Abstract:
PROBLEM TO BE SOLVED: To prevent a condition in which an engine cannot be started while receiving a reaction force of a drive shaft by a motor. SOLUTION: An automobile is provided with a mechanical pump driven by an engine 22 and an electric driven pump 92 as pumps for generating hydraulic pressure used for actuating a transmission gear 60 to transmit a power from a motor MG2 to a ring gear shaft 32a. When temperature of the electric driven pump 92 reaches a tolerance temperature, start of the engine 22 is banned. When the temperature is lower than the tolerance temperature, the engine 22 is stopped according to its temperature rise, and motor traveling by the motor MG2 is banned. Assist drive of the electric driven pump 92 at the time of changing the speed of the transmission gear 60 during operation of the engine 22 is banned. Therefore, a driving frequency of the electric driven pump 92 becomes small, the temperature can be avoided from reaching the tolerance temperature, and such a condition can be prevented that the power from the motor MG2 for receiving the reaction force of the drive shaft cannot be transmitted and the engine 22 cannot be started. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To restrain generation of a shock and an abnormal sound caused when starting and stopping an internal combustion engine, in a vehicular driving device, a motive power output device having this device and its control method. SOLUTION: When a vehicle speed is not a value 0 when indicating starting of an engine 22 when a shift lever 81 shuts down inverters 41 and 42 in an NL range, the starting of the engine 22 is prohibited until the vehicle speed becomes the value 0. When the vehicle speed V is the value 0, shutdown of the inverter 41 on the motor MG1 side is released after locking rotation of a ring gear shaft 32a by setting two hydraulic brakes of a transmission 60 to ON, and the starting is performed by cranking the engine 22 by a motor MG1. Thus, since reaction can be shared when cranking the engine 22 by the motor MG1 without using a motor MG2, even when output of torque from the motor MG2 is restricted, a starting shock can be restrained. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To suppress drop in torque to a drive shaft and gear change shock, at the time of change-over of a speed stage of a transmission. SOLUTION: When change-over of the speed stage of the transmission 60 is required, an engine 22 and motors MG1, MG2 are controlled such that all required torque Tr* required to the drive shaft is covered by torque transmitted from the engine 22 to a ring gear shaft 32a via a power distribution integrated mechanism 30, along with power generation of the motor MG1 receiving engine torque reaction force within a range of an input limit Win of a battery 50, and then, the change-over of the speed stage is performed. Due to this, since the speed stage can be changed after torque required to be output from the motor MG2 to the drive shaft is set to be approximately 0, drop in the torque and gear change shock at the time of change-over of the speed stage can be suppressed. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To improve fuel economy of a hybrid automobile and to stabilize fuel economy. SOLUTION: This hybrid automobile travels by transmitting power form an engine and power from a motor MG2 to a driving shaft and is capable of storing power generated with a part of the power from the engine by the motor MG1 into a battery. Required power Pr* of a driving shaft is set based on an accelerator opening and battery charging power Pbi is set based on SOC. The sum of both of the power Pr* and the power Pbi is made as engine target power Pe* (S100 to S108). When the engine target power Pe* is less than a prescribed lower limit valve Plow, the engine target power Pe* is changed to the lower limit value Plow and the battery charging power Pbi is also changed according to the change (S112), to operate the engine and the motors MG1 and MG2. Since the lower limit value Plow is set so that efficiency for an output of the engine may be optimum efficiency, the engine can be prevented from being operated in a low output region having bad efficiency. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To reasonably and suitably preheat an engine and its related parts. SOLUTION: A hybrid ECU determines that a driver has an intention of starting traveling when a starter switch is changed over from the off-state to the on-state (S110), the temperature of each item (cooling water in the engine, injector and lubricating oil) is input (S120), the necessity of preheat is determined depending on whether or not each item reaches a suitable temperature range (S130), when preheat is necessary, an engine start permitting flag is set to "0" to inhibit starting of the engine (S140), and subsequently, an instruction for preheating of the item required to be preheated is given to the engine ECU (S150) to end the program. On the other hand S130, when all items reach suitable temperature range, preheating is determined to be unnecessary, and the engine starting permitting flag F is set to "1" to permit starting of the engine (S160) to end the program. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a cooling device for an internal combustion engine which prevents a sudden temperature fall of cooling water circulating in the internal combustion engine. SOLUTION: A warming-up control means 50 controls a pump 38 for a heat accumulation tank and a three-way selector valve 30 and warms up the engine by supplying the hot cooling water pooled in the heat accumulation tank 36 to the engine 10. When temperature of the cooling water returned from a heater core 44 to the engine 10 is below that of the cooling water discharged from the heat accumulation tank 36, the warming-up control means 50 controls the three-way selector valve 30 and adjusts a flow rate of the cooling water circulating through the heater core 44 and the engine 10 below a predetermined flow rate. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To surely start an engine when the engine is cranked by a motor according to the discharge of a battery. SOLUTION: The lower the temperature T of cooling medium for cooling the engine in the condition of the engine and the lower the remaining capacity SOC in the condition of the battery, the lower the target cranking speed N* of the engine is set, and the motor is driven by using a power from the battery at the target cranking speed N* to perform the cranking of the engine. Thus, since the power of the battery is assured so that the engine can be re-started after the engine fails to start, the engine is more surely started. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a rotation speed control device for an internal combustion engine favorably controlling the rotation speed, even if performing a feedback control of the rotation speed of the internal combustion engine in a condition directly connected to a driving wheel. SOLUTION: In a driving system of a hybrid vehicle, a crankshaft 10a of the internal combustion engine 10 is directly connected to the driving wheel 15 via a power division mechanism 13. An ECU 16 performs the feedback control of the rotation speed by regulating the throttle opening using a feedback correction term eqi calculated according to a deviation between the actual rotation speed ene and the target rotation speed entcal of the internal combustion engine 10. Wherein the ECU 16 finds feedback correction terms eqi1-eqi3 for every three operation regions divided according to the car speed so as to control the rotation speed using the feedback correction term in the operation region corresponding to the car speed at that time.
Abstract:
PROBLEM TO BE SOLVED: To provide a control device for reducing a shift shock in a power transmission device for a vehicle. SOLUTION: When the differential state of a differential section 11 changes according to the shift of an automatic shift section 20, an inertia cancel power calculation means 72 calculates an inertia cancel power Pg_iner for canceling inertial torque Tint generated in a first motor M1. Also, a second motor allowable range determination means 76 determines a second motor torque upper limit value Tm_max or a second motor torque lower limit value Tm_min based on a first motor output Pg' obtained by excluding the inertial cancel power Pg_iner. Therefore, the fluctuation of the inertia cancel power Pg_iner during the shift of the automatic shift section 20 can be prevented from affecting second motor torque Tm limited to the second motor torque upper limit value Tm_max and the second motor torque lower limit value Tm_min. As a result, it is possible to reduce shift shock. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a control device for reducing transmission shock of an automatic transmission part in a vehicle drive unit equipped with an automatic transmission part and a differential mechanism to which a motor is connected. SOLUTION: When a rotation speed N M2 of a second motor is changed by a speed change (downshift) in an automatic transmission part 20, a target engine rotation speed change rate dNe*/dt is changed in accordance with a rotational acceleration dN M2 /dt of the second motor. Thereby, even if the rotation speed N M2 of the second motor M2 is changed by the downshift in the automatic transmission part 20, and, influenced by this, the engine rotation speed Ne is changed, the engine rotation speed Ne is prevented from substantially deviating from the target engine rotation speed dNe*. In consequence, a variation in the first motor feedback torque TF M1 is suppressed that is changed so as to cause the engine rotation speed Ne to correspond to the target engine rotation speed dNe*, reducing transmission shock at the downshift. COPYRIGHT: (C)2009,JPO&INPIT