Method for controlling series hybrid vehicle, and series hybrid vehicle

Patent metadata

Field	Value
Publication number	US-2022363239-A1
Application number	US-202017628915-A
Country	US
Kind code	A1
Filing date	Jul 29, 2020
Priority date	Jul 29, 2020
Publication date	Nov 17, 2022
Grant date	—

Abstract

A control method controls a series hybrid vehicle in which a drive motor and an internal combustion engine are supported in a vehicle body via a plurality of mount members in an integrated state. The control method using a controller generates electric power using an electric power generation motor, and drives the electric power generation motor using motive power of the internal combustion engine. The control method drives a drive wheel with the drive motor using the generated electric power, and causes the drive motor to generate regenerative torque during deceleration. In the control method, the regenerative torque is generated by the drive motor such that an upper limit of the regenerative torque is restricted to a magnitude at which an engine rotational speed where resonance occurs on the vehicle body floor.

First claim

1 . A control method for controlling a series hybrid vehicle having a drive motor and an internal combustion engine supported in a vehicle body via a plurality of mount members in an integrated state, the method using a controller comprising:
driving an electric power generation motor by motive power of the internal combustion engine to generating electric power by the electric power generation motor; using the electric power generated to drive the drive motor to drive a drive wheel; and generate a regenerative torque by the drive motor in response to a deceleration request during deceleration, wherein the regenerative torque is generated by the drive motor such that an upper limit of the regenerative torque is restricted to a magnitude at which a floor vibration generation region, which is an engine rotational speed region where resonance occurs on the vehicle body floor and is determined based on the upper limit of the regenerative torque, is lower than an engine rotational speed of the internal combustion engine when the electric power generation motor generates the electric power in a state where the regenerative torque is generated.

2 . The series hybrid vehicle control method according to claim 1 , further comprising
calculating a spring constant of an engine mount, which is one of the plurality of mount members, for a case where a combustion excitation force frequency at an upper limit rotational speed of the internal combustion engine during generation of the electric power and a characteristic frequency of the internal combustion engine elastically supported by the engine mount are equal; calculating a compression amount of the engine mount when the calculated spring constant is employed; and setting a torque of the drive motor when the compression amount is employed as a regenerative torque upper limit value.

3 . The series hybrid vehicle control method according to claim 2 , wherein
the regenerative torque upper limit value is reduced as the upper limit rotational speed decreases.

4 . The series hybrid vehicle control method according to claim 2 , wherein
the compression amount of the engine mount increases as the regenerative torque increases; and the floor vibration generation region becomes a higher engine rotational speed region as the compression amount of the engine mount increases.

5 . A series hybrid vehicle comprising:
an internal combustion engine; an electric power generation motor that is driven by motive power of the internal combustion engine; a drive motor that is driven by electric power generated by the electric power generation motor; and a controller that performs a control so as to cause the drive motor to generate regenerative torque in response to a deceleration request during deceleration, the drive motor and the internal combustion engine being supported in a vehicle body via a plurality of mount members in an integrated state, wherein the controller restricts an upper limit of the regenerative torque to a magnitude at which a floor vibration generation region, which is an engine rotational speed region where resonance occurs on the vehicle body floor and is determined based on the upper limit of the regenerative torque, is lower than an engine rotational speed of the internal combustion engine when the electric power generation motor generates the electric power in a state where the regenerative torque is generated, and causes the regenerative torque to be generated by the drive motor.

Assignees

• Nissan Motor

Inventors

• Hoshi Kiyoshi
• Nakamura Yohei
• Kobayashi Azusa

Classifications

• B60W20/17 Primary

  for noise reduction · CPC title

• B60W20/14

  in conjunction with braking regeneration · CPC title

• B60W10/06

  including control of combustion engines · CPC title

• B60K6/46 Primary

  Series type · CPC title

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title