JP5471635B2 - Brake generation system for vehicles - Google Patents

Description

  The present invention relates to a vehicular braking generation system, and more particularly to a vehicular braking system suitable for generating a braking torque for braking a vehicle using a driving motor and a braking electric brake disposed under a body spring. The present invention relates to a braking system.

  2. Description of the Related Art Conventionally, there is known a vehicle braking generation system in which a motor that generates a driving torque for driving a wheel under a body spring or an electric brake that generates a braking torque for braking a wheel is arranged (see, for example, Patent Document 1). . In such a system, a battery disposed on the vehicle body spring and a motor or an electric brake disposed below the vehicle body spring are electrically connected via a power line. The motor or the electric brake generates driving torque or braking torque by being supplied with electric power from the battery via the power line.

JP 2006-219082 A

  By the way, when both the motor and the electric brake are disposed under the body spring, both are electrically connected to the battery via separate power lines, and both are separately and independently supplied with power. Can be considered. However, in such a system, since it is necessary to route two types of power lines between the body spring and the body spring, there is a disadvantage that the configuration becomes complicated.

  The present invention has been made in view of the above points, and is a vehicle capable of reliably generating the braking torque required for the vehicle while realizing power supply to the motor and the electric brake with a simple configuration. An object of the present invention is to provide a braking generation system.

The above objects are placed under the body spring, thereby generating a driving torque for driving the wheels by a power supply, an electric motor generates regenerative power by the rotation of the wheels, placed under spring vehicle body, the wheel by a power supply An electric brake for generating a braking torque for braking the vehicle, a first power line through which electric power is exchanged between the battery and the electric motor arranged on the vehicle body spring, and the electric motor arranged under the vehicle body spring. The second power line through which the electric power supplied from the motor to the electric brake flows, and when braking of the vehicle is required, the required braking torque is generated by the regenerative braking torque accompanying the regeneration of the electric motor and the electric motor. Braking torque control means for generating the electric braking torque generated by the electric brake by supplying all or part of the regenerative power via the second power line. It is achieved by the braking generating system for a vehicle.

  In this aspect of the invention, the motor under the body spring is electrically connected to the battery on the body spring via the first power line, and the electric brake under the body spring is electrically connected to the motor under the body spring via the second power line. Connected. The required braking torque of the vehicle includes regenerative braking torque accompanying regeneration of the motor, and electric braking torque generated by the electric brake by supplying all or part of the regenerative power generated by the motor via the second power line. Is generated. In such a configuration, it is not necessary to route the power line for operating the electric brake from the upper side of the body spring, and the number of power lines connecting the upper side of the body spring and the lower side of the body spring can be minimized. The power supply to the motor and the electric brake can be realized with a simple configuration. In addition, if all or part of the regenerative power generated by the motor is supplied to the electric brake via the second power line, even when all of the required braking torque is not satisfied only by the regenerative braking torque accompanying the regeneration of the motor, Since the required braking torque can be supplemented by the electric braking torque generated by the electric brake, it is possible to reliably generate the required braking torque.

  In the above-described vehicle brake generation system, the braking torque control means distributes the regenerative braking torque and the electric braking torque that are predetermined for the maximum braking torque when braking of the vehicle is required. Based on the above, the regenerative braking torque may be generated with priority over the required braking torque.

  Further, in the above-described vehicle brake generation system, the braking torque control means is configured such that when the required braking torque is larger than the regenerative braking torque that is distributed in advance with respect to the maximum braking torque, a surplus required braking torque. May be generated by the electric braking torque.

  Further, in the above-described vehicle braking generation system, the braking torque control means is configured to determine the regenerative braking torque and the electric braking torque in advance with respect to the requested braking torque when braking of the vehicle is requested. It is good also as generating by a ratio.

Further, in the vehicle braking generating system described above, the allocation may be that a value which is changed in accordance with the vehicle speed.
In the above-described vehicle brake generation system, the predetermined ratio may be a value that is changed according to a vehicle speed.

  ADVANTAGE OF THE INVENTION According to this invention, the braking torque requested | required of a vehicle can be produced | generated reliably, implement | achieving the electric power supply to a motor and an electric brake with a simple structure.

1 is a configuration diagram of a vehicle brake generation system according to an embodiment of the present invention. FIG. 5 is a diagram illustrating an example of a map that defines a distribution between a regenerative braking torque to be generated by a motor and an electric braking torque to be generated by an electric brake with respect to a maximum braking torque in the present embodiment. It is a flowchart of an example of the control routine performed in the brake generation system for a vehicle of a present Example. In the modification of this invention, it is a figure which shows an example of the map which prescribed | regulated distribution with the regenerative braking torque which should be generated with a motor with respect to the maximum braking torque, and the electric braking torque which should be generated with an electric brake. In the modification of this invention, it is a figure for demonstrating the method of setting distribution of the regenerative braking torque which should be generated with a motor with respect to a request | requirement braking torque, and the electric braking torque which should be generated with an electric brake.

  Hereinafter, specific embodiments of a vehicle brake generation system according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration diagram of a vehicle brake generation system 10 according to an embodiment of the present invention. The vehicle brake generation system 10 of the present embodiment is a system that generates a braking torque applied to a vehicle.

  A vehicle equipped with the vehicle brake generation system 10 includes a motor 12 that generates a driving torque for driving the wheel corresponding to each wheel. The motor 12 is an in-wheel motor that is provided in a wheel 14 on which a wheel tire is mounted and is disposed under a body spring. The motor 12 is, for example, a three-phase AC synchronous motor or induction motor that is electrically connected to the battery 16 disposed on the body spring via the first power line 18. The first power line 18 is routed so as to connect the battery 16 on the vehicle body spring and the motor 12 below the vehicle body spring, and distributes electric power exchanged between the battery 16 and the motor 12.

  The motor 12 is an electric motor that rotates the wheel 14 by generating driving torque when electric power is supplied from the battery 16 via the first power line 18. A converter 20 and a first inverter 22 are provided on the first power line 18. A motor electronic control unit (motor ECU) 24 is electrically connected to the converter 20 and the first inverter 22. The converter 20, the first inverter 22, and the motor ECU 24 are disposed on the body spring.

  The converter 20 on the first power line 18 is a boost converter that boosts the voltage of the battery 16 and outputs the boosted voltage to the first inverter 22 side. The first inverter 22 has a function of converting a direct current from the battery 16 side into an alternating current and supplying the alternating current to the motor 12 side by being PWM driven by a command from the motor ECU 24. When the driving of the wheel is required, the motor ECU 24 PWM-drives the first inverter 22 so that the motor 12 generates a driving torque corresponding to the request. The motor 12 generates a driving torque for driving the wheels when electric power according to the PWM driving of the first inverter 22 is supplied from the battery 16 side via the first power line 18.

  The motor 12 is also a generator that generates power by the power transmitted from the wheels when the vehicle is decelerated and generates regenerative power by the rotation of the wheels. The first inverter 22 also has a function of converting the alternating current generated by the motor 12 into a direct current and supplying it to the battery 16 side by being PWM driven by a command from the motor ECU 24. When the braking of the wheel is required, the motor ECU 24 PWM-drives the first inverter 22 so that the motor 12 generates a regenerative braking torque corresponding to the request. The converter 20 is a step-down converter that steps down the voltage from the first inverter 22 and outputs it to the battery 16 side. The battery 16 is charged by supplying regenerative power from the motor 12 side via the first power line 18 according to the PWM drive of the first inverter 22.

  The vehicular braking generation system 10 includes a brake 30 that generates braking torque that mechanically brakes wheels with the motor 12 that generates regenerative braking torque with regeneration. The brake 30 is provided corresponding to each wheel, and is disposed under the body spring. The brake 30 is a mechanical brake that includes a brake rotor that is attached and fixed to the wheel 14, a brake pad, and a caliper. The brake 30 is an electric brake that generates a braking torque that causes the carrier to actuate with supplied power to brake the wheel.

  The brake 30 is electrically connected to the motor 12 via the second power line 32. The second power line 32 is routed under the body spring and distributes the power supplied from the motor 12 to the brake 30. A second inverter 34 and a converter 36 are provided on the second power line 32. An electric brake electronic control unit (EMB-ECU) 38 is electrically connected to the second inverter 34 and the converter 36. The second inverter 34, the converter 36, and the EMB-ECU 38 are disposed under the body spring.

  The second inverter 34 has a function of converting the alternating current generated by the motor 12 into a direct current and supplying it to the brake 30 side by being PWM driven by a command from the EMB-ECU 38. When the braking of the wheel is required, the EMB-ECU 38 drives the second inverter 34 by PWM so that the brake 30 generates a braking torque that should be generated by the brake 30 in response to the braking request. The converter 36 is a step-down converter that steps down the voltage from the second inverter 34 and outputs it to the brake 30 side. The brake 30 operates when regenerative electric power according to the PWM drive of the second inverter 34 is supplied from the motor 12 side via the second power line 32, and generates braking torque that brakes the wheel.

  A braking control unit 40 disposed on the body spring is electrically connected to the motor ECU 24 on the body spring and the EMB-ECU 38 below the body spring. The braking control unit 40 is electrically connected to the EMB-ECU 38 via the control signal line 42. The control signal line 42 is arranged to connect the braking control unit 40 on the vehicle body spring and the EMB-ECU 38 below the vehicle body spring, and distributes the control signal supplied from the braking control unit 40 to the EMB-ECU 38. . The braking control unit 40 calculates the required braking torque required for the vehicle based on the amount of brake operation and the like, and detects the vehicle speed of the vehicle based on the wheel speed and the like.

  The braking control unit 40 stores in advance a map that defines the distribution of the regenerative braking torque to be generated by the motor 12 and the electric braking torque to be generated by the brake 30 with respect to the maximum braking torque. In this map, the distribution of the regenerative braking torque to be generated by the motor 12 and the electric braking torque to be generated by the brake 30 is changed according to the vehicle speed as shown in FIG. For example, when the vehicle speed is low, the ratio of the regenerative braking torque to be generated by the motor 12 is set to a relatively large value and the ratio of the electric braking torque to be generated by the brake 30 is set to a relatively small value, while the vehicle speed is high. The ratio of the regenerative braking torque to be generated by the motor 12 is set to a relatively small value, and the ratio of the electric braking torque to be generated by the brake 30 is set to a relatively large value.

  Next, with reference to FIG. 3, the control operation of the vehicle brake generation system 10 of the present embodiment will be described. FIG. 3 shows a flowchart of an example of a control routine executed by the brake control unit 40 in the vehicle brake generation system 10 of the present embodiment.

  In the vehicle brake generation system 10, the brake control unit 40 calculates the required braking torque Tre and detects the vehicle speed at that time (step 100). Based on the detected vehicle speed, the distribution of the regenerative braking torque Tsk and the electric braking torque Tsd with respect to the maximum braking torque to be realized at the detected vehicle speed is set by referring to the map (step 102).

  The braking control unit 40 compares the regenerative braking torque value Tsk with respect to the maximum braking torque in the distribution set as described above with the required braking torque Tre calculated as described above, and generates the regeneration to be generated by the motor 12. The braking torque Tk is set, and the electric braking torque Td to be generated by the brake 30 is set (step 104). Specifically, the regenerative braking torque Tk and the electric braking torque Td to be generated are set so that the regenerative braking torque by the motor 12 is generated with priority over the required braking torque Tre.

  For example, as shown in FIG. 2B, when the required braking torque Tre is equal to or less than the regenerative braking torque Tsk with respect to the maximum braking torque, the required braking torque Tre is generated only by the regenerative braking torque by the motor 12. A regenerative braking torque Tk to be generated is set (Tre = Tk). Further, when the required braking torque Tre exceeds the regenerative braking torque Tsk for the maximum braking torque, the required braking torque Tre is specifically generated by the regenerative braking torque by the motor 12 and the electric braking torque by the brake 30. The regenerative braking torque Tsk corresponding to the maximum braking torque is generated by the regenerative braking torque by the motor 12, and the remainder of the required braking torque Tre (= Tre−Tsk) is generated by the electric braking torque by the brake 30. Thus, the regenerative braking torque Tk (= Tsk) and the electric braking torque Td to be generated are set (Tre = Tk + Td).

  The braking control unit 40 supplies a command signal for causing the motor 12 to generate the regenerative braking torque Tk set as described above to the motor ECU 24 at the time of a braking request, and also supplies the brake 30 with the electric braking torque Td set as described above. A command signal to be generated is supplied to the EMB-ECU 38 via the control signal line 42 (step 106).

  When receiving an instruction from the braking control unit 40, the motor ECU 24 PWM-drives the first inverter 22 so that the regenerative braking torque Tk according to the instruction is generated. In this case, since the motor 12 is regenerated by the rotation of the wheel by PWM driving of the first inverter 22, a regenerative braking torque Tk that brakes the wheel while the regenerative power is generated by the motor 12 is generated.

  When the EMB-ECU 38 receives a command from the braking control unit 40, the EMB-ECU 38 drives the second inverter 34 by PWM so that the electric braking torque Td according to the command is generated. In this case, the second inverter 34 is PWM-driven, so that regenerative power generated by the motor 12 is allowed to be supplied to the brake 30 via the second power line 32. Electric braking torque Td for braking is generated.

  The regenerative power generated by the motor 12 is supplied to the brake 30 via the second power line 32 by an amount corresponding to the PWM drive of the second inverter 34. That is, all or part of the regenerative power generated by the motor 12 is supplied to the brake 30 via the second power line 32. For this reason, among the regenerative electric power generated by the motor 12, electric power necessary to generate the electric braking torque Td by the brake 30 is supplied to the brake 30 side via the second electric power line 32, while excess regenerative electric power is generated. The battery 16 is supplied via the first power line 18.

  Further, the brake 30 can generate a large electric braking torque with a relatively small electric power, and can generate a large electric braking torque even when the regenerative electric power generated by the motor 12 is small.

  As described above, in the vehicle braking generation system 10 of the present embodiment, the required braking torque of the vehicle is the second or all of the regenerative braking torque accompanying the regeneration of the motor 12 and the regenerative power generated by the motor 12. The electric braking torque generated by the brake 30 by being supplied via the power line 32 is generated.

  In such a configuration, the brake 30 under the vehicle body spring operates by receiving the regenerative power from the motor 12 under the vehicle body spring via the second power line 32. Therefore, the power line for operating the brake 30 is provided only under the vehicle body spring. It is enough to arrange the power line, and it is not necessary to arrange the power line from the upper side of the body spring. In this regard, only one power line connecting the upper side of the vehicle body spring and the lower side of the vehicle body spring may be provided between the battery 16 and the motor 12, and the number of the power lines can be minimized. In addition, the power supply to the brake 30 can be realized with a simple configuration.

  Further, since all or a part of the regenerative power generated along with the regeneration of the motor 12 is supplied to the brake 30 via the second power line 32, the braking torque required for the vehicle is regenerated along with the regeneration of the motor 12. Even when the braking torque alone is not satisfied, the remaining required braking torque can be supplemented with the electric braking torque by the brake 30. In this regard, it is possible to reliably generate the required braking torque of the vehicle.

  Therefore, according to the vehicle brake generation system 10 of the present embodiment, it is possible to reliably generate the braking torque required for the vehicle while realizing power supply to the motor 12 and the brake 30 with a simple configuration.

  In the present embodiment, the regenerative braking torque Tk and the electric braking torque Td to be generated are set so that the regenerative braking torque by the motor 12 is generated with priority over the required braking torque of the vehicle. The regenerative braking torque by the motor 12 is generated with priority over the required braking torque. For this reason, according to the present embodiment, since the amount of regenerative braking torque from the motor 12 collected in the battery 16 can be relatively increased, the charging efficiency of the battery 16 can be improved.

  In the above embodiment, the braking control unit 40, the motor ECU 24, and the EMB-ECU 38 correspond to “braking torque control means” described in the claims.

  By the way, in the above embodiment, the EMB-ECU 38 for controlling the electric braking torque generated by the brake 30 is disposed under the body spring, and the control signal line 42 connects the EMB-ECU 38 and the braking control unit 40 on the body spring. In addition, the distribution ratio between the regenerative braking torque and the electric braking torque that is determined in advance with respect to the maximum braking torque is set to a value that is changed according to the vehicle speed, but the present invention is limited to this. Instead, the distribution ratio may be a fixed value regardless of the vehicle speed as shown in FIG.

  In this modified example, the regenerative braking torque Tk and the electric braking torque Td to be generated are generated with priority given to the regenerative braking torque by the motor 12 over the required braking torque of the vehicle, as in the above-described embodiment. The distribution ratio between the regenerative braking torque and the electric braking torque is always fixed with respect to the required braking torque regardless of the value of the required braking torque of the vehicle. It is good to do. When the distribution ratio between the regenerative braking torque and the electric braking torque is always fixed with respect to the required braking torque, an inverter arranged on the second power line 32 connecting the motor 12 and the brake 30 is Any motor may be used as long as it is driven so that a regenerative current proportional to the amount of regenerative power generated by the motor 12 is distributed from the motor 12 side to the brake 30 side via the second power line 32. Since it is not necessary to set the electric braking torque to be generated by the brake 30 and to perform inverter driving according to the setting, the EMB- controls the electric braking torque to be generated by the brake 30 below the body spring. It is not necessary to arrange the ECU 38, and it is possible to simplify the configuration below the vehicle body spring.

  In the above embodiment, the regenerative braking torque is generated with priority over the required braking torque. However, the present invention is not limited to this, and the vehicle speed is set in advance with respect to the maximum braking torque. The distribution ratio (= Ksk: Ksd) between the regenerative braking torque and the electric braking torque determined in accordance with this is applied as it is to the distribution ratio between the regenerative braking torque and the electric braking torque to be generated (FIG. 5A and FIG. (See (B)), the distribution ratio (= Ksk: Ksd) of the regenerative braking torque and the electric braking torque according to the vehicle speed may be fixed regardless of the magnitude of the required braking torque.

  In the above embodiment, the brake 30 generates the electric braking torque Td set by the braking control unit 40 from the braking control unit 40 on the body spring to the EMB-ECU 38 below the body spring via the control signal line 42. The EMB-ECU 38 is supplied with a command signal for causing the EMB-ECU 38 to perform PWM driving of the second inverter 34 so as to generate the electric braking torque Td according to the command from the braking control unit 40. The EMB-ECU 38 under the vehicle body spring stores in advance a map that defines the electric braking torque corresponding to the vehicle speed to be generated by the brake 30 with respect to the maximum braking torque, and the vehicle body spring. The vehicle speed signal is input from the upper vehicle speed sensor, and then the EMB-ECU 38 , May be electric braking torque Td corresponding to the vehicle speed in accordance with the stored map to perform PWM driving of the second inverter 34 to generate. In this case, the braking control unit 40 may store in advance a map that defines the regenerative braking torque corresponding to the vehicle speed to be generated by the motor 12 with respect to the maximum braking torque.

  In this modification, the vehicle speed signal input to the EMB-ECU 38 is detected by the wheel speed attached to the motor 12 under the body spring instead of the signal output from the vehicle speed sensor provided on the body spring. It is also possible to use a resolver signal output from a resolver sensor. In this case, since the control signal line connecting the upper body spring and the lower body spring can be reduced, the configuration of the vehicle brake generation system can be simplified.

  Further, in the above embodiment, the distribution of the regenerative braking torque to be generated by the motor 12 and the electric braking torque to be generated by the brake 30 with respect to the maximum braking torque is divided into a low vehicle speed region as shown in FIG. In this case, the map is defined such that the regenerative braking torque is a relatively large constant value and the electric braking torque is increased in the high vehicle speed region as the speed increases. However, the present invention is not limited to this. The map may be used.

  Furthermore, in the above embodiment, the distribution of the regenerative braking torque to be generated by the motor 12 and the electric braking torque to be generated by the brake 30 with respect to the maximum braking torque is changed according to the vehicle speed. This invention is not limited to this, It is good also as changing according to the temperature of the motor 12 or the brake 30 with a vehicle speed or instead of a vehicle speed.

DESCRIPTION OF SYMBOLS 10 Vehicle brake generation system 12 Motor 16 Battery 18 First power line 24 Motor electronic control unit (motor ECU)
30 Brake 32 Second Power Line 38 Electronic Brake Electronic Control Unit (EMB-ECU)
40 Braking control unit 42 Control signal line

Claims (6)

An electric motor which is disposed under the body spring and generates a driving torque for driving the wheel by supplying electric power and generates regenerative electric power by rotating the wheel;
An electric brake which is disposed under the body spring and generates a braking torque for braking the wheel by supplying power;
A first power line through which electric power is exchanged between a battery disposed on a body spring and the electric motor;
A second power line routed under the body spring and through which power supplied from the electric motor to the electric brake flows;
When braking of the vehicle is required, the required braking torque is obtained by supplying the regenerative braking torque accompanying the regeneration of the electric motor and the regenerative electric power generated by the electric motor in whole or in part via the second power line. An electric braking torque generated by the electric brake, and a braking torque control means generated by the electric brake;
A vehicle brake generation system comprising:   When the braking of the vehicle is requested, the braking torque control means is configured to perform the requested braking torque based on the distribution of the regenerative braking torque and the electric braking torque that are determined in advance for the maximum braking torque. 2. The vehicle brake generation system according to claim 1, wherein the regenerative braking torque is generated with priority.   When the required braking torque is larger than the regenerative braking torque that is allocated in advance with respect to the maximum braking torque, the braking torque control means generates a surplus required braking torque by the electric braking torque. The vehicle brake generation system according to claim 2.   The braking torque control means generates the regenerative braking torque and the electric braking torque at a predetermined ratio with respect to the required braking torque when braking of the vehicle is required. The brake generation system for vehicles according to 1.   4. The vehicle brake generation system according to claim 2, wherein the distribution is a value that is changed according to a vehicle speed.   5. The vehicle brake generation system according to claim 4, wherein the predetermined ratio is a value that is changed according to a vehicle speed.

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