor required power Pm.

The generated power limiting unit 102 outputs generated power limit values PL1 and PL2. The power limit value PL1 is an upper limit value for preventing the generated power from exceeding the power determined according to the transmittable torque of the belt that drives the generator 7, and is calculated based on the following equation.
PL1 = Tb × ωg × Иg (4)
Here, Tb is the torque that can be transmitted to the belt, ωg is the rotational speed of the generator 7, Иg is the generator efficiency, and PL1 is the maximum amount of power that the generator 7 can generate when the belt-transmittable torque is Tb. Equivalent to.

The power limit value PL2 is an upper limit value for preventing the generated power from exceeding electric power that may cause engine stall or drivability deterioration due to excessive engine load. This limit value PL2 is given from an engine torque controller (ECM).
Then, the calculation results of the target generated power calculating unit 101 and the generated power limiting unit 102 are input to the target generated power determining unit 103, the generator required power Pg and the power limit values PL1 and PL2 are selected low, and the generator A target output power PG is calculated.
This target output power PG is input to the generated power control unit 104, and the generated power control unit 104 controls the actual output power P so that the generator 7 outputs the target output power PG.

In FIG. 6, the processing of the target generated power calculation unit 101, the generated power limit unit 102, and the target generated power determination unit 103 corresponds to the target output power calculation unit, and the processing of the generated power control unit 104 corresponds to the field control unit. Yes.
FIG. 7 is a block diagram showing the generated power control unit 104 in the first embodiment. In the generated power control unit 104 in the first embodiment, the generator field current is monitored while monitoring the actual generator field current Ifg so that the deviation between the target output power PG and the actual output power P becomes zero. The value is fed back.

First, the output voltage Vdc from the generator voltage sensor and the output current Idc from the generator current sensor are input to the actual power calculation unit 201, and the actual output power P (= Vdc × Idc) is multiplied by these values. Is calculated.
The deviation ΔP between the actual output power P and the target output power PG is input to the PID control unit 202, and the PID control unit 202 outputs a target field current Ift that makes the deviation ΔP zero.

In the present embodiment, a field current sensor is provided as field current detection means to detect the actual generator field current Ifg. Then, a deviation ΔIf between the actual field current Ifg detected by the field current sensor and the target field current Ift is obtained and output to the PID control unit 203. The PID control unit 203 controls the real field current Ifg so that the deviation ΔIf becomes zero.
Thereby, the actual output power P of the generator 7 coincides with the target output power PG. In FIG. 7, the processing of the actual power calculation unit 201 corresponds to the output power calculation unit, and the processing of the PID control units 202 and 203 corresponds to the generator output control unit.

Thus, in the first embodiment, the target output power to be output by the generator is calculated from the power required by the motor, and the actual output power calculated from the output voltage and output current of the generator is Since the field current of the generator is controlled so as to be the target output power, the generator can appropriately supply the power required by the motor, and the motor can output the torque appropriately.
Furthermore, since the field current of the generator is monitored and feedback control is performed so that the actual field current follows the target field current, the generated power can surely follow the target power.

Next, a second embodiment of the present invention will be described.
In the second embodiment, the deviation between the target output power and the actual output power is made zero by performing PWM control on the field current of the generator in the first embodiment described above. .
FIG. 8 is a block diagram illustrating the generated power control unit 104 according to the second embodiment.
First, as in the first embodiment described above, the actual output power P is calculated by the actual power calculation unit 201, and the deviation ΔP between the actual output power P and the target output power PG is output to the PID control unit 204. The PID control unit 204 controls the PWM duty ratio D of the field current drive circuit of the generator 7 according to the deviation ΔP. Specifically, the PWM duty ratio D is increased when PG> P, and the PWM duty ratio D is decreased when PG <P.

For example, the following PID control is performed.
D = α × (PG−P) + β × ∫ (PG−P) (5)
FIG. 9 is a characteristic diagram showing the relationship between the PWM duty ratio D and the field current Ifg. The horizontal axis represents the PWM duty ratio D and the vertical axis represents the field current Ifg. As shown in this characteristic diagram, when the duty ratio D is 0%, the field current Ifg does not flow, and as the duty ratio D approaches 100%, a lot of the field current Ifg flows.

This characteristic is such that the greater the field power supply voltage Vf, the greater the slope, and the smaller the field coil resistance, the greater the slope. If the generator output voltage Vg is less than or equal to the battery voltage Vb, Ifg = A × D, and when Vg> Vb, Ifg = a × Vf × D. Here, a is a constant.
By controlling the PWM duty ratio D thus output by the PWM drive unit 205, the field current Ifg can be controlled, and as a result, the actual output power P of the generator 7 is controlled to the target output power PG. can do.

In the process of FIG. 8, the processes of the PID control unit 204 and the PWM drive unit 205 correspond to the duty ratio control means.
As described above, in the second embodiment, since the field current of the generator is PWM-controlled, all the error factors of the field current control due to the field current voltage fluctuation and the field coil resistance value fluctuation are included. Since the control can be performed with a loop having a large actual output power and a target output power, it is not necessary to provide a field current sensor as in the first embodiment, and the cost can be reduced.

  The second embodiment described above is an optimal configuration that can realize low cost, but there are some problems in the controllability of the generator. That is, when the generator voltage Vg is less than or equal to the battery voltage Vb, the PWM duty ratio D is substantially proportional to the field current Ifg, but when the generator voltage Vg is greater than the battery voltage Vb, the field power supply voltage Vf increases. Therefore, the field current Ifg becomes large even with the same duty ratio D. In other words, in order to generate the same field current Ifg as when the generator voltage Vg is high in the region where the generator voltage Vg is high, it is necessary to reduce the PWM duty ratio D.

  However, in the second embodiment described above, the increase / decrease in the PWM duty ratio D is determined based only on the magnitude relationship between the actual output power P and the target output power PG, and the magnitude of the field power supply voltage Vf is taken into consideration. Not done. Therefore, for example, as shown in FIG. 10, when a transition is made from a certain control point a where Vg ≦ Vb to a control point b where Vg> Vb, the state transition is as shown by curve A, and the overshoot and output of the power generation output There is a problem that fluctuations occur.

Therefore, in the third embodiment of the present invention, the above problem is improved so that the state transition as shown by the curve B is made when the control point a is changed to the control point b.
In the third embodiment, the weight setting of the PWM duty ratio is changed in accordance with the magnitude of the field power supply voltage in the second embodiment described above.

  That is, as shown in the block diagram of the generated power control unit 104 in the third embodiment in FIG. 11, the PID control unit 204 in the second embodiment described above is changed in PWM duty according to the magnitude of the field power supply voltage Vf. Except that the ratio weight setting is changed and replaced with the PID control unit 206 that outputs the PWM duty ratio D, it has the same configuration as in FIG. Detailed description thereof will be omitted.

In the PID control unit 206, as in the second embodiment described above, the deviation ΔP between the actual output power P and the target output power PG is input, and PID control shown in the above equation (5) is performed to obtain the PWM duty ratio D. Is output.
At this time, the α characteristic is changed according to the magnitude of the field power supply voltage Vf. That is, as shown in FIG. 12, the α characteristic in this embodiment is set to α1 when the field power supply voltage Vf is smaller than a predetermined value, and α2 smaller than α1 when the field power supply voltage Vf is equal to or larger than the predetermined value. Set to.

  Thereby, in the region where the generator voltage Vg is large, the weight of the PWM duty ratio D in the feedback control can be set smaller than that at the time of the low voltage, and the PWM duty ratio D for generating the target field current. Can be controlled appropriately. Therefore, for example, when transitioning from the control point a to the control point b in FIG.

  As described above, in the third embodiment, since the weight setting of the PWM duty ratio is changed according to the magnitude of the generator voltage, the region where the generator voltage is high is compared with the region where the generator voltage is low. Thus, the PWM duty ratio can be set small, and appropriate control can be performed without causing problems such as overshoot of the power generation output and output fluctuation as in the second embodiment described above.

In the third embodiment, the case where the α characteristic is changed according to the field power supply voltage Vf has been described. However, the present invention is not limited to this, and the α characteristic is changed according to the generator voltage Vg. You may make it do.
In the third embodiment, the case where the α characteristic is set as shown in FIG. 12 has been described. However, the present invention is not limited to this. That is, from the relationship of the field current Ifg = a × Vf × D when Vg> Vb, as shown in FIG. 13A, the contribution of the PWM duty ratio D is proportionally smaller as the generator voltage Vg is larger. You may set so that.

Further, as shown in FIG. 13B, when the generator voltage Vg is equal to or lower than the battery voltage Vb, α is fixed to a predetermined value, and α is proportional as the generator voltage Vg increases beyond the battery voltage Vb. You may set so that it may become small automatically.
Furthermore, in the third embodiment, the case where only the α characteristic is changed according to the magnitude of the field power supply voltage has been described. However, the present invention is not limited to this, and the β characteristic is also changed. Also good.

Next, a fourth embodiment of the present invention will be described.
In the fourth embodiment, the multiplication value of the field power supply voltage and the PWM duty ratio is feedback-controlled.
That is, as shown in the block diagram of the generated power control unit 104 in the fourth embodiment in FIG. 14, the PID control unit 204 in the second embodiment described above is the product of the field power supply voltage Vf and the PWM duty ratio D. Except that (Vf × D) is feedback controlled and replaced with a PID control unit 207 that outputs a PWM duty ratio D, the configuration is the same as in FIG. The detailed explanation is omitted.

The PID control unit 207 receives a deviation ΔP between the actual output power P and the target output power PG, performs PID control shown in the following equation (6), and outputs the PWM duty ratio D.
Vf × D = α × (PG−P) + β × ∫ (PG−P)
D = {α × (PG−P) + β × ∫ (PG−P)} / Vf (6)
As described above, when Vg> Vb, the field current Ifg = a × Vf × D. From this relationship, it is possible to perform feedback control assuming that (Vf × D) is the field current Ifg.

As described above, in the fourth embodiment, since the product of the field power supply voltage and the PWM duty ratio is feedback-controlled, it is possible to obtain a control effect such that the field current is substantially feedback-controlled. .
Further, without providing a change map of the α characteristic as in the third embodiment, the weight of the PWM duty ratio can be set smaller in the region where the field power supply voltage is large than in the case of the low voltage. Appropriate control in consideration of the magnitude of the magnetic power supply voltage can be performed.

Next, a fifth embodiment of the present invention will be described.
In the fifth embodiment, the generated power is controlled from the generated power characteristic using the rotational speed of the generator as a parameter.
That is, as shown in the block diagram of the generated power control unit 104 in the fifth embodiment in FIG. 15, the actual power calculation unit 201 in the first embodiment shown in FIG. 7 is deleted, and the PID control unit 202 is changed. Except for the replacement with the target field current calculation unit 208 that outputs the target field current Ift based on the rotational speed ωg of the generator 7 and the target output power PG, it has the same configuration as FIG. Parts having the same configuration are denoted by the same reference numerals, and detailed description thereof is omitted.

The 4WD controller 8 stores an output characteristic map for each rotational speed of the generator 7 as shown in FIG. 16 in advance, and the target field current calculation unit 208 first outputs corresponding to the rotational speed ωg of the generator 7. Search the characteristic map.
This output characteristic map is a diagram showing the current and voltage output by the generator 7 when the field current Ifg is constant at a predetermined rotational speed ωg, with the output current on the horizontal axis and the output voltage on the vertical axis. Finely set every minute rotation speed (for example, every 100 rpm).

When the output characteristic map at the current rotational speed ωg is retrieved, as shown in FIG. 17, the target output power PG with a margin is provided according to the constant power line P1 determined based on the target output power PG. The field current value IfF that can be supplied is calculated.
Specifically, a range P2 that is efficient for supplying the target output power PG on the constant power line P1 is determined, and this is set as a voltage / current range used for control. Then, the characteristic (3) that can cover this range with a certain margin is selected. That is, a field current value that can output with sufficient margins a voltage and a current for efficiently outputting the target output power PG is selected.

Next, the field current value IfF corresponding to the characteristic (3) is output as the target field current Ift. Note that the characteristics (4) to (6) whose margin is too large are not appropriate because there is a possibility of causing power consumption due to an increase in the field current.
By controlling so that the deviation between the target field current Ift thus selected and the actual field current Ifg detected by the field current sensor becomes zero, the actual output power P becomes the target output power Pg. Be controlled.

In the processing of FIG. 15, the processing of the target field current calculation unit 208 corresponds to the target field current calculation means.
As described above, in the fifth embodiment, since the field current of the generator is controlled from the generated power characteristic using the rotation speed of the generator as a parameter, appropriate power generation control is performed to supply the necessary power to the motor. can do.
Also, since the field current is selected so that the power of the generator can be output efficiently from the generated power characteristics, the field current is too low to generate torque, or the field current is too high and power consumption occurs. This can be surely prevented.

  In the fifth embodiment, the case where the field current value IfF calculated by the target field current calculation unit 208 is directly output as the target field current Ift has been described. However, the present invention is not limited to this. In consideration of variations in generator characteristics and changes in temperature due to temperature changes, the field current value IfF calculated by the target field current calculation unit 208 is set as the FF term and the actual output power as shown in FIG. You may make it add correction by the deviation of P and target output electric power PG.

In this case, a PI control unit 209 is provided after the target field current calculation unit 208, and the PID control unit 209 performs feedback control shown in the following equation to output the target field current Ift.
Ift = IfF + A × (PG−P) + B × ∫ (PG−P) (7)
Here, the actual output power P is obtained by multiplying the generator voltage sensor value and the generator current sensor value as in the first to fourth embodiments described above.

Next, a sixth embodiment of the present invention will be described.
In the sixth embodiment, the field current of the generator is PWM-controlled in the fifth embodiment described above.
FIG. 19 is a block diagram showing the generated power control unit 104 in the sixth embodiment.
First, similarly to the fifth embodiment described above, the target field current calculation unit 208 calculates the target field current Ift, and the deviation ΔIft between the target field current Ift and the field current converted value is calculated by the PID control unit. Output to 210. Then, the PID control unit 210 outputs a PWM duty ratio D such that the deviation ΔIft becomes zero.

  Here, since the field current Ifg = a × Vf × D is expressed as described above, the target field current Ift is expressed by Ift = a × Vf × Dt, where the target PWM duty ratio is Dt. Therefore, by performing feedback control as a field current converted value based on (Vf × D) as a field current, it is possible to obtain a control effect in which the field current is substantially feedback controlled.

The field current Ifg is controlled by controlling the PWM duty ratio D thus output by the PWM drive unit 211.
As described above, in the sixth embodiment, the field current can be feedback controlled without providing a field current sensor as in the above-described fifth embodiment, and the cost can be reduced.

  In the sixth embodiment, the case where the field current value IfF calculated by the target field current calculation unit 208 is directly output as the target field current Ift has been described. However, the present invention is not limited to this. As shown in FIG. 20, the field current value IfF calculated by the target field current calculation unit 208 is set as the FF term, and the actual output power is taken into consideration. You may make it add correction by the deviation of P and target output electric power PG.

In this case, a PI control unit 212 is provided after the field current command calculation unit 208, and the PI control unit 211 performs PI control represented by the following expression to output a target field current Ift.
Ift = IfF + A × (PG−P) + B × ∫ (PG−P) (8)
Here, the actual output power P is obtained by multiplying the generator voltage sensor value and the generator current sensor value as in the first to fourth embodiments described above.

Next, a seventh embodiment of the present invention will be described.
In the seventh embodiment, the field of the generator is controlled based on the target voltage and target current required by the motor.
That is, as shown in FIG. 21 in detail of the generator control unit 8C in the seventh embodiment, the generator control unit 8C includes a target generated power calculation unit 301, a target voltage calculation unit 302, a target current calculation unit 303, a target The field current calculation unit 304 and the field current control unit 305 are configured to calculate the target field current Ift of the generator 7 using a map based on the target voltage and the target current required by the motor 4, and actually The field current Ifg is controlled to be the target field current Ifg.

The target generated power calculation unit 301 calculates the target output power PG that the generator 7 should output based on the following equation based on the motor required power Pm output from the motor required power calculation unit 8B described above.
PG = Pm / Иm ……… (9)
Here, Иm is the motor efficiency.

The target voltage calculation unit 302 calculates a target voltage Vdc ^* required by the motor with reference to a map stored in advance based on the torque command value Tt and the motor rotation speed Nm.
Based on the target output power PG calculated by the target generated power calculation unit 301 and the target voltage Vdc ^* calculated by the target voltage calculation unit 302, the target current calculation unit 303 is based on the following equation, Required current, that is, a target current Idc ^* to be output by the generator 7 is calculated.
Idc ^* = PG / Vdc ^* (10)
The target field current calculation unit 304 outputs a control signal for controlling the field current Ifg so that the output voltage and output current of the generator 7 become the target voltage Vdc ^* and the target current Idc ^* . Specifically, a generator characteristic map using the output voltage, output current, and field current as parameters is used.

  FIG. 22A is a self-excited characteristic diagram of the generator. In the case of self-excitation, the field current is caused to flow by using the voltage generated by the generator itself. Therefore, the generator characteristic uses not the field current itself but the duty ratio of the voltage applied to the field current drive circuit as a parameter. That is, this generator characteristic indicates the voltage and current output by the generator 7 when the pulse width of the generator field current drive circuit is constant.

FIG. 22B is another excitation characteristic diagram of the generator. In the case of separate excitation, a field current is supplied by applying a field voltage from another power source, so the field current itself is used as a parameter. That is, this generator characteristic indicates the voltage and current output by the generator 7 when the generator field current is constant.
That is, when the self-excitation operation is performed, the output voltage and output current of the generator 7 are determined based on the target voltage Vdc ^* and the target current Idc ^* with reference to the self-excitation characteristic diagram shown in FIG. The characteristic (2) is selected so that the target voltage Vdc ^* and the target current Idc ^* are obtained. Then, a PWM duty ratio D for controlling the field current Ifg is output based on the field drive pulse width corresponding to the characteristic (2).

When the separate excitation operation is performed, the output voltage and output current of the generator 7 are determined based on the target voltage Vdc ^* and the target current Idc ^* with reference to the separate excitation characteristic diagram shown in FIG. The characteristic (3) is selected so that the target voltage Vdc ^* and the target current Idc ^* are obtained. Then, the field current corresponding to the characteristic (3) is output as the target field current Ift.
The field current control unit 305 controls the actual field current Ifg based on the PWM duty ratio D or the target field current Ift output from the target field current calculation unit 304.
As a result, the generator 7 outputs a voltage and current that match the target voltage Vdc ^* and the target current Idc ^* .

In FIG. 21, the processing of the target generated power calculation unit 301 corresponds to the target output power calculation unit, the processing of the target voltage calculation unit 302 corresponds to the voltage calculation unit, and the processing of the target current calculation unit 303 corresponds to the current calculation unit. It corresponds.
As described above, in the seventh embodiment, since the field is controlled so that the voltage and current required by the motor are generated by the generator, the balance between the power consumed by the motor and the power generated by the generator. Therefore, it is possible to operate at an appropriate operating point while suppressing system loss.

In the seventh embodiment, the target voltage calculator 302 calculates the target voltage Vdc ^* by referring to the map based on the torque command value Tt and the motor rotation speed Nm. The target voltage Vdc ^* is calculated by the vector sum of the d-axis voltage command value Vdr and the q-axis voltage command value Vqr calculated based on the torque command value Tt in the vector control of the motor control unit 8D. You may make it do.
Moreover, in the said 7th Embodiment, although the case where target output electric power PG was calculated based on said (9) Formula by the target generated electric power calculating part 301 was demonstrated, it is not limited to this, The above-mentioned As in the first to sixth embodiments, the target output power PG may be calculated by providing the power limit values PL1 and PL2.

Next, an eighth embodiment of the present invention will be described.
In the eighth embodiment, a target operating point of the generator is calculated based on the target output power of the generator, and the field of the generator is controlled based on the target operating point.
That is, as shown in FIG. 23 in detail of the generator control unit 8C in the eighth embodiment, the target operating point of the generator 7 is set after the target generated power determination unit 103 in the generator control unit 8C shown in FIG. The target operating point setting unit 105 is added, and the generated power control unit 104 is replaced with the generated power control unit 106 that controls the field of the generator 7 based on the target operating point set by the target operating point setting unit 105. Except for this, the same processing as in FIG. 6 is performed, and the same reference numerals are given to the portions performing the same processing as in FIG.

The target operating point setting unit 105 first calculates a motor torque command value Tt based on the following equation based on the target output power PG output from the target generated power determining unit 103, that is, the motor usable power.
Tt = (PG × Иm) / Vm (11)
Next, the input voltage and input current of the inverter 9 that can efficiently generate the motor torque command value Tt, that is, the target voltage Vt and the target current It of the generator 7 are determined within the range of the motor usable power PG. Specifically, as shown in FIG. 24, the intersection of the constant power line P corresponding to the motor usable power PG and the maximum efficiency operating dotted line η indicated by the broken line is the target operating point (Vt, It) of the generator 7. Select as
That is, the target operating point setting unit 105 sets the operating point at which the efficiency is maximum among the generator operating points capable of outputting the target output power PG as the target operating point (Vt, It).

In general, the generator efficiency is high at high voltage and low current, and the motor efficiency does not change much except when it is at a very low current. It is desirable to work. Further, since the system has an upper limit voltage V _max (for example, 60 V) and an upper limit current I _max (determined by the inverter element rating and the generator / motor design. For example, 30 A), the voltage becomes the upper limit voltage V _max . When approaching, an operating point at which the current value increases with a substantially constant or slight increase in voltage is selected, and eventually the current value increases up to the upper limit current I _max . The continuous line of these operating points is the maximum efficiency operating dotted line η, and this maximum efficiency operating dotted line η is stored in advance.
The target voltage Vt thus obtained is input to the generated power control unit 106, and the generated power control unit 106 controls the field current Ifg so that the output voltage V of the generator 7 becomes the target voltage Vt. .

FIG. 25 is a block diagram showing details of the generated power control unit 106. The generated power control unit 106 feeds back the generator field current value while monitoring the actual generator field current Ifg so that the deviation between the target voltage Vt and the output voltage V becomes zero.
First, the deviation ΔV between the output voltage V from the generator voltage sensor and the target voltage Vt is input to the PID control unit 221, and the PID control unit 221 outputs a target field current Ift that makes the deviation ΔV zero. .

  In the present embodiment, a field current sensor as a field current detection means is provided to detect the actual generator field current Ifg. Then, a deviation ΔIf between the actual field current Ifg detected by the field current sensor and the target field current Ift is obtained and output to the PID control unit 222. The PID control unit 222 controls the real field current Ifg so that the deviation ΔIf becomes zero.

  Thereby, the output voltage V of the generator 7 coincides with the target voltage Vt. That is, the current operating point determined from the output voltage V and the output current I of the generator 7 coincides with the target operating point, and the generator 7 is calculated from the power Pm required by the motor 4. The torque command value Tt corresponding to the target output power PG to be output is operated at an operating point where the torque command value Tt can be generated efficiently.

In the processing of FIG. 23, the target operating point setting unit 105 corresponds to the target operating point setting means.
As described above, in the eighth embodiment, the generator is controlled by setting the operating point having a good overall efficiency, which is the sum of the generator efficiency and the motor efficiency, among the operating points capable of outputting the target output power as the target operating point. Therefore, the generator and the inverter can be operated at an efficient operating point.
Moreover, since the field current of the generator is monitored and feedback control is performed so that the actual field current follows the target field current, the output voltage can be made to follow the target voltage with certainty.

  In the eighth embodiment, the case where the generated power control unit 106 follows the target field current Ift while monitoring the actual field current Ifg of the generator 7 has been described. However, the present invention is not limited to this. Instead, the generator field current may be PWM controlled so that the deviation between the target voltage Vt and the output voltage V becomes zero. In this case, while the PID control is performed on the deviation ΔP in the generated power control unit 104 of the second embodiment described above shown in FIG. 8, the actual output power P is set to the output power V, and the target output power PG. Is replaced with the target voltage V, and the PID control is performed on the deviation ΔV between the target voltage Vt and the output voltage V to control the PWM duty ratio D of the field current drive circuit of the generator 7.

  In addition, the generated power control unit 106 changes the weight setting of the PWM duty ratio D according to the magnitude of the field power supply voltage Vf, like the generated power control unit 104 of the third embodiment described above. Alternatively, as in the above-described generated power control unit 104 of the fourth embodiment, the multiplication value (Vf × D) of the field power supply voltage Vf and the PWM duty ratio D may be feedback-controlled. Also in this case, as described above, the actual output power P may be replaced with the output power V, and the target output power PG may be replaced with the target voltage V to perform each process.

Next, a ninth embodiment of the present invention will be described.
In the ninth embodiment, the field of the generator is controlled by performing feedback control so that the current output possible characteristic line of the generator becomes the target output possible characteristic line.
That is, as shown in FIG. 26 for details of the generator control unit 8C in the ninth embodiment, the target operating point setting unit 105 in the above-described eighth embodiment shown in FIG. The target operating point setting unit 107 that outputs the V-axis intercept V ₀ t of the output possible characteristic line St including the point is replaced with the V-axis intercept V ₀ of the output possible characteristic line S including the current operating point (V, I). Is added to the current operating point detection unit 108, and the generated power control unit 106 is set so that the V axis intercept V ₀ detected by the current operating point detection unit 108 is the target V axis intercept V ₀ set by the target operating point setting unit 107. Except for the replacement with the generated power control unit 109 that controls to be t, the same processing as in FIG. 23 is performed, and the same processing parts as in FIG. Is omitted.

  In the target operating point setting unit 107, similarly to the target operating point setting unit 105 described above, first, based on the target output power PG output from the target generated power determining unit 103, that is, the motor usable power, the above equation (5) is obtained. Based on the motor torque command value Tt. Next, as shown in FIG. 8 described above, the intersection of the power constant line P corresponding to the motor usable power PG and the maximum efficiency operating point line η is selected as the target operating point (Vt, It) of the generator 7. .

Then, a target V-axis intercept V ₀ t of the output possible characteristic line St including the target operating point (Vt, It) shown in FIG. 27 is calculated. Specifically, based on the target voltage Vt and the target current It, the target V-axis intercept V ₀ t is calculated based on the linear approximate expression Vt = −a × It + V ₀ t of the output possible characteristic line St.
Here, the output possible characteristic line is a generator output characteristic line with the rotation speed and field current of the generator as parameters, and when a field current at a certain rotation speed is given, the generator The voltage / current on this output possible characteristic line is generated. Although the actual output possible characteristic line is a non-linear line, since the output possible characteristic line in the control region is monotonically decreasing, linear approximation is used in this embodiment.

The current operating point detection unit 108 calculates the V-axis intercept V ₀ of the output possible characteristic line S including the current operating point (V, I) shown in FIG. Specifically, based on the current voltage V and current I, the V-axis intercept V ₀ is calculated based on the linear approximate expression V = −a × I + V ₀ of the output possible characteristic line S.
The generated power control unit 109 controls the increase / decrease of the field current Ifg of the generator 7 according to the magnitude relationship between the V-axis intercept V ₀ and the target V-axis intercept V ₀ t.
For example, even if the voltage and current change due to fluctuations in the input impedance on the inverter side, the voltage and current move on the output possible characteristic line of the generator, so the V-axis intercept does not change. Therefore, by matching the V-axis intercept V ₀ to the target V-axis intercept V ₀ t, to eliminate the difference between the output possible characteristic line St of the current output possible characteristic line S and target.

FIG. 28 is a block diagram showing details of the generated power control unit 109.
First, the deviation [Delta] V ₀ and V-axis intercept V ₀ which from the target V-axis intercept V ₀ t and the current operating point detecting unit 108 from the target operating point setting part 107 is input to the PID controller 223, PID controller 223 The target field current Ift is output so that the deviation ΔV ₀ becomes zero.
Then, a deviation ΔIf between the actual field current Ifg detected by the field current sensor and the target field current Ift is obtained and output to the PID control unit 224. The PID control unit 224 controls the real field current Ifg so that the deviation ΔIf becomes zero.

As a result, the V-axis intercept V ₀ matches the target V-axis intercept V ₀ t.
Thus, in the ninth embodiment, focusing on the output possible characteristic line of the generator, the difference between the output possible characteristic line including the target operating point and the output possible characteristic line including the current operating point is eliminated. In addition, since the field current of the generator is fed back, stable generator control can be performed.
In addition, since the field current of the generator is controlled so that the V-axis intercept of the current output-possible characteristic line becomes the V-axis intercept of the target output-possible characteristic line, it affects the fluctuation of the input impedance on the inverter side. Stable generator control can be performed without receiving.

In the ninth embodiment, the case where the generated power control unit 109 follows the target field current Ift while monitoring the actual field current Ifg of the generator 7 has been described. However, the present invention is not limited to this. Instead, the generator field current may be PWM-controlled as in the second embodiment described above. In this case, control is performed so that the deviation between the target V-axis intercept V ₀ t and the V-axis intercept V ₀ becomes zero.

Further, in the generated power control unit 109, the weight setting of the PWM duty ratio D is changed according to the magnitude of the field power supply voltage Vf as in the third embodiment described above, or the fourth power described above. As in the embodiment, the multiplication value (Vf × D) of the field power supply voltage Vf and the PWM duty ratio D may be feedback-controlled. In this case, PID control is performed on the deviation between the target V-axis intercept V ₀ t and the V-axis intercept V ₀ .

Next, a tenth embodiment of the present invention will be described.
In the tenth embodiment, the output power efficiency of the generator is controlled in the eighth and ninth embodiments described above, while the generator is controlled with the operating point at which the overall efficiency is maximized as the target operating point. Is set as the target operating point.
That is, in the generator control unit 8C in the tenth embodiment, the target operating point setting unit 105 in FIG. 23 or the target operating point setting unit 107 in FIG. 26 uses the maximum efficiency operating dotted line η shown in FIG. Instead of selecting the target operating point (Vt, It) of 7, the target operating point (Vt, It) of the generator 7 is selected using the maximum output operating point line Pmax shown in FIG.

  FIG. 29 is a diagram illustrating a method for selecting a target operating point in the present embodiment. Here, a curved line S indicated by a broken line is a generator output characteristic line (generator output possible characteristic line) using the generator rotational speed ωg and the field current Ifg as parameters. A hyperbolic curve P is an isoelectric line, and the output power of the generator 7 is constant on this line. That is, the output power on the output possible characteristic line S varies depending on the operating point, and the output power at the operating point α where the output possible characteristic line S and the equal power line P are in contact is the maximum output power on the output possible characteristic line S. It becomes.

The maximum output power line Pmax is a line formed by connecting the points at which the output power of the generator 7 becomes maximum at the operating points on each output possible characteristic line.
Then, the intersection of the constant power line P corresponding to the motor usable power PG and the maximum output power line Pmax is selected as the target operating point (Vt, It) of the generator 7. That is, in the target operating point setting unit in the present embodiment, among the operating points at which the target output power PG can be output, the operating point at which the output power efficiency of the generator 7 is maximized is set as the target operating point (Vt, It). Will do.
As described above, in the tenth embodiment, the generator is controlled with the operating point where the output power efficiency of the generator is good among the operating points capable of outputting the target output power as the target operating point. A desired torque can be output with the machine field current.

Next, an eleventh embodiment of the present invention will be described.
In the eleventh embodiment, an operating point within a stable region where the generator can be stably operated is set as a target operating point of the generator.
That is, in the generator control unit 8C in the eleventh embodiment, the target operating point setting unit 105 or 107 in the eighth to tenth embodiments described above executes the target operating point setting process shown in FIG. Except that the operating point (Vt, It) is set, the configuration is the same as in FIG. 23 or FIG.

In the target operating point setting process shown in FIG. 30, first, the target motor torque Tt is detected in step S1, and the process proceeds to step S2. In step S2, the motor rotation speed Nm is detected, and the process proceeds to step S3.
In step S3, the required power Pg of the generator 7 is calculated based on the target motor torque Tt and the motor rotation speed Nm. Here, the generator required power Pg = Tt × Nm / Иm.
Next, in step S4, based on the target motor torque Tt and the motor rotation speed Nm, a map stored in advance is referred to calculate the minimum required voltage Vdcmin, and then the process proceeds to step S5. The minimum required voltage Vdcmin is a minimum voltage value required for the generator 7 in order to output the generator required power Pg.

In step S5, the minimum required power line Pmin is calculated based on the constant power line corresponding to the required power Pg calculated in step S3 and the minimum required voltage Vdcmin calculated in step S4, and the process proceeds to step S6.
In step S6, the current generator speed Ng is detected, and in step S7, a stability limit line σ is selected based on the generator speed Ng. Here, the stability limit line σ is a line formed by connecting operating points capable of outputting the maximum power on each output possible characteristic line of the generator 7, and is equivalent to the above-described maximum output power line Pmax in the present embodiment. . Note that the maximum output power line Pmax with a predetermined margin may be set as the stability limit line σ.

Next, in step S8, if there is an intersection between the minimum required power line Pmin and the stability limit line σ, a voltage at the intersection, the so-called stability limit voltage Vtt is calculated, and the process proceeds to step S9.
In step S9, it is determined whether or not an intersection exists between the minimum required power line Pmin and the stability limit line σ. When the intersection exists and the stability limit voltage Vtt can be calculated, the process proceeds to step S10, and this intersection is determined. As the target operating point (Vt, It) is set, the process proceeds to step S11.

In step S11, the stability limit voltage Vtt calculated in step S8 is set as the target voltage Vt, and the target operating point setting process is terminated.
On the other hand, if the determination result in step S9 indicates that there is no intersection between the minimum required power line Pmin and the stability limit line σ, the process proceeds to step S12, and a constant power line (required power line) corresponding to the required power Pg. Assuming that the intersection with the minimum required voltage Vdcmin is set as the target operating point (Vt, It), the process proceeds to step S13.

In step S13, the minimum required voltage Vdcmin calculated in step S5 is set as the target voltage Vt, and the target operating point setting process is terminated.
That is, in this embodiment, the larger voltage value of the minimum required voltage Vdcmin and the stability limit voltage Vtt is set as the voltage value Vt of the target operating point.
In the processing of FIG. 30, the processing of steps S3 to S5 corresponds to the minimum necessary voltage calculation means, and the processing of steps S7 and S8 corresponds to the stability limit voltage calculation means.

As described above, in the eleventh embodiment, the minimum necessary voltage required for the generator to output the target output power and the stability limit voltage for the generator to stably output the target output power are set. Since the target operating point of the generator is set based on the result of the selection high, the generator can always be operated in the stable region.
In the eighth to eleventh embodiments, the target operating point setting unit of the generator control unit 8C sets an operating point at which the target output power can be output with the maximum efficiency as the target operating point, or the target output power. However, the present invention is not limited to this, and the target operation point setting methods shown in the eighth to eleventh embodiments are combined. May be applied.

Next, the operation of the present invention will be described with reference to FIG.
In FIG. 31, (a) is the accelerator opening, (b) is the vehicle speed signal, (c) is the engine command torque, (d) is the torque command value Tt, (e) is the motor required power Pm and the generator 7 This is the target output power PG.
When the accelerator opening changes as shown in FIG. 31 (a), the front wheel speeds Vfr and Vfl change as shown by the broken lines in FIG. 31 (b), and the rear wheel speeds Vrr and Vrl are one point in FIG. 31 (b). The vehicle speed V changes as indicated by the chain line, and as a result, the vehicle speed V changes as indicated by the solid line in FIG.

Further, the torque demand signal Tet determined by the ECM from the accelerator opening or the like is as shown by a broken line in FIG. 31C, and the torque demand signal Te modulated by the front wheel traction control control of the TCS control unit 8E is shown in FIG. As shown by the solid line in c).
In FIG. 31D, the thin line represents the first motor driving force TΔV, and the alternate long and short dash line represents the second motor driving force Tv. As shown in the detailed block diagram of the target motor torque calculator 8A in FIG. 6, the signal selected by the select high of the first motor driving force TΔV and the second motor driving force Tv is the target torque Ttt, and the rear wheel speed Assuming that the rear wheel TCS control does not operate due to the relationship between Vrr, Vrl and the vehicle speed V, Tt = Ttt, as shown by the bold line in FIG.

  Based on this torque command value Tt, the required motor power Pm is calculated by the required motor power calculation unit 8B, as shown by the broken line in FIG. Further, in the target generated power calculation unit 101 in FIG. 6, the generator required power Pg is calculated based on the motor required power Pm. At this time, assuming that the power limit values PL1 and PL2 output from the generated power limiter 102 are larger than the generator required power Pg, the target output power PG = Pg of the generator 7 and the solid line in FIG. As shown.

Based on each signal calculated in this manner, the field control of the generator in the first to seventh embodiments described above is performed to obtain the results shown in FIGS. 31 (f) to 31 (h).
FIG. 31 (f) shows the actual output power P of the generator 7. As is clear from this figure, the actual output power P matches the target output power PG indicated by the solid line in FIG. 31 (e), and the power that the generator 7 should output is appropriately output. Recognize.

FIG. 31G shows the output power P ₀ of the motor 4. As is apparent from this figure, the output power P ₀ of the motor 4 matches the required motor power Pm shown by the broken line in FIG. 31 (e), and the motor torque T matches the torque command value Tt. It turns out that the electric power which 4 requires is output appropriately.
Further, FIG. 31 (h) shows the motor torque T generated by the motor 4. As is apparent from this figure, it can be seen that the motor torque T matches the torque command value Tt indicated by the thick line in FIG.

As described above, in each of the above-described embodiments, appropriate motor torque control is performed by converting the DC power supplied from the generator via the rectifier into a three-phase AC by a combination of the generator and the AC motor. Can do.
In addition, as compared with the conventional mechanical type 4WD, there is an advantage that it is advantageous in terms of fuel consumption, room space, mountability, platform commonality, and 4WD performance.

It is a schematic structure figure showing an embodiment of the present invention. It is a figure which shows the structure of a generator. It is a block diagram which shows the detail of 4WD controller of FIG. It is a block diagram which shows the detail of the target motor torque calculating part of FIG. It is a block diagram which shows the detail of the motor control part of FIG. It is a block diagram which shows the detail of the generator control part of FIG. It is a block diagram which shows the detail of the generated electric power control part in 1st Embodiment. It is a block diagram which shows the detail of the generated electric power control part in 2nd Embodiment. It is a characteristic view which shows the relationship between a PWM duty ratio and a field current. It is a figure explaining the state transition in 2nd Embodiment. It is a block diagram which shows the detail of the generated electric power control part in 3rd Embodiment. It is an alpha characteristic figure in a 3rd embodiment. It is another example of the alpha characteristic figure in a 3rd embodiment. It is a block diagram which shows the detail of the generated electric power control part in 4th Embodiment. It is a block diagram which shows the detail of the generated electric power control part in 5th Embodiment. It is an output characteristic map for every rotation speed of a generator. It is a figure explaining the target field current calculation method of a target field current calculating part. It is another example in 5th Embodiment. It is a block diagram which shows the detail of the generated electric power control part in 6th Embodiment. It is another example in 6th Embodiment. It is a figure which shows the detail of the generator control part in 7th Embodiment. It is a figure explaining the target field current calculation method of the target field current calculating part in a 7th embodiment. It is a block diagram which shows the detail of the generator control part in 8th Embodiment. It is a figure explaining the selection method of the target operating point in an 8th embodiment. It is a block diagram which shows the detail of the generated electric power control part of FIG. It is a block diagram which shows the detail of the generator control part in 9th Embodiment. It is a figure explaining the outline | summary of the generator control in 9th Embodiment. It is a block diagram which shows the detail of the generated electric power control part of FIG. It is a figure explaining the selection method of the target operating point in a 10th embodiment. It is a flowchart which shows the target operating point setting process in 11th Embodiment. It is a figure explaining operation | movement of this invention.

Explanation of symbols

1L, 1R Front wheel 2 Engine 3L, 3R Rear wheel 4 Motor 6 Belt 7 Generator 8 4WD controller 8A Target motor torque calculator 8B Motor required power calculator 8C Generator controller 8D Motor controller 8E TCS controller 8F Clutch controller DESCRIPTION OF SYMBOLS 9 Inverter 10 Junction box 11 Reducer 12 Clutch 27FL, 27FR, 27RL, 27RR Wheel speed sensor 101 Target generated power calculating part 102 Generated power limiting part 103 Target generated power determining part 104 Generated power control part 105 Target operating point setting part 301 Target Generated power calculation unit 302 Target voltage calculation unit 303 Target current calculation unit 304 Target field current calculation unit 305 Field current control unit

Claims (17)

A vehicle drive control device comprising: an internal combustion engine that drives main driving wheels; a generator that is driven by the internal combustion engine; and an AC motor that is supplied with electric power from the generator via an inverter to drive the driven wheels. In
Motor required power calculation means for calculating required motor power required by the AC motor, and target output power to be output by the generator is calculated based on the motor required power calculated by the motor required power calculation means. A vehicle drive control device comprising: target output power calculation means; and field control means for controlling a field of the generator based on the target output power calculated by the target output power calculation means.   The field control means includes an output power calculation means for calculating the actual output power of the generator from the output voltage and output current of the generator, and the actual output power calculated by the output power calculation means becomes the target output power. The vehicle drive control device according to claim 1, further comprising generator output control means for controlling a field of the generator.   Field current detection means for detecting a field current of the generator is provided, and the generator output control means is detected by the field current detection means so that the actual output power becomes the target output power. 3. The vehicle drive control device according to claim 2, wherein the field current is feedback-controlled.   The generator output control means includes duty ratio control means for controlling a PWM duty ratio of a field current drive circuit of the generator so that the actual output power becomes the target output power. Item 3. The vehicle drive control device according to Item 2.   5. The vehicle drive control device according to claim 4, wherein the duty ratio control means sets the PWM duty ratio in accordance with a power supply voltage of the field current drive circuit.   The field control means calculates a target field current of the generator based on a generated power characteristic using the rotation speed of the generator as a parameter so that the generator outputs power exceeding the target output power. 2. The apparatus according to claim 1, further comprising a target field current calculation unit, wherein the field current of the generator is controlled to be a target field current calculated by the target field current calculation unit. Vehicle drive control device.   The field control means includes voltage calculation means for calculating a target voltage required by the AC motor, current calculation means for calculating a target current required by the AC motor based on the target output power and the target voltage, and 2. The vehicle drive control device according to claim 1, wherein a field of the generator is controlled so that an output voltage and an output current of the generator become the target voltage and the target current. .   The voltage calculation means calculates the target voltage based on a torque command value and a motor speed, and the current calculation means calculates the target current by dividing the target output power by the target voltage. The vehicle drive control device according to claim 7.   The field control means includes a target operating point setting means for setting a target operating point of the generator based on the target output power calculated by the target output power calculating means, and a target set by the target operating point setting means. The vehicle drive control device according to claim 1, further comprising a generator output control unit that controls a field of the generator based on an operating point.   The target operating point setting means sets, as the target operating point, an operating point at which the overall efficiency of the generator and the AC motor is maximized among operating points capable of outputting the target output power. The vehicle drive control device according to claim 9.   The target operating point setting means sets an operating point at which the output power efficiency of the generator is maximum among operating points capable of outputting the target output power as the target operating point. The vehicle drive control device described in 1.   The target operating point setting means, based on a torque command value and a motor rotational speed, a minimum required voltage calculating means for calculating a minimum required voltage required by the generator to output the target output power, A stable limit voltage calculating means for calculating a stable limit voltage at which the generator can stably output the target output power based on the generator rotational speed, and the minimum required voltage and the stable limit voltage 10. The vehicle drive control device according to claim 9, wherein the target operating point is set based on a larger voltage value.   The generator output control means controls the field of the generator so that the output voltage of the generator becomes the voltage of the target operating point. The vehicle drive control device described.   The generator output control means is configured such that a current generator output characteristic line including an operating point determined from the output voltage and output current of the generator becomes a target generator output characteristic line including the target operating point. The vehicle drive control device according to any one of claims 9 to 12, wherein a field of the generator is controlled.   The generator output characteristic line is a linear line, and the generator output control means is configured so that the intercept of the current generator output characteristic line becomes an intercept of the target generator output characteristic line. The vehicle drive control device according to claim 14, wherein the field control is performed.   16. The target output power calculation means sets an upper limit on the target output power by a power limit value corresponding to an upper limit of a transmittable torque of a belt that drives the generator. The vehicle drive control device according to claim 1.   The target output power calculation means provides an upper limit to the target output power by a power limit value that prevents drivability deterioration due to excessive load of the internal combustion engine. Vehicle drive control apparatus.

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