You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: An Overview of Fault-Diagnosis and Fault-Tolerance Techniques for Switched Reluctance Machine Systems 
Chapter Title:  C. TRIAL AND ERROR METHOD 
1. Abstract of Cited Paper (BIB001):  This paper presents a comprehensive method for eccentricity fault diagnosis in switched reluctance machine (SRM) during offline and standstill modes. In this method, the fault signature is achieved by processing the differential currents resulted from injected high-frequency diagnostic pulses to the motor windings. For feasibility assessment of the proposed method, the correlation between differential current and eccentricity occurrence is analytically demonstrated. A 3-D transient finite-element method is utilized to analyze the proposal, and its results are validated by experimental tests on a prototype machine in the laboratory. According to the obtained results by experimental as well as numerical analysis, a pattern is introduced in order to detect fault presence. In this stage, an algorithm with two methods is proposed for the detection of fault location or faulty phase. Furthermore, the direction of fault is recognized by a simple comparative technique. Next, a normalized indicator is proposed in order to estimate the eccentricity fault severity as well as its occurrence. This indicator is not dependent of the healthy motor information, which makes it reliable and applicable tool for all sizes of SRMs. Finally, a simple procedure based on achieved pattern and indicator is implemented to distinguish the static, dynamic, and mixed eccentricity in the SRM.

Literature Review:
In order to achieve a real-time fault diagnosis, the trial and error (TE) method can be employed due to simple and practical features. In BIB001 , a comprehensive fault location technique is proposed to identify the fault component after detecting the fault. If the open-circuit fault is detected, the controller compels the upper switch to turn on and the lower switch to turn off. The demagnetization time is obtained for distinguishing which switch has open-circuit fault. Similarly, once the shortcircuit fault is found, both switches in the affected phase are turned off to decrease the current. subsequently, the upper switch is turned on to test which switch is short-circuited. If the upper one is short-circuited, the phase current will increase rapidly. Otherwise, the current keeps zero, which means the short-circuit fault occurs in the lower switch. The TE method based fault diagnosis procedure for the determination of open-and short-circuit faults is exhibited in Fig. 13 . TE method can also be used for eccentricity fault detection BIB002 . For the three-phase SRM, two high frequency (HF) test signals are injected into two separated coils of phase A respectively when phase A is at the aligned position. Then the HF signals are injected into phase B and phase C in the same way. All the coil currents are measured. The amplitudes of differential currents of separated coils in one phase are recorded for comparison. The differential currents are sensitive to air gap variation, which is quite effective to detect the degree of rotor eccentricity fault.