CN111942180A

CN111942180A - Multi-mode intelligent starting strategy control method for range extender

Info

Publication number: CN111942180A
Application number: CN202010667040.7A
Authority: CN
Inventors: 舒涌; 李鹏; 汪敏; 赖发东
Original assignee: Hangzhou Heri New Energy Technology Co ltd
Current assignee: Hangzhou Heri New Energy Technology Co ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2020-11-17

Abstract

The invention provides a multi-mode intelligent starting strategy control method for a range extender, which comprises the following steps: 1) selecting a starting mode, and executing the step 2; 2) if the range extender RE has no shutdown fault, the key is opened, no collision signal indication exists, no collision output signal exists, the VCU is started, the range extender controller RCU issues a starting instruction according to the starting mode selected in the step 1, and the engine ECU is started; 3) judging whether the starting is successful: after the engine ECU reaches the judgment condition of successful starting, delaying for a period of time; if the engine ECU also meets the judgment condition of successful starting, the starting is successful; otherwise, the range extender controller RCU is stopped and restarted. The starting modes of the multi-mode intelligent starting strategy control method for the range extender comprise large motor starting and small motor starting, different starting modes are selected according to different conditions, the starting modes are various, starting smoothness is good, starting success rate is high, and energy consumption is low.

Description

Multi-mode intelligent starting strategy control method for range extender

Technical Field

The invention relates to research on a multi-mode intelligent starting strategy control method of a range extender, in particular to a multi-mode intelligent starting strategy control method of a range extender. The starting strategy of the range extender is researched, and the characteristics of the range extender such as starting smoothness, starting success rate and energy consumption are improved by coordinating the methods of the motor reverse-dragging rotating speed, the engine starting rotating speed, the motor driving quitting strategy and the like.

Background

A range extender in the conventional sense refers to a combination of an engine and a generator. The range-extended electric vehicle is an electric vehicle which uses other energy sources (such as gasoline) to supply electric energy under the condition that the electric quantity of a battery is exhausted. The main working characteristics are that the electric vehicle works in a pure electric mode under most conditions, and works in a range extending mode under few conditions, namely, the range extender generates electric energy to provide driving of the electric vehicle or charge a battery.

The existing range extender has the problem of single starting mode:

1. the traditional engine starting technology is adopted, the small motor is started, the energy consumption is high, and the starting success rate is low;

2. the engine is driven by the generator to start, and the starting smoothness is poor.

Accordingly, there is a need for improvements in the art.

Disclosure of Invention

The invention aims to provide a multi-mode intelligent starting strategy control method of a range extender with high starting smoothness.

In order to solve the technical problem, the invention provides a multi-mode intelligent starting strategy control method for a range extender, which comprises the following steps:

1) selecting a starting mode, and executing the step 2;

2) if the range extender RE has no shutdown fault, the key is opened, no collision signal indication exists, no collision output signal exists, the VCU is started, the range extender controller RCU issues a starting instruction according to the starting mode selected in the step 1, and the engine ECU is started;

3) judging whether the starting is successful:

after the engine ECU reaches the judgment condition of successful starting, delaying for a period of time; if the engine ECU also meets the judgment condition of successful starting, the starting is successful; otherwise, the range extender controller RCU is stopped and restarted.

As an improvement of the multi-mode intelligent starting strategy control method of the range extender, the method comprises the following steps:

the starting mode of the step 1 comprises a small motor starting mode or a large motor starting mode;

in the small motor starting mode, the target torque of the large motor is 0, and in the direct power generation mode;

in a large motor start mode: the large motor target torque is obtained by looking up a table according to the water temperature of the engine and the current rotation speed in the electric mode and in the large motor starting mode.

As a further improvement of the multi-mode intelligent starting strategy control method of the range extender, the method comprises the following steps:

under normal conditions, the method is a large motor starting mode, namely, a generator reversely drags an engine to start;

and when the power battery is insufficient in electric quantity or fails to output power, a small motor starting mode is adopted.

the issuing starting instruction in the step 2 is as follows: the engine is started by a rotational speed torque command to be sent to the generator GCU or the engine ECU.

in step 3, if the engine is started successfully, the engine ECU enters an idle mode, and the VCU has a power request and is switched to a power generation state; if the starting fails, the restarting and starting times are a calibration value, and power failure recovery is needed when the starting times are exceeded.

the VCU can be started, and the VCU state signal is low-voltage standby, and high-voltage on the whole vehicle, small motor starting, large motor starting or range-extended power generation is completed.

and step 2) is realized through a start-stop module, and the start-stop module determines the start and stop of the range extender RE according to signals given by the vehicle control unit VCU and the range extender controller RCU.

the start-stop module comprises:

RE has no shutdown fault (RE fault state REFaultSts is not 3-shutdown fault), key on (key signal RCU _ KeyStatus of RE is key on signal), no collision signal indication (collision signal CrashStatus is 0-no collision signal indication), no collision output signal (collision output signal CrashOutputStatus1 is 0-no collision output signal), state of VCU is one of 1, 4, 5, 6, 7 (state signal vcuss of VCU is enabled);

REFaultSts<＝2、RCU_KeyStatus＝＝1、CrashStatus＝＝0、CrashOutputStatus1＝＝0、VCUSts＝＝1、4、5、6、7；

when the conditions are all satisfied, the REStartCmd is set to be 1, the state machine in the RCU is switched to a large motor starting state or a small motor starting state from a high-voltage standby mode, a starting instruction is executed, if not, the REStartCmd is always 0, and the range extender RE is not started.

step 3) judging whether the starting is successful:

if the RE starting/stopping pulse signal VCUReCom given by the VCU of the whole vehicle controller is detected to be 1-small motor starting, 2-large motor starting or 3-range-extended power generation, the state is transferred to be StopToStart, and a corresponding starting mode is executed; if the judgment condition of successful starting is met, then the delay of C _ StartTimeUp is passed, and the judgment condition of successful starting is met, then the Start _ Cmd is true, and the starting flag bit is started; otherwise, the Start _ Cmd is false, and the starting flag bit is shutdown;

if the RE Start/stop pulse signal VCUReCom given by the vehicle control unit VCU is detected to be 4 or 5, the state transitions to startstop, if the C _ StartTimeUp delay is passed, VCUReCom still remains to be one of 4 or 5, the Start _ Cmd is false, and the Start flag bit is off; otherwise, the Start _ Cmd is true, and the Start flag bit is Start;

if the Start _ Cmd is true, the range extender is required to be started, and the subsequent starting operation is executed.

The technical problem to be solved by the invention is as follows:

1) and a starting control mode:

1.1), starting a small motor: issuing a starting instruction according to a temperature table look-up starting model to assist in starting the model, wherein the mode is adopted when the power battery limits power output or fails to output power;

1.2) starting the generator in a reverse dragging manner;

2) selecting which mode to start according to the starting mode;

when the power battery is insufficient in electric quantity or fails to output power, a small motor starting mode is adopted, namely a small motor starts the range extender;

3) and switching the starting state to be sent to the ECU and the GCU in real time.

When the system is started, the ECU and the GCU can report starting states (message updating period is 10ms and 20ms) at any time, such as information of rotating speed, current, torque, success or failure of starting and the like, and the RCU judges a starting stage and whether the starting is successful or not according to the information;

if the starting is unsuccessful, the machine is shut down and restarted, the starting times are a calibration value, and the power failure recovery is needed when the starting times are exceeded (the power failure recovery is needed when the three-level fault occurs);

successful start-up will transition to idle mode (when VCU has no power request) depending on the transition state, and will switch to power generation if VCU has a power request.

The multi-mode intelligent starting strategy control method of the range extender has the technical advantages that:

the starting modes of the multi-mode intelligent starting strategy control method for the range extender comprise large motor starting and small motor starting, different starting modes are selected according to different conditions, the starting modes are various, starting smoothness is good, starting success rate is high, and energy consumption is low.

When the invention judges whether the starting is successful, after the judgment condition of successful starting is met, the invention judges whether the judgment condition of successful starting is met again through delay, thereby effectively reducing misjudgment operation and providing the accuracy for judging whether the starting is successful.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

FIG. 1 is a block schematic diagram of a start stop module;

FIG. 2 is a functional logic block diagram of a start stop module;

fig. 3 is a schematic diagram of start-stop mode selection.

Detailed Description

The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.

Embodiment 1, a method for controlling a multi-mode intelligent start strategy of a range extender, as shown in fig. 1 to 3, includes the following steps:

1) selecting a starting mode, namely selecting a small motor starting mode or a large motor starting mode; executing the step 2;

in a small motor starting mode, namely a traditional automobile starting mode;

2) and if the range extender RE has no shutdown fault, the key is opened, no collision signal indication exists, no collision output signal exists, the VCU is started, the range extender controller RCU issues a starting instruction (namely issuing a rotating speed and torque instruction responded by the generator GCU or the engine ECU to execute a starting action) according to the starting mode selected in the step 1, and the engine ECU is started.

When the conditions are all satisfied, the REStartCmd is set to be 1, the state machine in the RCU is switched to a large motor starting state or a small motor starting state from a high-voltage standby mode, a starting instruction is executed (namely a rotating speed and torque instruction which is issued to the GCU and the ECU to respond is issued, and a starting action is executed), if not, the REStartCmd is always 0, and the range extender RE is not started;

3) judging whether the starting is successful;

after the engine ECU reaches the judgment condition of successful starting (such as the rotating speed and the power reach preset values), delaying for a period of time; if the engine ECU also meets the judgment condition of successful starting, the engine ECU enters an idle mode (VCU no-power request) for successful starting, and the VCU has a power request and is switched to a power generation state; otherwise, the range extender controller RCU is stopped and restarted if the starting fails, the restarting starting times are a calibration value, and power failure recovery is required if the restarting starting times exceed the starting times (power failure recovery is required for three-stage failure).

And (3) starting command switching and successful starting judgment strategies: switching and issuing instructions according to the constantly reported rotating speed of the generator engine and the flag bit which is successfully started and reported by the ECU;

example rules for issuing instructions: the method comprises the steps of starting a large motor, controlling a generator to reversely drag the rotating speed of the engine to 1000rpm/min during starting, issuing an ECU (electronic control unit) starting instruction when the rotating speed is 800, controlling the ECU of the engine to inject oil and ignite, reporting a starting success flag bit after the ECU of the engine is successfully started, then entering an idle mode, wherein the rotating speed is default 1000 or 1200rpm/min when the ECU of the engine is in the idle mode, when the ECU of the engine enters a power generation mode, issuing a GCU rotating speed instruction by the RCU, increasing the rotating speed of the motor to a set value, simultaneously issuing an ECU torque instruction.

Engine start state EngStartSts, engine stop state 0; the engine being started state is 1 (motoring state); the rotating speed of the engine is continuously higher than the set starting rotating speed for a plurality of working cycles, and the success of starting is judged to be 2; if the dragging time of the engine is larger than the set value and the engine is not started successfully, the engine is judged to be in a failed starting state, and the state is switched back to 0 (stopped).

Step 2) is realized through a start-stop module, the start-stop module determines the start and stop of a range extender RE according to signals given by a vehicle control unit VCU and a range extender controller RCU:

REStartCmd start-stop instruction judgment logic:

precondition judgment conditions: an AND relationship;

REFaultSts<＝2、RCU_KeyStatus＝＝1、CrashStatus＝＝0、CrashOutputStatus1＝＝0、VCUSts＝＝1、4、5、6、7。

and (3) executing the start-stop command REStartCmd model internal signal and the start mode command of the actual range extender, and executing the start of a large motor or the start of a small motor, namely issuing a rotating speed torque command to the GCU and the ECU to respond, and executing the start action.

The VCU issues a request start mode, i.e., whether the large motor is started or the small motor is started, as shown in table 1:

TABLE 1

Issuing an ECU when starting: the method comprises the steps of requesting torque, starting and starting modes, and supplying oil when an oil cut instruction is 0;

issuing an ECU when the engine is stopped: the torque request, the stop request and the fuel cut instruction are 1, namely fuel cut is carried out;

issuing a GCU instruction:

when the device is started: rotational speed request, target torque, control mode (rotational speed control), operating command (work), operating mode (electric), direction of rotation (reverse)

Step 3) judging whether the starting is successful:

and if the RE starting/stopping pulse signal VCUReCom given by the VCU of the whole vehicle controller is detected to be 1-small motor starting, 2-large motor starting or 3-range-extended power generation, the state is transited to StopToStart, and a corresponding starting mode is executed. If the judgment condition of successful starting is met, then the delay of C _ StartTimeUp is passed, and the judgment condition of successful starting is met, then the Start _ Cmd is true, and the starting flag bit is started; otherwise, Start _ Cmd is false and the Start flag is off.

If the RE Start/stop pulse signal VCUReCom given by the vehicle control unit VCU is detected to be 4 or 5, the state transitions to startstop, if the C _ StartTimeUp delay is passed, VCUReCom still remains to be one of 4 or 5, the Start _ Cmd is false, and the Start flag bit is off; otherwise, Start _ Cmd is true and the Start flag is on.

If the Start _ Cmd is true, starting the range extender, and executing subsequent starting operation;

input variables of the start-stop module comprise an RE start/stop pulse signal given by the VCU, an RE fault state, a key signal detected by the RCU, a state signal of the VCU, a collision signal effective indication and a collision output signal.

VCUReCom: RE start/stop pulse signals given by VCU;

0-no request, 1-small motor starting, 2-large motor starting, 3-range extending power generation, 4-shutdown and 5-active discharge.

REFaultSts: an RE fault condition;

0-no fault, 1-warning fault, 2-reduced power fault, 3-shutdown fault.

RCU _ KeyStatus: the key signal detected by the RCU.

VCUSts: status signals of the VCU, including enable and disable enable:

it is possible to start: 1-low voltage standby, 4-finishing high voltage on the whole vehicle, 5-small motor starting, 6-large motor starting and 7-range-extending power generation;

forbidding starting: reserved, 0-initialized, 2-high voltage power-on, 3-finishing driving high voltage, 8-high voltage power-down and 9-system fault.

CrashStatus: the collision signal effectively indicates:

0-no collision signal indication, 1-collision signal indication.

CrashOutputStatus 1: collision output signal:

0-no collision output signal, 1-collision output signal.

As shown in table 2:

TABLE 2

Inputting variable names	Description of input variables
		VCUReCom	RE Start/stop pulse signal given by VCU
REFaultSts	RE fault status
		RCU_KeyStatus	RCU detected key signal
VCUSts	Status signal of VCU
		CrashStatus	Effective indication of collision signal
CrashOutputStatus	Crash output signal

And the output variable of the start-stop module is an actual start-stop instruction of the range extender. As shown in table 3:

TABLE 3

Output variable names	Description of output variables
		REStartCmd	Actual range extender start-stop command

Finally, it is also noted that the above-mentioned lists merely illustrate a few specific embodiments of the invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.

Claims

1. The multi-mode intelligent starting strategy control method of the range extender is characterized by comprising the following steps: the method comprises the following steps:

1) selecting a starting mode, and executing the step 2;

3) judging whether the starting is successful:

2. The range extender multi-mode intelligent start strategy control method of claim 1, characterized in that:

3. The range extender multi-mode intelligent start strategy control method of claim 2, characterized in that:

4. The range extender multi-mode intelligent start strategy control method of claim 3, characterized in that:

5. The range extender multi-mode intelligent start strategy control method of claim 4, characterized in that:

6. The range extender multi-mode intelligent start strategy control method of claim 5, characterized in that:

7. The range extender multi-mode intelligent start strategy control method of claim 6, characterized in that:

8. The range extender multi-mode intelligent start strategy control method of claim 7, characterized in that:

the start-stop module comprises:

9. The range extender multi-mode intelligent start strategy control method of claim 8, characterized in that:

step 3) judging whether the starting is successful: