Abstract:
PROBLEM TO BE SOLVED: To improve the startability of an internal combustion engine which can be operated at a high expansion ratio with a substantial compression ratio being lower by quickening a timing for closing an intake valve when compressing intake air in a cylinder after expanding it once. SOLUTION: When the operation stop of the engine is instructed, the engine is stopped at a position deviating from a region where intake air is expanded when tending to a compression stoke after the intake valve is closed, for example, at a target stop position which is set as a position with the intake valve closed (S210, S220). Thus, negative pressure is produced in the cylinder to allow the entry of air therein during the stop of the engine, preventing the compression ratio from being higher in the first compression stroke at the next start. As a result, knocking is prevented and the next start of the engine is smoothed. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To make a battery fully exhibit its performance by managing its temperature to be in a more proper state. SOLUTION: The charging and discharging of the battery is controlled by setting targeted charging and discharging capacity Pch*, based on the remaining capacity SOC of the battery, using a map showing the relation that the lower the temperature of the battery, with the larger the inclination of the target charging and discharging capacity Pch* with respect to the changes in the remaining capacity SOC becomes, the larger hysteresis to the change of the remaining capacity SOC becomes. By this control, the lower the temperature of the battery is, the more actively the battery is charged and discharged. Moreover, hysteresis is made larger, when the charging and discharging are performed actively so that the battery in a low temperature can be warmed effectively and its performance can be put forth sufficiently, while preventing the frequent switching of the charging and discharging. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To increase the energy efficiency of a vehicle by operating, according to the status of a power output apparatus, an internal combustion engine that the power output apparatus is equipped with. SOLUTION: In a hybrid vehicle in which power from an engine is converted to torque by a planetary gear mechanism and two motors connected to the rotating elements of the planetary gear element and is output to driveshafts connected to driving wheels, a plurality of operating lines LP, L0-L3 available where different requirements are applied as restrictions to the power output from the engine are stored; the engine is operated as the operating lines are set according to vehicle speed and the status of the motors, and drive control of the two motors is performed. As a result, it is possible to increase the energy efficiency of the vehicle while coping with restrictions on the output of devices such as motors. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve the energy efficiency of a whole vehicle by operating an internal combustion engine equipped with a power output device according to a state of a mounted power output device. SOLUTION: In a hybrid automobile for performing the torque conversion of a power from an engine by two motors connected to a planet gear mechanism and the rotary element of the planet gear mechanism, and for outputting a driving shaft connected to a driven wheel, a plurality of different operation lines LP and L0 to L3 obtained by imposing different conditions on a power to be output from an engine as constraints are stored, and an operation line is set according to a speed or the state of a motor, and an engine is operated and the driving of the two motors is controlled. As a result, it is possible to improve the energy efficiency of a vehicle, and to cope with the output limit of equipment such as a motor. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To efficiently cool a plurality of heating elements within their appropriate temperature ranges and to simplify a cooling system. SOLUTION: The cooling system 40 is constituted by a first cooling system 41 supplying cooling water from a radiator 43 to motors 31, 32 to cool the motors 31, 32, and then supplying the cooling water to banks A, B of an engine 22 via a circulation flow passage 45 and distributary passages 46a, 46b, and a second cooling system 51 branching the cooling water from the radiator 43 by a branch passage 52 to further cool the cooling water by a radiator 53 and supplying the cooled cooling water to a drive circuit 35 to cool the drive circuit 35. Due to this, the motors 31, 32, engine 22 and drive circuit 35 of which appropriate operating temperatures are different can be efficiently cooled, and the system can be simplified. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To increase the energy efficiency of a vehicle by operating an internal combustion engine in a power output system according to the status of the power output system. SOLUTION: The hybrid vehicle, which outputs power from the engine to a driveshaft connected to driving wheels through torque conversion by a planetary gear mechanism and two motors connected to rotary elements of the planetary gear mechanism, stores a plurality of different operation lines LP and L0 to L3 constraining the power output from the engine by different conditions, and sets one operation line according to vehicle speed, motor status and the like in operating the engine and controlling the drive of the two motors. This can increase the energy efficiency of the vehicle and can adjust to output limitations on equipment such as the motors. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To accurately output target power from an internal combustion engine provided with a power output device. SOLUTION: In this hybrid automobile for torque-converting power from the engine and outputting it to a driving shaft connected with a driving wheel by two motors connected with a planetary gear mechanism and a rotary element of the planetary gear mechanism, a plurality of operation lines in which fuel economy becomes the optimum state for a plurality of engine states in which degree of pressure loss in suction and exhaust differs by corresponding to output error between target power of the engine and output power outputted actually from the engine based on the target power are stored, and the operation line in which fuel economy becomes the optimum state is set from among the plurality of operation lines based on the target power and actual output power to drive and control the engine and two motors. Since the output error of the engine appears depending on degree of pressure loss in suction and exhaust, the engine can be efficiently operated and the output error of the engine can be reduced using the above-mentioned method. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To realize the changing of a target SOC (State Of Charge) in response to a driving state of a vehicle with a simple constitution. SOLUTION: A controller of an electric storage mechanism includes a hybrid ECU which performs a program including a step of calculating charging and discharging power values of a battery 400 according to charging and discharging voltage values sensed by a voltmeter and charging and discharging current value sensed by an ammeter (S100), a step of judging whether the charged power to the battery or the discharged power from the battery is limited or not (S200), a step of subtracting a point when the charging power to the battery or the discharging power from the battery is limited (S400), a step of judging whether the point becomes negative or not (S500), and a step of changing the target SOC when the point becomes negative (S600). COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To improve energy efficiency of an apparatus by operating an internal combustion engine provided in a power output apparatus corresponding to states of the power output apparatus. SOLUTION: This hybrid vehicle, which torque-converts the power from the engine with an epicyclic gear mechanism and two motors connected with a rotating element of the epicyclic gear mechanism and outputs the torque-converted value to a driving shaft connected with a driving wheel, stores a plurality of different operation lines LP, L0 to L3 with a constraint of different conditions for power outputted from the engine, and operates the engine and controls driving of the two motors by establishing the operation lines corresponding to a vehicle speed and motor conditions, thus improving energy efficiency of a vehicle and accommodating the output limit of an apparatus such as a motor. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To quickly cope with demand output power demanded by an operator and suppress vibration which can be generated in start of an internal combustion engine. SOLUTION: Control start speed Nstart is set in such a manner that the same tends to be lower as demand power P* demanded by the operator gets larger and tends to be lower as vehicle speed V increases (S130), engine 22 is motored (S150 - S190), and operation control of the engine is started when speed Ne of the engine reaches the control start speed Nstart (S220). This setting is done based on tendency that it is preferable for quickly outputting power from the engine to set the control start speed Nstart low and to quickly controlling operation of the engine, that it is preferable for suppressing vibration which can be generated at a time of start of engine to set the control start speed Nstart high and to suppress vibration due to initial explosion, and that sensitivity of the operator to vibration get lower as vehicle speed gets high. COPYRIGHT: (C)2005,JPO&NCIPI