Abstract:
PROBLEM TO BE SOLVED: To control an engine operation characteristic changing means to cope with generation of unwelcome intake compression ratio increased lock, in the engine operation characteristic changing means capable of variably controlling an intake compression ratio and being locked to an operation state for enhancing the intake compression ratio by a lock means. SOLUTION: When the engine operation characteristic changing means should not be in the operation state for enhancing the intake compression ratio, whether or not there is a possibility of the locking means locking the changing means to the operation state is determined. When the possibility of the locking is predicted, countermeasures for preventing the locking operation are taken.
Abstract:
PROBLEM TO BE SOLVED: To start an internal combustion engine for an automobile possible to control to increase an intake air compression ratio before performing the cranking for facilitating a start of the internal combustion engine in the cold temperature condition as quickly as possible without generating vibration and increasing the intake compression ratio as long as capacity of a capacitor as a cranking power source allows. SOLUTION: An effective output of the capacitor for a cranking motor is the predetermined output threshold value showing the excellent capacity condition or more is judged, and when the effective output is more than the predetermined output threshold value, cranking is performed without increasing the intake air compression ratio independently of the engine temperature.
Abstract:
PROBLEM TO BE SOLVED: To prevent an engine stall without increasing an engine rotational speed to any higher level than required. SOLUTION: An engine stall is estimated in accordance with stall estimation criteria determined in advance (R1-3), and if the estimated number of times (counter snestp) reaches a determining value CNESTP1, a target rotational speed of an engine netag is raised by only a compensation quantity neup so that the engine stall is not easily caused when the engine is started afterward (R1-7). On the other hand, if a prescribed restoring condition is satisfied (decision of R1-8 is YES), the compensated target rotational speed of the engine netag is returned back to the original by the compensation quantities neup (R1-9).
Abstract:
PROBLEM TO BE SOLVED: To provide a controller for a power train capable of suppressing change of a driving force of a vehicle without depending on other driving force source when a predetermined driving force source causes a failure. SOLUTION: In this controller for the power train constituted such that it has an engine and a motor generator, a fuel injection device, an ignition device, an electronic throttle valve, an actuator, an intake valve, and a valve timing actuator are provided to control an engine output, and the motor generator is driven by electric power generated by power of the engine, an output control means (step S1 or step S3) controlling a normal output controller to suppress the reduction of an engine output accompanied with a failure of an output controller when any of a plurality of output controllers causes the failure is provided.
Abstract:
PROBLEM TO BE SOLVED: To reduce a speed reduction shock at shift operation time of a non- continuous variable transmission. SOLUTION: An HVECU 34 calculates the timing when the non-continuous variable transmission 16 starts an automatic shift, and gradually reduces a torque assist by motor torque Tm by an MG 18 before starting the shift via an MGECU 30, and reduces a torque difference generated when engine torque Te disappears by disengaging a friction clutch 14 at shift time, and reduces a shift time shock by moderating a gradient of a torque change.
Abstract:
PROBLEM TO BE SOLVED: To reduce or eliminate shock and vibration generated in coupling operation of a coupling mechanism when an operation of an internal combustion engine is started. SOLUTION: In a case where rotating speed Nm of a motor 14 for driving an auxiliary machine is higher than prescribed rotating speed N1, inversion phase current is inputted to the motor 14, and rotating operation of the motor 14 is braked. When the rotating speed Nm of the motor 14 attains the prescribed rotating speed N1 and less, a solenoid clutch 15 is coupled, the rotating speed of the engine 10 is increased to rotating speed of a starting time by the motor 14, fuel is supplied, spark ignition is executed, the engine 10 is restarted, and then, the operation of the engine 10 is restarted.
Abstract:
PROBLEM TO BE SOLVED: To optimumly control closing timing of an intake valve at the stop and start of an internal combustion engine and to attain smooth and quick starting of the internal combustion engine. SOLUTION: In this valve timing control device to be used for a power output device provided with a timing adjusting mechanism capable of adjusting closing timing of an intake valve of an internal combustion engine within a prescribed adjusting angle range, a stopping time control means for setting closing timing of the timing adjusting mechanism to a foremost advancing angle position when a stopping of the internal combustion engine is requested, a stopping history determining means for determining whether a stopping operation (an IG.OFF operation, for instance) based on the will of a driver exists or not between starting of previous time and starting of this time when a starting of the internal combustion engine is requested and a starting time control means for setting closing timing of the timing adjusting mechanism to a foremost lag angle position when the internal combustion engine is started.
Abstract:
PROBLEM TO BE SOLVED: To reduce shocks caused by the fluctuations of a vehicle drive force at gear change in a power plant which has a transmission with a limited number of gear ratios. SOLUTION: A power plant for a vehicle has a motorgenerator provided downstream of a transmission. Drop in a vehicle drive force (corresponding, for instance, to a region B12) which is produced when the transmission is in operation, i.e., when the output of an engine is not transmitted, is compensated by a power generated by the motorgenerator. The difference between the vehicle drive forces before and after the gear change (corresponding, for instance, to a region A12) is compensated for by the power generated by the motorgenerator. By the increase of the vehicle drive force generated by the motorgenerator, the curve of the vehicle drive force can be smoothed and shocks produced at gear change time can be reduced.
Abstract:
PROBLEM TO BE SOLVED: To provide a cooling control device for an internal combustion engine capable of sufficiently cooling the internal combustion engine in a hybrid vehicle. SOLUTION: In the case of the engine temperature of an internal combustion engine 1 being higher than the specified temperature when driving driving wheels 6 using only the driving force of an MG 3, a control device 11 controls power dividing mechanism 4 to forcibly drive the internal combustion engine 1 by an MG 2 or the MG 3, or sets a change-over operating condition to an operating condition low in engine speed or vehicle speed, or stops fuel supply to a fuel injector 14 at higher engine speed to stop fuel supply to the internal combustion engine 1 and rotates the internal combustion engine 1.
Abstract:
PROBLEM TO BE SOLVED: To determine a desirable method for engine operation in a hybrid car. SOLUTION: An engine 150 is started/stopped by judgment values different depending on a shift range detected by a shift position sensor 184. Judgment values for the start/stop of the engine 150 are set so that the engine 150 may be easier to start especially in PARKING and REVERSE ranges, and by a running condition and SOC of a battery 194 in DRIVE range. Besides, the judgment values in DRIVE range are set to higher values than those in another range in some cases.