Method for control of input power distribution in a motor vehicle with hybrid engine drive

• US 20050038577A1
• Filed: 08/10/2004
• Published: 02/17/2005
• Est. Priority Date: 08/12/2003
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG, ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: Bayerische Motoren Werke AG, ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Gebert, Jurgen, Froschl, Joachim, Dreibholz, Ralf, Kaltenbach, Johannes, Tenbrock, Friedrich, Kaindl, Markus, Frotscher, Gerd
• Granted Patent: US 7,469,169 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/11 using model predictive control [MPC] strategies, i.e. control methods based on models predicting performance utilising navigation and traffic information in the control strategy B60W20/12
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

A method for controlling and regulating the input power distribution of prime movers in a power train (1) of a motor vehicle which has one internal combustion engine (2), at least one electric machine (6, 14), at least one clutch (4, 11), the same as one transmission (12), and in which there is at least one control and regulation unit which, on the basis of predetermined, measuring and calculated values, controls and regulates the input power distribution between the internal combustion engine (2) and at least one electric machine (6, 14) with regard to power dynamics of the vehicle, the same as its energy consumption, its emission and its driving comfort. In addition, departing from a signalized input power wish, it is provided that existing nominal operating values for the operation of at least one electric machine (6, 14) is changed to new nominal operating values adapted to the actual input power wish and to changed operating situations of the vehicle and, that to determine the new nominal operating values for at least one electric machine (6, 14), the future maximum and minimum torques and outputs are precalculated, the same as the efficiency degree or losses thereof.

Claims

1-5. -5. (canceled)

6. A method for control and regulation of input power distribution of prime movers in a power train (1) of a vehicle which has at least one internal combustion engine (2), at least one electric machine (6, 14) operable as at least one of a prime mover or as a generator, at least one clutch (4, 11) and one transmission (12) and in which there is at least one control and regulation unit which, on the basis of at least one of predetermined measuring and calculated values, control and regulates the input power distribution between said internal combustion engine (2) and the electric machine (6, 14) with regard to power dynamics of the vehicle, energy consumption of the vehicle, emission and driving comfort of the vehicle wherein, departing from a signalized input power wish, existing nominal operating values for operating at least one electric machine (6, 14) are changed to new nominal operating values adapted to one or more of actual input power wish and changed operating situations of the vehicle, and that to determine the new nominal operating values for at least one electric machine (6, 14), future maximum and minimum torques and outputs, the same as one or more of the efficiency degree and losses thereof are pre-calculated.

7. The method according to claim 6, wherein for pre-calculating the future maximum and minimum torque and/or outputs, the same as the efficiency degree and/or losses, use is made of measuring values from one or several of the prior control and/or regulation cycles.

8. The method according to claim 6, wherein for precalculating theone or more of the future maximum and minimum torques and outputs, the same as the one or more of the efficiency degree and losses, an electric power loss P_verl_el of one electric machine (6, 14) is determined.

9. The method according to claim 6, wherein a new nominal operating value P_EM_Soll_mech_bg for an electric machine (6, 14) is calculated in said power train (1) according to an equation

P_—

EM_—

mech_—

Soll_—

bg=f(P_—

verl_—

el, P_—

EM_—

max, P_—

EM_—

min, P_—

SP_—

max, P_—

SP_—

min)

wherein P_verl_el stands for the actual power loss of one electric machine (6, 14), P_EM_max and P_EM_min are the electric maximum and minimum outputs of said electric machines (6, 14) and P_SP_max, the same as P_SP_min, indicate the maximum and minimum state of charge of one electric memory (10).

10. The method according to claim 9, wherein the electric power loss of the electric machine (6, 14) P_verl_el results from the following equation:

P_—

verl_—

el=(U_—

Anschl*I_—

EM−

P_—

EM_—

mech_—

1st) $\begin{array}{c}\mathrm{P\_verl}<br><br>\mathrm{\_el}=<br><br>\left(\mathrm{U\_Anschl}*\mathrm{I\_EM}-\mathrm{P\_EM}<br><br>\mathrm{\_mech}<br><br>\mathrm{\_lst}\right)*\\ <br><br>\frac{\mathrm{P\_EM}<br><br>\mathrm{\_mech}<br><br>\mathrm{\_Soll}}{\mathrm{P\_EM}-\mathrm{mech\_IST}}\end{array}$

in which U_Anschl is a connection voltage of the electric machine (6, 14), I_EM stands for an electric current in the electric machine, P_EM_mech_—

1st means a mechanical actual power and P_EM_mech_Soll is a mechanical nominal power of the electric machine (6, 14).