Hybrid degraded starting control method

Abstract

The invention discloses a hybrid degraded starting control method, relates to the field of engine starting, and solves the technical problem that a diesel engine cannot be independently started due to hardware problems, incapability of receiving a working request by a VCU (vehicle control unit) and abnormal communication between the VCU and a generator or an ECU (electronic control unit) of a hybrid system of an existing diesel engine. The method comprises the steps that the real-time electric quantity of a battery, the communication state between a VCU and a generator and the communication state between the VCU and an ECU are obtained, and whether an engine can be started independently or not is judged according to the real-time electric quantity of the battery, the communication state between the VCU and the generator and the communication state between the VCU and the ECU. Multi-mode starting is achieved, effective use of the vehicle under different conditions is guaranteed, safe use of the vehicle is effectively guaranteed, safety of a vehicle owner is guaranteed, and excessive hardware transformation and cost increase are not needed.

Description

Technical Field

[0001] The present invention relates to the field of engine starting, and more particularly to a hybrid downgrade starting control method. Background Art

[0002] At present, the hybrid system solution for diesel engines only uses a generator (located at P0 / P1 / P2 position) controlled by a VCU (vehicle control unit) or a generator of an extended-range vehicle as a starter to drive the diesel engine to complete starting. The solution is that the VCU receives the driver's engine start signal. When the battery power is low or the diesel engine is required to provide output power, the VCU sends a start request signal to the ECU (engine control unit) and synchronously controls the generator to drive the diesel engine flywheel to 400-500r / min. The diesel engine determines the current environment and its own status to complete the diesel engine's fuel injection starting operation.

[0003] The current problems with hybrid systems for diesel engines are:

[0004] 1. When there is a problem with the VCU software or hardware, the diesel engine cannot start.

[0005] 2. When the VCU cannot receive the driver's work request, the diesel engine cannot start alone to supply power or provide power to the entire vehicle.

[0006] 3. When the communication between the VCU and the generator is abnormal, the diesel engine cannot start alone to supply power or provide power to the entire vehicle.

[0007] 4. When the communication between VCU and ECU is abnormal, the diesel engine cannot start alone to supply power or provide power to the entire vehicle. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a hybrid downgrade start control method in view of the deficiencies in the prior art, so as to solve the technical problem that the diesel engine cannot be started alone due to hardware problems, VCU cannot receive work requests, and abnormal communication between VCU and generator or ECU.

[0009] A hybrid downgrade start control method described in the present invention obtains the real-time power of the battery, the communication status between the VCU and the generator, and the communication status between the VCU and the ECU, and determines whether the engine can be started alone according to the real-time power of the battery, the communication status between the VCU and the generator, and the communication status between the VCU and the ECU; when it is determined that the engine cannot be started alone, a start mode is selected according to the real-time power of the battery, the communication status between the VCU and the generator, and the communication status between the VCU and the ECU to start the engine.

[0010] As a further improvement, the startup mode includes a power feeding mode, a first communication failure mode and a second communication failure mode;

[0011] When the real-time power level of the battery is less than a preset battery power warning value, it is determined that the engine cannot be started alone, and the power feeding mode is selected;

[0012] When the communication between the VCU and the generator is abnormal, it is determined that the engine cannot be started alone, and the first communication failure mode is selected;

[0013] When the communication between the VCU and the ECU is abnormal, it is determined that the engine cannot be started alone, and the second communication failure mode is selected.

[0014] Further, when the starting mode is the feeding mode, a starting request signal is received by the VCU, the VCU inputs a starting signal to the ECU, and the ECU controls the engine to start to an idle state;

[0015] When the starting mode is the first communication failure mode, a starting request signal is received through the VCU, the VCU inputs a starting signal to the ECU, and the ECU controls the engine to start to an idle state;

[0016] When the starting mode is the second communication failure mode, a receiving time is set. When the ECU starts to receive the starting request signal, the receiving time starts to count; when the receiving time count ends and the ECU still does not receive the starting request signal, the ECU controls the engine to start to the idle state.

[0017] Furthermore, the starting mode also includes a normal mode. When the real-time power level of the battery is greater than or equal to the battery power warning value and the communication between the VCU and the generator is normal and the communication between the VCU and the ECU is normal, it is determined that the engine can be started alone and the normal mode is selected.

[0018] Furthermore, when the starting mode is the normal mode, the starting request signal is received by the VCU, and the generator is used to reverse the engine speed to a preset speed range. At the same time, the VCU inputs a starting signal to the ECU, and the ECU controls the engine to start to an idle state.

[0019] Furthermore, the speed range is 200r / min-500r / min.

[0020] Furthermore, the method for obtaining the communication status between the VCU and the generator is that when the level of the control signal received by the generator is consistent with the level of the first control signal output by the VCU, the communication status between the VCU and the generator is normal; when the level of the control signal of the generator is inconsistent with the level of the first control signal output by the VCU, the communication status between the VCU and the generator is abnormal.

[0021] Furthermore, the method for obtaining the communication status between the VCU and the ECU is that when the level of the control signal input by the ECU and the level of the second control signal output by the VCU are consistent, it is judged that the communication status between the VCU and the generator is normal; when the level of the input signal of the ECU and the level of the second control signal output by the VCU are inconsistent, it is judged that the communication status between the VCU and the generator is abnormal.

[0022] Beneficial Effects

[0023] The advantages of the present invention are:

[0024] The present invention obtains the real-time power level of the battery, the communication status between the VCU and the generator, and the communication status between the VCU and the ECU, and determines whether the engine can be started alone according to the real-time power level of the battery, the communication status between the VCU and the generator, and the communication status between the VCU and the ECU; when it is determined that the engine cannot be started alone, a starting mode is selected to start the engine according to the real-time power level of the battery, the communication status between the VCU and the generator, and the communication status between the VCU and the ECU, thereby achieving multi-mode starting, ensuring effective use of the vehicle in different situations, effectively ensuring the safe use of the vehicle, and ensuring the safety of the owner, without adding excessive hardware modifications and cost increases. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the hybrid downgrade starting system of the present invention.

[0026] Among them: 1-VCU, 2-generator, 3-battery, 4-starter, 5-engine, 6-ECU. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0028] See also Figure 1A hybrid downgrade start control method of the present invention includes obtaining a real-time power level of a battery 3, a communication status between a VCU1 and a generator 2, and a communication status between a VCU1 and an ECU 6, and judging whether an engine 5 can be started independently according to the real-time power level of the battery 3, the communication status between a VCU1 and a generator 2, and the communication status between a VCU1 and an ECU 6; when it is judged that the engine 5 cannot be started independently, selecting a start mode according to the real-time power level of the battery 3, the communication status between a VCU1 and a generator 2, and the communication status between a VCU1 and an ECU 6 to start the engine 5.

[0029] The startup mode includes a normal mode, a feeding mode, a first communication failure mode, and a second communication failure mode.

[0030] When the real-time power of battery 3 is greater than or equal to the battery power warning value and the communication between VCU1 and generator 2 and between VCU1 and ECU6 is normal, it is determined that engine 5 can be started alone and the normal mode is selected. In the normal mode, the entire system does not have any hardware failure that affects the start. At this time, the driver's start request is accepted through VCU1. VCU1 determines that the current vehicle state allows starting, uses generator 2 to reverse the diesel engine to 350r / min, and sends a start signal to ECU6. After ECU6 receives the start signal from VCU1 and determines that the diesel engine synchronization signal is realized, it realizes the control of starting engine 5 to idle speed by injecting diesel.

[0031] When the real-time power of battery 3 is less than the preset battery power warning value, it is determined that engine 5 cannot be started alone, and the feeding mode is selected. In the feeding mode, there is no hardware failure that affects the starting of the entire system. VCU1 recognizes that the power (SOC) of battery 3 is too low and cannot guarantee that the diesel engine can be effectively reversed. At this time, the driver's starting request is accepted through VCU1. VCU1 determines that the current vehicle status allows starting. ECU6 receives the starting signal of VCU1 and determines that the status of the diesel engine backup starting system allows starting. ECU6 controls the starting relay to control the starter 4 to drag the diesel engine. After determining that the diesel engine synchronization signal is realized, the control of starting the engine 5 to idle speed is realized by injecting diesel.

[0032] When the communication between VCU1 and generator 2 is abnormal, it is determined that the engine 5 cannot be started alone, and the first communication fault mode is selected. The first communication fault mode - the communication between VCU1 and generator 2 is abnormal, and it cannot be guaranteed that the diesel engine can be effectively reversed. At this time, the driver's start request is accepted by VCU1, and VCU1 determines that the current vehicle status allows starting. ECU6 receives the start signal from VCU1 and determines that the status of the diesel engine backup starting system allows starting. ECU6 controls the start relay to control the starter 4 to drag the diesel engine. After determining that the diesel engine synchronization signal is realized, the control of starting the engine 5 to idle speed is realized by injecting diesel.

[0033] When the communication between VCU1 and ECU6 is abnormal, it is determined that the engine 5 cannot be started alone, and the second communication fault mode is selected. The second communication fault mode - the communication between VCU1 and ECU6 is abnormal, and it cannot be guaranteed that the diesel engine can be effectively reversed. At this time, after ECU6 receives the driver's start request signal for more than a certain period of time, ECU6 determines that the diesel engine backup start system state allows starting. ECU6 controls the start relay to control the starter 4 to drag the diesel engine. After determining that the diesel engine synchronization signal is realized, the control of starting the engine 5 to idle speed is realized by injecting diesel.

[0034] The method for obtaining the communication status between VCU1 and generator 2 is that when the level of the control signal received by generator 2 is consistent with the level of the first control signal output by VCU1, the communication status between VCU1 and generator 2 is normal; when the level of the control signal of generator 2 is inconsistent with the level of the first control signal output by VCU1, the communication status between VCU1 and generator 2 is abnormal.

[0035] The method for obtaining the communication status between VCU1 and ECU6 is that when the level of the control signal input to ECU6 and the level of the second control signal output by VCU1 are consistent, it is judged that the communication status between VCU1 and the generator 2 is normal; when the level of the input signal of ECU6 and the level of the second control signal output by VCU1 are inconsistent, it is judged that the communication status between VCU1 and the generator 2 is abnormal.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A hybrid downgrade start control method, characterized in that: The method comprises obtaining the real-time power level of a battery (3), the communication status between a VCU (1) and a generator (2), and the communication status between the VCU (1) and an ECU (6); judging whether an engine (5) can be started independently according to the real-time power level of the battery (3), the communication status between the VCU (1) and the generator (2), and the communication status between the VCU (1) and the ECU (6); and when it is judged that the engine (5) cannot be started independently, selecting a starting mode according to the real-time power level of the battery (3), the communication status between the VCU (1) and the generator (2), and the communication status between the VCU (1) and the ECU (6) to start the engine (5).

2. A hybrid downgrade start control method according to claim 1, characterized in that: The startup mode includes a power feeding mode, a first communication failure mode and a second communication failure mode; When the real-time power level of the battery (3) is less than a preset battery power warning value, it is determined that the engine (5) cannot be started alone, and the power feeding mode is selected; When the communication between the VCU (1) and the generator (2) is abnormal, it is determined that the engine (5) cannot be started alone, and the first communication failure mode is selected; When the communication between the VCU (1) and the ECU (6) is abnormal, it is determined that the engine (5) cannot be started independently, and the second communication failure mode is selected.

3. The hybrid downgrade start control method according to claim 2, characterized in that: When the starting mode is the power feeding mode, a starting request signal is received by the VCU (1), the VCU (1) inputs a starting signal to the ECU (6), and the ECU (6) controls the engine (5) to start to an idle state; When the starting mode is the first communication failure mode, a starting request signal is received by the VCU (1), the VCU (1) inputs a starting signal to the ECU (6), and the ECU (6) controls the engine (5) to start to an idle state; When the starting mode is the second communication failure mode, a receiving time is set, and when the ECU (6) starts to receive the starting request signal, the receiving time starts to count; when the receiving time count ends and the ECU (6) still does not receive the starting request signal, the ECU (6) controls the engine (5) to start to an idle state.

4. The hybrid downgrade start control method according to claim 1, characterized in that: The starting mode also includes a normal mode. When the real-time power level of the battery (3) is greater than or equal to the battery power warning value and the communication between the VCU (1) and the generator (2) is normal and the communication between the VCU (1) and the ECU (6) is normal, it is determined that the engine (5) can be started alone and the normal mode is selected.

5. The hybrid downgrade start control method according to claim 4, characterized in that: When the starting mode is the normal mode, the VCU (1) receives a starting request signal, and uses the generator (2) to reverse the speed of the engine (5) to a preset speed range. At the same time, the VCU (1) inputs a starting signal to the ECU (6), and the ECU (6) controls the engine (5) to start to an idle state.

6. The hybrid downgrade start control method according to claim 5, characterized in that: The speed range is 200r / min-500r / min.

7. The hybrid downgrade start control method according to claim 1, characterized in that: The method for obtaining the communication status between the VCU (1) and the generator (2) is as follows: when the level of the control signal received by the generator (2) is consistent with the level of the first control signal output by the VCU (1), the communication status between the VCU (1) and the generator (2) is normal; when the level of the control signal of the generator (2) is inconsistent with the level of the first control signal output by the VCU (1), the communication status between the VCU (1) and the generator (2) is abnormal.

8. The hybrid downgrade start control method according to claim 1, characterized in that: The method for obtaining the communication status between the VCU (1) and the ECU (6) is as follows: when the level of the control signal input by the ECU (6) and the level of the second control signal output by the VCU (1) are consistent, it is determined that the communication status between the VCU (1) and the generator (2) is normal; when the level of the input signal of the ECU (6) and the level of the second control signal output by the VCU (1) are inconsistent, it is determined that the communication status between the VCU (1) and the generator (2) is abnormal.

Images