Method for accelerating a hybrid vehicle

Patent metadata

Field	Value
Publication number	US-10654469-B2
Application number	US-201816043523-A
Country	US
Kind code	B2
Filing date	Jul 24, 2018
Priority date	Jun 27, 2012
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A method for accelerating a vehicle driving forward, in which the vehicle has a propulsion system including a combustion engine with an output shaft (2a), a gearbox (3) with an input shaft (3a), an electric machine (9) comprising a stator and a rotor, and a planetary gear comprising a sun gear (10), a ring gear (11) and a planet wheel carrier (12). When accelerating the vehicle the torque of the electric machine is controlled and the rotational speed of the combustion engine is controlled until the components of the planetary gear have the same rotational speed and may be interlocked.

First claim

What is claimed is:

1. A method for accelerating a vehicle driving forward, wherein the vehicle has a propulsion system comprising a combustion engine with an output shaft, a gearbox with an input shaft, an electric machine comprising a stator and a rotor, and a planetary gear comprising three components in the form of a sun gear, a ring gear and a planet wheel carrier;
the output shaft of the combustion engine is connected to one of the three components of the planetary gear so that rotation of the output shaft causes rotation of the one of the three components, the input shaft of the gearbox is connected to another one of the three components of the planetary gear so that rotation of the input shaft causes rotation of the another one of the three components, and the rotor of the electric machine is connected to the remaining one of the three components of the planetary gear so that rotation of the rotor causes rotation of the remaining one of the components;
the propulsion system further comprising locking means comprising a displaceable positive coupling member transferable to a locking position to connect the output shaft of the combustion engine to at least one of the three components to interlock two of the three components, so that the three components rotate with the same rotational speed, and a releasing position in which the coupling member is disconnected from the at least one of the three components to allow the three components to rotate with different rotational speeds;
the method comprising:
accelerating the vehicle when the vehicle is being driven forward by,
a) controlling the electric machine to deliver a torque corresponding to a product of the propulsion system torque requested for the acceleration and a transmission ratio of the planetary gear with the locking means in the releasing position,
b) with the locking means in the releasing position and at the same time as step a) measuring a first rotational speed of the input shaft of the gearbox and controlling the combustion engine with an electric control unit to increase the rotational speed of the combustion engine in the direction towards the first rotational speed, and
c) transferring the locking means from the releasing position to the locking position when the rotational speed (n 1 ) of the combustion engine is substantially equal to the first rotational speed (n 2 ).

2. A method according to claim 1 , further comprising in step b), measuring the rotational speed (n 2 ) of the input shaft of the gearbox and controlling the combustion engine to change its rotational speed (n 1 ) in the direction towards the rotational speed of the input shaft.

3. A method according to claim 1 , further comprising starting the method in a state of the propulsion system with a rotational speed (n 1 ) of the combustion engine being lower than the first rotational speed (n 2 ).

4. A method according to claim 1 , further comprising in step c) interlocking the sun gear and the planet wheel carrier.

5. A computer program product comprising a non-volatile data storing medium readable by a computer the data storing medium storing a computer program comprising computer program code which causes a computer to implement a method according to claim 1 when the computer program code is executed in the computer.

6. An electronic control unit of a motor vehicle comprising execution means, a non-volatile memory connected to the execution means and a data storing medium connected to the execution means, and the computer program code of a computer program product according to claim 5 is stored on the data storing medium.

7. A vehicle comprising an electronic control unit according to claim 6 .

Assignees

• Scania Cv Ab

Inventors

• Pettersson Niklas
• Bergquist Mikael
• Lindström Johan
• Kjell Anders
• Björkman Mathias

Classifications

• B60W2510/1015

  Input shaft speed, e.g. turbine speed · CPC title

• B60W30/18027

  Drive off, accelerating from standstill · CPC title

• B60W10/115

  with planetary gears · CPC title

• B60W2710/083

  Torque · CPC title

• B60K6/365 Primary

  with the gears having orbital motion · CPC title