Abstract:
PURPOSE:To prevent an engine stop from occurring, by making the opening of a control valve inside a bypass passage installed so as to bypass a throttle valve, just before car stoppage in time of engine temperature being above the specified value, larger than that just before car stoppage in time of the engine temperature being less than the specified value. CONSTITUTION:An idling speed control valve 16A to be controlled by a pulse motor 16 is attached to a bypass passage 14 installed so as to bypass a throttle valve inside a suction passage. This pulse motor 16 controls feedback in order to turn an engine speed to a desired one when a feedback (FB) control condition is materialized by an electronic control circuit 44. And, when a car speed is more than the specified value, the control valve 16A is opened larger as far as the specified opening than that in time of FB control and when the car speed is below the second specified value being smaller than the said specified value, the control valve 16A is closed, whereby it is made so as to be restored to the opening in time of the FB control. And in this case, its opening just before car stoppage in time of engine temperature being more than the specified value is made larger than that in time of the engine temperature being less than the specified value.
Abstract:
PURPOSE:To secure a proper air-fuel ratio all the time as well as to prevent a worsening of drivability and a backfire from occurring, by compensating a warm-up increment value of a fuel injection quantity with cooling water temperature in time of starting. CONSTITUTION:A fundamental fuel injection quantity taup is calculated by a fundamental injection quantity operational device according to the specified driving state parameter, and a warm-up increment value f0 is calculated according to engine cooling water temperature THW, while a compensation factor f1 is found according to cooling water temperature THWO in time of starting, compensating the warm-up increment value f0 with the compensation factor f1, and the fundamental injection quantity in time of warming up is controlled for compensation. With this constitution, even after starting from what kind of water temperature, a proper air-fuel ratio is secured whereby a backfire or the like is preventable from occurring.
Abstract:
PROBLEM TO BE SOLVED: To ensure emission purifying performance of a plug-in hybrid vehicle, without giving discomfort to a user during shifting from CD mode for preferentially using a motor to CS mode for using an engine and the motor. SOLUTION: An ECU that controls a plug-in hybrid vehicle starts an engine when a required power P as a value obtained by subtracting a required discharge amount Pout from a drive power is larger than a threshold P1 and stops the engine when the required power P is smaller than a threshold P2 during intermittent control in the CD mode. When intermittent control is performed in the CD mode (YES in S100, YES in S102), the ECU limits the required discharge amount Pout to a relatively small value in a range where an engine coolant temperature THw is low, and sets the required discharge amount Pout relatively large without imposing any limitation thereon in a range where the engine coolant temperature THw is high (S116). COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a hybrid vehicle for preventing unnecessary warming-up of a catalyst converter and preventing deterioration in fuel economy. SOLUTION: A hybrid vehicle 100 is mounted with an engine 2 and a motor generator MG2 as a power source for vehicle travelling. A catalyst converter 8 is provided to an exhaust passage 7 of the engine 2. A HV-ECU 70 estimates an EV drivable distance on the basis of an SOC of an electric accumulation device B to compare the drivable distance with a travelling distance L up to the destination set by a navigation device 80. If the EV drivable distance is longer than the travelling distance L, the HV-ECU 70 outputs a control signal CTL 2 instructing inhibition of warming-up of the converter 8 to an EG-ECU 60. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress the overheating of a fuel injection valve for cylinder according to the operation of an internal combustion engine while outputting a requested power to a drive shaft even if the pressure of a fuel to the fuel injection valve for cylinder is not sufficient and the fuel injection valve cannot be used in a power output device having the internal combustion engine with the fuel injection valve for cylinder and a fuel injection valve for port and motors. SOLUTION: A fuel pressure Pf to the fuel injection valve for cylinder is less than a reference fuel pressure Pref, a vehicle requested power Pv* obtained based on a requested torque Tr* requested from the drive shaft or a power limit Pelim, whichever is smaller, is set to an engine requested power Pe* (S120, S130), and the engine and two motors are controlled so that the set engine requested power Pe* can be outputted from the engine and the requested torque Tr* can be outputted to the drive shaft while discharging a battery. Thus, while outputting the requested torque Tr* to the drive shaft, the rise of the tip temperature of the fuel injection valve for cylinder caused by operating the engine under high load can be suppressed. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To accurately detect misfire of an internal combustion engine in a hybrid vehicle. SOLUTION: This hybrid vehicle loaded with the engine and a motor determines misfire temporarily by comparing fluctuation ΔNe of engine rotation with a threshold value N1 when current running mode is engine motor running mode for running by power from the engine and the motor (S130), determines that there is possibility of misfire in the engine when fluctuation ΔNe of rotation is less than the threshold value N1 to inhibit operation of the motor to switch running mode to engine running mode for running by only power from the engine (S180), determines misfire actually by comparing the fluctuation ΔNe of engine rotation with a threshold value N2 after that (S190), and determines that the engine causes misfire when the fluctuation ΔNe of rotation is less than the threshold value N2. Consequently, misfire of the engine in the hybrid vehicle can be accurately detected. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To reduce a control load resulting from such a fact that storage in a storage means cannot be performed by a catalyst deterioration suppressing control. SOLUTION: When an input limit value WIN exceeds a limit amount WIN1 (YES in S118) when an exhaust gas purification catalyst comes within a catalyst deteriorating hot area when the requirements for fuel cut are established, i.e, the braking energy of a motor MG2 when the catalyst deterioration suppressing control is performed cannot be stored in a battery, a special control is not performed but an execution instruction for fuel cut control is outputted to an engine ECU (S110). Accordingly, a control load needed is small. In this case, since an exhaust gas temperature is lowered by an increase in OT before the input limit value WIN exceeds the limit amount WIN1, a catalyst bed temperature is lowered and, therefore, the catalyst deterioration is difficult to advance. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To promptly output power based on demands of a driver while suppressing vibration upon starting of an internal combustion engine. SOLUTION: When automatically starting an engine, upon a normal engine start, the amount of intake air is reduced by tightening the opening of a throttle valve (S140). When the driver presses down hard on the accelerator pedal, and an engine request power Pe* is a threshold value Pref or more, the throttle valve opening is an opening according to the request engine power Pe* (normal opening) and the amount of intake air is an amount corresponding to the engine demand power Pe* (S150). Cranking is performed to start the engine. Thereby, on a normal start of the engine, vibration at initial explosion can be suppressed, and when the requested engine power Pe* is large, driving power from the engine can be promptly outputted. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To restrain degradation in an engine from proceeding even though automatic start and stop of the engine are repeated. SOLUTION: Automatic stop time-period T of the engine 20 is not substantially limited before the number of times N of starting in an oil-film runout state (the number of times of starting the engine 20 in an oil-film runout state) reaches N1, but after the number of times N of starting in an oil-film runout state has reached N1, the automatic stop time-period is limited. Particularly when the number of times N of starting in an oil-film runout state has reached a threshold Nthr, the stop permissible time Tp is set at oil-film runout time limit Tlim. As a result, when the automatic stop time-period T exceeds the Tlim, the engine 20 is automatically started. When the number of times N of starting in an oil-film runout state has reached the threshold Nthr, even though the engine 20 has automatically stopped, the engine is not started in the runout oil-film state, so the engine degradation hardly proceeds. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To restrain the adjustment, accompanied with operation of an internal combustion engine from being interrupted, by enabling excessive power generated by execution of adjustment to be charged in a battery 50, and to quickly perform the adjustment by securing the opportunity of executing the adjustment. SOLUTION: When executing adjustment accompanying by operation of an engine 22, auxiliary equipment 68 is driven at its maximum possible (S205), and also at braking, the torque Tb* of mechanical brakes 64a and 64b is increased, to suppress the regenerative control of a motor MG2 (S214 and S230); the engine 22 is driven at an operation point required for adjustment (S200). COPYRIGHT: (C)2005,JPO&NCIPI