Mazda Motor Corporation

Mazda Motor Corporat Ion

Atsushi Yagi

Kenji Sasaki

Tomokuni Kusunoki

Hironori Kokubu

Naoki Yamada

Yoh Yamazaki

Masao Inoue

Nobuyuki Sakata

An engine system provided to a vehicle having an accelerator pedal is provided. When an engine operation range is determined to shift to a first range (where an electromagnetic clutch is disengaged) from a second range (where the clutch is engaged) after an opening of the accelerator pedal increases at a rate below a given reference rate, the clutch is switched from ON to OFF after a given basic stand-by period passes from the shift. When the engine operation range is determined to shift from the second range to the first range after the accelerator pedal opening increases at the given reference rate or above, the clutch is switched from ON to OFF after a given acceleration stand-by period (longer than the basic stand-by period by a given added period) passes from the shift.

Engine system

An engine system is provided, which includes a supercharger driven by a crankshaft of an engine, an electromagnetic clutch disconnectably connecting the crankshaft to the supercharger, and a controller configured to output a control signal to the electromagnetic clutch. The controller includes a processor configured to execute an uphill-angle detecting module to detect an uphill angle during traveling of a vehicle, an uphill determining module to determine whether the detected uphill angle is above a given first uphill angle, and a boost controlling module to, when the detected uphill angle is above the first uphill angle, control the electromagnetic clutch to connect the crankshaft to the supercharger even when a target torque of the engine is within a not-boosting range.

A vehicle control system is provided, which includes an operating amount detector configured to detect an operating amount by an operator, of an operation mechanism comprising at least one of an accelerator pedal and a brake pedal, a speed detector configured to detect a vehicle traveling speed, a reaction-force generator configured to generate a reaction force of the pedal, and a controller. The controller includes a processor to execute an acceleration calculating module to calculate an acceleration based on the traveling speed and the operating amount, a rigidity characteristic setting module to set the reaction force so that a rigidity value that is a ratio of the reaction force to the operating amount increases as the acceleration increases, and a reaction-force control module to control the reaction-force generator so that the reaction force generated by the reaction-force generator becomes the reaction-force value set by the rigidity characteristic setting module.

Control system for vehicle

A control device for an engine includes an accelerator opening detector for detecting an opening of an accelerator, a target acceleration setter for setting a target acceleration of a vehicle based on the accelerator opening detected by the accelerator opening detector, and an engine controller for adjusting an engine torque to achieve the target acceleration set by the target acceleration setter. When the accelerator opening is increased from a state where the target acceleration is set to zero, the target acceleration setter sets the target acceleration according to the accelerator opening to produce a highest jerk in the vehicle at an accelerator opening that is larger by 5 to 10% than an accelerator opening corresponding to the state where the target acceleration is set to zero.

Control device for engine

A control device for an engine is provided. The control device includes an accelerator opening detector for detecting an opening of an accelerator, a target acceleration setter for setting a target acceleration of a vehicle based on the detected accelerator opening, and an engine controller for adjusting an engine torque to achieve the set target acceleration. The target acceleration setter sets the target acceleration such that a characteristic of a change of a jerk produced in the vehicle due to a reduction of the accelerator opening correlates to a characteristic of a change of a jerk produced in the vehicle due to an increase of the accelerator opening, the increase of the accelerator opening performed in an early half of a process of acceleration to a constant speed travel of the vehicle, the reduction of the accelerator opening performed in a latter half of the process.

A control device for an engine, which controls an engine torque based on operation of an organ-type accelerator pedal is provided. The control device includes an accelerator opening detector for detecting an accelerator opening based on an angle of an accelerator pedal, a target acceleration setter for setting a target acceleration based on the accelerator opening, and an engine controller for adjusting an engine torque to achieve the target acceleration. The accelerator pedal is arranged to have a pedal angle at a predetermined initial pedal angle when the accelerator pedal is not pressed. The target acceleration setter sets the target acceleration to zero when the accelerator pedal is pressed and the accelerator opening is within a range where a difference between the pressed pedal angle and the initial pedal angle is between 2 and 4 degrees.

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Hiroshima, Japan

Atsushi Yagi