# Control Strategy of Torque Distribution for Hybrid Four-Wheel Drive Tractor

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## Abstract

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## 1. Introduction

## 2. Hybrid Four-Wheel Drive Tractor Working Condition Analysis

## 3. Hybrid Four-Wheel Drive Tractor Model Analysis

#### 3.1. Hybrid Four-Wheel Drive Tractor Drive System Model Analysis

#### 3.2. Power System Matching Design

#### 3.2.1. Determination of Rated Tractive Force

#### 3.2.2. Power System Matching Design

#### 3.2.3. Torque Coupler Design

## 4. Torque Distribution Control Strategy for Hybrid Four-Wheel Drive Tractor

#### 4.1. Front- and Rear-Drive Wheel Torque Distribution Control Strategy

#### 4.1.1. Affiliation Function Design

#### 4.1.2. Fuzzy Rules Design

#### 4.2. Control Strategy for Torque Distribution of Rear-Drive System

#### 4.2.1. Affiliation Function Design

#### 4.2.2. Fuzzy Rules Design

## 5. Comparative Analysis

## 6. Conclusions

## Author Contributions

## Funding

## Data Availability Statement

## Conflicts of Interest

## References

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**Figure 3.**Control strategy for torque distribution of front- and rear-drive wheels based on fuzzy control.

**Figure 4.**Control strategy for torque distribution of front- and rear-drive wheels based on fixed ratio distribution.

k | Plowing Resistance | |||||
---|---|---|---|---|---|---|

Road resistance coefficient | NB | NM | Z | PM | PB | |

NH | ND | ND | ND | NB | NM | |

NL | ND | NB | NM | NS | Z | |

Z | NM | NS | Z | PS | PM | |

PL | Z | PS | PM | PB | PD | |

PH | PS | PM | PB | PD | PD |

λ | Desired Torque | |||||
---|---|---|---|---|---|---|

SOC | NB | NM | Z | PM | PB | |

NH | TS | TS | S | S | M | |

NL | TS | S | S | M | M | |

Z | S | S | M | B | B | |

PL | TB | B | B | M | B | |

PH | TB | TB | B | M | B |

Project | Parameter | Value |
---|---|---|

Vehicle | Quality/kg | 7350 |

Wheel base/mm | 2800 | |

Engine | Rated power/kw | 85 |

Rated speed/(r/min) | 2300 | |

Front motor | Rated power/kw | 45 |

Rated speed/(r/min) | 2500 | |

Rear motor | Rated power/kw | 45 |

Rated speed/(r/min) | 2500 | |

Gearbox | 4th gear transmission ratio | 3.6 |

Front final reduction drive | transmission ratio | 5.5 |

Rear final reduction drive | transmission ratio | 5.0 |

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## Share and Cite

**MDPI and ACS Style**

Yan, X.; Zhang, H.; Li, X.; Li, Y.; Xu, L.
Control Strategy of Torque Distribution for Hybrid Four-Wheel Drive Tractor. *World Electr. Veh. J.* **2023**, *14*, 190.
https://doi.org/10.3390/wevj14070190

**AMA Style**

Yan X, Zhang H, Li X, Li Y, Xu L.
Control Strategy of Torque Distribution for Hybrid Four-Wheel Drive Tractor. *World Electric Vehicle Journal*. 2023; 14(7):190.
https://doi.org/10.3390/wevj14070190

**Chicago/Turabian Style**

Yan, Xianghai, Hui Zhang, Xianzhe Li, Yanying Li, and Liyou Xu.
2023. "Control Strategy of Torque Distribution for Hybrid Four-Wheel Drive Tractor" *World Electric Vehicle Journal* 14, no. 7: 190.
https://doi.org/10.3390/wevj14070190