JP7251127B2 - Hybrid vehicle drive control system - Google Patents

Description

The present disclosure relates to a hybrid vehicle drive control system.

Patent Document 1 discloses a drive control device for a hybrid vehicle that uses an engine and a drive motor as drive sources. Such a drive control device for a hybrid vehicle predicts recoverable energy generated by deceleration of the vehicle, and controls the driving of the drive motor so that the predicted energy is consumed before the deceleration point in the traveling direction of the vehicle. do.

Patent Document 2 discloses a drive control device for a hybrid vehicle that controls driving of a driving motor that obtains electric power from an engine and a battery that generate driving force for the vehicle. The hybrid vehicle drive control device refers to map information related to a planned travel route from the current location to the destination, and if there is a regenerative charging expected section in which regenerative charging can be expected to the destination, the regenerative charging expected section. It has a running mode control means for setting the motor running mode only by the drive motor.

JP 2007-168743 A JP 2015-168370 A

In the hybrid vehicle drive control device disclosed in Patent Document 1 and Patent Document 2, EV running cannot be continued when the charge amount of the driving battery falls below a predetermined value during EV running using a driving motor as a drive source.

In view of the circumstances described above, at least one embodiment of the present invention provides an EV running even if the charge amount of the drive battery falls below a predetermined value during EV running of a vehicle that uses a rotary electric motor having a motor function as a drive source. It is an object of the present invention to provide a drive control system for a hybrid vehicle capable of continuing

(1) A drive control system for a hybrid vehicle according to at least one embodiment of the present invention includes a charge amount management device capable of managing the charge amount of a drive battery, and charging the drive battery managed by the charge amount management device. Drive control that enables EV running of a vehicle driven by a rotating electric motor having a motor function when the amount of charge is greater than or equal to a predetermined value, and starts the engine when the amount of charge of the drive battery is below the predetermined value. and a charge amount recovery point extracting apparatus capable of extracting a charge amount recovery point ahead of the vehicle route where recovery of the charge amount of the drive battery is expected, wherein the drive control apparatus extracts the charge amount A control unit is included for lowering the predetermined value when the recovery point is extracted.

According to the above configuration (1), the predetermined value is lowered when a charge amount recovery point is extracted ahead on the route of the vehicle, so that the hybrid vehicle can increase the usable charge amount of the driving battery. , the EV driving distance is increased and the EV driving can be continued.

(2) In some embodiments, in the configuration of (1) above, the charge amount recovery point extracting device can extract a regeneration point at which energy regeneration can be expected by a rotating electric motor having a regeneration function, and the control unit reduces the predetermined value in accordance with the amount of charge that can be expected to recover the amount of charge of the drive battery by regenerating the energy when the point of recovery of the amount of charge is the point of regeneration.

With configuration (2) above, the control unit reduces the predetermined value in accordance with the amount of charge that can be expected to recover the charge amount of the drive battery through energy regeneration when the charge amount recovery point is the regeneration point. Therefore, for example, if the predetermined value is reduced so as to secure the amount of electric power required for EV travel from the current position to the point of regeneration, the hybrid vehicle will continue to operate in EV mode from the current position to the point of regeneration. You can continue running.

(3) In some embodiments, in the configuration of (2) above, the charge amount recovery point extracting device can extract a deceleration point regenerated by deceleration of the vehicle and a downhill point regenerated by downhill. and the control unit greatly reduces the predetermined value when the charge amount recovery point is the downhill point than when the point is the deceleration point.

According to the above configuration (3), the control unit reduces the predetermined value more significantly when the charge amount recovery point is a downhill point than when the point is a deceleration point. That is, since the amount of energy regenerated is greater when the charge amount recovery point is a downhill point than when the charge amount recovery point is a deceleration point, the control unit controls the predetermined value when the charge amount recovery point is a downhill point rather than when it is a deceleration point. is greatly reduced, the hybrid vehicle has an increased EV travelable distance when the charge amount recovery point is a downhill point.

(4) In some embodiments, in the above configuration (2) or (3), the charge amount recovery point extracting device can extract a point where a charging facility capable of charging the driving battery is installed. When the charge amount recovery point is a point where a charging facility capable of charging the driving battery is installed, the control unit increases the predetermined value more than when the charge amount recovery point is the regeneration point. Lower.

According to the above configuration (4), when the charge amount recovery point is the point where the charging facility is installed, the control unit reduces the predetermined value more than when the charge amount recovery point is the recovery point. That is, when the charge amount recovery point is the point where the charging facility is installed, the charge amount can be increased more than when the charge amount recovery point is the recovery point. When the charging facility is installed, the predetermined value is reduced more than when the charge amount recovery point is the regeneration point, so that the hybrid vehicle can perform more EV driving when the charge amount recovery point is the point where the charging facility is installed. Increases possible distance.

(5) In some embodiments, in the configuration of any one of (1) to (4) above, the drive control device may reduce the charge amount of the drive battery to the value before the predetermined value is reduced. It further includes a drive shaft torque setting changing unit that reduces the drive shaft torque corresponding to the accelerator opening below a set value when it is less than the set value.

According to the above configuration (5), the drive shaft torque setting change unit increases the drive shaft torque corresponding to the accelerator opening from the set value when the charge amount of the drive battery is lower than the value before the predetermined value is decreased. also lower. Therefore, the drive shaft torque (required output) corresponding to the degree of opening of the accelerator is decreased, and the acceleration G is decreased, so that the battery output can be decreased. Further, since the drive shaft torque (required output) with respect to the accelerator opening becomes small, starting of the engine can be suppressed.

(6) In some embodiments, in the configuration of any one of (1) to (5) above, even if the amount of charge of the driving battery falls below the value before the predetermined value is lowered, An EV traveling continuation switch for maintaining continuation of EV traveling is further provided, and the control unit controls the predetermined value when the EV traveling continuation switch is in an ON state and the charge amount recovery point is extracted. lower the

With configuration (6) above, the control unit reduces the predetermined value when the EV running continuation switch is in the ON state and the charge amount recovery point is extracted. Therefore, when the EV travel continuation switch is in the ON state and the charge amount recovery point is extracted, the EV travel of the vehicle can be continued even if the charge amount of the driving battery falls below the predetermined value.

(7) In some embodiments, in the configuration of any one of (1) to (6) above, when the charge amount recovery point is extracted, the control unit sets the predetermined value to engine start. Decrease the amount of charge above the required amount.

According to the above configuration (7), when the charge amount recovery point is extracted, the predetermined value is reduced to a charge amount exceeding the amount necessary for starting the engine. quantity is guaranteed. Therefore, it is possible to avoid a situation in which the engine cannot be started.

According to at least one embodiment of the present invention, the EV traveling distance is increased and EV traveling can be continued.

1 is a schematic plan view showing a configuration of a hybrid vehicle in which a hybrid vehicle drive control system according to some embodiments of the present invention is mounted; FIG. 1 is a block diagram schematically showing the configuration of a hybrid vehicle drive control system according to an embodiment of the present invention; FIG. 1 is a block diagram schematically showing the configuration of a hybrid vehicle drive control system according to an embodiment of the present invention; FIG. 1 is a block diagram schematically showing the configuration of a hybrid vehicle drive control system according to an embodiment of the present invention; FIG. FIG. 3 is a diagram conceptually showing the amount of charge of a drive battery; 1 is a diagram conceptually showing EV running of a hybrid vehicle; FIG. FIG. 2 is a diagram conceptually showing series running of a hybrid vehicle; FIG. 5 is a diagram showing drive shaft torque stored in association with accelerator opening; FIG. 5 is a flow chart schematically showing control contents of the drive control system of the hybrid vehicle shown in FIGS. 2 to 4; FIG. 4 is a flow chart schematically showing control contents of the drive control system for the hybrid vehicle according to the embodiment of the present invention; 4 is a flow chart schematically showing control contents of the drive control system for the hybrid vehicle according to the embodiment of the present invention; FIG. 5 is a diagram showing drive shaft torque stored in association with accelerator opening and drive shaft torque reduced below a set value; FIG. 4 is a flow chart schematically showing the control contents of the drive control system of the hybrid vehicle shown in FIG. 3; FIG. FIG. 5 is a flow chart schematically showing the control contents of the drive control system of the hybrid vehicle shown in FIG. 4; FIG.

Several embodiments of the present invention will now be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, and are merely illustrative examples. do not have.

A hybrid vehicle equipped with a drive control system for a hybrid vehicle according to some embodiments of the present invention is a vehicle having a rotary electric motor (driving motor 12) having an engine and a motor function as a drive source, plug-in hybrid vehicles (PHV, PHEV) that can be charged from a power source. Here, a drive control system for a hybrid vehicle installed in a plug-in hybrid vehicle (PHEV) will be described as an example, but the hybrid vehicle installed with the drive control system according to the present invention is limited to the plug-in hybrid vehicle (PHEV). It is not something that can be done.

FIG. 1 is a schematic plan view showing the configuration of a hybrid vehicle 10 equipped with hybrid vehicle drive control systems 1A to 1C according to some embodiments of the present invention.

As shown in FIG. 1, a hybrid vehicle 10 equipped with hybrid vehicle drive control systems 1A to 1C according to some embodiments of the present invention is driven by an engine 11 and a drive motor 12, and the engine 11. A generator 13, a drive battery 14 that supplies electric power to a generator 13, a drive motor 12 and the power generated by the generator 13, and a driving force generated by the engine 11 or the drive motor 12 for running. A device 15 and a transaxle 16 that transmits driving force generated by the engine 11 or the driving motor 12 to the traveling device 15 .

Further, the hybrid vehicle 10 equipped with the hybrid vehicle drive control systems 1A to 1C according to some embodiments of the present invention includes a fuel tank 17 for storing fuel to be supplied to the engine 11, a drive motor 12 and a motor control unit 18 for controlling the generator 13 and an engine control unit 19 for controlling the engine 11 (see FIGS. 2 to 4).

The hybrid vehicle 10 equipped with the hybrid vehicle drive control systems 1A to 1C according to some embodiments of the present invention is, for example, a four-wheel drive hybrid vehicle, and the drive motor 12 is a front motor 12F. and a rear motor 12R, and the transaxle 16 includes a front transaxle 16F and a rear axle 16R. The motor control unit 18 also includes a front motor control unit 18F and a rear motor control unit 18R.

2 to 4 are block diagrams schematically showing configurations of hybrid vehicle drive control systems 1A to 1C according to one embodiment of the present invention.

As shown in FIGS. 2 to 4, hybrid vehicle drive control systems 1A to 1C according to some embodiments of the present invention include a charge amount management device 2, a drive control device 3, and a charge amount recovery point extraction device 4. Prepare.

The charge amount management device 2 can manage the charge amount of the driving battery 14 . The charge amount management device 2 integrates, for example, output values from a current sensor (not shown) provided in the driving battery 14, and estimates the charging rate from the battery capacity and remaining capacity. 14 state of charge (hereinafter referred to as “SOC”) can be managed.

The drive control device 3 enables traveling using the drive motor 12 as a drive source when the charge amount of the drive battery 14 managed by the charge amount management device 2 is equal to or greater than a predetermined value. As shown in FIG. 5, when the charge level of the drive battery 14 is equal to or greater than a predetermined value, it means that the charge level of the drive battery 14 is within the normal use range, for example. When the drive battery 14 has a charge amount within the normal use range, it means that the drive battery 14 is within a charge range in which the drive battery 14 can be normally used, and is within a range in which charging and discharging are possible. As shown in FIG. 6A , during running using the driving motor 12 as a drive source (hereinafter referred to as “EV running”), the engine 11 is stopped and electric power is supplied from the driving battery 14 to the driving motor 12 .

Further, the drive control device 3 starts the engine 11 when the charge amount of the drive battery 14 is below a predetermined value. The case where the charge amount of the drive battery 14 is below the predetermined value is, for example, the case where the charge amount of the drive battery 14 is below the lower limit value of the normal use range. As shown in FIG. 5, the lower limit of the normal use range of the drive battery 14 is, for example, the amount of charge (Charge Sustaining SOC (hereinafter referred to as "CSSOC") set to keep the charge amount of the drive battery 14 constant. )). When the engine 11 is started, the electric power generated by the generator 13 is supplied to the drive motor 12 to enable the vehicle to travel using the drive motor 12 as a drive source. As shown in FIG. 6B, when the engine 11 is started, electric power generated by the generator 13 is supplied to the driving motor 12, and driving using the driving motor 12 as the driving source (hereinafter referred to as "series driving"), the engine 11 is operated, and electric power is supplied from the generator 13 to the driving motor 12 and the driving battery 14 .

In the drive control device 3, the drive shaft torque is stored in association with the depression amount (accelerator opening) of the accelerator pedal 5 (see FIG. 7), and the drive shaft torque (output) is determined by the depression amount of the accelerator pedal 5. be done. Therefore, when the drive shaft torque determined by the amount of depression of the accelerator pedal 5 cannot be output due to the amount of charge in the drive battery 14, the engine 11 is started to cover the drive shaft torque (output). That is, whether or not the engine 11 is started is determined by whether or not the remaining SOC is greater than or equal to CSSOC and also by the amount of depression of the accelerator pedal 5 (accelerator opening). It starts when output is disabled due to the amount of charge in the battery 14 (shifts from EV running to series running).

The charge amount recovery point extracting device 4 can extract a charge amount recovery point (hereinafter referred to as a "charge amount recovery point") ahead of the route of the hybrid vehicle 10 where recovery of the charge amount of the driving battery 14 can be expected. The charge amount recovery point extracting device 4 can, for example, guide the current position of the hybrid vehicle 10 and the route to the destination, and charge the driving battery 14 included in the route from the current position of the hybrid vehicle 10 to the destination. It is possible to extract a point where recovery of the amount (increase in the amount of charge) is expected.

The charge amount recovery point may be any point as long as the charge amount of the drive battery 14 is expected to be recovered. For example, a point where energy regeneration is expected by a rotary motor having a regeneration function (regeneration point) , and a point where a charging facility is installed and the driving battery 14 can be charged. A rotating electric motor having a regenerative function is the generator 13 . The rotating electric motor having a regenerative function may be the driving motor 12 having a regenerative function, or may be a motor generator in which a motor and a generator are integrated. Further, the rotary electric motor having the regenerative function and the rotary electric motor having the motor function may be the same. The regeneration point includes, for example, a point (deceleration point) at which energy regeneration is expected due to deceleration of the hybrid vehicle 10 and a point (downhill point) at which energy regeneration is expected due to downhill travel of the hybrid vehicle 10. . The deceleration point is, for example, a point at which the vehicle decelerates to stop according to a red light in front of the vehicle, a point at which the hybrid vehicle 10 decelerates to stop according to a road sign (for example, stop) in front of the vehicle, and a vehicle. A deceleration point is included for hybrid vehicle 10 to stop according to the traffic ahead.

The charge amount recovery point extraction device 4 is, for example, a car navigation device 41, and may be a combination of the car navigation device 41 and an in-vehicle camera .

Red lights in front of the vehicle, road signs in front of the vehicle, and traffic congestion in front of the vehicle can be identified based on images captured by the vehicle-mounted camera 42 in addition to the car navigation device 41, for example. , road signs in front of the vehicle, and traffic congestion in front of the vehicle, the point at which the vehicle decelerates to a stop is identified.

A point (downhill point) at which energy is expected to be regenerated by running downhill of the hybrid vehicle 10 can be specified by, for example, the difference in elevation included in the map information included in the car navigation device 41 .

The point where the charging facility is installed is the destination where the charging facility is installed, and includes, for example, the home, workplace, and charging station where the charging facility is installed.

As shown in FIGS. 2 to 4, the drive control device 3 includes a control section 33 in the hybrid vehicle drive control systems 1A to 1C according to some embodiments. The control unit 33 reduces the predetermined value when the charge amount recovery point extraction device 4 extracts the charge amount recovery point. As a result, the hybrid vehicle 10 can continue EV driving with an increased EV driving distance.

For example, when the charge amount recovery point is the regeneration point, the control unit 33 reduces the predetermined value according to the charge amount that can be expected to recover the charge amount of the drive battery 14 by energy regeneration. Therefore, for example, if the predetermined value is decreased so as to secure the amount of electric power necessary for EV traveling from the current position to the point of regeneration, the hybrid vehicle 10 will be able to travel from the current position to the point of regeneration. EV driving can be continued.

Further, the control unit 33, for example, greatly lowers the predetermined value when the charge amount recovery point is a downhill point than when the point is a deceleration point. That is, since the amount of energy regenerated is greater when the charge amount recovery point is a downhill point than when the charge amount recovery point is a deceleration point, the control unit 33 controls the predetermined value when the charge amount recovery point is a downhill point rather than when the charge amount recovery point is a deceleration point. is greatly reduced, the hybrid vehicle 10 has a longer EV travelable distance when the charge amount recovery point is a downhill point. For example, if the value obtained by lowering the predetermined value when the charge amount recovery point is the deceleration point is set as the first predetermined value, the first predetermined value is the value obtained by lowering the predetermined value when the charge amount recovery point is the downhill point. A second predetermined value smaller than the predetermined value is set (value before decreasing the predetermined value>first predetermined value>second predetermined value).

Further, for example, when the charge amount recovery point is the point where the charging facility is installed, the control unit 33 reduces the predetermined value more than when the charge amount recovery point is the recovery point. That is, when the charge amount recovery point is the point where the charging facility is installed, the charge amount can be increased more than when the charge amount recovery point is the recovery point. When the charge amount recovery point is the point where the charging facility is installed, the predetermined value is greatly reduced compared to when the charge amount recovery point is the point where the charging facility is installed. EV driving range is increased. For example, a third predetermined value smaller than the second predetermined value (second predetermined value>third predetermined value ).

As shown in FIGS. 2 to 4, in drive control systems 1A to 1C for hybrid vehicles according to some embodiments, the drive control device 3 includes a calculation section 31, a comparison section 32, and a control section 33. FIG.

The calculation unit 31 calculates the amount of charge of the drive battery 14 that can be used until emergency power generation is started, and the amount of power required for EV travel from the current position of the hybrid vehicle 10 to the point where the charge amount is recovered. It is calculable. The charge amount of the drive battery 14 for starting emergency power generation is the charge amount for starting power generation in order to ensure that the drive battery 14 is discharged. The amount of charge of the drive battery 14 for starting emergency power generation is the amount of charge with which the engine 11 can be started without depressing the accelerator pedal 5, and the amount of charge with which the engine 11 can be started even when the hybrid vehicle 10 is stopped. Therefore, the charge amount of the drive battery 14 for starting emergency power generation is smaller than that of the CSSOC (see FIG. 5), and when the charge amount of the drive battery 14 reaches the charge amount for starting emergency power generation, the engine 11 is started and driven. The operation of the engine 11 is continued until the charge amount of the battery 14 exceeds CSSOC.

The amount of charge of the drive battery 14 that can be used until the start of emergency power generation is the amount of charge of the drive battery 14 that can be used until the start of emergency power generation from the current charge amount of the drive battery 14 .

The amount of electric power required for EV travel from the current position of the hybrid vehicle 10 to the point at which the charge level is recovered can be calculated, for example, by multiplying the distance from the current position of the hybrid vehicle 10 to the point at which the charge level is recovered by the average power consumption. is.

The comparison unit 32 calculates the amount of charge of the drive battery 14 that can be used until the start of emergency power generation calculated by the calculation unit 31, and the current position of the vehicle calculated by the calculation unit 31 to the charge amount recovery point. It is possible to compare the distance required for EV traveling to.

The control unit 33 calculates the amount of charge of the drive battery 14 that can be used until the start of emergency power generation compared by the comparison unit 32, and the electric power necessary for EV traveling from the current position of the vehicle to the charge amount recovery point. If it exceeds the amount, lower the lower limit of the normal use range below the set value.

FIG. 8 is a diagram schematically showing control contents of the hybrid vehicle drive control systems 1A to 1C according to some embodiments shown in FIGS. 2 to 4. In FIG.

As shown in FIG. 8, in hybrid vehicle drive control systems 1A to 1C according to some embodiments of the present invention, first, a charge amount recovery point extracting device 4 extracts a charge amount recovery point (step S1). Next, the calculation unit 31 of the drive control device 3 determines the charge amount of the drive battery 14 that can be used until emergency power generation is started, and the amount of charge recovered from the current position of the hybrid vehicle 10 . The amount of electric power required for EV traveling until the vehicle is driven is calculated (steps S2 and S3).

Next, the comparison unit 32 of the drive control device 3 compares the charge amount of the drive battery 14 that can be used until emergency power generation is started calculated by the calculation unit 31 and the hybrid vehicle 10 calculated by the calculation unit 31. A comparison is made with the amount of power required for EV travel from the current position to the point where the amount of charge is recovered (step S4).

Next, the control unit 33 of the drive control device 3 determines that the amount of charge of the drive battery 14 that can be used until the start of emergency power generation compared by the comparison unit 32 changes from the current position of the hybrid vehicle 10 to the charge amount recovery point. If it exceeds the amount of electric power for EV travel until arrival (step S4: Yes), the lower limit value of the normal use range is lowered below the set value (step S5).

According to the drive control systems 1A to 1C for a hybrid vehicle according to several embodiments of the present invention described above, even if the charge amount of the drive battery 14 falls below the lower limit value (set value) of the normal use range, EV travel is not performed. can continue. Therefore, for example, if the lower limit value of the normal use range is lowered so as to secure the amount of electric power necessary for the EV running of the hybrid vehicle 10 from the current position of the hybrid vehicle 10 until it reaches the charge amount recovery point, The hybrid vehicle 10 can continue EV traveling from the current position of the hybrid vehicle 10 until it reaches the charge amount recovery point.

In the hybrid vehicle drive control systems 1A to 1C according to some embodiments of the present invention, the control unit 33 sets the lower limit of the normal use range to a set value when the charge recovery point is a point where energy regeneration is expected. Decrease to a charge amount (value) that is less than and greater than the charge amount that initiates emergency power generation.

As shown in FIG. 9, for example, when the charge recovery point is the energy recovery point due to deceleration of the hybrid vehicle 10 (step S51: Yes, step S52: Yes), the control unit 33 sets the lower limit of the normal use range. The charge amount (value) is lowered to a first charge amount (value) (see FIG. 5) that is smaller than the set value and larger than the charge amount for starting emergency power generation (step S53).

Therefore, for example, if the first charging amount is set so as to secure the amount of electric power necessary for EV traveling of hybrid vehicle 10 from the current position of hybrid vehicle 10 to the deceleration start position, hybrid vehicle 10 , the vehicle can continue EV running from the current position of the hybrid vehicle until it reaches the deceleration end position (stop position).

As shown in FIG. 9, for example, when the charge amount recovery point is the energy recovery point due to the downhill running of the hybrid vehicle 10 (step S51: Yes, step S52: No), The lower limit value is lowered to a second charge amount (value) (see FIG. 5) that is less than the first charge amount and greater than the charge amount for starting emergency power generation (step S54).

Therefore, for example, if the second charging amount is set so as to secure the amount of electric power necessary for the EV traveling of the hybrid vehicle 10 from the current position of the hybrid vehicle 10 to the entrance of the downhill, the hybrid vehicle 10 can continue EV driving of the vehicle from the current position of the hybrid vehicle 10 until it reaches the exit of the downhill.

As shown in FIG. 10 , in the hybrid vehicle drive control systems 1A to 1C according to some embodiments of the present invention, the control unit 33 controls the charging facility at the charge amount recovery point so that the drive battery 14 can be charged. is possible (step S55: Yes), the lower limit value of the normal use range is lowered to the charge amount (value) for starting emergency power generation (see FIG. 5) (step S56).

According to the hybrid vehicle drive control systems 1A to 1C according to several embodiments of the present invention described above, the hybrid vehicle 10 has a charging facility installed at the charge amount recovery point, and the drive battery 14 can be charged. EV traveling of the hybrid vehicle 10 can be continued from the current position of the hybrid vehicle 10 to the charge amount recovery point.

By the way, if the vehicle output is P _VOUT (kW), the motor efficiency is η, and the gear efficiency is ξ, the battery output P _BOUT (kW) can be expressed by Equation (1).

Assuming that driving force is F and vehicle speed is V (km/h), battery output P _BOUT (kW) can be expressed by Equation 2.

The battery output P _BOUT (kW) can be expressed by Equation 3, where M is the vehicle weight, G is the acceleration, R(N) is the running resistance, and g (m/s ² ) is the gravitational acceleration.

If μr is the rolling resistance and μa is the air resistance, the battery output P _BOUT (kW) can be expressed by Equation 4.

Therefore, the battery output P _BOUT (kW) can be expressed by Equation 5.

Therefore, by decreasing the acceleration G, the battery output can be decreased. Further, since the battery capacity is the product of battery output and time (battery capacity (kWh)=battery output (kW)×time (h)), the battery capacity can be suppressed by reducing the acceleration G. Further, in order to decrease the acceleration G, it is sufficient to decrease the drive shaft torque with respect to the degree of opening of the accelerator.

Hybrid vehicle drive control systems 1A to 1C according to some embodiments of the present invention reduce drive torque with respect to accelerator opening when the amount of charge in drive battery 14 is below the value before the predetermined value is reduced. Let The value of the charge level of the drive battery 14 before it drops below a predetermined value is, for example, the lower limit value (set value) of the normal use range of the charge level of the drive battery 14 .

As shown in FIG. 3 , in the hybrid vehicle drive control system 1</b>B according to some embodiments of the present invention, the drive control device 3 further includes a drive shaft torque setting changing section 34 . The drive shaft torque setting change unit 34 reduces the drive shaft torque corresponding to the accelerator opening below the set value when the charge amount of the drive battery 14 is below the value before the predetermined value is reduced. Therefore, for example, when it falls below the lower limit value (set value) of the normal use range, the drive shaft torque corresponding to the accelerator opening is made lower than the set value. For example, as shown in FIG. 11, the drive shaft torque corresponding to the accelerator opening is reduced to half of the drive shaft torque stored in association with the accelerator opening.

The drive shaft torque setting changing unit 34 receives a signal from a switch (not shown) that is pressed when the charge amount of the drive battery 14 falls below the value before the predetermined value is lowered. good too. That is, the drive shaft torque setting changing section may reduce the drive shaft torque corresponding to the accelerator opening below the set value when the switch signal is input.

FIG. 12 is a diagram schematically showing control contents of the hybrid vehicle drive control system 1B shown in FIG.

As shown in FIG. 12, in the hybrid vehicle drive control system 1B according to some embodiments of the present invention, it is determined whether or not the charge amount of the drive battery 14 is below the lower limit of the normal use range ( step S61). When the charge amount of the drive battery 14 is below the lower limit value (set value) of the normal use range, the drive shaft torque setting change unit 34 reduces the drive shaft torque corresponding to the accelerator opening below the set value (step S62).

According to the drive control system 1B for a hybrid vehicle according to several embodiments of the present invention described above, the drive shaft torque (required output) corresponding to the accelerator opening becomes small, and the acceleration G decreases, so the battery output is reduced. can be lowered, and the battery capacity can also be suppressed. In addition, since the drive shaft torque (required output) corresponding to the accelerator opening becomes smaller, normal drive shaft torque cannot be obtained unless the accelerator pedal 5 is depressed more than usual, but the starting of the engine 11 is suppressed. can.

As shown in FIG. 4, a drive control system 1C for a hybrid vehicle according to some embodiments of the present invention and an EV running continuation switch 6 are further provided. The EV driving continuation switch 6 is a switch for maintaining the continuation of EV driving even when the amount of charge in the driving battery 14 is below the value before the predetermined value is decreased. The value of the charge level of the drive battery 14 before it drops below the predetermined value is, for example, the lower limit value (set value) of the normal use range of the charge level of the drive battery 14 .

In the hybrid vehicle drive control system 1C according to some embodiments of the present invention, when the EV running continuation switch 6 is in the ON state and the charge amount recovery point is extracted, the control unit 33 lower the Therefore, for example, the control unit 33 determines that the EV driving continuation switch 6 is in the ON state and that the charging amount of the drive battery 14 that can be used until the start of emergency power generation compared by the comparing unit 32 is the current state of the vehicle. If the amount of electric power required for EV travel from the position to the charge amount recovery point is exceeded, the lower limit value of the normal use range is lowered.

FIG. 13 is a diagram schematically showing control contents of the hybrid vehicle drive control system 1C shown in FIG.

As shown in FIG. 13, in the hybrid vehicle drive control system 1C according to some embodiments of the present invention, the control unit 33 controls that the EV running continuation switch 6 is in the ON state (step S71: Yes), and the comparison If the charge amount of the driving battery 14 that can be used until the start of emergency power generation compared in the unit 32 exceeds the electric power required for EV traveling from the current position of the hybrid vehicle 10 to the charge amount recovery point ( If step S72: Yes), lower the lower limit of the normal use range (step S73).

According to the hybrid vehicle drive control system 1C according to some embodiments of the present invention described above, when the EV running continuation switch 6 is in the ON state, the driving battery 14 is charged during EV running of the hybrid vehicle. Even if the amount falls below the lower limit value (set value) of the normal use range, the EV running of the hybrid vehicle can be continued. Therefore, for example, if the lower limit value of the normal use range is lowered so as to secure the amount of electric power necessary for the EV running of the vehicle from the current position of the hybrid vehicle 10 to the charge amount recovery point, the hybrid vehicle 10 can continue the EV running of the vehicle from the current position of the hybrid vehicle 10 until it reaches the charge amount recovery point.

In the hybrid vehicle drive control systems 1A to 1C according to some embodiments of the present invention, when the charge amount recovery point is extracted, the control unit 33 sets the predetermined value to the amount of electric power required for starting the engine (charge amount ). The amount of electric power required to start the engine is, for example, a value smaller than the third predetermined value (the third predetermined value>the amount of electric power required to start the engine), and is set so that discharge from the battery is prohibited. It may be the amount of electric power. The amount of charge that exceeds the amount of electric power required to start the engine is, for example, the amount of charge of the driving battery 14 for starting the emergency power generation described above. Therefore, for example, when the charge amount recovery point is extracted, the lower limit value (set value) of the normal use range of the drive battery 14 is reduced to the charge amount of the drive battery 14 for starting emergency power generation. Since the amount of electric power required for starting the engine is smaller than the amount of charge in the drive battery 14 that initiates emergency power generation, and a difference is provided (the amount of charge in the drive battery 14 that initiates emergency power generation > engine start If the lower limit of the normal use range of the driving battery 14 is lowered to the amount of charge required to start emergency power generation when the power amount recovery point is extracted, the situation where the engine cannot be started can be prevented. You can avoid it more reliably.

According to the hybrid vehicle drive control systems 1A to 1C according to some embodiments of the present invention described above, when the charge amount recovery point is extracted, the charge amount exceeds the amount of electric power required to start the engine by the predetermined value. , so that the driving battery has sufficient charge to start the engine. Therefore, it is possible to avoid a situation in which the engine cannot be started.

The present invention is not limited to the above-described embodiments, and includes modifications of the above-described embodiments and modes in which these modes are combined as appropriate.

1A, 1B, 1C hybrid vehicle drive control system 2 charge amount management device 3 drive control device 31 calculation unit 32 comparison unit 33 control unit 34 drive shaft torque setting change unit 4 charge amount recovery point extraction device 41 car navigation device 42 vehicle-mounted camera 5 accelerator pedal 6 EV running continuation switch 10 hybrid vehicle 11 engine 12 drive motor 12F front motor 12R rear motor 13 generator 14 drive battery 15 travel device 16 transaxle 16F front transaxle 16R rear transaxle 17 fuel tank 18 motor control unit 18F Front motor control unit 18R Rear motor control unit 19 Engine control unit

Claims (6)

a charge amount management device capable of managing the charge amount of the driving battery;
When the charge amount of the drive battery managed by the charge amount management device is equal to or greater than a predetermined value, the vehicle can be driven in an EV mode using a rotating electric motor having a motor function as a drive source, and the charge amount of the drive battery is enabled. a drive control device that starts the engine when is below the predetermined value;
a charge amount recovery point extracting device capable of extracting a charge amount recovery point ahead on the route of the vehicle at which the charge amount of the driving battery is expected to be recovered;
an EV driving continuation switch for maintaining continuation of EV driving even when the amount of charge of the driving battery is below the predetermined value;
with
The drive control device is
A drive control system for a hybrid vehicle, comprising: a control unit that reduces the predetermined value when the EV drive continuation switch is in an ON state and the charge amount recovery point is extracted. The charge amount recovery point extracting device can extract a regeneration point where energy regeneration can be expected by a rotating electric motor having a regeneration function,
When the charge amount recovery point is the regeneration point, the control unit reduces the predetermined value in accordance with a charge amount that can be expected to recover the charge amount of the drive battery through regeneration of the energy. The drive control system for a hybrid vehicle according to claim 1. The charge amount recovery point extracting device is capable of extracting a deceleration point regenerated by deceleration of the vehicle and a downhill point regenerated by downhill,
The control unit
3. The drive control system for a hybrid vehicle according to claim 2, wherein the predetermined value is greatly reduced when the charge amount recovery point is the downhill point than when the point is the deceleration point. The charge amount recovery point extracting device can extract a point where a charging facility capable of charging a driving battery is installed,
The control unit
When the charge amount recovery point is a point where a charging facility capable of charging the driving battery is installed, the predetermined value is reduced more than when the charge amount recovery point is the regeneration point. A drive control system for a hybrid vehicle according to claim 2 or 3. The drive control device is
further comprising a drive shaft torque setting changing unit that reduces the drive shaft torque corresponding to the degree of opening of the accelerator below a set value when the charge amount of the drive battery falls below the value before the predetermined value is reduced. The hybrid vehicle drive control system according to any one of claims 1 to 4. The control unit
6. The hybrid vehicle according to any one of claims 1 to 5 , wherein the predetermined value is reduced to a charge amount exceeding an amount necessary for starting the engine when the charge amount recovery point is extracted. Drive control system.

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