Abstract:
PROBLEM TO BE SOLVED: To enhance the operability and fuel consumption of a vehicle by performing appropriate creep force setting reflecting the brake operation of an operator in running at the time of brake pedal operation. SOLUTION: A drive torque calculating section 110 calculates vehicle drive torque Tv depending on the vehicle speed and the accelerator operation value ACL. The demand drive torque Trq of the vehicle is set by the product of the vehicle drive torque Tv and a correction factor kc. A creep cut section 120 sets the basic set value kc# of the correction factor kc at the time of brake operation. A drive torque variation rate control section 150 controls the variation rate dkc of correction factor depending on a brake variation rate dBRK. Consequently, the variation rate is controlled depending on an operation amount BRK, when the correction factor kc is varied for creep depending on the brake variation rate dBRK. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a vehicle equipped with a plurality of motors for outputting power to a plurality of axles, in which power balance is more properly performed, and unexpected charging/discharging of an electrical storage device is suppressed. SOLUTION: Correction processing is applied to required front wheel torque Tfd and required rear wheel torque Trd to be calculated by required torque T* and front and rear wheel torque distribution ratios Df and Dr, so that front wheel command torque Tf* and a rear wheel command torque Tr* can be set (S110 to S160), and a motor use upper and lower limit powers or motor upper and lower limit torque are calculated based on the front wheel command torque Tf* and the rear wheel command torque Tr* and input and output limits Win and Wout of a battery (S180, S190), and torque commands Tm2* and Tm3* of motors MG2 and MG3 are set with restriction by the motor upper and lower limit torque, and the motors MG2 and MG3 are driven (S200 to S220). Thus, it is possible to more properly perform power balance, and to suppress the unexpected charging/discharging of the battery 50. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a controller for a vehicle capable of enhancing controllability for driving force, in the vehicle including a plurality of power sources for driving a plurality of wheels. SOLUTION: A distribution ratio determining part 95 determines a distribution ratio of a request torque F, based on a static load distribution ratio, when a sign of the request torque F is negative. The distribution ratio determining part 95 determines the distribution ratio of the request torque F, based on a dynamic load distribution ratio, when the sign of the request torque F is positive. The distribution ratio determining part 95 determines the distribution ratio, using the static charge distribution ratio and the dynamic load distribution ratio, when the sign of the request torque F is varied. The driving force is thereby prevented from being varied discontinuously in the front and rear wheels of the vehicle, even when the sign of the request torque F varies. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a controller for a vehicle capable of enhancing a vehicle stability. SOLUTION: A driving force control part 90B changes a front wheel command torque Tfcm and a rear wheel command torque Trcm to make the torques brought within a prescribed range. The driving force control part 90B limits the change of the rear wheel command torque Trcm (keeps the rear wheel command torque Trcm constant) until the front wheel command torque Tfcm comes to the torque within the prescribed range, for example, when the rear wheel command torque Trcm comes to the torque within the prescribed range before the front wheel command torque Tfcm comes thereto. The driving force control part 90B releases the limitation of the change of the rear wheel command torque Trcm, after the front wheel command torque Tfcm and the rear wheel command torque Trcm come within the prescribed range. The vehicle stability is thereby enhanced in the vehicle including a plurality of power sources for driving a plurality of wheels. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress the loss of friction of an engine in the case of performing the motoring of the engine according to the stop of fuel supply. SOLUTION: When a request damping power Pv exceeds the input limit Win of a battery, the fuel supply of an engine is stopped (step S100 to S120, S140), and when a speed V of the vehicle is a relatively high speed, the target valve timing VT* of the engine 22 is set so as to be made later than normal valve timing VT only by ΔVT (step S150 to S170), and the air intake valve of the engine is opened and closed in the set target valve timing VT*, and two motors and the engine are controlled so that the monitoring of the engine can be performed (step S180 to step S230). Thus, it is possible to reduce the friction torque Vf of the engine, and to suppress the friction loss by setting the target valve timing VT* to be later than usual. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a power output device capable of further adequately operating an engine. SOLUTION: In an automobile comprising an engine, a first motor, a driving shaft and a second motor each connected to a planetary gear mechanism, and a battery exchanging power with the first motor and the second motor, an estimated power Peest outputted from the engine is calculated, considering an inertia Ti of the system composed of the engine and the first motor (S120 and S130), an upper limit power Pemax is set based on the calculated estimated power Peest, a current power Pr currently outputted to the driving shaft and an input restriction Win of the battery (S140-S160), and a requested power P* is restricted by the upper limit power Pemax to set a target power Pe* to be output from the engine. According to this, the target power Pe* can be further adequately set, compared with the case not considering the inertia Ti, and the engine can be more adequately operated. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To allow an inverter to be cooled with proper cooling performance according to a heating amount of inverter switching elements in a system provided with a cooling device for cooling the inverter.SOLUTION: A higher one of switching frequencies for first and second inverters 22 and 23 is set as a switching frequency for inverter cooling control. Further, a higher one of motor outputs for first and second AC motors 12 and 13 is set as a motor output for inverter cooling control. A target cooling water flow rate for inverter cooling control according to the switching frequency and motor output for inverter cooling control is calculated, and an electric water pump 39 is driven so that a flow rate of cooling water for a cooling device 40 may be the target cooling water flow rate. This makes it possible to properly respond to variation in the heating amount of inverter switching elements due to any change in the switching frequency and motor output, which changes a flow rate of the cooling water, so that the cooling performance of the cooling device 40 can vary.
Abstract:
PROBLEM TO BE SOLVED: To eliminate the need of preliminary adaption when suppressing a rattling sound in starting an internal combustion engine from a stop state. SOLUTION: When the start request of an engine is made when a shift position is set to a parking position, pressurization torque Tp is set to a torque command Tm2* of a motor MG2 before the start of the engine (step S160), and a motor is controlled so that the torque Tp can be output from the motor MG2. Then, time change quantity dθe2/dt of an electrical angle θe2 of the motor MG2 is changed to any significant value other than a value 0 (step S140), and time change quantity dθe1/dt of an electrical angle θe1 of the motor MG1 is changed to any significant value other than the value 0 (step S150). Thus, it is possible to assume that the filling looseness of a gear mechanism between the motor MG1 and the motor MG2 is completed, and the rattling sound is put to a suppressable state. Afterwards, the start of the engine is permitted. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an internal combustion engine controller that appropriately starts the internal combustion engine loaded in a vehicle. SOLUTION: Engines ECU280 and HV_ECU320 control a throttle motor 296 so that a throttle opening does not exceed a limit value and the increase rate of the throttle opening per unit time remains at a prescribed value or smaller during a specified period after a time when an engine 120 has started. This restricts an excessive increase in the output power of the engine during the specified period. Consequently such a large shock as being felt by a driver can be avoided when starting the engine. Also since variations in air volume intake when starting the engine can be prevented, variations in exhaust emission can be prevented. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an internal combustion engine and a control device therefor, capable of reducing vibration and sound generated in starting, by reducing air filling efficiency in a cylinder by using a supercharger provided on the internal combustion engine. SOLUTION: The internal combustion engine 10 includes a supercharger 80 capable of decompressing an inside of an intake air passage 7 in a downstream thereof by operating in a direction reverse to a direction for supercharging a cylinder 5 in the intake air passage 7, ignition of air fuel mixture in the cylinder 5 is started after decompressing the inside of the intake air passage 7 in the downstream side of thereof by operating the supercharger 80 in the reverse direction at a tine of start. Since air filling efficiency to the cylinder 5 is reduced at a time of start of ignition, force and noise generated by first explosion and combustion of air fuel mixture in the cylinder 5 can be decreased. Consequently, noise and vibration generated at a time of start of the internal combustion engine 10 can be reduced. COPYRIGHT: (C)2007,JPO&INPIT