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Continuous fuel cut-off control method for hybrid electric vehicle

A hybrid vehicle and control method technology, applied in hybrid vehicles, motor vehicles, transportation and packaging, etc., can solve the problems of slow deceleration, low system efficiency, etc., to reduce noise, improve the efficiency of reducing vehicle speed, and improve driving comfort. sexual effect

Active Publication Date: 2019-01-01
江西鼎盛新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a continuous fuel cut control method for hybrid electric vehicles that can reduce the probability of vehicle shaking and solve the problems of slow deceleration and low system efficiency when the accelerator pedal is released

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A continuous fuel cut control method for hybrid electric vehicles. The EMS transmits the collected fuel cut information, the current actual output torque of the engine and the engine water temperature to the HCU. The HCU comprehensively judges whether the preliminary continuous fuel cut demand is Established, if the preliminary continuous oil cut demand is established, then the HCU sets the engine fuel cut demand torque according to the current actual engine output torque and sends it to the EMS for execution, until the actual engine output torque is less than or equal to 10Nm, the engine fuel cut demand The torque is set to 0. At this time, the EMS controls the engine to cut off the fuel according to the agreed fuel cut control strategy. The HCU judges whether the engine has cut off the fuel according to the information fed back by the EMS. The fuel cut-off command is sent to the EMS, and the EMS controls the engine to be in a continuous fuel cut-off state until the HCU...

Embodiment 2

[0032] A method for controlling the continuous fuel cutoff of a hybrid electric vehicle, the specific control method is similar to the method for controlling the continuous fuel cutoff of the hybrid electric vehicle in Embodiment 1, the difference is that the value of C is 25Nm, the value of E is 13Nm, The value of D is 4Nm, the value of A is 35km / h, the value of B is 800rpm, and the value of S is 750rpm.

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PUM

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Abstract

The invention provides a continuous fuel cut-off control method for a hybrid electric vehicle. An EMS transmits acquired fuel cut-off information, an actual output torque of the current engine and the engine cooling fluid temperature to an HCU; the HCU judges whether a primary continuous fuel cut-off requirement is true or not according to a gear position, a vehicle driving mode and a vehicle speed; if the primary continuous fuel cut-off requirement is true, the HCU sets an engine fuel cut-off requirement torque according to the actual output torque of the current engine and sends the torque to the EMS for execution, and sets the engine fuel cut-off requirement torque to be 0 when the actual output torque of the engine is less than or equal to E, and at the moment, the EMS controls fuel cut-off of the engine according to a set fuel cut-off control strategy; the HCU judges whether the fuel to the engine is cut off according to information fed by the EMS; if the fuel is cut off, the HCU triggers an HCU continuous fuel cut-off function and sends a continuous fuel cut-off instruction to the EMS; and the EMS controls the engine to be in a continuous fuel cut-off state until the HCU judges that the primary continuous fuel cut-off requirement is not true. The method provided by the invention can reduce the possibility of shaking of the vehicle and improve the driving comfort.

Description

technical field [0001] The invention relates to a method for controlling the continuous fuel cutoff of a vehicle, in particular to a method for controlling the continuous fuel cutoff of a hybrid electric vehicle, which is applicable to any hybrid electric vehicle that can use non-engine power to adjust the engine speed. Background technique [0002] At present, almost all traditional EFI vehicles have the function of deceleration fuel cutoff / recovery fuel supply, that is, at a certain speed, when the driver releases the accelerator pedal and coasts with gears, if the engine speed is higher than a certain set value, the EMS controls the engine Cut off the fuel supply. At this time, the engine is in the reverse dragging condition. The existence of vehicle inertia prevents the engine speed from dropping rapidly due to fuel cut-off. When the engine speed drops to another lower set value, the EMS controls the engine to resume supply. oil, to avoid the phenomenon of the engine sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W10/06B60W20/40
CPCB60W10/06B60W20/40B60W2510/0676B60W2510/242B60W2510/244B60W2520/00B60W2520/10B60W2710/06B60W2710/0666
Inventor 王博钟发平王晨于海生张彤易显科
Owner 江西鼎盛新材料科技有限公司