JP2017190022A - Vehicular control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly execute discharge control of a high voltage system by normally functioning a controller.SOLUTION: A vehicular control device includes: a high voltage system 44 which has a high voltage battery 40 and a converter 42 connected to the battery via a relay 50; a low voltage system which has a low voltage battery having a lower voltage than that of the high voltage battery 40; a power supply control section 82 which controls a starter generator 61 connected to the low voltage battery and supplies power from the starter generator 61 to the low voltage battery; and a discharge control section 83 which controls the relay 50 and the converter 42 and discharges charges of smoothing capacitors 46 and 47 of the high voltage system 44. The power supply control section 82 controls the starter generator 61 and supplies the power to the low voltage battery when a collision between an own vehicle and an object is predicted. The discharge control section 83 controls the converter 42 and discharges the charges of the smoothing capacitors 46 and 47 after cutting off the relay 50 when the collision between the own vehicle and the object is predicted.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle control device including a collision prediction unit that predicts a collision between a host vehicle and an object.

  In recent years, there has been a driving support system that monitors the front and rear of a vehicle using a millimeter wave radar, an infrared laser, a stereo camera, a monocular camera, etc., and issues a warning or performs automatic braking when there is a possibility of a vehicle collision. It has been developed (see Patent Documents 1 to 3). In addition, since the vehicle described in Patent Documents 1 to 3 includes a high voltage system including a drive motor and a high voltage battery, the electric charge remaining in the high voltage system components is discharged before the vehicle collision. Yes. There has also been proposed a vehicle that discharges electric charges remaining in high-voltage components based on an airbag deployment signal at the time of a vehicle collision (see Patent Document 4).

JP 2005-20952 A JP 2010-279224 A JP 2015-146709 A JP 2014-171309 A

  By the way, in order to discharge the electric charge remaining in the high voltage system component, it is necessary to make the controller that performs the high voltage system discharge control function normally. For example, when the power supply voltage of the controller is lowered, the operation of the controller becomes unstable, and thus it is difficult to appropriately execute the high voltage system discharge control.

  An object of the present invention is to appropriately execute discharge control of a high voltage system by causing a controller to function normally.

  The vehicle control device of the present invention is a vehicle control device including a collision prediction unit that predicts a collision between the host vehicle and an object, and an electric device connected to the first power storage unit via a relay. And a high voltage system including: a low voltage system including a second power storage unit having a voltage lower than that of the first power storage unit; and a power supply device connected to the second power storage unit. A power supply control unit that supplies power to the second power storage unit, and a discharge control that is provided in a controller connected to the second power storage unit, controls the relay and the electrical device, and discharges the high-voltage smoothing capacitor The power supply control unit controls the power supply device to supply power to the second power storage unit when the collision between the host vehicle and the object is predicted, and the discharge The control unit predicts a collision between the host vehicle and the object. Case, by controlling the electric device after blocking of the relay discharging the smoothing capacitor.

  According to the present invention, the discharge controller discharges the smoothing capacitor after the relay is shut off when a collision between the host vehicle and the object is predicted. As a result, even if the vehicle collides, leakage from the high voltage system can be prevented. In addition, when a collision between the host vehicle and the preceding vehicle is predicted, power is supplied to the second power storage unit by controlling the power supply device, and therefore the power supply voltage of the controller including the discharge control unit is ensured. Can do. As a result, the controller can function normally, and high-voltage discharge control can be performed appropriately.

It is the schematic which shows an example of the vehicle provided with the control apparatus for vehicles which is one embodiment of this invention. It is a figure which shows an example of the control system of the control apparatus for vehicles. It is explanatory drawing which shows the driving | running | working condition of the own vehicle and a preceding vehicle. It is a flowchart which shows an example of the execution procedure of capacitor | condenser discharge control. It is explanatory drawing which shows the power supply condition of the low voltage system in a capacitor discharge control, and a high voltage system. It is a flowchart which shows the other example of the execution procedure of capacitor | condenser discharge control.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram illustrating an example of a vehicle 11 including a vehicle control device 10 according to an embodiment of the present invention. As shown in FIG. 1, the power unit 12 mounted on the vehicle 11 is provided with an engine 13 and a motor generator 14 as power sources. Further, the power unit 12 is provided with a continuously variable transmission 17 including a primary pulley 15 and a secondary pulley 16. A crankshaft 20 of the engine 13 is connected to the primary pulley 15 via a forward / reverse switching mechanism 18 and a torque converter 19, and a rotor 21 of the motor generator 14 is connected. A wheel 24 is connected to the secondary pulley 16 via a wheel output shaft 22, a differential mechanism 23, and the like. The forward / reverse switching mechanism 18 includes a forward clutch, a reverse brake, a planetary gear train, and the like.

  The vehicle 11 is provided with a brake device 30 that brakes the wheels 24. The brake device 30 includes a brake pedal 31 that is operated by a driver, and a master cylinder 32 that generates brake fluid pressure in accordance with an operation amount of the brake pedal 31. The brake device 30 includes a disk rotor 33 fixed to the wheel 24 and a caliper 34 that brakes the disk rotor 33. Further, the master cylinder 32 and the caliper 34 are connected via a brake actuator 35 that controls the brake fluid pressure. The brake actuator 35 includes an electric pump, an accumulator, an electromagnetic valve, and the like (not shown).

[High voltage system]
The vehicle control device 10 is provided with a high voltage system 44 including a high voltage battery (first power storage body) 40, an inverter 41, a converter 42, an electric compressor 43, and the like. Inverter 41 constituting high voltage system 44 is connected to stator 45 of motor generator 14. The inverter 41 is configured by a smoothing capacitor 46, a switching element, and the like, and has a function of mutually converting DC power and AC power. When powering the motor generator 14, DC power from the high voltage battery 40 is converted into AC power via the inverter 41 and supplied to the stator 45. On the other hand, when the motor generator 14 is regenerated, AC power from the stator 45 is converted into DC power via the inverter 41 and supplied to the high voltage battery 40. Further, the converter (electric device) 42 constituting the high voltage system 44 is connected not only to the high voltage system 44 but also to a low voltage system 64 described later. The converter 42 is configured by a smoothing capacitor 47, a switching element, and the like, and has a function of stepping down DC power from the high voltage battery 40 and supplying it to the low voltage system 64. The smoothing capacitors 46 and 47 provided in the inverter 41 and the converter 42 are capacitors inserted between terminals from the viewpoint of reducing the pulsating component of the current. The electric compressor 43 is a compressor that compresses the refrigerant gas of the air conditioning equipment, and is driven by electric power from the high voltage battery 40.

  A positive line 51 a is connected to the positive terminal 40 a of the high voltage battery 40 via a positive contact 50 a of the relay 50, and a negative terminal 40 b of the relay 50 is connected to the negative terminal 40 b of the high voltage battery 40. The negative electrode line 51b is connected. A positive line 52 a is connected to the positive terminal 41 a of the inverter 41, a positive line 53 a is connected to the positive terminal 42 a of the converter 42, and a positive line 54 a is connected to the positive terminal 43 a of the electric compressor 43. Has been. These positive electrode lines 52 a to 54 a are connected to the positive electrode line 51 a of the high voltage battery 40. Further, a negative electrode line 52 b is connected to the negative electrode terminal 41 b of the inverter 41, a negative electrode line 53 b is connected to the negative electrode terminal 42 b of the converter 42, and a negative electrode line 54 b is connected to the negative electrode terminal 43 b of the electric compressor 43. Has been. These negative electrode lines 52 b to 54 b are connected to the negative electrode line 51 b of the high voltage battery 40. Thus, the inverter 41, the converter 42, and the electric compressor 43 are electrically connected to the high voltage battery 40 through the relay 50.

[Low voltage system]
The vehicle control apparatus 10 is provided with a low voltage system 64 including a low voltage battery (second power storage unit) 60 having a lower voltage than the high voltage battery 40, a starter generator 61, a controller 62, various electrical components 63, and the like. Yes. A starter generator (generator) 61 connected to the crankshaft 20 via a belt mechanism 65 is a so-called ISG (integrated starter generator) that functions as a generator and an electric motor. The starter generator 61 not only functions as a generator that is driven by the crankshaft 20 to generate power, but also functions as an electric motor that starts and rotates the crankshaft 20. A positive line 70 is connected to the positive terminal 60 a of the low voltage battery 60, a positive line 71 is connected to the positive terminal 42 c of the converter 42, and a positive line 72 is connected to the positive terminal 61 a of the starter generator 61. Has been. These positive electrode lines 70 to 72 are connected to each other. Further, the controller 62 and various electrical components 63 are connected to the positive electrode lines 70 to 72. That is, a low voltage battery 60 is connected to the controller 62 and various electrical components 63 as a power source. The starter generator 61 is electrically connected to a low voltage battery 60.

[Control system]
Hereinafter, the control system of the vehicle control device 10 will be described. FIG. 2 is a diagram illustrating an example of a control system of the vehicle control device 10. The vehicle control device 10 has a controller 62 configured by a computer or the like in order to output control signals to various devices constituting the vehicle 11. The controller 62 executes automatic brake control for automatically braking the vehicle 11 when a collision between the host vehicle 11 and the preceding vehicle 100 is predicted. In addition, when a collision between the host vehicle 11 and the preceding vehicle 100 is predicted, the controller 62 performs capacitor discharge control for discharging the smoothing capacitors 46 and 47 of the high voltage system 44 in preparation for a vehicle collision.

  As shown in FIG. 2, the controller 62 has functional units such as a collision prediction unit 80, a brake control unit 81, a power supply control unit 82, and a discharge control unit 83 in order to execute automatic brake control and capacitor discharge control. Yes. The controller 62 also includes a camera unit 84 that images the front of the vehicle, a vehicle speed sensor 85 that detects the vehicle speed that is the traveling speed of the vehicle 11, an accelerator sensor 86 that detects the amount of operation of the accelerator pedal, and the amount of operation of the brake pedal 31. A brake sensor 87 to be detected is connected.

  The collision prediction unit 80 of the controller 62 processes the image information from the camera unit 84 and detects information of the preceding vehicle (target object) 100 traveling in front of the host vehicle 11. The information on the preceding vehicle 100 includes an inter-vehicle distance between the host vehicle 11 and the preceding vehicle 100, a traveling speed difference, and the like. Then, the collision prediction unit 80 predicts whether or not the own vehicle 11 and the preceding vehicle 100 will collide after a predetermined time, based on the inter-vehicle distance and the traveling speed difference between the own vehicle 11 and the preceding vehicle 100. . Here, FIG. 3 is an explanatory diagram showing a traveling situation of the host vehicle 11 and the preceding vehicle 100. As indicated by reference numeral V <b> 1 in FIG. 3, when the inter-vehicle distance Da between the host vehicle 11 and the preceding vehicle 100 is less than a predetermined first distance D <b> 1, the collision prediction unit 80 determines that the first collision prediction situation is present. Is done. As described above, when the collision prediction unit 80 determines that the first collision prediction state is set, the capacitor discharge control is started by the power supply control unit 82 and the discharge control unit 83 as described later.

  Subsequently, as indicated by reference numeral V2 in FIG. 3, when the inter-vehicle distance Da between the host vehicle 11 and the preceding vehicle 100 is less than the second distance D2 shorter than the first distance D1, the collision prediction unit 80 It is determined that there is a two-collision prediction situation. As described above, when the collision prediction unit 80 determines that the current state is the second collision prediction state, the brake control unit 81 starts the automatic brake control. In this automatic brake control, a control signal is output from the brake control unit 81 to the brake actuator 35, and the brake hydraulic pressure supplied from the brake actuator 35 to the caliper 34 is increased. Thus, automatic braking by the brake device 30 is executed so as to avoid a collision with the preceding vehicle 100.

[Capacitor discharge control]
Hereinafter, capacitor discharge control executed by the vehicle control device 10 will be described. FIG. 4 is a flowchart showing an example of the execution procedure of the capacitor discharge control. FIG. 5 is an explanatory diagram showing the power supply status of the low voltage system 64 and the high voltage system 44 in the capacitor discharge control. As shown in FIG. 4, in step S <b> 10, a vehicle forward monitoring process by the collision prediction unit 80 is executed. In step S11, it is determined whether or not the state is a collision prediction situation (the first collision prediction situation described above). If it is determined in step S11 that the current situation is a collision prediction situation, that is, if a collision between the host vehicle 11 and the preceding vehicle 100 is predicted, the process proceeds to step S12 to determine whether the engine 13 is stopped. Determined.

  If it is determined in step S12 that the engine 13 is stopped, the process proceeds to step S13, and an engine start process for starting the engine 13 is executed. In the engine starting process, the starter generator 61 is controlled to the power running state by the power supply control unit 82, and the engine accessory 88 including an injector or the like is controlled by the power supply control unit 82, and the stopped engine 13 is started. In subsequent step S <b> 14, the starter generator 61 is controlled to the power generation state by the power supply control unit 82. As a result, the starter generator 61 generates electric power using the engine power, so that power is supplied from the starter generator 61 to the low voltage battery 60 as shown by an arrow a1 in FIG.

  Thus, when the starter generator 61 is controlled to the power generation state, as shown in FIG. 4, in step S15, the relay 50 is switched from the conduction state to the cutoff state by the discharge control unit 83, and the high voltage system 44 The voltage battery 40 is electrically disconnected. In the subsequent step S16, the converter 42 is controlled to be in an operating state by the discharge control unit 83, and a switching element (not shown) of the converter 42 is subjected to switching control. As a result, power is supplied from the high voltage system 44 to the low voltage system 64 via the converter 42 as indicated by an arrow b1 in FIG. 5, so that it is accumulated in the smoothing capacitors 46 and 47 of the inverter 41 and the converter 42. Charge is released.

  As described above, when the collision between the host vehicle 11 and the preceding vehicle 100 is predicted, the discharge control unit 83 discharges the smoothing capacitors 46 and 47 after the relay 50 is shut off. As a result, even if the positive line of the high voltage system 44 is damaged due to a vehicle collision, leakage from the high voltage system 44 can be prevented. In addition, when a collision between the host vehicle 11 and the preceding vehicle 100 is predicted, the starter generator 61 is controlled to be in a power generation state, so that the power supply voltage of the controller 62 including the discharge control unit 83 can be ensured. The controller 62 can function normally. Thereby, when a collision between the host vehicle 11 and the preceding vehicle 100 is predicted, the capacitor discharge control can be executed by the normally functioning controller 62, and the reliability of the vehicle control device 10 is improved. Can do.

[Other embodiments]
In the above description, the starter generator 61, which is a power supply device, is controlled in a power generation state, and power is supplied from the starter generator 61 to the low voltage battery 60. However, the present invention is not limited to this, and the converter 42 is used as the power supply device. May function. Here, FIG. 6 is a flowchart showing another example of the execution procedure of the capacitor discharge control. In FIG. 6, the same steps as those shown in FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 6, when it is determined in step S11 that the current situation is a collision prediction situation, that is, when a collision between the host vehicle 11 and the preceding vehicle 100 is predicted, the process proceeds to step S20 and the power supply control unit 82. Thus, the converter (power supply device) 42 is controlled to be in an operating state. As a result, as indicated by the dashed arrow a2 in FIG. 5, power is supplied from the converter 42 to the low voltage battery 60, and the power supply voltage of the controller 62 is secured. Thus, when the power supply voltage of the controller 62 is secured, as shown in FIG. 6, in step S15, the relay 50 is switched to the cut-off state by the discharge control unit 83, and the high-voltage battery 40 is disconnected from the high-voltage system 44. Electrically disconnected. In subsequent step S <b> 16, converter 42 is controlled to be in an operating state by discharge control unit 83. As a result, power is supplied from the high voltage system 44 to the low voltage system 64 via the converter 42 as indicated by an arrow b1 in FIG. 5, so that it is accumulated in the smoothing capacitors 46 and 47 of the inverter 41 and the converter 42. Can be released.

  In the above description, the converter 42, which is an electric device, is controlled to be in an operating state, and the inverter 41 and the smoothing capacitors 46 and 47 of the converter 42 are discharged. However, the present invention is not limited to this. The smoothing capacitors 46 and 47 may be discharged using another electrical device such as the compressor 43. For example, as indicated by a broken line arrow b2 in FIG. 5, by supplying power from the high voltage system 44 to the stator 45 by controlling the inverter (electrical equipment) 41, the smoothing capacitors 46 of the inverter 41 and the converter 42, 47 may be discharged. Further, as indicated by a broken line arrow b3 in FIG. 5, the smoothing capacitors 46 and 47 of the inverter 41 and the converter 42 may be discharged by driving the electric compressor (electric device) 43 and consuming electric power.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. In the above description, the vehicle control device 10 is applied to a hybrid vehicle including the engine 13 and the motor generator 14 as power sources. However, the present invention is not limited to this, and an electric power source including only an electric motor as a power source. The vehicle control device 10 may be applied to an automobile, that is, an electric vehicle that does not have the engine 13 as a power source. Thus, even when the vehicle control device 10 is applied to an electric vehicle, the present invention can be effectively applied by using the converter 42 as a power supply device.

  In the above description, the function units of the collision prediction unit 80, the power supply control unit 82, and the discharge control unit 83 are incorporated in one controller 62, but the present invention is not limited to this, and a plurality of units connected to be communicable with each other. The collision prediction unit 80, the power supply control unit 82, and the discharge control unit 83 may be separately incorporated into the controller 62. In the above description, the automatic brake control is executed after the capacitor discharge control is executed. However, the present invention is not limited to this, and the automatic brake control may be executed prior to the capacitor discharge control. Capacitor discharge control and automatic brake control may be executed at the timing. In the above description, the automatic brake control is executed when a collision between the host vehicle 11 and the preceding vehicle 100 is predicted. However, the present invention is not limited to this. For example, when a collision between the host vehicle 11 and the preceding vehicle 100 is predicted, only capacitor discharge control may be executed.

  In the above description, the preceding vehicle 100 ahead of the vehicle is monitored by the collision prediction unit 80, but the present invention is not limited to this, and other obstacles and the like may be monitored as well as the preceding vehicle 100. Further, the monitoring direction is not limited to the front side of the vehicle, and the collision prediction unit 80 may monitor a vehicle, an obstacle, or the like on the rear or side of the vehicle. In the above description, it is determined whether or not to collide based on information from the camera unit 84. However, the present invention is not limited to this, and whether or not to collide using a millimeter wave radar or an infrared laser. May be determined. Note that the camera unit 84 may be a stereo camera or a monocular camera. In the above description, the battery is used as the first power storage body or the second power storage body. However, the present invention is not limited to this, and a capacitor may be used as the first power storage body or the second power storage body. . In the above description, the starter generator 61 is employed as the generator, but the present invention is not limited to this, and an alternator may be employed as the generator. In addition, the relay 50 provided in the high voltage system 44 may be a relay that opens and closes a contact by an electromagnet, or may be a semiconductor relay that is configured using a semiconductor.

DESCRIPTION OF SYMBOLS 10 Vehicle control apparatus 11 Vehicle, own vehicle 40 High voltage battery (1st electrical storage body)
41 Inverter (electric equipment)
42 Converter (electric equipment, power supply equipment)
43 Electric compressor (electrical equipment)
44 High voltage system 46 Smoothing capacitor 47 Smoothing capacitor 50 Relay 60 Low voltage battery (second power storage unit)
61 Starter generator (power supply equipment, generator)
62 Controller 64 Low Voltage System 80 Collision Prediction Unit 81 Brake Control Unit 82 Power Supply Control Unit 83 Discharge Control Unit 100 Leading Vehicle (Object)

Claims (4)

A vehicle control device including a collision prediction unit that predicts a collision between the host vehicle and an object,
A high voltage system comprising a first power storage unit and an electrical device connected to the first power storage unit via a relay;
A low voltage system comprising a second power storage unit having a lower voltage than the first power storage unit;
A power supply controller that controls a power supply device connected to the second power storage unit and supplies power from the power supply device to the second power storage unit;
A discharge controller provided in a controller connected to the second power storage unit to control the relay and the electric device to discharge the high-voltage smoothing capacitor;
Have
The power feeding control unit controls the power feeding device to supply power to the second power storage unit when a collision between the host vehicle and the object is predicted,
When the collision between the host vehicle and the object is predicted, the discharge control unit is a vehicle control device that controls the electric device to discharge the smoothing capacitor after the relay is shut off. The vehicle control device according to claim 1,
The electrical device is a converter that connects the high voltage system and the low voltage system,
The said discharge control part is a control apparatus for vehicles which controls the said converter and discharges the said smoothing capacitor, when the collision with the said own vehicle and the said target object is estimated. The vehicle control device according to claim 1 or 2,
The power supply device is a generator connected to an engine,
The power supply control unit is a vehicle control device that starts the engine and controls the generator to a power generation state when a collision between the host vehicle and the object is predicted. The vehicle control device according to claim 2,
The converter is the electric device and the power supply device,
The power supply control unit is a vehicle control device that controls the converter to supply power from the high voltage system to the low voltage system when a collision between the host vehicle and the object is predicted.

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