Abstract:
A torque response control apparatus for an electric motor of a vehicle comprises a motor torque response control means that is configured to carry out finding a difference between a required acceleration that is variable in accordance with a change of a vehicle driving condition and an actual acceleration that is obtained, at the time of the change of the vehicle driving condition, with the aid of a torque characteristic of the electric motor, the difference being caused by the torque characteristic of the electric motor in which the maximum torque is varied in accordance with a rotation speed of the electric motor; and controlling the torque response of the electric motor in a manner to cause a driver to feel the difference of the actual acceleration from the required acceleration to be small by compensating the difference between the required acceleration and the actual acceleration.
Abstract:
A vehicle speed VSP enters a creep-cutoff-prohibiting speed region lower than V1 with a forward creep torque being outputted (t1), and then this state continues for a time duration set corresponding to a timer value NTM1 (t2). At this time, a creep cutoff is prohibited by setting a creep-cutoff-prohibition flag NFLAG at “1”. A braking force becomes larger than or equal to a creep-cutoff-permitting braking-force value to satisfy a creep-cutoff permitting condition related to the braking force (t3) while a creep-cutoff permitting condition related to the vehicle speed has been satisfied because of almost zero of the vehicle speed VSP. In response thereto, the creep-cutoff permitting flag FLAG is set at 1 at t4. However, the creep toque continues to be outputted also after t4 without the creep cutoff, so that a torque reduction accompanied with strangeness feeling can be prevented.
Abstract:
In an electrically driven vehicle propelled by an electric machine (motor)equipped with a collaborative braking system of regenerative and frictional braking capacities, in order to achieve the “rollback prevention” at starting on an sloping road, when the regenerative braking is not available due to charging restriction to battery, frictional braking is used instead of regenerative braking and wheels are (automatically, i.e. not manually by driver) braked with friction to prevent the rollback. Moreover, in addition to braking wheels by frictional braking, further control is performed to adjust and match the magnitude of frictional braking force to a braking force in accordance with the starting operation. Thus, at the time of rollback prevention by the frictional braking as well, the similar prevention of rollback will be possible as the prevention by way of regenerative braking such that the effect of rollback prevention may be achieved without a feel of discomfort.
Abstract:
A vehicle speed VSP enters a creep-cutoff-prohibiting speed region lower than V1 with a forward creep torque being outputted (t1), and then this state continues for a time duration set corresponding to a timer value NTM1 (t2). At this time, a creep cutoff is prohibited by setting a creep-cutoff-prohibition flag NFLAG at “1”. A braking force becomes larger than or equal to a creep-cutoff-permitting braking-force value to satisfy a creep-cutoff permitting condition related to the braking force (t3) while a creep-cutoff permitting condition related to the vehicle speed has been satisfied because of almost zero of the vehicle speed VSP. In response thereto, the creep-cutoff permitting flag FLAG is set at 1 at t4. However, the creep toque continues to be outputted also after t4 without the creep cutoff, so that a torque reduction accompanied with strangeness feeling can be prevented.
Abstract:
A throttle actuator varies an actual throttle valve opening degree for an engine in response to a control signal independently of driver's accelerator operation. An engine control unit determines a target torque (or a variable quantity representing the target torque) in accordance with an accelerator opening degree, and normally controls the actual throttle opening degree in a normal mode based on the target torque. In a predetermined operating region where the throttle opening responds too sensitively to a change in the target torque, the control unit controls the throttle opening degree in a constraint mode in accordance with a parameter, such as the accelerator opening degree, independent of the target torque.
Abstract:
An engine comprising a throttle controller operable in response to an intake air control command, a fuel controller operable in response to a fuel control command, and an engine controller for generating the intake air control command and the fuel control command. The engine controller determines a target equivalence ratio for detected operating state of the engine, controls a change between stratified charge combustion and homogeneous charge combustion, delays the target equivalent ratio, determines the intake air control command and the fuel control command in response to the delayed target equivalence ratio.
Abstract:
A torque controller for a direct-injection type internal combustion engine achieves the target engine torque accurately, without being affected by the combustion mode. The combustion efficiency is different depending on whether an engine combustion mode is in a homogeneous combustion mode or a stratified combustion mode. The torque controller calculates an eventual target intake air flow rate TTP2 based on the target intake air flow rate TTPO, the target air/fuel ratio tDML, and the combustion efficiency correction rate ITAF, which is calculated based on the combustion mode.
Abstract:
A cylinder direct injection spark-ignition internal combustion engine comprising an EGR system is provided to control an amount of EGR gas recirculated from an exhaust gas passage to an intake air passage in which a throttle valve is disposed. The EGR system includes an EGR passage connecting the exhaust gas passage and the intake air passage, and an EGR valve disposed in the EGR passage. A control system is provided to control the EGR valve and the throttle valve. The control system includes a section for calculating a fresh air amount conversion value of an amount of the EGR gas, the fresh air amount conversion value being an amount of fresh air to be introduced to the intake system through the EGR system in place of the amount of the EGR gas. The control system further includes a section for controlling respective opening degrees of the throttle valve and the EGR valve in accordance with the fresh air amount conversion value.
Abstract:
A battery charging system includes a battery, a load and a controller to control supply power to be supplied from an external power source to the battery and the load, in accordance with a request charging power and a request load power. The controller limits power supplied from the external power source to the battery to an allowable battery power, and distributes the supply power from the external power source between the battery and the load in a state holding limitation of limiting the supply power from the external power source to the allowable battery power when a request for the supply of power to the load is generated.
Abstract:
When a non-running range is changed into a running range at timing t2 during the execution of creeping-cut (t1˜t4), a flag FLAG is set at 1 and a timer T is reset. Then, the timer T is incremented to measure a time elapsed from timing t2. If the running range is a forward range, an electric motor outputs a play-reducing torque in a forwardly rotational direction as shown by a solid line for a time period between timing t2 and timing t3 for which the timer T is smaller than a set time T1, because the flag FLAG indicates 1. If the running range is a reverse range, the electric motor outputs the play-reducing torque in a reversely rotational direction as shown by a dotted line, because the flag FLAG indicates 1.