METHOD FOR CONTROLLING THE HYBRID DRIVE OF A MOTOR VEHICLE AND CONTROL SYSTEM
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Abstract
With a method and a device for controlling the hybrid drive of a motor vehicle, having the components: internal combustion engine (ICE), shift transmission (ST), at least one electric machine (EMi), at least one clutch (Cj) and an energy store (ES), and at least one driven axle (RA; FA), it is sought to obtain the maximum efficiency and service life of the components. For this purpose,
- it is decided which operating modes (AMK) are possible on the basis of the driver demand (DD) and of the operating state,
- for the possible operating modes (AMK), it is decided which transmission gears (Gj) are possible, such that a greater number of modes (AMGK) are available for selection,
- for all of said modes (AMGK), operating points corresponding to the driver demand are determined taking into consideration the operating state and system state (SSA),
- the modes (AMGK) are evaluated, and the mode (AMGK*) that is evaluated as being the most favorable is selected.
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Citations
69 Claims
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1-57. -57. (canceled)
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58. A method for controlling the hybrid drive of a motor vehicle, which hybrid drive comprises the following components:
- an internal combustion engine (ICE), a multi-step transmission (ST), an axle drive gearing (RAD), at least one electric machine (EM1;
EM1, EM2), at least one clutch (Cj) and at least one energy store (ES), and at least one driven axle (RA;
FA;
RA, FA), comprising the steps of;a) calculating at least one required torque corresponding to the driver demand (DD) on the basis of data that describes the driver demand (DD), the operating state of the motor vehicle and the system state (SSA), b) determining on the basis of said data, which describes at least one torque and the operating state of the motor vehicle and the system state (SSA), from all modes, the possible modes (AMGK) and transmission stages (G), c) determining for said possible modes (AMGK), optimum operating points (OP), which correspond to the driver demand (DD), of the components involved in the individual respective modes taking into consideration the operating state and system state (SSA), d) wherein, for the calculation of the optimum efficiencies (η
ICE, η
EM1, η
EM2) and operating points (OP) of the possible modes (AMGK), firstly, the limit values of the maximum torque of individual machines (ICE, EM1, EM2) are calculated for each gear stage (G) taking into consideration the mechanical configuration and the transmission ratios (Ü
ST, Ü
FAD, Ü
RAD),then, for all modes (AMGK), the optimum operating points (OP) of the individual machines (ICE, EM1, EM2) are determined taking into consideration limit values, and, for said operating points (OP), the individual efficiencies (η
ICE, η
EM1, η
EM2) and, resulting from these, the overall efficiencies (η
AMGK) for all the possible modes are determined,e) then evaluating the modes (AMGK) are evaluated, with the overall efficiency being one of a number of evaluation criteria, and the mode (AMK*) that is evaluated as being the most favorable is selected, f) finally, outputting nominal values or commands, which correspond to the operating points (OP) of the selected mode (AMK*), for fulfilling the driver demand (DD) for the adjustment of the components (ICE, EM1, ES;
ICE, EM1, EM2, ES) involved in the respective mode (AMK*). - View Dependent Claims (59, 60, 61, 62, 63, 64)
- an internal combustion engine (ICE), a multi-step transmission (ST), an axle drive gearing (RAD), at least one electric machine (EM1;
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65. A control system for a motor vehicle with a hybrid drive which is composed of the following components:
- an internal combustion engine (ICE), a multi-step transmission (ST), at least one axle drive transmission (RAD;
FAD;
FAD, RAD), at least one electric machine (EMi), at least one clutch (Cj), an energy store (ES) and at least one driven axle (RA;
FA;
RA, FA), with a driver demand evaluation (DD) detecting, from the throttle pedal position, the brake pedal position and a wheel rotational speed, the operating state (acceleration, deceleration, kickdown, etc.) that the driver wishes to attain, and a hybrid controller determines the nominal values or commands to be set at the components, and a torque coordinator (M16) assigns the nominal values and commands for the activation of the components to said components and converts said nominal values and commands into actuating variables for the control of said components, the hybrid controller (HCU) comprises;a) a system state analysis module (SSA) (M1) that, with present variables (vVehicle, TICE, etc.) that describe the operating state, carries out preliminary calculations and stores the results thereof (ω
ICE, ω
EMi, FlagStarting, FlagBraking),b) a driving dynamics controller (FD) that, from the driver demand (DD) and the present operating state of the vehicle, calculates and stores the at least one torque (MFA;
MRA;
MFA, MRA) that is required at the at least one axle in order to fulfill the driver demand,c) a number of further modules that, from the variables stored by the system state analysis module (SSA) (M1) and by the driving dynamics controller (FD), determine possible modes (AMGK) and optimum operating points (OP) of the components in said modes (AMGK), and after the evaluation of the modes (AMGK), select the most favorable drive mode (AMGK*) and generate the nominal values for the optimum operating points of the components in the selected mode (AMGK*). - View Dependent Claims (66, 67, 68, 69)
- an internal combustion engine (ICE), a multi-step transmission (ST), at least one axle drive transmission (RAD;
Specification