CN101284535A

CN101284535A - Torque monitoring method for hybrid electric vehicle

Info

Publication number: CN101284535A
Application number: CNA2008100937517A
Authority: CN
Inventors: 杨上东
Original assignee: SAIC Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2007-12-05
Filing date: 2008-04-18
Publication date: 2008-10-15

Abstract

The invention relates to a torque monitoring method of a hybrid electric vehicle, which comprises a safety control unit (SCU); the monitoring process of suddenly-increased torque is monitored according to parts in the safety control unit (SCU). The safety control unit (SCU) of the invention specifies in torque monitoring; at the same time, the system has the advantages of simple structure and low development cost; the monitoring method is especially suitable for control of coaxial parallel medium hybrid electric vehicle; the monitoring method can effectively avoid the dangers caused by suddenly increased engine or motor torque.

Description

A kind of torque monitoring method for hybrid electric vehicle

Technical field

The invention belongs to hybrid vehicle control field, realized the uprush monitoring of moment of torsion of hybrid power transmission system.

Background technology

Energy shock and ecological deterioration have become restriction global evolution key factor, and the automobile of research energy-saving and environmental protection is one of effective means of alleviating energy pressure, reduction environmental pollution.Hybrid vehicle has been taken into account the advantage of internal-combustion engines vehicle and pure electric automobile, has advantages such as low oil consumption, anti-emission carburetor, long travelled distance, is current practicable a kind of scheme.Because parallel type hybrid dynamic has two propulsions source, driving engine and motor, hybrid power entire car controller (HCU) need be according to current motoring condition, carrying out mode of operation judges, send power and mode request to driving engine and motor respectively then, engine controller (EMS) and electric machine controller (MCU) are controlled its propulsion source respectively to satisfy the demand of car load according to the order of entire car controller.

Yet when some extraordinary circumstances or system made mistakes, engine controller or electric machine controller may send very big torque request, and this torque condition of uprushing can be brought danger to automobile.Causing this reason of makeing mistakes may be the random error of hardware system, also might be the mistake of some systems, such as: the mistake of the mistake of software, artificial mistake, electromagnetic interference and maintenance etc.The harm of this torque condition of uprushing does not also cause enough attention on the one hand, does not have the actv. means simultaneously yet and is controlled and solve.

Summary of the invention

Purpose of the present invention just provides a kind of torque monitoring method for hybrid electric vehicle, the danger that this method energy actv. avoids driving engine or Motor torque to uprush and brought.

The method for supervising that is adopted comprises safety monitor SCU for achieving the above object, in safety monitor SCU, the monitor procedure of the moment of torsion of uprushing is implemented monitoring by part:

(1), engine torque monitoring, confirm the danger of the current moment of torsion that whether occurred uprushing;

(2), the monitoring of ISG Motor torque, confirm the danger of the current moment of torsion that whether occurred uprushing;

(3), when safety monitor SCU monitors the moment of torsion phenomenon of uprushing, will implement following controlled step:

A, close the CAN transceiver of entire car controller HCU, prevent that it from continuing to send the torque request order to engine control EMS and electric machine controller MCU;

B, send the order stop motor, continue the control motor toward the driving system output torque to prevent electric machine controller MCU to electric machine controller MCU;

C, close high tension supply.

In order to monitor the moment of torsion of transmission system, the present invention is provided with a safety monitor SCU specially, and this controller SCU only has security monitoring function, in order to handle the relevant problem of hybrid power system safety.And hybrid power entire car controller HCU, engine controller EMS, electric machine controller MCU and battery controller BMS are in order to realize the concrete function of hybrid power.The concrete function here can comprise assistive drive, generating, regenerative brake, stop and pure function such as electronic automatically, safety monitor SCU among the present invention is then specially taken charge of the duty of torque monitoring, this system is simple in structure in addition simultaneously, the advantage that cost of development is lower, the present invention is particularly suitable for the control of the hybrid hybrid vehicle of coaxial moderate in parallel.

Description of drawings

Fig. 1 is the structured flowchart of system of the present invention;

Fig. 2 is the safety detection process scheme drawing that moment of torsion is uprushed;

Fig. 3 is the particular flow sheet of safe handling.

The specific embodiment

Referring to Fig. 1, embodiments of the invention are that hybrid vehicle is a single shaft hybrid automobile in parallel, driving engine 1 and ISG motor 2 coaxial arrangement, driving engine 1 and ISG motor 2 cause drive wheel by power-transfer clutch 3 and change-speed box 4 with power transmission, and this ISG motor 2 is for generating and drive integrated the laying a foundation of function.Normally in service, entire car controller HCU7 when the dynamic demand of chaufeur, sends the power request to engine controller EMS6 and electric machine controller MCU8 by the judgement to the chaufeur driving intention respectively.Engine controller EMS6 controls driving engine 1, and electric machine controller MCU8 control inverter 9 is to realize the power demand of entire car controller HCU7.Battery controller BMS12 controls high-tension battery 13.Safety monitor SCU 11 can be monitored the current moment of torsion of ISG motor 2 by sensor 10, and engine controller EMS6 is with the current moment of torsion of monitoring engine 1.When safety monitor SCU 11 detects the situation that moment of torsion uprushes, will disconnect the CAN transceiver of entire car controller HCU7, start to stop the order of motor to electric machine controller MCU8, control high-tension battery 13 disconnects.Battery controller BMS12, entire car controller HCU7, engine controller EMS6 and safety monitor SCU 11 all are hung on the car load CAN bus.

Fig. 2 is the implementation procedure and the torque monitoring process of moment of torsion, below specifies.

The implementation procedure of moment of torsion: entire car controller HCU7 accepts the throttle signal 17 of chaufeur, location solution according to throttle disengages the torque request 18 of chaufeur under current state, the chaufeur moment of torsion of explaining is sent to torque distribution module 19, this module is carried out torque distribution according to engine condition and battery status, obtain driving engine requested torque and motor requested torque respectively, the former is sent to engine controller EMS6, realize the requested torque of car load to driving engine with control driving engine 1, the latter is sent to electric machine controller MCU8 and realizes the requested torque of car load to motor with control ISG motor 2.

The torque monitoring process: the monitor procedure of moment of torsion can be divided into the torque monitoring of driving engine 1 and the torque monitoring of ISG motor 2 again.

The torque monitoring of driving engine 1 is: the allowable torque 20 that safety monitor SCU 11 is at first tabled look-up and obtained driving engine 1 according to the rotating speed of the position of Das Gaspedal and present engine, table look-up according to the state-of-charge SOC of the position of Das Gaspedal and high-tension battery again and draw allowable torque 22 when front motor, in adder 21, two allowable torques are sued for peace then, obtain the operation moment of torsion of whole drive system, the command torque that the moment of torsion that in 23 driving system is allowed deducts motor has just obtained the final permission moment of torsion of present engine, and this value is sent to engine controller EMS6, by engine controller EMS6 the moment of torsion 16 of driving engine is monitored.Engine controller EMS6 calculates the current actual torque 14 of driving engine, follow current actual torque driving engine 1 to allow moment of torsion to compare 15 then from entire car controller HCU7, if the actual torque of driving engine 1 has surpassed the moment of torsion that allows, then think the safety problem that occurs, and send the report of safety problems to safe handling module 26.The actual torque of driving engine can be recorded via sensor 16 by engine controller EMS6, also can obtain according to the state estimation of driving engine.

The torque monitoring process of motor is: the motor command torque that safety monitor SCU 11 is accepted from entire car controller HCU7, utilization moment of torsion as motor, simultaneously according to sensor 10, electric current that obtains and information of voltage are tried to achieve the current actual torque of ISG motor 2 in 25, then actual torque is compared 24 with command torque, if the command torque of the motor that the actual torque of ISG motor 2 surpasses, then think the safety problem that moment of torsion is uprushed to have occurred, simultaneously to safe handling module 26 report safety problems.

The treating process that moment of torsion is uprushed appears in Fig. 3.Know currently when safety problem that moment of torsion uprushes having occurred when safety monitor SCU 11, can to take immediate steps prevent to bring infringement to people or car.At first in step 27, close the CAN transceiver of car load control, do not allow entire car controller HCU7 to continue outwards to send torque request, when engine controller EMS6 can't accept torque command from entire car controller HCU7, determine that then the current safety problem that occurs can control driving engine and be in safety mode.In step 28, safety governor SCU11 can send the order that stops motor to electric machine controller MCU8, prevents that electric machine controller MCU8 from continuing the control motor to the driving system output torque.In step 29, safety governor SCU11 can directly close high-tension battery 13 at last, does not allow its continuation provide the high pressure energy to car load.

Claims

1, a kind of torque monitoring method for hybrid electric vehicle the present invention includes safety monitor SCU (11), in safety monitor SCU (11), the monitor procedure of the moment of torsion of uprushing is implemented monitoring by part:

(1), driving engine (1) torque monitoring, confirm the danger of the current moment of torsion that whether occurred uprushing;

(2), the monitoring of ISG motor (2) moment of torsion, confirm the danger of the current moment of torsion that whether occurred uprushing;

(3), when safety monitor SCU (11) monitors the moment of torsion phenomenon of uprushing, will implement following controlled step:

A, close the CAN transceiver of entire car controller HCU (7), prevent that it from continuing to send the torque request order to engine controller EMS (6) and electric machine controller MCU (8);

B, send the order stop motor, continue the control motor toward the driving system output torque to prevent electric machine controller MCU (8) to electric machine controller MCU (8);

C, close high tension supply (13).

2, torque monitoring method for hybrid electric vehicle according to claim 1, it is characterized in that: driving engine (1) torque monitoring carries out according to the following steps: at first obtain the torque peak that the current state lower transmission system allows, the requested torque that this moment of torsion is deducted ISG can obtain the torque peak that driving engine under the current state (1) allows then, then this moment of torsion is sent to engine controller EMS (6), engine controller EMS (6) turns round according to measuring the actual of present engine, the permission moment of torsion that sends over hybrid power entire car controller HCU (7) compares then, when actual torque when allowing moment of torsion, then confirm the danger of the current moment of torsion that occurred uprushing.

3, torque monitoring method for hybrid electric vehicle according to claim 1, it is characterized in that: the torque monitoring of ISG motor (2) carries out according to the following steps: safety monitor SCU (11) is by being installed in the real output moment of torsion that electric current on the ISG motor (2) and voltage sensor directly calculate current I SG motor (2), read the requested torque value that entire car controller HCU (7) is sent to electric machine controller MCU (8) by the CAN bus simultaneously, at last the actual torque value of ISG motor (2) is compared with the requested torque value, if the actual torque value has surpassed the danger that the requested torque value is then confirmed the current moment of torsion that occurred uprushing.