JP2006226434A - Slip detection device and slip prevention device of winding drive system for generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly detect slip of a generator driving belt, thereby avoiding such a disadvantage that unnecessary slip prevention is performed or that required slip prevention is not performed. <P>SOLUTION: A ripple cycle T of generated voltage V of a three-phase generator is measured in S11 to S14. In S15, the number of revolutions of the generator is presumed based on the ripple cycle T and it is checked whether a slip ratio of the generator driving belt is within a predetermined range or not, by comparing the number of revolutions of the generator with that of an engine. In the case where the slip ratio of the generator driving belt is over the predetermined range, when it is judged in S16 that the ripple height of the generated voltage V is equal to or more than a set value (at which the generated voltage may bring the belt into a slipping state) and also when it is judged in S17 that the slip judgement in S15 has continued for a certain period of time or more, it is judged in S18 that the belt is in a slipping state such that the durability of the belt is deteriorated. At the time of the judgement, the generation load is decreased to prevent the slip of the belt. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  According to the present invention, a flexible body of a generator winding drive system in which a generator is driven by power from a power source via a winding drive system in which a flexible body is wound between pulleys. The present invention relates to a slip detection device for a wrapping drive system for a generator that detects a slip state, and a slip prevention device for a wrapping drive system for a generator that uses this detection result to prevent the flexible body from slipping. Is.

The generator winding drive system as described above is used for driving a generator in an electric motor type four-wheel drive vehicle as described in Patent Document 1, for example.
The electric motor type four-wheel drive vehicle described in Patent Document 1 drives the front two wheels or the rear two wheels via an automatic transmission by power from the engine, and the rear two wheels or the front two wheels are driven by the engine. It is driven by power from an electric motor that responds to the power generated by the generator.

  In brief, the engine drive wheels are likely to drive slip, or the surplus torque of the engine when the drive slips, the generator is loaded to generate power, and the electric motor is driven by this generated power. The motor 4 wheel drive is enabled by transmitting the power to the electric motor drive wheels.

By the way, since the generator drive system between the engine and the generator is configured by a winding drive system in which a flexible body such as a belt is wound between pulleys, the flexibility of the belt or the like is caused by an excessive power generation load. The body may be in a slip state exceeding the steady slip with respect to the pulley.
If the generator is continuously driven in this slip state, there arises a problem that the service life of the flexible body is remarkably shortened.

Therefore, conventionally, for example, as described in Patent Document 1, the generated power of the generator is determined by the belt driving torque and the generator rotational speed, and therefore the belt driving torque is determined based on the measured data. The belt drive torque is estimated from the engine speed (generator speed) and the generated power based on the fact that it can be estimated from the number (the value obtained by multiplying the engine speed by the pulley ratio). When the above set torque for determining whether or not to generate the slip state is greater than or equal to the set torque, it is determined that the belt is in a slip state exceeding the steady slip with respect to the pulley, and this slip state is prevented. Technology has been proposed.
JP 2003-193877 A

However, in the slip detection technology in the conventional generator winding drive system as described above, the belt drive torque is estimated from the generated power and the engine speed (generator speed) based on the measured data, In order to determine whether or not the belt slips based on the above, the following problem arises.
In other words, due to individual differences in generators and belts, and changes in these characteristics over time, when the above measured data is different from the actual one, the estimated value of the belt driving torque is different from the actual belt driving torque, There is a possibility that it is determined that the belt is in a slip state even if the belt is not in a slip state, or that the belt is not in a slip state even though the belt is already in a slip state.

If the former false detection is performed, unnecessary slip prevention control is executed, resulting in a shortage of generated power.If the latter false detection is performed, the necessary slip prevention control is not executed and the belt is not executed. In any case, it is not preferable.
Assuming that the estimated value of the belt drive torque is different from the actual belt drive torque, even if the set value for determining the slip of the belt drive torque is set with a margin, the erroneous detection of the belt slip state It is not useful for solving the problem and cannot solve the above problem.

The present invention can accurately estimate the rotational speed of the generator by calculation from the generation voltage change period of the generator, accurately detect the rotational speed of the power source that drives the generator, and Since there is a predetermined relationship determined by the transmission ratio of the generator winding drive system between the generator rotational speed and the power source rotational speed unless the flexible body is in a slip state,
A slip state is determined when the generator rotational speed estimated as described above and the power source rotational speed detected as described above no longer have a predetermined relationship determined by the transmission ratio of the generator winding drive system. Based on the fact that
An object of the present invention is to propose a slip detection device for a wrapping drive system for a generator that embodies this idea and prevents the above-described erroneous detection.

  A further object of the present invention is to propose an anti-slip device when a slip state of a winding drive system for a generator is detected using the above-described device.

For the former purpose, a slip detection device for a wrapping drive system for a generator according to the present invention is as described in claim 1,
A flexible body of a generator winding drive system in which a generator is driven by power from a power source via a winding drive system in which a flexible body is wound between pulleys is slipped with respect to the pulley. In the slip detection device of the winding drive system for the generator for detecting
The ratio of the generator rotational speed estimated from the change period of the voltage generated by the generator and the rotational speed of the power source deviates from the transmission ratio between the generator and the power source by a predetermined amount or more. The flexible body is configured to be determined to be in a slip state.

Further, for the latter purpose, the anti-slip device of the wrapping drive system for a generator according to the present invention is as described in claim 6,
When the slip detection device determines the slip state of the flexible body,
It is characterized in that the slip state of the flexible body is eliminated by reducing or reducing the power generation load of the generator to zero.

According to the former slip driving device of the winding drive system for the generator according to the present invention,
The ratio of the generator rotational speed estimated from the change period of the voltage generated by the generator and the rotational speed of the power source deviates from the transmission ratio between the generator and the power source by a predetermined amount or more. Since it is determined that the flexible body is in the slip state, the following effects can be obtained.

In other words, since the generator rotation speed is estimated from the change cycle of the generated voltage, the estimated value of the generator rotation speed is accurate regardless of product variations and changes over time, and matches the actual value well. The number of revolutions can also be detected directly and matches the actual value regardless of product variations or changes over time.
The determination result for determining that the flexible body is in a slip state when the ratio between the generator rotational speed and the power source rotational speed deviates by more than a predetermined value from the transmission ratio between the generator and the power source is also accurate. Thus, the erroneous detection of the slip state does not occur.

Further, according to the latter anti-slip device of the winding drive system for the generator according to the present invention,
When the slip detection device according to the present invention detects the slip state of the flexible body, by reducing the power generation load of the generator or zero, the slip state of the flexible body is eliminated.
To avoid a situation where power generation load shortage (including 0) control for unnecessary slip prevention is not executed due to the above-mentioned fact that no erroneous detection of a slip state occurs, resulting in a shortage of generated power. In addition, it is possible to solve the problem of reducing the life of the flexible body without executing the necessary slip load reduction (including zero) control for preventing slipping.

Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings.
FIG. 1 schematically shows a drive system of an electric motor type four-wheel drive vehicle including a slip detection device and a slip prevention device for a wrapping drive system for a generator according to an embodiment of the present invention,
In this embodiment, this vehicle is a front engine / front wheel drive vehicle (F / F vehicle) in which the left and right front wheels 1L and 1R are driven by the engine (internal combustion engine) 2 and the left and right rear wheels 3L and 3R are necessary. Accordingly, the vehicle is a so-called motor four-wheel drive vehicle that can be driven by the rear wheel drive motor 4 that is an electric motor.

  The engine 2 is drive-coupled to the left and right front wheels (main drive wheels) 1L and 1R via a transaxle in which an automatic transmission 5 and a differential gear device 6 enabling a continuously variable transmission are formed as an integral unit. It is assumed that torque is transmitted to the left and right front wheels 1L and 1R via the automatic transmission 5 and the differential gear device 6 and used for traveling of the vehicle.

Next, the rear wheel drive system by the electric motor 4 will be described.
A dedicated generator 10 driven by a part of the output torque of the engine 2 is provided via a winding drive system 9 constructed by wrapping an endless belt 7 as a flexible body between a pair of pulleys 7. 10 is a three-phase AC generator configured by a three-phase power generation coil 10a, a field coil 10b, and a three-phase bridge circuit 10c.
The generator 10 is rotated by the generator coil 10a at a rotational speed obtained by multiplying the rotational speed of the engine 2 by the belt pulley ratio (the transmission ratio of the winding drive system 9 for the generator), and is driven four-wheeled using the battery 11 as a power source. It is assumed that a power generation load corresponding to the field current Ifh applied to the field coil 10b adjusted by the controller 12 is applied to the engine 2 and power corresponding to the load torque is generated.

The power generation coil 10a of each phase generates a sinusoidal voltage Vc as illustrated in FIG. 2, and the three-phase bridge circuit 10c performs full-wave rectification on the three-phase AC power generation coil voltage Vc as shown in FIG. A voltage V including ripples is generated, and the ripple voltage V is output as the generated voltage of the generator 10.
Six ripples of the generated voltage V are generated per one rotation of the generator 10 (one rotation cycle is indicated by To in FIG. 2) because the power generation coil 10a is connected with an electrical angle shifted by 120 degrees.

In this embodiment, the generated voltage V including the above ripple is sequentially passed through the differentiating circuit 31 and the rising edge detecting circuit 32 shown in FIG. 3A, and the ripple period T (see also FIG. 2) is measured. Make it possible.
When the generated voltage V is passed through the differentiating circuit 31, a differential output Vb as shown in FIG. 3 (b) is obtained. When this differential output Vb is passed through the rising edge detection circuit 32, it is generated every time the differential output Vb rises. A trigger output Vp having a one-shot pulse waveform as shown in FIG. 3B is obtained, and the rising period of the trigger output Vp represents the ripple period T.

The electric power generated by the generator 10 is supplied to the rear wheel drive motor 4 through the power line 15 under the control of the inverter 14.
The inverter 14 responds to the command from the controller 12 to determine the motor torque by adjusting the power to the motor 4 and to switch the energization direction to determine the rotation direction of the motor 4, and the generator 10 becomes poorly controlled. Sometimes, even when the power line 15 is interrupted or the rear wheel drive is unnecessary and the controller 12 does not apply a power generation load to the generator 10, there is some power generation by the permanent magnet so that it is not supplied to the motor 4. Therefore, the power line 15 is cut off.

  The drive shaft of the rear wheel drive motor 4 is coupled to the differential gear device 17 of the rear wheels 3L and 3R via a speed reducer 16 and a clutch (not shown) incorporated therein, and the output torque of the motor 4 is reduced by the speed reducer 16. If the gear ratio is increased and the clutch is engaged by the controller 12, the increased torque is distributed and output to the left and right rear wheels 3L, 3R by the differential gear device 17.

The four-wheel drive controller 12 has a four-wheel drive controller 12 for controlling the rotation direction / drive torque of the motor 4 via the inverter 14, the field current (Ifh) control of the generator 10, and the clutch engagement / release control. In addition to inputting the signal from the four-wheel drive switch 21,
A signal from a wheel speed sensor group 22 for individually detecting the wheel speed (front wheel speed) of the left and right front wheels 1L, 1R and the wheel speed (rear wheel speed) of the left and right rear wheels 3L, 3R;
A signal from the accelerator opening sensor 23 for detecting the accelerator pedal depression amount APO is input.

  The four-wheel drive controller 12 determines whether the four-wheel drive is necessary while the driver turns on the four-wheel drive switch 21 and automatically performs the four-wheel drive motor described above. While the switch 21 is OFF, the two-wheel drive by only the engine drive of the front two wheels is continuously performed.

The four-wheel drive controller 12 not only performs the normal four-wheel drive control described above, but also detects the slip state of the generator drive belt 8 targeted by the present invention, and at the time of detection detects the slip of the generator drive belt 8 In order to perform control to prevent
The engine controller 24 that controls the engine 2 receives a signal about the engine speed Ne and a signal from the voltage sensor 25 that detects the generated voltage V of the generator 10.

The four-wheel drive controller 12 executes the control program shown in FIGS. 4 and 5 based on the input information, detects the slip state of the generator drive belt 8, and determines the generator drive belt 8 based on the detection result. Anti-slip control is performed.
In step S10 of FIG. 4, it is determined whether or not the generator drive belt 8 is in a slip state with respect to the pulley 7. If it is in the slip state, the field current to the coil 10b of the generator 10 is determined in step S20. Ifh is reduced or set to 0, the power generation load of the generator 10 is reduced or set to 0.
Such a decrease in power generation load (including 0) reduces the drive torque of the generator 10 and can prevent the generator drive belt 8 from slipping with respect to the pulley 7.

The slip determination of the generator drive belt 8 executed in step S10 is performed by the control program of FIG.
First, in step S11, it is checked whether or not the trigger output Vp having the one-shot pulse waveform shown in FIG. 3B has been generated, and the control is returned to the original state until the trigger output Vp is generated. Whenever it occurs, the control proceeds to step S12, and the slip determination of the generator drive belt 8 is performed as follows.

In step S12, the timer for measuring the ripple period T of the generated voltage V shown in FIGS. 2 and 3 (b) is stopped. In step S13, the timer value T at this time is read. In step S14, the timer value T Reset to 0 and restart.
Accordingly, the timer is the time from when the trigger output Vp was previously set to 0 in step S14 until it is stopped in step S12 due to the current trigger output Vp, that is, the trigger output Vp generation interval ( As described above, the ripple cycle T) of the generated voltage V is measured, and this timer value T is read in step S13.

In step S15, whether or not the belt 8 is slipping is determined as follows based on the ripple period T of the generated voltage V measured as described above. When the pulley transmission ratio of the multiplying drive system 9 is k, the generator rotational speed Nh is expressed by the following equation.
Nh ＝ k ・ Ne ・ ・ ・ （1）
On the other hand, ripples of the generated voltage V are generated as shown in FIG. 2 for one rotation of the generator 10 because the generator coil 10a is connected with an electrical angle shifted by 120 degrees, as shown in FIG. Is 6 times (6T) of the ripple period T (see FIGS. 2 and 3), and if the belt 8 does not slip with respect to the pulley 7, the relationship of the following equation is established.
6 ・ T ＝ 1 / Nh ＝ 1 / (k ・ Ne) ・ ・ ・ （2）
When the belt 8 slips with respect to the pulley 7, the relationship of the above equation (2) does not hold, so the ripple cycle T (generator speed 6 · T) of the generator 10 is compared with the engine speed Ne. By doing so, it can be determined whether or not the belt 8 is slipping with respect to the pulley 7.

However, the relationship between the generator rotational speed Nh and the engine rotational speed Ne is about a few percent difference from the above relationship due to the expansion and contraction of the belt 8 and the movement of the belt tensioner even in the steady state. The ripple period T of V has a relationship represented by the following expression with respect to the engine speed Ne.
6 ・ T ≧ 1 / (k ・ Ne) ・ ・ ・ (3)
Therefore, when belt slip is detected from the ripple cycle T of the generated voltage V, an upper limit is set for the ripple voltage cycle T, and it is determined that the belt slip has exceeded the pulley 7 by determining that the belt slip has been exceeded.

For the range considered normal, assuming that the upper limit value is 1 (1 + 1) · 1 / (k · Ne),
(1 + 1) · 1 / (k · Ne) ≧ 6 · T ≧ 1 / (k · Ne) (4)
If there is a ripple period T within the range satisfying the above condition, it is determined that the belt 8 does not slip with respect to the pulley 7.

  If it is determined in step S15 that the slip rate of the belt 8 is within the predetermined range and the belt 8 is not slipping with respect to the pulley 7, the control is terminated as it is, but the slip rate of the belt 8 is out of the predetermined range in step S15. When it is determined that the belt 8 is slipping with respect to the pulley 7, the control is sequentially advanced to step S16 to step S18 to determine whether or not the belt 8 is slipping continuously.

In step S16, it is checked whether or not the ripple height of the generated voltage V is less than a set value. Here, the ripple height of the generated voltage V increases as indicated by Vr in FIG. 6 (a) when the generated voltage V is high, and decreases as indicated by Vr ′ in FIG. 6 (b) when the generated voltage V is low.
The case where the power generation voltage V is increased corresponds to the case where the motor 4 is set to high output and high rotation. In this case, the generator voltage V is increased to prevent the motor current from decreasing due to the induced voltage of the motor. ing.

Further, in such a state where the generated voltage V is increased and the generated power is increased, the driving force of the generator 10 is increased and the torque applied to the generator drive belt 8 is also increased.
To explain this in detail, the generated power = efficiency × generator driving torque (ie, belt driving torque) × generator speed Nh, but between the engine speed Ne and the generator speed Nh, When the belt 8 is not slipped, there is a fixed relationship determined by the pulley transmission ratio of the winding drive system 9, and the generator rotational speed Nh is uniquely determined by this pulley transmission ratio and the engine rotational speed Ne. In order to increase the generated power as described above, it is necessary to increase the generator driving torque (belt driving torque), and the possibility that the belt 8 will slip increases.

Therefore, when it is determined in step S16 that the ripple height of the generated voltage V is less than the set value as indicated by Vr 'in FIG. 6B, that is, when the generated voltage V is low, the belt 8 can slip. Since the control is low, the control is terminated as it is, and the belt slip state is not detected.
By the way, when it is determined in step S16 that the ripple height of the generated voltage V is greater than the set value as indicated by Vr in FIG. 6A, that is, when the generated voltage V is high, the belt 8 may slip. Therefore, the control advances to step S17 to detect the belt slip state.

In step S17, it is checked whether or not the state in which it is determined in step S15 that belt slip has occurred has continued for a set time or more,
If the engine speed Ne does not continue, the engine speed Ne changes temporarily. For example, a transient temporary change caused by a sudden deceleration or acceleration of the vehicle, an upshift of the automatic transmission 5, or a downshift. Because it is a belt slip,
The control is terminated as it is, and it is not determined that the belt 8 is in the slip state.

  The same effect as this is that a transient temporary belt slip occurs due to the sudden change obtained from the engine speed Ne or a shift signal from a transmission controller (not shown) that controls the shift control of the automatic transmission 5. Needless to say, it is possible to determine the driving situation to be performed and to obtain the same result even if step S17 ends the control as it is.

  In step S17, if it is determined in step S15 that the state of occurrence of belt slip has continued for a set time or more, the reason is that the generator driving force is large, not the transient temporary belt slip described above. Since the belt 8 is in a belt slip state in which the belt 8 is continuously slipping with respect to the pulley 7, the control is terminated after determining the belt slip state in step S18.

When it is determined in step S18 that the belt is slipping, step S10 in FIG. 4 advances control to step S20, where the field current Ifh to the coil 10b of the generator 10 is reduced or set to zero. The power generation load of the generator 10 is reduced or reduced to zero.
Such a decrease in power generation load (including 0) reduces the drive torque of the generator 10 and can prevent the generator drive belt 8 from slipping with respect to the pulley 7.

  In the above embodiment, when estimating the generator rotation speed Nh from the change cycle of the voltage generated by the generator 10, the generated voltage having ripples obtained by full-wave rectification of the generator coil voltage Vc of each phase. Although it was decided to estimate the generator rotation speed Nh from the ripple period T of V, in this case, although it is not necessary to change the generator 10, a circuit for full-wave rectification of the generator coil voltage Vc is required, An edge trigger circuit as shown in FIG. 3 (a) is required, resulting in a cost penalty.

  In order to avoid such cost disadvantages, instead of the voltage sensor 25 in FIG. 1, a voltage sensor 26 for detecting an arbitrary one-phase power generation coil voltage Vc in the power generation coil 10a as shown in FIG. The generator rotational speed Nh can be estimated from the detected one-phase power generation coil voltage Vc.

In this estimation, since the one-phase generator coil voltage Vc becomes zero potential twice per rotation of the generator 10, as shown in FIG. 2, the time interval at which this zero potential is crossed, that is, the generator coil The zero-cross cycle To / 2 (see Fig. 2) of the voltage Vc is measured, and the relationship expressed by the following equation between this zero-cross cycle To / 2 and the engine speed Ne
2 ・ (To / 2) = 1 / Nh = 1 / (k ・ Ne)
Can be used to accurately estimate the generator rotational speed Nh.

It goes without saying that either a zero cross cycle from the negative side to the positive side or a zero cross cycle from the positive side to the negative side may be used.
And when measuring the zero-cross cycle as described above, since the measurement can be performed with the same accuracy regardless of the height of the generated voltage, the generator rotational speed Nh is accurately estimated regardless of the generated voltage. Based on the above, the slip state of the belt 8 can be detected with high accuracy by the same processing as in the above-described embodiment.

Incidentally, in any of the above-described embodiments, the ratio between the generator rotational speed Nh estimated from the change period of the voltage generated by the generator 10 and the engine 2 rotational speed Ne is between the generator 10 and the engine 2. Since it is determined that the baltic 8 is in a slip state when it is deviated from the transmission ratio k by a predetermined amount or more, the following effects can be obtained.
In other words, since the generator rotation speed Nh is estimated from the change cycle of the generated voltage, the estimated value of the generator rotation speed Nh is accurate regardless of product variations and changes over time, and matches the actual value well. The rotational speed Ne can also be detected directly and matches the actual value regardless of product variations and changes over time.
When the ratio between the generator rotational speed Nh and the engine rotational speed Ne deviates from the transmission ratio between the generator 10 and the engine 2 by a predetermined value or more, a determination result for determining that the flexible body is in a slip state is also provided. It is accurate and does not cause false detection of the slip state.

In addition, when the slip state of the belt 8 is detected as described above, the slip state of the belt 8 is eliminated by reducing the power generation load of the generator 10 to 0.
To avoid a situation where power generation load shortage (including 0) control for unnecessary slip prevention is not executed due to the above-mentioned fact that no erroneous detection of a slip state occurs, resulting in a shortage of generated power. In addition, it is possible to solve the problem that the required power generation load reduction (including zero) control for preventing slippage is not executed and the life of the belt is reduced.

When estimating the generator rotation speed Nh from the change cycle of the voltage generated by the generator 10,
The former of estimating the generator rotation speed Nh from the change period T of the ripple voltage (generated voltage of the generator 10) V obtained by rectifying the generator coil voltage (sine wave voltage) Vc of each phase generated by the generator 10 In the example,
As shown in FIG. 1, a voltage sensor 25 for detecting the ripple voltage (the generated voltage of the generator 10) V can be added to the outside of the generator 10, and there is an advantage that no modification of the generator 10 is required.

On the other hand, when estimating the generator rotational speed Nh from the change cycle of the voltage generated by the generator 10,
In the latter embodiment in which the generator rotational speed Nh is estimated from the zero-cross cycle To / 2 (see FIG. 2) related to the generator coil voltage (sine wave voltage) Vc in any one phase of the generator 10,
A circuit for full-wave rectifying the generator coil voltage Vc is unnecessary, and an edge trigger circuit as shown in FIG.
The zero-cross cycle To / 2 (see Fig. 2) of the generator coil voltage (sine wave voltage) Vc can be measured with the same accuracy regardless of the level of the generator voltage, and the generator speed Nh can be accurately measured regardless of the generator voltage. Based on this estimation, the slip state of the belt 8 can be detected with high accuracy.

In addition, since the ripple height of the generated voltage V is equal to or higher than the set value (step S16), the slip determination of the belt 8 is performed.
As described above with reference to FIG. 6, the belt 8 slip state detection action is performed only when the power generation voltage is high and the belt 8 may slip.
Even if the power generation voltage is low and there is no possibility that the belt 8 will be in the slip state, it is possible to avoid the foolishness that the slip state detection action of the belt 8 is performed.

Further, when the ratio between the estimated generator rotational speed Nh and the engine rotational speed Ne deviates more than a predetermined value from the transmission ratio between the generator 10 and the engine 2 continues for a set time or more. (Step S17), in order to determine that the belt 8 is in the slip state,
A belt slip in which the belt 8 temporarily slips transiently due to a sudden sudden change in the engine speed caused by a sudden deceleration or acceleration of the vehicle or an upshift or downshift of the automatic transmission is mistaken as a belt slip state. Although it is not detected and it is unnecessary in such a case, it is possible to avoid a situation in which the generated power is insufficient due to the belt slip prevention action that reduces the power generation load.

It is a basic diagram which shows the drive control system of the electric motor type four-wheel drive vehicle provided with the slip detection apparatus of the winding drive system for generators which becomes one Example of this invention. It is a wave form diagram about the ripple (electric power generation) voltage calculated | required by carrying out full wave rectification of the generator coil voltage of the generator in the same electric motor type four-wheel drive vehicle. (A) is a block diagram showing an edge trigger circuit for obtaining a trigger output from the ripple (power generation) voltage, based on the ripple (power generation) voltage. b) is a waveform diagram showing the ripple (power generation) voltage and the output of each part in the edge trigger circuit. 2 is a flowchart showing a belt slip prevention control program executed by a four-wheel drive controller in the drive control system of the electric motor type four-wheel drive vehicle shown in FIG. It is a flowchart which shows the subroutine regarding the belt slip state determination process in the belt slip prevention control program. Fig. 1 shows waveforms related to the generator coil voltage after full-wave rectification of the generator in Fig. 1 and the ripple (generation) voltage obtained from this, (a) is a waveform diagram when the generated voltage is high, and (b) It is a wave form diagram when a voltage is low. FIG. 6 is an electric circuit diagram around a generator, showing another embodiment of the present invention.

Explanation of symbols

1L front left wheel
1R Right front wheel 2 Engine (power source)
3L left rear wheel
3R Right rear wheel 4 Rear wheel drive motor (electric motor)
5 Automatic transmission 6 Differential gear device 7 Pulley 8 Endless belt (flexible body)
9 Winding drive system for generator
10 Generator
11 Battery
12 Four-wheel drive controller
14 Inverter
15 Power line
16 Reducer
17 Differential gear unit
21 Four-wheel drive switch
22 Wheel speed sensors
23 Accelerator position sensor
24 Engine controller
25,26 Voltage sensor

Claims (6)

A flexible body of a generator winding drive system in which a generator is driven by power from a power source via a winding drive system in which a flexible body is wound between pulleys is slipped with respect to the pulley. In the slip detection device of the winding drive system for the generator for detecting
The ratio of the generator rotational speed estimated from the change cycle of the voltage generated by the generator and the rotational speed of the power source is deviated by a predetermined amount or more from the transmission ratio between the generator and the power source. A slip detection device for a winding drive system for a generator, wherein the flexible body is determined to be in a slip state. The slip detection device for a wrapping drive system for a generator according to claim 1, wherein the generator is a multiphase motor.
A slip detection device for a generator winding drive system configured to estimate the generator rotational speed from a change cycle of a ripple voltage obtained by rectifying a sine wave voltage of each phase generated by the generator. In the slip detection apparatus of the winding drive system for generators of Claim 2,
A slip detection device for a wrapping drive system for a generator configured to perform the slip determination only while the height of the ripple voltage is equal to or higher than a set value. In the slip detection apparatus of the winding drive system for generators of Claim 1,
A slip detection device for a generator winding drive system configured to estimate the generator rotational speed from a period during which a sine wave voltage generated by the generator becomes 0 and becomes 0 again. In the slip detection apparatus of the winding drive system for generators of any one of Claims 1-4,
When the ratio between the estimated generator speed and the power source speed has deviated by more than a predetermined amount from the transmission ratio between the power generator and the power source has continued for a set time or more, A slip detection device for a generator winding drive system configured to determine that the flexible body is in a slip state. When the slip detection device according to any one of claims 1 to 5 determines the slip state of the flexible body,
An anti-slip device for a wrapping drive system for a generator, wherein the generator is configured to eliminate the slip state of the flexible body by reducing or reducing the power generation load of the generator to zero.

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