Abstract:
PROBLEM TO BE SOLVED: To provide a vehicle with a motor drive circuit including a converter and an inverter, the vehicle properly controlling overheat of DC power supply caused by resonance of the driving circuit.SOLUTION: A controller that controls a motor drive circuit including a converter and an inverter inhibits execution of rectangular control of the inverter (S13), when satisfying that it is during an upper-arm ON control of the converter (no pressure rise)(YES at S10), motor rotational speed N is within a range of resonance rotational speed (YES at S11), and a square value of current Ib is permissible value or more (YES at S12). Meanwhile, the controller permits the execution of rectangular control (S14), when satisfying at least one of conditions such as that it is not during the upper-arm ON control (NO at S10), the motor rotational speed N is not within the range of the resonance rotational speed (NO as S11), and the square value of the current Ib is less than the permissible value (NO at S12).
Abstract:
PROBLEM TO BE SOLVED: To more properly determine abnormal conditions of a drive device. SOLUTION: When both absolute values of input/output restrictions Win, Wout of a battery are equal to or below a threshold value Wref (S110), a charge and discharge current square mean Iave is calculated as a mean value of square values of charge and discharge currents Ib of the battery (S115). When the calculated charge and discharge current square mean Iave is larger than a threshold value Iref, and a battery temperature Tb is higher than a threshold value Tbref (S120, S130), the drive device is determined to have the abnormal conditions (S140). COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To accurately determine any anomaly in a power storage means in a power supply device including multiple power supply parts each having a chargeable/dischargeable power storage means and a step-up converter capable of boosting voltage from the power storage means. SOLUTION: Any anomaly in a battery 60 is determined on a case-by-case basis as described below. In cases where a relay 62 is turned on and a relay 63 is turned off and only a step-up converter 53 is operable, it is determined that any anomaly has occurred in the battery 60 on the following occasion: when the battery voltage detected by a voltage sensor 66 is equal to an anomaly determination voltage and the charging/discharging current detected by a current sensor 68 is smaller than a first current. In cases where both the relay 62 and the relay 63 are turned on and both the step-up converter 53 and a step-up converter 54 are operable, it is determined that any anomaly has occurred in the battery 60 on the following occasion: when the battery voltage is equal to the anomaly determination voltage and the charging/discharging current is smaller than a second current different from the first current. Thus any anomaly in the battery 60 can be accurately determined. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a vehicle having a motor drive circuit including a converter and an inverter, while properly preventing overheat of a DC power supply due to resonance of the drive circuit.SOLUTION: The control device for controlling the motor drive circuit including the converter and the inverter is configured, when the converter is under upper-arm-on control (not boosted) (YES in S10) and when a motor speed N is included in a resonance rotation speed range (YES in S11), to convert a squared value of a value of a current Ib measured by an in-vehicle current sensor to a squared value of a true value of the current Ib detected off-line in advance (S12), and to prohibit execution of rectangular control (S14) when the squared value of the true value of the current Ib is equal to or larger than a permissible value (YES in S13).
Abstract:
PROBLEM TO BE SOLVED: To simultaneously achieve brake cooperative control between hydraulic braking and regenerative braking, after performing the control for protecting the lithium-ion secondary battery from segregation of lithium metal, in an electric vehicle that mounts a lithium-ion secondary battery.SOLUTION: An HV-ECU 302 adjusts an upper-limit value of a charging power of a battery based on the charging/discharging history of the battery 18, in order to restrain the segregation of the lithium metal in the battery 18 composed of the lithium-ion secondary battery. In addition, the HV-ECU 302 executes the brake cooperative control for determining sharing of hydraulic braking force by a braking device 10 and regenerative braking force by a second MG 60 to the requested braking force corresponding to brake pedal operation, within the range of the adjusted upper-limit value of the charging power. A limitation degree of the upper-limit value of the charging power when restricting the upper-limit value of the charging power in order to restrain the segregation of the lithium metal, is variably set in accordance with a vehicle's speed and a state of the battery 18.
Abstract:
PROBLEM TO BE SOLVED: To prevent drivability of a vehicle from degrading because of instantaneous fluctuation of a vehicle braking force, with a recovery energy of regenerative power generation being assured, while control to suppress Li precipitation is performed, relating to a vehicle on which a lithium ion secondary battery is mounted.SOLUTION: An HV-ECU302 adjusts the upper limit value of charge power based on charging/discharging history of a battery 18, to suppress Li precipitation in the battery 18 which is a lithium ion secondary battery. Further, the HV-ECU302 performs braking coordination control which determines assignment of hydraulic braking force by a control device 10 and regenerative braking force by a second MG60, in response to a requested braking force corresponding to the operation of a brake pedal within the range of upper limit value of charge power that is adjusted. The limitation degree of a charge power upper limit value when limiting the charge power upper limit value for suppressing Li precipitation is variably set according to a detection value of a hydraulic response rate at a brake liquid pressure circuit 80 for supplying liquid pressure to the control device 10.
Abstract:
PROBLEM TO BE SOLVED: To provide a battery pack system for use in an electric vehicle where electrolytic solution emitted from a single battery in the form of mist is prevented from flowing out of an exhaust passage with a simple configuration.SOLUTION: A battery pack case 5 housing a battery pack 4 is installed in the rear of a rear seat 2 in a cabin 1. An exhaust duct 7 with a cooling fan 6 is connected to the battery pack case 5, and an air inlet 3 is provided in the battery pack case 5 on the opposite side of an exhaust duct connection. A sirocco fan or an axial-flow fan is used as the cooling fan 6. Air for cooling the battery pack 4 forcibly is fed sequentially through the cabin 1, the air inlet 3, the battery pack case 5, an exhaust duct 7, the cooling fan 6 and the exhaust duct 7. Electrolyte solution emitted, in the form of mist, from the single battery to the cooling fan 6 together with the air is made to collide against a blade lattice or a wall surface of the fan and to adhere thereto.
Abstract:
PROBLEM TO BE SOLVED: To provide a determination device which determines a state (a deposition amount of lithium metal) of lithium metal. SOLUTION: The determination device determines a state of a lithium ion battery 20 which outputs energy used when a vehicle 1 travels and receives regeneration energy in response to switching from on to off of an accelerator 101 of the vehicle, and includes an estimation means 90 for estimating the deposition amount of the lithium metal in the lithium ion battery. The estimation means counts the number of times that an accelerator opening variation upon switching of the accelerator from on to off exceeds a predetermined value, and estimates the deposition amount of the lithium metal by using data presenting relationship between the count value and the deposition amount of the lithium metal. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve reliability of a battery pack by preventing incorrect discrimination, by detecting an abnormal battery using a measurement battery voltage for each voltage detection unit, which is optimally set according to battery characteristics. SOLUTION: Battery voltage is measured by a voltage measurement means 114 for each voltage detection unit set according to a predetermined conditions based on the battery characteristics, such as, variation of internal resistance, accuracy of battery voltage measured by the voltage measurement means, the number of unit cells sharing common internal space of each battery case, or the like. Since the abnormal battery is detected by an abnormal battery detection means 120 based on the measured battery voltage, reliability of the battery pack can be improved, by preventing incorrect discrimination of the abnormal voltage detection at the unit cell level.